Efficient, Safe and Sustainable Traffic at Sea

Transcription

1 Ttle Acroym Effcet, Safe ad Sustaable Traffc at Sea EffceSea Documet No. D_WP4_4_4 Documet Access: Publc Desg ad deploymet of a AtoN remote motorg cetre ad IT frastructure for provdg e-navgato servce Cotract No. 013 Part-faced by the Europea Uo (Europea Regoal Developmet Fud ad Europea Neghbourhood ad Partershp Istrumet) effcesea.org 1 Part-faced by the Europea Uo

2 DOCUMENT STATUS Authors Name Leo Käärma Avar Usk Alar Lepp Tt Pkpoom Revewers Name Kasu Hekoe? Orgasato Estoa Martme Admstrato Cyberetca AS Cyberetca AS Cyberetca AS Orgasato FMA? Approval of report Name Orgasato Sgature Date Thomas Chrstese DaMSA Documet Hstory Revso Date Orgasato Itals Revsed pages Short descrpto of chages effcesea.org Part-faced by the Europea Uo

3 effcesea.org 3 Part-faced by the Europea Uo

4 Cotets 1. AtoN Remote Motorg Itroducto Remote AtoN Ste Equpmet Motorg Cetre Cofgurato Hadlg of Motorg Data Sythetc AIS AtoN Reports Geerated by the AtoN Remote Motorg System Commucatos, Postog ad Measuremet Module ekta Telfco E96X for AtoN Itegrato to e-navgato Ifrastructure Telfco: a Telematcs Feld Cotroller for AtoN Motorg Oboard Buoy Heel Agle Calculato ad Statstcs Fuctoalty The Buoy Heel Agle Calculato Algorthm Itroducto Mathematcal Backgroud Agle Calculato Dyamc Evromet Algorthm Realzato Telfco Frmware Averagg Algorthm Implemetato Telfco Decodg of Agle Data o the Server Sde Crtcal Heel Agle Warg Fuctoalty Accelerato Measuremet ad Ole Trasmsso Fuctoalty Descrpto of the Data Acqusto Algorthm AtoN remote motorg cetre software GPRS Keskus for provso of e-navgato servce frastructure elemets Itroducto to the GPRS RCMC Recepto ad Hadlg of Status ad Warg Messages from AtoN Stes Recepto ad Hadlg of Navgato-Related Messages from AtoN Stes Trascodg of Sythetc AtoN AIS Messages Recepto ad Hadlg of Crtcal Heel Agle Warg Messages from AtoN Stes Recepto ad Hadlg of Collso Warg Messages from AtoN Stes Recepto ad Hadlg of Average Heel Agle Data from AtoN Stes Recepto ad Hadlg of Accelerato Data from AtoN Stes Estmato of AtoN Performace ad Aalyss of Servce Avalablty Web-Based Iterface for Isttutoal ad Publc Access Itegrato wth Legacy ad Exteral Systems AIS Ifrastructure Used for AtoN Status Report ad Safety Related Message Broadcast AIS Message Routg ad Broadcastg AIS Chael Load Produced by Sythetc AIS AtoN Messages... 8 effcesea.org 4 Part-faced by the Europea Uo

5 1. AtoN Remote Motorg 1.1 Itroducto Due to the hgh avalablty requremets mposed o provso of lght sgallg servce wth the mare avgato safety frastructure, the resposble authortes eed cotuous awareess of the status of equpmet operatg at the lghted vsual ad to avgato (AtoN) stes to be able to guaratee tmely repars ad codto based prevetve mateace. Based o avgatoal rsk assessmet to determe crtcal AtoN stes, a typcal soluto for matag adequate AtoN state ad techcal (egeerg) stuato awareess at the operatos cetre s mplemetg a remote cotrol ad motorg system (RCMS) of AtoN ste equpmet usg wreless techologes avalable the rego, ofte utlzg publc cellular etworks (GSM) for trasmsso of formato from the felded systems to a remote cotrol ad motorg cetre (RCMC). Cyberetca AS has set the goal of developg such soluto further to brg added value to the classcal AtoN remote motorg, utlzg the equpmet, the motorg cetre software compoets ad the commucato lks establshed for trasmsso of scarce state reports ad expectedly rare falure alarms for troducg the e-navgato servce elemets for provso of mproved stuato awareess both to the authortes resposble for AtoN operato, ad to the marers: forwardg of status messages receved from avgatoal buoys to the Automatc Idetfcato System (AIS) etwork for broadcastg as Motored Sythetc AIS AtoN reports, gatherg buoy heel agle formato for more sophstcated vsblty rage aalyss, ad eve estmatg the sea states the future. The Cyberetca soluto s based o applcato of GPS-capable ekta Telematcs Feld Cotroller (TelFCo or smply Telfco) uts employg GSM/GPRS based commucato that provde acceptable avalablty ad latecy (trasfer delay) levels, feedg the formato from remote stes (AtoN outstatos) to a sgle motorg cetre over the publc etworks utlzg the relable TCP/IP protocol. At the motorg cetre, several software compoets are at work o the receved data to provde decodg, aalyss, loggg, servg the formatoal cotet to authorzed users, ad forwardg t to other etworks as ecessary. Recordg of all the relevat formato a AtoN database ad creatg systematc stuato reports helps to keep track of the evets potetally leadg to falures, to avod cofgurato errors, ad to perform AtoN mateace most effcet way. Whle the orgal tet of creatg such RCMS was to develop a formato system extedg beyod the mere evet status recordg tasks whe t was started over fftee years ago, oly the developmets sesor ad commucatos techologes, etworks, ad costs have made such more sophstcated systems feasble. Ths documet provdes a overvew of the prcples, equpmet ad software used to acheve the set goal. 1. Remote AtoN Ste Equpmet The AtoN stes are ftted wth avgato lghts for provso of the prmary fuctoalty of AtoN servce to the marers, cotrolled by ether a sgle or duplcated (redudat) flasher ut ad powered ether by prmary batteres, solar, wd or utlty power combato wth rechargeable batteres ad correspodg regulator/chargers. A optoal motorg, postog ad commucatos module typcally employed for system health ad performace motorg at crtcal AtoN stes s tasked wth checkg AtoN operato, tegrty, posto, ad techcal state. It tates a commucatos sesso wth the remote motorg cetre to sed a system status message at regular reportg tervals, or a error/warg message upo detecto of ether ay motored parameter exceedg a set threshold for measuremets drectly performed by the motorg module, or a posto outsde the allowed area case of GPS posto motorg effcesea.org 5 Part-faced by the Europea Uo

