BPA Regional Meetings. The Use of GPS in CPE

Transcription

1 BPA Regional Meetings The Use of GPS in CPE by Gary Smith BEng PGDip MSc CEng MCIHT MILT MIPP Technical Details Supplied by Korec & Trimble

2

3

4

5

6 We Will Cover: Principles of GPS CPE Applications Planning Presentation Outline If Time Permits We Will Also Cover: Sources of Error Accuracy Factors Differential GPS

7 Principles of GPS? Introduction to GPS

8 The Global Positioning System (GPS) Developed by the American Department of Defence (DoD) ALL WEATHER, 24 Hour, worldwide time and positional information service Minimum of 4 Satellites required for a position 3 Segments: Control; Space: User:

9 Segments Space Segment Control Segment User Segment

10 Control Segment Monitors and controls satellite orbits 1 Master control station ( Colorado Springs USA ) 12 Monitoring Stations

11 28 Satellites 22,000km above the earth 12 Hour Orbits Space Segment How does GPS Works? 4 or more satellites required Travel time of GPS Distance= Speed x Time Principle of Trilateration The Global Positioning System

12 User Segment Receive signals from Space Segment Information is used to determine our position CPE Applications??? The Global Positioning System

13 CPE Applications?

14 CPE Applications CCTV Smart Car Enforcement of Bus, Parking & Traffic Contraventions using either: Attended or Un-Attended Mode Digital GPS Camera Positional Condition Survey Enforcement of Parking Contraventions XT / XH DGPS systems RTK GPS Systems Positional Location of Signs & Lines (& Any Asset)

15 Autonomous (10-15m) E.g. GPS Sat Nav CPE Applications DGPS (Differential)(0.5-3m) E.g. CCTV Smart Car & Digital GPS Camera Float (Meter to decimeter) E.g. GPS Handheld Systems Fixed (1-3cm) E.g. R8 GPS/GNSS System

16 CCTV Smart Car

17 Digital GPS Camera

18 Digital GPS Camera

19 Digital GPS Camera

20 Digital GPS Camera

21 XT / XH DGPS systems

22 RTK GPS Systems

23

24 GPS Surveying

25 Google Earth View of Surveying

26 Google Earth View of GPS Surveying

27 GPS Surveying Transferred to FastMap

28 GPS Surveying Transferred to MapInfo

29 MapInfo Transferred to ParkMap

30 Planning?

31 Planning GPS

32 Planning GPS & GNSS

33 Sources of Error?

34 Sources of Error These factors cannot be controlled! Obstructions Multipath

35 Obstructions

36 Multipath

37 Accuracy Factors?

38 Accuracy These factors can be controlled by the GPS receiver: Satellite Geometry Elevation Mask

39 Satellite Geometry (DOP) A measurement of satellite dispersion relative to each other Often measured in DOP (Dilution of Precision) Standard deviational spread of satellites. Lower the DOP the more spread out the satellites are relative to each other Lower the DOP the greater the accuracy To obtain sub meter accuracy, a Positional DOP (PDOP) of 6.0 less is required Accuracy Factors

40 Good Satellite Geometry (DOP) Accuracy Factors

41 Poor Satellite Geometry (DOP) Accuracy Factors

42 Elevation Mask 15 Degrees above the horizon Atmosphere Accuracy Factors

43 Controlling Accuracy Factors Accuracy Factors are controlled by a simple Slider Bar in FastMAP DOP value of less than 6.0 Signal to Noise Ratio greater 4.0 Elevation mask of 15 o Speed or Accuracy?

44 Differential GPS?

45 Differential GPS (DGPS) GPS Positions on their own are often referred to as Autonomous (uncorrected). Autonomous GPS will give you typically 10-15m To improve this we need to perform some form of Differential correction to our GPS positions (DGPS)

46 Real Time DGPS A means of applying differential corrections whilst collecting GPS positions at the Rover Requires direct communication to a base or ground control station Rover Correction only Base

47 VRS (Virtual Reference Station) Trimble VRS NOW Real-time RTK / DGPS correction service provided by Ordnance Survey & Trimble s Network of Base stations. Corrections provided by GPRS/3G Requires a subscription fee & mobile phone costs 30cm accurate with XT / XH DGPS systems cm accurate with RTK GPS Systems

48 VRS How it works 3 Steps 1) Rover receiver sends VRS server its location from 5 or more satellites 2) VRS finds 3 nearest base stations and creates virtual base station within 10km of the Rover 3) VRS Server sends back DGPS corrections the Rover

49 Any Questions?

50 Company Profile Gary Kay Smith Ltd was established in 2005 to match the Key Skills of its founders as Business Management Consultants with Specialist Aspects including: Business Management Consultancy Communications Training

51 Consultancy Services Business Management Financial Management Change Control Financial Analysis Benchmarking Value Engineering Business Case Preparation, Monitoring & Review Project Management Prince2 Philosophy MS Project & MS Excel Project Plans

52 Consultancy Services Consultancy Highway Development Planning application assessments Transport impact assessments Parking accumulation surveys Asset surveying & mapping (inc Landscaping, Street Furniture & Trees) Parking Traffic Management Act 2004 specialist advice Business case preparation CPE feasibility business plan and implementation Review of Parking Controls (inc GIS mapping of asset data) Traffic and Transportation Accident analysis Junction design Road space solutions Traffic Sign Design and Traffic Regulation Orders Public Consultation including statistical analysis of results

53 Consultancy Services Communications Analysis Spatial Analysis Demographic Analysis Equality & Diversity Analysis Response Analysis Customer Feedback Consultation Presentations Workshops Workgroups Mystery Shopper Postal Surveys Door to Door Surveys One to One Interviews

54 Consultancy Services Training City & Guilds & Edexcel Approved Centre CCTV Civil Enforcement Officers (plus Notice Processing & Supervisors) Community Wardens (plus Accredited Persons) Conflict Management Customer Service Health & Safety in the Workplace ILM Centre (Team Leading, Leadership & Management) NVQ Centre Security Guarding City & Guilds GOLA Centre Mobile testing facilities using our suite of laptop computers One Day Technical Courses In house course tailored to our Clients Needs

55 Introduction To Key Staff Gary Smith is the Managing Director of Gary Kay Smith Ltd Gary is a former Parking Manager He is a Chartered Engineer, Masters Qualified with over 25 years Industry related experience in Highways, Parking, and Traffic & Transportation In both Public and Private Sectors Kay Smith is a Director of Gary Kay Smith Ltd Kay is a former Assistant Parking Manager She is a Degree Qualified Engineer with over 15 years Industry related experience in Highways, Parking, and Traffic & Transportation In both Public and Private Sectors Danny Purton is the Business Manager & Quality Co-ordinator Danny is a former Head of Service He is a Chartered Engineer with over 40 years Industry related experience in Business Management, IT and Quality Systems Peter Matthews is the Office & IT Manager Peter is a former IT Specialist He has over 20 years industry related experience In the GIS/GPS Surveying, IT and Parking Sectors

56 Contact Us W: E: T: (01279) F: (01279) M: A: Allen House 1 st Floor Edinburgh Way Harlow Essex CM20 2HJ