Internal Calibration Software Requirements

Transcription

1 REQUIREMENT SPECIFICATION Internal Calibration Software Requirements This document is stored electronically. Printed version might not be the latest. SAOCOM PROJECT COMISION NACIONAL DE ACTIVIDADES ESPACIALES BUENOS AIRES ARGENTINA

2 SAOCOM PROJECT Number Title Summary Internal Calibration Software Requirements Requirements Specification for SAOCOM SAR Internal Calibration Software Secondary Reference Circulation Level 1 o 2 This document is digitally signed Workflow Summary State Assignee Action Completed Date hmartirena Review Approved 05/10/2012 jpcuesta Review Approved 06/10/2012 mpetruccioli Review Approved 09/10/2012 jmedina Approve Approved 09/10/2012 Changes Record Issue Date Author PARA Description A 14/Sep/12 J. Giardini Systems Engineer Initial Release J.P. Cuesta SAR System Manager Comisión Nacional de Actividades Espaciales (CONAE) from Argentina owns the copyright of this document which is supplied in confidence and which shall not be used for any purpose other than that for which it is supplied and shall be only reproduced, copied or communicated, in whole or in part, for internal use of CONAE, directly or by third parties holding confidentiality agreements with CONAE. Any person other than the authorized holder obtaining possession of this document by finding or otherwise, should send it, together with his name and address, in a sealed envelope to: Comisión Nacional de Actividades Espaciales (CONAE) SAOCOM Project Av. Paseo Colón 751 (C1063ACH) Capital Federal ARGENTINA Letter postage need not be prepaid. Other postage will be refunded. Page 2 of 12

3 INDEX 1 OBJECTIVE SCOPE APPLICABLE AND REFERENCE DOCUMENTS APPLICABLE DOCUMENTS REFERENCE DOCUMENTS DEFINITIONS AND ABBREVIATIONS DEFINITIONS ABBREVIATIONS AND ACRONYMS INTRODUCTION INPUT AND OUTPUT PRODUCTS REQUIREMENTS GENERAL FUNCTIONAL PERFORMANCE SOFTWARE DESIGN SOFTWARE CONFIGURATION SOFTWARE TOOL PLATFORM AND RESOURCES SOFTWARE TOOL INTERFACE SOFTWARE TOOL DOCUMENTATION Comisión Nacional de Actividades Espaciales (CONAE) Page 3 of 12

4 1 OBJECTIVE The objective of this document is to specify the software requirements for the Internal Calibration tool. 2 SCOPE This specification is applicable to the SAOCOM mission Ground Segment software. 3 APPLICABLE AND REFERENCE DOCUMENTS 3.1 APPLICABLE DOCUMENTS The list of reference documents is the following. ID DOC ID TITLE [AD 1] SAO-TN-ARE-PL-0003 SAOCOM Acquisition Modes Design [AD 2] SOG-CAL-TN-300-A SAOCOM Internal calibration scheme [AD 3] SAO-SYS-PL A SAOCOM System Calibration Plan [AD 4] SOR-SRS-DS A SAR Instrument Design Document [AD 5] TBW SAR Antenna Requirements Document [AD 6] TBW SAR Antenna Design Document [AD 7] TBW SAR Antenna AIT Plan [AD 8] TBW SAR Antenna V&V Plan [AD 9] TBW CTR Requirements Document [AD 10] TBW CTR Design Document [AD 11] TBW CTR AIT Plan [AD 12] TBW CTR V&V Plan [AD 13] TBW PSU Requirements Document [AD 14] TBW PSU Design Document [AD 15] TBW PSU AIT Plan [AD 16] TBW PSU V&V Plan [AD 17] TBW TRM Requirements Document [AD 18] TBW TRM Design Document [AD 19] TBW TRM AIT Plan [AD 20] TBW TRM V&V Plan [AD 21] TBW RM Requirements Document [AD 22] TBW RM Design Document [AD 23] TBW RM AIT Plan [AD 24] TBW RM V&V Plan [AD 25] SAO-PAS-RS A L2B SAOCOM SAFETY AND PRODUCT ASSURANCE REQS [AD 26] GS-USS-DSN-IC User Segment Service ICD For Applications and Processors [AD 27] GS-USS-DSN-IC User Segment Service ICD For Applications and Processors [AD 28] TBW ICAL SYSTEM LEVEL PHILOSOPHY [AD 29] TBW ICAL Chirp reconstruction philosophy Comisión Nacional de Actividades Espaciales (CONAE) Page 4 of 12