6 actvated. It also terfaces the ste local area etwork (LAN) to the remote motorg cetre, forwardg the error ad warg messages orgatg from ste equpmet to the cetre. Fgure 1. AtoN ste equpmet: a LED later, a flasher, a Telfco E96, ad a ce buoy later E891 tegratg the same Telfco ad flasher board wth a LED array ad GSM/GPS atea. Due to the fact that sgfcat part of Estoa waters s located oly about 7º south of the Arctc Crcle, evrometal codtos durg the wter ca be rather harsh, wth occasoal sold ce formato o farways ad ar temperatures fallg below -5ºC. Sce passeger ad cargo traffc wth eghbourg coutres ad the Estoa slads (partly replaced by settg up ce brdges for road vehcles whe possble) s upheld eve durg the wter, requremets to relablty ad power effcecy of AtoN equpmet used are hgh. Amout of solar radato that could be obtaed from tegrated photovoltac paels o buoys s ot suffcet for most of the avgato seaso; therefore prmary batteres are used to power floatg AtoN systems, resultg strct lmtatos to the power cosumpto of the oboard equpmet. A good example of a robust but capable floatg AtoN system s a ce buoy later E891 maufactured by Cyberetca, provdg motorg ad sythetc AIS AtoN operato wth GPS posto motorg typcal cofguratos (AIS M1 every 3 m) at 7.Wh per day spet for commucatos; lght sgallg doubles or trples the eergy cosumpto depedg o the omal rage ad flashg character used. I ths paper, maly floatg AtoN stes that are remotely motored usg a Telfco ut (curretly, model umbers E961 ad E96) are dscussed. Motorg ad measuremet msso parameters of a Telfco are descrbed detal paragraph. 1.3 Motorg Cetre Cofgurato The Remote Cotrol ad Motorg Cetre mplemetato developed at Cyberetca s documeted uder product umber E75. It cossts of several hardware ad software cofgurato tems: A dedcated server computer based o X86 hardware ad rug a Deba GNU/Lux operatg system A motorg frot ed software compoet for commucato wth remote AtoN stes, formattg ad forwardg of pre-formatted sythetc AIS AtoN reports: PaSS (requres a Su Java Rutme Evromet (JRE), ver. 6 or hgher) A PostgreSQL based database applcato for storg AtoN ad evet formato: GAB effcesea.org 6 Part-faced by the Europea Uo

7 A Apache based web server applcato provdg ole access to AtoN motorg ad cofgurato formato by Iteret browser software: GVL Software compoets for data aalyss, alarm geerato, reportg, terfacg, RCMC health motorg ad dagostcs, etc The software has bee desged to eable mplemetato of a redudat server cofgurato the future. Aother software compoet that may be located outsde the RCMS server but logcally belogs to the e- Navgato servce frastructure s the Cyberetca AIS Router. It s operatg close to the AIS server segmet, recevg the cotets of sythetc AIS AtoN reports from PaSS, falzg the formattg of these to proper AIS AtoN messages, ad routg the results to the relevat AIS base statos. 1.4 Hadlg of Motorg Data I a tradtoal AtoN remote motorg applcato, the cetral stato (system server) ether polls the remote statos regularly, or wats for the remote statos (clets) to tate the commucatos. I case of usg the cost effectve GSM/GPRS based coectoless TCP/IP commucatos, typcally oly a remote AtoN ste (a Telfco) ca tate a commucatos sesso wth the motorg cetre server due to the specfcs of the GSM servce provder etwork. Should a eed arse for commucatg wth a remote ste earler tha the ext scheduled reportg tme, a followg feature s foresee: t s possble to force a Telfco to tatg a commucatos sesso wth the motorg cetre server by smply callg ts GSM phoe umber. Whle the ma fucto of the Cyberetca AtoN RCMC s stll watg for regular status, posto ad error reports, the scope of formato avalable from a Telfco exteds beyod smple system status motorg. Data receved from the Telfco uts stalled at remote AtoN stes belogs to oe of the four categores below, ad s subject to correspodg hadlg by the server software compoet PaSS: A. Messages wth avgato safety crtcal cotet: AtoN ste equpmet falure/error or warg messages, Buoy off stato, Crtcal heel agle, collso alert, sythetc AIS AtoN status report these messages receve prorty treatmet ad result mmedate alarm geerato or forwardg. All such messages are tme stamped by Telfco ad saved to the database upo recept, wth the excepto of regular status reports from the buoys that are subject to sythetc AIS AtoN reportg. B. Operatoal status formato: regular status reports at pre-cofgured tme terval from AtoN stes other tha the buoys subject to sythetc AIS AtoN reportg, cotag power supply voltage, temperature, GSM feld stregth, coordates, flasher status report, etc. These messages are saved to the database whe certa cofgurato codtos are met (sgfcat status chages, etc), ad used as put formato for daly automated stuato reports. C. Iformato requested from a Telfco by the RCMC durg a commucatos sesso: status reports from ad cofgurato settgs of the AtoN ste equpmet coected to a Telfco over the RS485 terface based LAN, parameters ot cluded regular status reports (heel agle ad commucatos statstcs), etc. Ths formato s saved to correspodg locatos of the database. D. Accelerato measuremet formato: ths formato s curretly saved bary fles for further processg by exteral applcatos, formatted accordg to Cyberetca covetos. Evaluato of feasblty of developg a applcato for ole sea state estmato s a work uder progress. effcesea.org 7 Part-faced by the Europea Uo

8 Requestg addtoal formato from a Telfco s accomplshed by creatg a correspodg commucatos scearo for a specfc AtoN ste by the meas of the RCMC software. Oce the Telfco tates a commucatos sesso, t dscovers ad executes the created scearo, uploadg requested formato ad dowloadg ew settgs whe structed so. Iformato exchage betwee a Telfco ad the RCMC s dscussed more detal secto. 1.5 Sythetc AIS AtoN Reports Geerated by the AtoN Remote Motorg System Wth the support bult to the shore sde formato processg ad trasmsso frastructure, the Telfco modules stalled o avgatoal buoys ca be used as status data sources for broadcastg of sythetc AIS AtoN messages by the meas of the AIS shore etwork. I addto to cost savgs both o hardware ad o eergy for power suppled, ths kd of arragemet offers beefts to the resposble authortes by eablg full cotrol over the AIS AtoN broadcastg: t ca be cofgured ole wth ease, eabled/dsabled dvdually, or lmted to broadcastg of off stato/falure messages. Sythetc AIS AtoN fuctoalty of Cyberetca AtoN motorg soluto s descrbed Sectos ad 4.. Commucatos, Postog ad Measuremet Module ekta Telfco E96X for AtoN Itegrato to e-navgato Ifrastructure.1 Telfco: a Telematcs Feld Cotroller for AtoN Motorg The E96X Telfco products are desged ad maufactured at Cyberetca AS specfcally for AtoN remote motorg applcatos, sharg commo software/hardware archtecture wth smlar products desged for e-polce ad ralway applcatos. A Telfco ut tegrates a programmable 8-bt mcrocotroller wth a stadard GPS recever, a GSM/GPRS modem ad a sold state 3-axal accelerato sesor o the crcut board level. Wth the frmware talored to operate at lowest achevable power cosumpto levels, t s resposble for mplemetg GPS postog, tme sychrozato, commucato ad measuremet fuctos at the remote AtoN stes, allowg lmted cotrol of AtoN msso parameters from the motorg cetre over publc GSM-900/1800 GPRS based packet swtchg TCP/IP etworks. I case of ekta brad of LED buoy laters maufactured by Cyberetca AS, the Telfco ut s typcally mechacally tegrated wth the later. It s ftted wth a RS485 terface for wrg together a local area etwork of up to 16 equpmet uts stalled at the remote AtoN ste (redudat flashers ad power supples, etc) that ca utlze the propretary A-Bus protocol used by ekta AtoN products, creatg a gateway for these devces to the RCMC for sedg alarms, motorg, frmware re-cofgurato ad updatg. A Telfco s typcally cofgured at the factory for the AtoN motorg msso accordace wth user requremets. It ca later be re-cofgured ether usg a persoal computer equpped wth the mateace software Laserv+ ad a sutable terface adapter module (E815), or over the ar from the RCMC server software. Furthermore, sce the ed of the year 009 ad frmware verso.0, the Telfco product features Frmware-Over-The-Ar (FOTA) capablty allowg replacg the whole frmware of a felded Telfco ut from the RCMC to mprove or chage the fuctoalty wth the lmtatos of the hardware. Ths remarkable feature brgs sgfcat cost effcecy ad reduced evrometal footprt to AtoN motorg system operato, cosderg mult-seasoal buoys ad costly vsts of a 60m buoy teder wth fuel cosumpto of 00 l/h to 500 l/h (up to EUR 500 per hour for fuel costs oly) that were ecessary for retreval of the buoy for re-programmg beyod the capablty offered by the RCMC the past. The method used for trasfer ad actvato of ew frmware s appled error tolerat way, guarateeg that the Telfco wll ot be redered operable or commece erroeous operato ether after a usuccessful remote update, or case of ulkely trasmsso errors, always resumg operato wth a prevous frmware verso case whe the tegrty checkg of receved ew frmware verso fals. effcesea.org 8 Part-faced by the Europea Uo

9 A Telfco ca be cofgured for operato at the remote AtoN ste wth oe of the followg msso profles: A. Stadard AtoN motorg (ether fxed or floatg) B. Stadard AtoN motorg (ether fxed or floatg) wth sythetc AIS AtoN reports C. Floatg AtoN motorg wth collso detecto D. Floatg AtoN motorg wth heel agle statstcs ad crtcal heel agle detecto E. Floatg AtoN motorg wth accelerato measuremet ad trasmsso These profles are ot strct or meu-selectable; they are provded here for gudace ad ca actually be appled almost ay combato by correspodg RCMC software settgs. The oly profle ot recommeded for mxg wth sythetc AIS AtoN reportg s the accelerato measuremet. The oly dfferece betwee profles A ad B s the reportg frequecy, wth AIS reports beg set to the RCMC at fxed tme tervals, dow to oce every 60 secods whe ecessary, whle case of stadard AtoN motorg as few as oly two regular evet trggered messages may be set to the RCMC per day ( Lght o ad Lght off, geerated by a flasher module as a result of ambet lght measuremet). I case of ay msso profle, a Telfco performs the followg repettve tasks at a pre-cofgured tme terval to check the system tegrty ad to dscover potetal malfuctos or devatos: Pollg the AtoN equpmet coected to the ste LAN for status formato to detect faled or mssg devces Requestg a posto fx ad tme sychrozato from the GPS recever to check that the posto s wth the alarm (watch) crcle of the buoy, ad to update the clock Performg the measuremet of power supply voltage ad exteral voltages at the aalog to dgtal coverter (ADC) puts, cludg the temperature from a oboard temperature sesor. Depedg o selected msso parameters, the followg addtoal actos ca be performed: Sychrozato of the clocks of exteral AtoN equpmet based o GPS tme Measuremet ad aalyss of accelerato to detect collsos Measuremet ad aalyss of accelerato to detect a crtcal heel agle Measuremet ad aalyss of accelerato for heel agle statstcs Measuremet ad bufferg of raw accelerato data for trasmsso to the RCMC After performg the pre-programmed polls ad measuremets, a Telfco shall aalyze the results accordace wth ts msso profle, proceedg as follows: Itates a commucatos sesso wth the RCMC for sedg a error message (alarm status report) f ay abormal codtos were detected; effcesea.org 9 Part-faced by the Europea Uo

10 Itates a commucatos sesso wth the RCMC for sedg a regular status message (report) f the cocluded poll was the last oe the umber of polls gve as a terval for sedg regular status reports; Goes back to sleep mode for savg eergy, to be waked up ether by ay evet reports from exteral equpmet coected to ste LAN, or by teral clock upo arrval of the ext pollg tme. Whe a eed arses for sedg a status message to the RCMC, a Telfco uses a compact propretary 3- byte bary status message cotag the followg data tems: UTC tmestamp wth tme zoe offset specfed by RCMC settgs Power supply voltage level Temperature sde the Telfco eclosure (at the oboard temperature sesor) Last kow posto ad tme of the last GPS posto fx Status of the last kow posto: accuracy (GPS or DGPS), sde or outsde of the desgated area (alarm crcle radus); case of mssg posto fx, the probable reaso (watg tme exceeded or mssg coordates GPS recever s NMEA setece) Cotet of two last error messages ad tme of sedg GSM sgal feld stregth State of Telfco s two dgtal puts (passve or actve) Addtoal status bts markg error or warg states (checksum error of frmware or cofgurato settgs dscovered, crtcal or submerso heel agle exceeded, etc) I addto to the above stadard status formato, a Telfco matas records ad statstcs that must be quered by specfc scearos set up at the RCMC software. Each equpmet ut coected to a Telfco has ts ow 3-byte stadard status message that s forwarded to the RCMC durg a commucatos sesso wthout ay local aalyss. Cotet of such status messages depeds o the type of equpmet ad must be atcpated by the RCMC for correct recordg the system database. I case of a accelerato measuremet msso, the measuremet formato s set to the RCMC over a separate TCP/IP coecto (sesso), coded packages of dedcated format, ot wth status messages.. Telfco as a Sythetc AIS AtoN Data Source Whe a Telfco ut stalled oboard a buoy s tasked wth a sythetc AIS AtoN reportg msso, t s smply cofgured to sed ts status reports wth tme terval sutable for AIS etwork the area. Typcal reportg terval curretly use Estoa s 3 mutes, wth the lmtg factor for reducg the terval dow to 1 mute beg excessve power cosumpto of the commucato crcutry. For example, at the 3 mute AIS reportg terval, average daly power cosumpto of a ce buoy later E891.W a applcato as a 3.8 NM safe water buoy wth LFl W 10s flash (+8=10 s), s 7. Wh for commucato oly, totalg to 0 Wh per day wth the LED array (50 cd to 150 cd) operated at the lumous testy of 51 cd. I effcesea.org 10 Part-faced by the Europea Uo