5 3.2 REFERENCE DOCUMENTS No reference documents are specified within this document. 4 DEFINITIONS AND ABBREVIATIONS 4.1 DEFINITIONS No specific definitions are used within this document. 4.2 ABBREVIATIONS AND ACRONYMS The list of reference documents is the following. AIT AIV AM ANT API ARCH CAL CDR CE CGSS CODS CTR DEM ECSS EDSM EM FTP GB GPPU GS HH HV ICAL ICALSW ISLR L0 L1 ORR OS PCC PDR PFM PM PSLR PSU QR RAM RF Acceptance, Integration and Test Acceptance, Integration and Validation Antenna Model Antenna Application Program Interface Archive and database subsystem Calibration Critical design review Central electronics Conae GS services Conae orbit dynamic services Reception and Transmission Unit Digital elevation model European Cooperation on Space Standardization External data sources management system Engineering Model File transfer protocol Gigabyte Generic product processing unit Ground Segment Horizontal-Horizontal Horizontal-Vertical Internal Calibration Internal Calibration software tool Integrated Side Lobe Ratio Level zero Level one Operations Readiness review Operating system Pulse coded calibration Preliminary design review Proto-Flight Model Production management subsystem Peak Side Lobe Ratio Power Supply Unit Qualification review Random access memory Radiofrequency Comisión Nacional de Actividades Espaciales (CONAE) Page 5 of 12

6 RM SAR SARS TBC TBW TRM VAL VH VV XML Radiating Module Synthetic Aperture Radar To be confirmed To be written Transmission and Reception Module Validation Vertical-Horizontal Vertical-Vertical Extensive Markup Language Comisión Nacional de Actividades Espaciales (CONAE) Page 6 of 12

7 5 INTRODUCTION This introductory notice is not part of the requirement and is only provided as background information. Internal calibration software (ICALSW) is a tool that allows SAR System (SARS) calibration. From the functional point of view, the SARS is composed of a flying SAR sensor, which is equipped with an on board calibration system and a ground processing station generating calibrated images. On ground, the images are produced and calibrated based on the downstream data obtained via the downlink channel. These information includes both SAR echo signals and calibration signals. The software tool specified within this document is responsible for extracting the calibration data from the stream, and producing a set of calibration constants, a process aided by telemetry information. 6 INPUT AND OUTPUT PRODUCTS As shown in Figure 1 the internal calibration processor products are the sensor calibration constants for the central electronics and antenna phased array, and also chirp replicas for the CE. All of them are obtained by the calibration processor by using the products of the L0 Formatter and the antenna model, together with the information provided by the configuration file which defines processing options and also contains sensor pre-flight characterization data. Calibration at multiple points in the dynamic range may also require access to the ARCH database (CUSS Archive and Database Subsystem). Table 1. Input and output elements and their relationship with sources and consumers. Product Type Source Consumer CE Calibration Constants Antenna Calibration Constants On board calibration data On board calibration routine Output product - Antenna Model Software Output product - Antenna Model Software Input product L0 Formatter - Input product L0 Formatter - Sensor Telemetry Input product L0 Formatter - Antenna Feed Input API Antenna Model - Pre-Launch Characterization Processing configuration Threshold configuration Input product internal database - Input product internal database - Input product internal database - Comisión Nacional de Actividades Espaciales (CONAE) Page 7 of 12