11 case of a tradtoal AtoN motorg msso, the power cosumpto for commucato wll decrease to. Wh/day or eve 1.5 Wh/day whe reportg tervals of 0 mutes or 4 hours are appled, correspodgly. Trascodg of the AtoN status formato receved from a Telfco to a stadard M1 message ad routg of ths message to the AIS broadcastg etwork s performed by two software compoets workg at the server sde as descrbed sectos 3 ad 4..3 Oboard Buoy Heel Agle Calculato ad Statstcs Fuctoalty Cotemporary buoy laters geerally utlze LED techology that s relable ad power effcet, allowg desgg products wth arrow vertcal dvergece agle to spare eergy. Ths may result reduced omal rage of the lght sgal two opposte sectors already at small heel agles of the buoy carryg a LED later, wth sgfcat rage reducto at moderate agles, pared wth parastc lght sgal modulato due to buoy sway that dstorts the flashg patter see by the marer. Heel agle motorg ad statstcs capablty troduced Telfco eables aalyss of the dyamc behavour of a buoy deployed a specfc locato, allowg to determe feld prove vertcal dvergece agle requremets for the later mouted o ths buoy that are suffcet to guaratee requred vsblty rage of the lght sgal codtos domatg at ths locato. Z Y X Y Fgure. Telfco E961 s accelerato sesor axs drectos whe tegrated wth the Ice Buoy Later E891. Wth the buoy stadg uprght as expected at calm seas, the sesor output voltages correspod to the followg g values: X=0g; Y=0g; Z=1g. Whe stalled oboard a avgatoal buoy, the Telfco products allow to record buoy movemets by the meas of regsterg accelerato values three axes of the buoy, samplg the outputs of a 3-axal sold state accelerato sesor mouted o the E96X crcut board. Ths feature was orgally troduced for effcesea.org 11 Part-faced by the Europea Uo

12 determg heel agle statstcs for a buoy hostg a Telfco by sedg the raw accelerato measuremet values to the remote cotrol ad motorg cetre for processg. The latest geerato of Telfco products are capable of performg lmted local calculatos to establsh the buoy heel agle ad to keep average agle statstcs for pre-programmed tme perods, to sed warg messages to the RCMC upo detecto of crtcal heel agles exceedg the pre-set values sgfcatly reducg the vsblty rage (or forecastg mmet submerso of a ce buoy), as well as detectg excessve lateral acceleratos presumably resultg from a collso wth aother floatg object ad reportg such evets to the motorg cetre. The algorthm used for heel agle calculato s descrbed detal paragraph.4, cludg the decodg of meta-varables receved at the server sde. A Telfco ca be cofgured to sample the accelerato sesor outputs wth the terval of 0 ms to 5 s, whle the maxmum buffer sze for averagg s measuremets, resultg a maxmum of 46.6 hours wdow whe samplg at 0 ms. The base samplg terval for all actvtes relevat to accelerato measuremet s 0 ms, ad the measuremet tervals used for heel agle calculato, statstcs ad ole trasmsso ca be cofgured as equal to or multple of the base samplg terval. It s recommeded to select the tme wdow for average heel agle calculatos from the rage of 10 mutes to 4 h, accordace wth the reportg terval used, so that the averagg process does ot loose formato betwee commucato sessos. Whle oe average value s beg calculated startg from cleag the buffer, a tmestamped value of the precedg averagg perod s avalable for dowloadg up to the ed of the curret averagg perod whe t s replaced by the ew value. It s expected that Telfco based heel agle statstcs aalyss s arraged a way permtted by the Telfco s msso wth tmely requests for average values durg regular reportg sessos, ad further aalyss s performed at the RCMC..4 The Buoy Heel Agle Calculato Algorthm.4.1 Itroducto Ths secto provdes formato about the sgal processg prcples employed for obtag heel agle formato from avgatoal buoys ftted wth a AtoN Telematcs Feld Cotroller of the Telfco famly maufactured by Cyberetca AS. The clato agle calculato s based o buoy accelerato measuremets performed by a 3-axal sold state accelerometer (MEMS g-sesor) wth the maxmum rage of 3g, tegrated wth a Telfco module..4. Mathematcal Backgroud Calculato of the clato agle based o dgtzed real-tme accelerato data ca be performed by usg smple trgoometrc fuctos lke se or taget. For systems that have hardware floatg pot support, the most elegat ad easest way would be to use taget. I 8-bt embedded systems where all umbers have qute small rage, the oly feasble opto s to use the se fucto. 8-bt systems caot use taget because taget have fte value whe the agle s 90 degrees, ad t s very effcet to use fxed pot varables to store such values. Whe usg the se fucto for agle calculato, t s ecessary to use a addtoal operato; ths s ot a problem all systems wth suffcet avalable computatoal power. Ths addtoal calculato makes all data processg a lttle more tme cosumg ad may troduce small accuraces, makg ths approach ot sutable for raw accelerato data processg o the server sde. It s possble to smplfy the rest of calculatos by fdg the legth of the vector X-Y plae ad usg t as a sgle value descrbg the horzotal plae. Ths smplfcato s possble due to the absece of drectoal data the horzotal plae of the buoy. Legth (magtude) of the horzotal accelerato vector: effcesea.org 1 Part-faced by the Europea Uo

13 Where: a xy = x + y (1) xad y Accelerato values from X ad Y axs outputs of the sesor Se fucto also eeds the hypoteuse: h = a xy + z () Where: a xy z Legth of the horzotal accelerato vector Accelerato value from the Z axs output of the sesor The clato agle (buoy heel agle) ca be foud usg the followg formula (agle α s usually gve radas): a xy α = arcs (3) h.4.3 Agle Calculato Dyamc Evromet I real mare evromet, the accelerato values obtaed from the accelerato sesor are chagg cotuously whch ca cause some error short term calculatos. However, t s possble to perform a log term calculato that averages all put data ad thus wll elmate most errors caused by the costatly chagg accelerato. Averagg s possble because buoy movemet s mostly symmetrcal to all axes ad averagg provdes a cetral value wthout short term excessve accelerato peaks..4.4 Algorthm Realzato Telfco Frmware The most mportat lmtato at usg the clato agle calculato algorthm drectly Telfco frmware s the absece of square root, floatg pot ad trgoometrc fuctos. These fuctos ca oly be used o the server sde. Iclato agle calculato algorthm for Telfco s based o the followg smplfcato that results a meta-varable that s drectly proportoal to the clato agle, allowg takg actos at detectg certa threshold agles whe ecessary. Frst, the squares of cathet ad hypoteuse are calculated: a xy = x + y (4) h = axy + z (5) The clato agle meta-varable s calculated as follows: θ = a xy h c (6) effcesea.org 13 Part-faced by the Europea Uo

14 Where: c Costat 16 The result of formula 6 s a value that holds eough formato to uambguously determe the clato agle of the buoy from the vertcal axs. It ca be averaged locally, or forwarded to the server sde sde correspodg messages of the Telfco for use by other systems. Processg ecessary for decodg ths value s descrbed paragraph.4.6. Due to the lmtatos of Telfco hardware t s possble to use oly fxed pot values; therefore, all values shall be 16 bt rage ( ). Worst case accuracy δ s calculated as follows: θ = c s α (7) θ δ = α arcs (8) c, where the varable θ s rouded dow to a earest teger. Worst case accuracy ca the be foud by sertg agle values betwee 0º ad 90º to formulas 6 ad 7, resultg heel agle calculato errors as show detal o graphs Fgures 1,, ad 3. Fgure 3. Heel agle calculato errors over the full rage of 0º to 90º effcesea.org 14 Part-faced by the Europea Uo

15 Fgure 4. Heel agle calculato errors the rage of 1º to º Fgure 5. Heel agle calculato errors the rage of 0º to 1º effcesea.org 15 Part-faced by the Europea Uo

16 Resultatly, the worst case computatoal accuracy at determg the heel agle of a Telfco s 0.0º the rage of 0º to 1º degrees, 0.04º the rage of 1º to º degrees, ad 0.010º the rage of º to 90º..4.5 Averagg Algorthm Implemetato Telfco Implemetato of the average clato algorthm Telfco frmware s accomplshed as follows. Frst, the average square of the cathet ad the hypoteuse s calculated: 1 1 xy = x + = 1 = 1 a y (9) 1 xy z = 1 h = a + (10) The average clato agle over the averagg perod s calculated as show formula 11: θ = a xy h c = 1 = 1 1 x = 1 x = 1 1 y = 1 y + 1 c = 1 z = = = 1 x = 1 x + + = 1 y = 1 y + = 1 c z 1 1 = = 1 x = 1 x + + = 1 y = 1 y + = 1 c z 1 1 = (11) = = 1 x = 1 x + + = 1 y = 1 y + = 1 c z As see formula 11, agle averagg ca be accomplshed wthout dvso, smplfyg the calculatos..4.6 Decodg of Agle Data o the Server Sde Decodg of stataeous or average agle values from the meta-varables receved from a Telfco o the server sde s accomplshed as follows (the agle α s gve radas): θ α = arcs (1) c effcesea.org 16 Part-faced by the Europea Uo

17 Where: θ Coded agle meta-varable receved from a Telfco c A costat 16 To calculate the buoy heel agle from the vertcal axs degrees, the followg further operato s requred: 180 α deg = α π (13) NOTE: The buoy heel agle algorthm descrbed the paragraphs 4 ad 5 s mplemeted Telfco frmware startg wth verso.1 (96T101).5 Crtcal Heel Agle Warg Fuctoalty To utlze the calculated heel agle values for mmedate estmato of the effect of buoy movemet ad posture o the vsblty rage of the buoys lght sgal, two threshold values are foresee for motorg: Crtcal heel agle for trggerg a warg o reducto of the vsblty rage below specfcato publshed for the marers due to excessve heel agle; a typcal threshold value ca be the rage of 10 to 15 degrees (depedg o the vertcal dvergece of the later used), wth a flterg (averagg) wdow of 5 to 10 mutes to suppress occasoal peaks that are expectedly rare but may occur due to ose Near submerso heel agle for trggerg a warg o mmet submerso of a buoy due to probable ce pressure forcg the buoy to early horzotal agle; typcal threshold value ca be the rage of 30 to 40 degrees (depedg o the vertcal dvergece of the later used), wth a flterg (averagg) wdow of 3 to 5 mutes For studyg the dyamc behavour of a buoy, the user ca set ay agle value of terest as crtcal for gatherg the statstcs (couts of the cofgured agle value beg exceeded).. A submerso scearo wth the buoy heelg sgfcatly due to ce pressure from oe drecto s cosdered as most probable. Nevertheless, a scearo wth the ce buoy beg dragged away from the posto uprght ad skg due to the achor beg lfted to deeper waters s possble; t s possble to predct ths case of accelerato measuremet showg a stable posture of the buoy. Eablg of the warg report geerato s accomplshed by the RCMC cetre software wth the agle lmts of 1 to 89 degrees ad flterg lmts of 1 to measuremets. Accelerato sesor output samplg terval s from 0 ms (base terval) to 5 s; t ca be cofgured dvdually for heel agle measuremet fucto. effcesea.org 17 Part-faced by the Europea Uo

18 .6 Collso Detecto ad Warg Fuctoalty A Telfco ca be tasked wth collso detecto msso, based o motorg of the output values of the oboard 3-axal accelerato sesor. Whe collso detecto s actvated, the base sesor output samplg terval must be set to the shortest avalable (0 ms) for the Telfco to be able to detect fast chages accelerato. Cofgurable parameters clude the samplg terval, accelerato threshold for a collso evet, flterg (averagg) tme ad mmedate reportg requremet. Oce a Telfco detects a collso evet whle mmedate reportg s eabled, t tates a commucatos sesso wth the RCMC to sed a collso warg message. A correspodg data bt wll be set the status message showg that a collso evet has bee detected; whe mmedate reportg was ot requred, the RCMC wll receve ths formato durg the ext scheduled status reportg sesso. The last collso evet wth a tmestamp ad total umber of collsos detected are mataed sde a Telfco, accessble from the RCMC by a correspodg commucatos scearo..7 Accelerato Measuremet ad Ole Trasmsso Fuctoalty A Telfco ca be set up for a buoy accelerato measuremet msso wth ole data trasmsso to the RCMC, eablg collecto of buoy movemet data o the server sde for aalyss of buoy dyamcs ad sea state. Cofgurato of such msso ca be accomplshed oly from the RCMC by settg up a scearo to be dowloaded ad executed by a Telfco durg a commucatos sesso. The measuremet ca be cofgured to last ether utl the ext commucatos sesso (regular or alarm status report), or for a durato of set umber of LAN poll tervals. Correspodgly, ths allows settg up a measuremet arragemet ether wth cotuous or fragmetary data acqusto as ecessary for example, trasmttg accelerato data for 10 mutes twce a hour. I case of accelerato measuremet msso, the outputs of the oboard 3-axal accelerato sesor are sampled wth a set terval (from 0 ms to 5 s); measuremet values are buffered (63 samples from each axs, 5 bytes total). Oce the buffer s full, t s dspatched to the RCMC wth a TCP/IP packet. Whle t would be possble to trasmt each measuremet mmedately sde a sgle TCP/IP packet, cosderg the o tme crtcal applcato, t s ot feasble due to hgher commucato costs resultg from the packet overhead..8 Descrpto of the Data Acqusto Algorthm The measuremets by the ADC of Telfco s mcroprocessor are ot take wth smultaeous samplg: a fte tme terval typcally less tha 0.3 ms passes betwee the values are read from the multplexed put chaels coected to the aalog outputs of the accelerato sesor, except durg the frst samples ad case of uexpected terrupts from ste LAN whe ths delay may be slghtly hgher. From the pot of vew of Telfco s mssos, ths tme shft s sgfcat for measuremet of voltages ad temperature, ad ca be cosdered short eough for gorg t durg accelerato measuremet due to the lmted badwdth of the aalog output sgals of the sold state accelerato sesor. Wth accelerato measuremet actvated (for ay fucto), the measuremet values are obtaed from the ADC wth the set base terval (0 ms by default) the followg order: X axs output voltage Y axs output voltage effcesea.org 18 Part-faced by the Europea Uo