8 CUSS - Partial PM (Production Manager Subsystem) Annotated L0 Product Antenna model software Conf. File L0 Annotated formatter CE Chirp Replica ANT Phase & Gain Matrix CE Phase & Gain Antenna pattern Chirp replica SAR raw data (CCSDS Virtual Channels) Conf. File Internal calibration processor Conf. File SAR W-K processor Conf. File Calibration Constants Precision orbit & attitude Generic Product Processing GPPU Unit (GPPU) LogFile.xml ParameterFile.xml StatusFile.xml ReturnFile.xml Calibrated L1 product DEM store EDSM (External Data Sources Managment Subsystem) ARCH (Archive and Database Subsystem) Calibration constants CAL/VAL CGSS CCSDS virtual channels CODS Precision orbit & attitude References ARCH-based products transfer CUSS interface with processors XPNet FTP-based transfer xxx product CUSS Product PU Data processor Figure 1. Data flow Comisión Nacional de Actividades Espaciales (CONAE) Page 8 of 12

9 7 REQUIREMENTS 7.1 GENERAL Requirement: ICALSW shall be implemented as a software tool. Requirement Supported activities ICALSW shall: - support the instrument on-ground AIT/AIV activities - support the instrument in-orbit calibration - support the SAOCOM GS development activities - support the performance assessment analysis of the SAR instrument, flight segment and system mission Requirement Integration ICALSW shall be integrated to:- SAOCOM GS - SAOCOM SAR Instrument Simulator - SAOCOM Flight Segment Simulator - SAOCOM System Mission Simulator. Requirement On-ground activities ICALSW on-ground activities shall include: - Fitting, verification and validation of the ICALSW for in-flight operation against actual measurements results at SAR CE, SAR antenna and SAR instrument level. Requirement 7.1-4: In-flight activities The ICALSW in-flight activities shall include: - Use of internal calibration modes for actual phased array antenna RF paths gain and phase drift measurement - Estimation of phased array antenna elements excitation drift (in order to produce Antenna phase and gain drift matrix up to the TRMs, without including Radiant Modules since they are not included in Internal Cal. paths, and using the Antenna Model Software API to retrieve and compensate for antenna calibration network components behavior) - Measurement of CE phase and gain drifts - Generation of the CE chirp replica based on internal calibration modes (to which the Antenna model software shall later apply the antenna transference function to obtain the system replica) based in chirp reconstruction models. INFORMATION: Chirp reconstruction models are specified in [AD 29]. - Update of the software if major differences between estimated values and possible values to obtain in-flight antenna measured patterns are detected Requirement 7.1-5: Agreement to SAOCOM SAR ICAL System Level Philosophy ICALSW results shall be in agreement with [AD 28] so that ICAL system level accuracy requirements are obtained. Comisión Nacional de Actividades Espaciales (CONAE) Page 9 of 12

10 7.2 FUNCTIONAL Requirement ICALSW shall produce a set of system internal calibration constants used to correct the sensor state at the time of acquisition. Requirement ICALSW shall use pre-launch characterization data to produce the calibration constants. Requirement ICALSW shall use on board calibration data generated by the on-board calibration system to produce the calibration constants. Requirement ICALSW shall use sensor telemetry data to produce and / or validate the calibration constants. Requirement ICALSW shall use Antenna Model data through the AM provided API to produce the calibration constants. Requirement ICALSW shall use predefined and yet configurable processing algorithms to produce the calibration constants. Requirement ICALSW shall use sensor configuration data representing the system at the time of acquisition to produce the calibration constants. Requirement ICALSW shall use on-board calibration routine to produce the calibration constants. Requirement ICALSW shall implement PCC of different lengths Requirement ICALSW shall estimate CE gain and phase calibration constants for each polarimetric channel Requirement ICALSW shall estimate TRM internal calibration constants for each polarimetric channel Requirement ICALSW shall estimate antenna RF paths internal calibration constants for each polarimetric channel Requirement ICALSW shall be able of providing nominal outputs based only on partial information. Requirement ICALSW tool shall provide a log for execution flow tracking including unique identifiers such as execution date and time. Comisión Nacional de Actividades Espaciales (CONAE) Page 10 of 12