19 Z axs output voltage 3. AtoN remote motorg cetre software GPRS Keskus for provso of e-navgato servce frastructure elemets 3.1 Itroducto to the GPRS RCMC The ew remote cotrol ad motorg cetre software soluto developed at Cyberetca AS ad commssoed 009 at the Estoa Martme Admstrato had a workg project ttle GPRS Keskus ( GPRS RCMC ) due to the ma dstgushg feature: mplemetato of coectoless packet swtchg ad the TCP/IP protocol for commucato wth equpmet at the remote AtoN stes over the GSM/GPRS moble data lk stead of former use of dedcated GSM data coecto. Nevertheless, the RCMC software s ot GSM/GPRS specfc ad ca be cosdered future proof, allowg to work wth AtoN motorg equpmet utlzg the ekta propretary protocols over ay meda supportg the TCP/IP protocol. Whe such eeds arse, replacemet of the GSM/GPRS modems the upgraded Telfco products wth ew rado lk submodules (modems) s a foresee path, possbly requrg mmum frmware ad product form factor chages. The protocols utlzed for data trasfer wth AtoN LAN (A-Bus) as well as betwee the RCMC ad AtoN stes are kept cofdetal for preservg the securty ad tegrty of the system. Other sgfcat dffereces compared to the prevous geerato were mgrato to the Lux operatg system stead of MS Wdows, a web-based mult-user terface stead of dedcated clet software, utlzato of the PostgreSQL database stead of Paradox, ad troducto of support for ew features of the Telfcos (FOTA upload, buoy heel agle measuremet, crtcal heel agle alarms, etc). Daly operato of the AtoN motorg s performed usg a set of HTML/JavaScrpt based webpages served to the users by the GVL software compoet of the RCMC for system status dsplay ad equpmet cofgurato. A smple text-based structured table showg coloured blocks wth AtoN umbers sde was chose for the ma stuato status scree over a chart based graphcal dsplay due to the terface effcecy - capablty of provdg a clear techcal overvew of AtoN operatoal stuato, ucluttered by rrelevat detals, ad the speed of avgatg betwee dfferet screes (Fgure 6). Nevertheless, a terface s provded for dsplayg the AtoNs o the mare chart backgroud usg exteral web-based applcato. The user terface of RCMC software s curretly provded the Estoa laguage. The operatoal status dsplay of a AtoN ste reflects formato from at least two remote equpmet uts: a Telfco, ad a flasher (two redudat cofguratos). The coloured blocks presetg the status of each remote AtoN ste have two coloured dcators: a frame ad a fll, wth the frame colour represetg posto status (o stato / off stato / ukow) ad the fll colour represetg avgato lght status (ormal / malfucto / ukow). I addto, the colour of the AtoN umber shows whether the lght s o or off, wth strke through style o gray backgroud tellg that formato o ths AtoN ste s ot avalable. effcesea.org 19 Part-faced by the Europea Uo

20 Fgure 6. Screeshot of the AtoN operatoal stuato status overvew page of the GPRS RCMC The ma scree presets colour coded operatoal status of all regstered AtoN stes subject to remote motorg by rego, cludg thrd party AtoNs that are reportg to the martme authorty. The whole software soluto s descrbed correspodg mauals ad ole help wdows. Fgure 7. AtoN status dsplay blocks o the GPRS RCMC operatoal stuato status overvew scree. A whte umber depcts a AtoN ste wth avgato lght curretly ON, ad a black umber wth the lght off. A black border depcts ukow posto of the AtoN, whle red ad gree dcate Off stato ad O stato, respectvely. Crossed blocks dcate faled commucato sessos durg a caledar day status hstory. effcesea.org 0 Part-faced by the Europea Uo

21 The curret RCMS s foresee for motorg of ad hadlg message streams from up to 00 AtoN stes the curret software/hardware cofgurato, wth expected upscalg capablty to thousads of remote stes whe ecessary. 3. AtoN Motorg Msso Cofgurato Depedg o the prmary AtoN motorg msso objectve, a Telfco ca be set up ether for regular AtoN status motorg wth lowest achevable power cosumpto ad commucatos costs, or for exteded motorg wth addtoal msso objectves lke heel agle statstcs ad motorg, collso detecto, accelerato measuremet ad sythetc AIS AtoN reportg as descrbed paragraph.1. Specfcs of a msso are defed usg varous cofgurato settgs avalable va RCMC equpmet cofgurato pages. Typcal operatoal settgs of a Telfco also deped o the type of AtoN ste where t s stalled. Recommeded settgs for motorg of a buoy subject to sythetc AIS AtoN reportg: The GPS recever s power s set to costatly o to guaratee mmedate posto fxes, mproved postog precso ad lesser amout of posto jumps The GPS poll perod s set to 1mute The GPS posto fx delay tme s set to 5 s The Off stato / Mssg coordates alarm s set to 3 to 4 cosecutve cases The regular reportg terval s selected wth the rage of 3 to 6 mutes (preferably 3 mutes, but beware the mplcatos o commucatos costs ad power cosumpto) The flasher s cofgured ot to report the Lght O / Lght Off evets (regular reportg s frequet eough). I case of a floatg AtoN that s ot subject to sythetc AIS AtoN reportg, the GPS recever s power s selected based o crtcalty of the AtoN ste, desty of vessel traffc the rego, allowable latecy of detectg off stato stuatos, ad avalable resources (eergy, commucatos costs). Recommeded settgs for motorg of a regular buoy system: The GPS recever s power s set to costatly o to guaratee mmedate posto fxes The GPS poll perod s set to or 3 mutes depedg o avgatoal sgfcace of the AtoN ad whether the watch crcle of the buoy s smaller or larger The GPS posto fx delay tme s set to 5 s The Off stato / Mssg coordates alarm s set to 3 to 4 cosecutve cases The regular reportg terval s set to 15 or 0 mutes The flasher s cofgured to report the Lght O / Lght Off evets Recommeded settgs for motorg of a regular buoy system ecoomy mode : effcesea.org 1 Part-faced by the Europea Uo

22 The GPS recever s power s set to trckle mode to guaratee lowest power cosumpto The GPS poll perod s set to 5 to 15 mutes depedg o whether the watch crcle of the buoy s small, medum, or large The GPS posto fx delay tme s set to 40 s The Off stato / Mssg coordates alarm s set to 3 cosecutve cases The regular reportg terval s set to 30 to 40 mutes The flasher s cofgured to report the Lght O / Lght Off evets It s mportat to ote that the ecoomy motorg mode wth log reportg tervals, t may take hours for the RCMC to dscover mssg reports. The crtera of mssg commucatos warg should be set the rage of.5 to 3.5 reportg tervals. Also, oce such buoy has drfted off stato, t s recommedable to execute a scearo settg the reportg terval equal to the GPS posto poll terval to keep track of the buoy movemet ad war the marers whe ecessary. Recommeded settgs for motorg of a fxed AtoN system: Presece of a GPS recever o a fxed AtoN depeds o the eed of GPS sychrozato (leadg lghts, etc). Whe preset, GPS power s set to trckle mode to guaratee lowest power cosumpto; case of utlty power, costatly o s recommeded The GPS poll perod s set to 6 mutes, whle the watch crcle parameter s set to at least 500 m to avod rrelevat alarms The GPS posto fx delay tme s set to 40 s Posto alarm s dsabled The regular reportg terval s set to 30 to 10 mutes The flasher s cofgured to report the Lght O / Lght Off evets Whe a GPS recever s ot used, the system must be correspodgly cofgured. I such cases the server performs sychrosato of Telfco clock over the etwork. Remag msso parameters of a Telfco are cofgured based o motorg or measuremet requremets. 3.3 Recepto ad Hadlg of Status ad Warg Messages from AtoN Stes The Telfco uts resdg at the AtoN stes tate TCP/IP commucato sessos to the pre-cofgured IP socket (IP address ad port umber) lsteed by the PaSS software compoet resdg o the RCMC server accordg to regular reportg tervals, or upo detecto of ay reportable evets (equpmet malfuctos, parameter out of rage wargs, etc). The cofgurato settgs fle of PaSS allows to select oe of fve levels for loggg of raw data receved from the Telfcos at remote AtoN stes, wth the most detaled settg resultg loggg of every data byte receved, to the least detaled settg of loggg oly the hardware ad software errors reported. effcesea.org Part-faced by the Europea Uo

23 The PaSS software compoet extracts detaled ste ad devce specfc parameters from the bary data, determg the category of the comg status report whether t s a regular status report, warg, or error report. The results are compared to the last kow status of the equpmet, wth the results recorded the correspodg locatos of the AtoN database whe ecessary. All rregular status reports (errors ad wargs) are saved to the database full. Typcally, detaled results of regular status reports are ot saved to the database, oly the tme of last sesso ad the correspodg sesso couter are updated. All receved formato s saved whe sgfcat chages status report cotet are dscovered, whe the exstg formato s outdated accordg to the crtera set for a partcular AtoN, or whe a commucatos breakup exsted pror to recevg a status report. The data tems receved are processed to obta the curret operatoal status of the AtoN ste, ad to take actos whe ecessary: mmedate dspatchg of formato to the mateace persoel, loggg of alarms to the database, etc. The stuato status page of the user terface shall be updated wth the results of ths aalyss. 3.4 Recepto ad Hadlg of Navgato-Related Messages from AtoN Stes Upo recevg a message wth the cotet reportg sgfcat avgato-related evets at the AtoN ste lke GPS coordates outsde the watch crcle of a buoy or falure of the lght sgal, the followg actos are take: The mateace persoel resposble for the AtoN ste are otfed about the evet by e-mal, cludg a SMS text message delvered to ther moble phoes (e-mal by SMS) The status report s saved to the database full The operatoal status of the AtoN s correspodgly chaged. After checkg the receved formato, the operator may decde to request addtoal formato from the AtoN ste, selectg a sutable scearo or settg up a ew oe for retrevg such formato, actvatg t, ad placg a call to the GSM umber of the correspodg AtoN to force the Telfco to a ew commucatos sesso resultg uploadg of updated formato. 3.5 Trascodg of Sythetc AtoN AIS Messages The PaSS software compoet performs mmedate trascodg of relevat data receved from a Telfco oboard a buoy subject to sythetc AIS AtoN broadcastg to a propretary $PCYBA setece, ad forwards t over the TCP/IP etwork to the AIS Router software compoet resdg at the IP address provded the cofgurato fle. For the formato to be relevat at the tme of AIS rado broadcastg, total tme delay troduced by the cha Telfco -> GSM/GPRS etwork -> TCP/IP groud etwork -> PaSS -> AIS Router -> AIS etwork -> AIS base stato must be less tha 60 s. Expectedly, tme delay from Telfco to AIS Router remas below 0 s for 99% of tme. The $PCYBA termedate data setece wth cotet ecessary for formattg of a AIS AtoN message M1 s developed at Cyberetca AS NMEA 0183 style. It cossts of the comma separated felds carryg the formato o AtoN posto, status, etc, for example: $PCYBA,100107,090533,16, , ,N, ,E,A,1,9,7,0,0,Aks N buoy,0, ,1,Wrog Locato*1F effcesea.org 3 Part-faced by the Europea Uo

24 Based o the error status descrpto embedded ths setece, the AIS Router s able to prepare ad broadcast correspodg AIS messages M1 ad M14 whe ecessary. The off posto dcator (OPI) wll be set after measured posto dfferece (a dstace from the assged posto) aalyss performed by the PaSS software. Typcally, the crtera for settg OPI to 1 s defed as K*r, where K>1 to create a larger drft tolerace before actvatg broadcastg of off posto wargs over the AIS etwork; K values betwee 1. ad 1.5 are recommeded. The protocol s descrbed the followg documet: Packet-oreted NMEA-$PCYBA protocol descrpto, Documet umber N-B7650-, Cyberetca AS, 007 ( Estoa). 3.6 Recepto ad Hadlg of Crtcal Heel Agle Warg Messages from AtoN Stes Crtcal ad ear submerso heel agle warg messages are set to the RCMC by a Telfco whe the heel agle motorg fuctoalty s actvated, the correspodg thresholds are exceeded, ad the reportg s actvated. Upo recept of such messages, the PaSS software compoet records the status the database, otfes the mateace persoel assged to relevat group by e-mal or SMS message, but does ot chage the AtoN status to malfucto. 3.7 Recepto ad Hadlg of Collso Warg Messages from AtoN Stes Collso warg messages are set to the RCMC by a Telfco whe the mpact motorg fuctoalty s actvated, correspodg accelerato threshold s exceeded, ad the reportg s actvated. Upo recept of such messages, the PaSS software compoet records the evet the database ad otfes the mateace persoel assged to relevat group by SMS message for mmedate detfcato of the cause of collso. 3.8 Recepto ad Hadlg of Average Heel Agle Data from AtoN Stes To receve heel agle statstcs from a Telfco stalled o a buoy, frst the correspodg fuctoalty of the Telfco must be actvated wth ecessary averagg wdow cofgured; the a scearo must be prepared at the RCMC for requestg the heel agle statstcs meta-varable durg the status reportg commucatos sessos. Ths meta-varable s coverted to the agle value degrees ad stored the AtoN database where these values are accessble for further aalyss. Preparato of the arragemet for calculato of average heel agles of a buoy over a gve perod ad cluso of the results automated reports s work progress. For example, whe hourly averages of buoy heel agle are of terest, t s recommeded to set both the averagg terval ad the reportg terval of the Telfco to oe hour. I case of a buoy subject to sythetc AIS AtoN reportg, the scearo would retreve average heel agle meta-varable durg every reportg sesso; such cases t s recommeded to shorte the averagg to match the reportg terval. 3.9 Recepto ad Hadlg of Accelerato Data from AtoN Stes To receve accelerato data from a Telfco stalled o a buoy, frst the correspodg fuctoalty of the Telfco must be actvated wth ecessary samplg terval ad measuremet perod legth cofgured (umber of poll perods or full tme betwee status reports), ad the a scearo must be prepared at the RCMC for actvatg the ole trasmsso of accelerato data. I ths case the RCMC wll ot close the commucatos sesso but wll wat for the accelerato data packets to arrve. Accelerato measuremet wll be terrupted whe t s tme to sed a regular status report, or a error report. If the accelerato effcesea.org 4 Part-faced by the Europea Uo