11 Requirement ICALSW log file maximum size shall be configurable and controlled by ICALSW. 7.3 PERFORMANCE Requirement 7.3-5: Agreement to SAOCOM SAR ICAL System Level Accuracy ICALSW results shall be in agreement with [AD 28] so that ICAL system level accuracy requirements are obtained. Requirement Execution time ICALSW execution time to deliver the required antenna patterns for calibrating any SAOCOM acquisition mode product shall be less than 10 minutes. 7.4 SOFTWARE DESIGN Requirement Open source libraries ICALSW software tool shall be developed using open source libraries. Requirement Modularity and maintainability ICALSW software architecture shall be modular to allow progressive development and maintainability. 7.5 SOFTWARE CONFIGURATION Requirement ICALSW parameters shall be configurable to permit modification of any input data, procedure and thresholds. Requirement: each instrument ICAL acquisition mode shall be fully supported by the ICALSW. 7.6 SOFTWARE TOOL PLATFORM AND RESOURCES Requirement Microprocessor compatibility ICALSW tool shall be able to run on Intel x-86 32bit and 64bit based platforms with one or more microprocessor cores. Requirement RAM ICALSW shall need no more than 4GB of memory. Requirement Operative system ICALSW OS target shall be Ubuntu Linux LTS (version >10). 7.7 SOFTWARE TOOL INTERFACE Requirement ICALSW software shall provide means to be included in SAOCOM automatic image processing chain without requiring operators. Comisión Nacional de Actividades Espaciales (CONAE) Page 11 of 12

12 Requirement ICALSW software shall be delivered with three execution interfaces: 1. A linux command line set of executable for integration to the automatic image processing chain. 2. A graphic user interface for model parameters configuration and outputs visualization 3. A library with a clearly defined API to be embedded in other calibration/validation, diagnostic and simulation front-end tools in order to get access to in-flight measurements, pre-launch characterization data, sensor configuration, sensor temperatures components. Requirement All ICALSW software interfaces shall be able to accept the inputs and provide the outputs defined in the functionality requirements segment. Requirement I/O Products Structure ICALSW software input and output products shall be defined based on XML format and agreed with the corresponding users and providers, ensuring compatibility to GS according to GS-USS- DSN-AN (CUSS Products General Structure). Requirement Command line executable control interfaces ICALSW software control interfaces used for command line execution shall be defined based on XML format, ensuring compatibility to GS and according to GS-USS-DSN-IC (User Segment Service ICD For Applications and Processors). Requirement All configuration parameters used shall be stored in XML files and date/time tagged for model configuration traceability and repeatability. Requirement Input and output products in production chain ICALSW working as an unattended executable in the processing chain shall support input and output products and their relationship with source and consumer processors described in the Table 1. Requirement Configuration file ICALSW configuration file (according to CUSS ICD for processors and applications) shall include as a minimum all the processing parameters, pre-launch characterization ICALSW internal DB pointers, threshold values. Processing parameters shall include the selection of antenna phase and gain matrix product data level (at int. cal. RF path level, TRM level, antenna RF Tx or Rx level, etc). Requirement Simulators interface The ICALSW API will be used as interface for Mission, Satellite and Instrument simulators. 7.8 SOFTWARE TOOL DOCUMENTATION Requirement Documentation standard The software documentation to be delivered shall be in accordance with the applicable standard ECSS-E-40. Requirement Programming language For individual processors, the software shall be written in a single language to be chosen by the Contractor and agreed with the Agency. Comisión Nacional de Actividades Espaciales (CONAE) Page 12 of 12