25 measuremet scearo has ot bee removed the meatme, the system assumes accelerato data recepto whe the status message s processed. The RCMC shall record the receved data to bary fles wth ames formed wth detfcato of the data source (Telfco s seral umber), date ad tme of begg of the measuremet sesso. Accelerato data are ot saved to the database; the fles created are teded for aalyss by exteral software applcatos. Itegrato of ole accelerato data aalyss for sea state estmato s subject to a further feasblty study Estmato of AtoN Performace ad Aalyss of Servce Avalablty The PaSS software compoet of the RCMC gathers statstcs o several aspects of AtoN operato cludg avalablty. Curretly, the automated daly report cludes the followg system performace data tems: Percetage of tme whe the lght was o whe requred (%) Percetage of tme whe a buoy was located sde the watch crcle (%) Percetage of commucato sessos tated ad cocluded accordg to expectatos (%) Percetage of tme whe the commucatos were cosstet a mssg report s dscovered wth the tme of 3 to 5 plaed tervals, but the aalyss s doe from the frst mss (%) Percetage of successful sythetc AIS AtoN message trasmssos to the AIS Router (%) Percetage of sythetc AIS AtoN messages trasmtted to the AIS Router wth trasmsso delays exceedg the 30 s maxmum allowable delay (%). I addto, other formato relevat to system avalablty estmato s gathered: AtoN ste power supply voltages uder load ( flash) ad wthout load (durg eclpse), average tme delay from gettg the GPS fx to sedg out the AIS setece, etc. Itroducto of automated reports wth performace statstcs for loger tme perods s curretly uder cosderato Web-Based Iterface for Isttutoal ad Publc Access Ole access to the RCMC s possble oly through user authetcato. Exstg RCMC software eables cofgurato of user groups wth dfferet levels access rghts, allowg provdg access to the system to thrd partes who operate AtoN stes wth compatble equpmet. For ths kd of access, all AtoN stes belogg to such 3 rd party user are arraged to a sgle AtoN group (rego) ad all ecessary rghts for cofgurato ad maagemet of these AtoNs s provded to such user, wth the excepto of system ad accout admstrato. Ope publc access drectly to RCMC s ot permtted; a specfc subset of webpages s created for ole Database of Ads to Navgato. Tests have show that GSM/GPRS commucatos betwee a Telfco deployed at a sgfcat physcal dstace from the RCMC ca be rather stable eve for accelerato measuremets; therefore t s expected to be feasble to use the cetre for buoy movemet ad heel agle aalyss by thrd partes whe permtted by the Estoa Martme Admstrato. effcesea.org 5 Part-faced by the Europea Uo

26 3.1 Itegrato wth Legacy ad Exteral Systems A large amout of AtoN stes of the Estoa Martme Admstrato s stll motored by the prevous geerato of GSM commucatos cotrollers that are uable to use the GSM/GPRS data commucatos. Operatoal ad statc parameters of these AtoN stes are mataed a Paradox database that s also used the commo process of maagemet of AtoN deploymet ad cofgurato. Itegrato of the RCMC wth ths exstg AtoN database s accomplshed to the level where the statc settgs of AtoN stes subject to GSM/GPRS based motorg the ew AtoN database are sychrosed oce every ght wth the old Paradox database. A work progress s tegrato of the RCMC database wth a exteral chart server, allowg presetg the avgatoal formato of subject AtoN s o the backgroud of a electroc avgato chart (ENC) rght wth the GVL user terface. The followg formato s preseted o the chart, provded that t does exst the RCMC database: Statc status formato of all AtoN stes: desgated posto of the achor (stato), radus of the deploymet crcle, watch crcle, ad alarm crcle. The achor symbol s dsplayed whe a buoy s curretly deployed. Water depth at the buoy stato Track hstory of a selected buoy over a gve tme perod. Posto symbols are show accordace wth posto status as reported by the correspodg Telfco: o stato (ormal, sde the alarm crcle), off stato (fltered (averaged) posto outsde the alarm crcle), or a sgle posto detected outsde the alarm crcle (off-stato alarm ot actvated yet) Buoy movemet vectors showg the drecto of drftg betwee the postos fxed Perodc refresh of the formato the database of the chart server s motored by a software tool used for system motorg Nagos. effcesea.org 6 Part-faced by the Europea Uo

27 Fgure 8. Floatg AtoN (buoy) stato formato ad track hstory dsplayed o ENC backgroud The status of other software ad hardware compoets operatg at the RCMC s also motored by a exteral applcato Nagos for detecto ad loggg of server sde falures. Implemetato of a redudat system wth automated falover s uder cosderato. 4. AIS Ifrastructure Used for AtoN Status Report ad Safety Related Message Broadcast 4.1 AIS Message Routg ad Broadcastg The AIS Router s a software compoet resposble for formattg of the $PCYBA setece cotet receved from PaSS to proper M1 sythetc AIS AtoN messages, ad routg these messages to the relevat AIS base statos the AIS shore frastructure for broadcastg. It typcally resdes the AIS/VTS segmet of the avgato safety frastructure ad has tmely formato about locato ad status of all AIS base statos as well as of the AIS traffc the etwork, allowg substtutg a eghbour base stato for broadcastg stead of a malfuctog base stato where ecessary. effcesea.org 7 Part-faced by the Europea Uo

28 I addto to message M1 formato, the AIS Router ca be set up for geeratg safety related AIS messages M1 ad M14 case of detectg AtoN malfucto dcators the $PCYBA setece. No feedback s gve such cases to the RCMC whch curretly operates merely as a source of $PCYBA seteces, loggg ad aalyzg oly ts ow output setece stream. The AIS Router operato s descrbed the documet AIS Router - a module for routg AtoN-specfc AIS messages M8, M1, M14, ad M1, Documet umber: Y-399-8, Cyberetca AS, AIS Chael Load Produced by Sythetc AIS AtoN Messages The curret RCMC / AIS Router mplemetato eables full cotrol of the sythetc AIS AtoN message broadcastg at two key pots the system: the RCMC, ad the locato where the AIS Router resdes (ether RCMC or the AIS/VTS cetre). It s possble to adjust the reportg frequecy as ecessary to mata a reasoable AIS chael load wthout the expese of travellg to a buoy to shut dow a dedcated AIS AtoN traspoder whe such eeds arse. The mmum target load used specfed for software egeerg was trasmsso of the sythetc messages from at least 00 AtoN stes, up to oe report per mute from each. effcesea.org 8 Part-faced by the Europea Uo