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印度区域导航系统IRNSS接口控制文件.pdf
IRNSS SIGNAL-IN-SPACE ICD FOR SPS VERSION 1.0
ISRO-IRNSS-ICD-SPS-1.0
SIGNAL IN SPACE ICD
FOR
STANDARD POSITIONING SERVICE
VERSION 1.0
CONFIGURATION DEFINITION DOCUMENT
JUNE 2014
SATELLITE NAVIGATION PROGRAMME
ISRO SATELLITE CENTRE
INDIAN SPACE RESEARCH ORGANIZATION
The contents of this document are the copyright of Indian Space Research Organization (ISRO), Government of India. It is
released on the condition that it shall not be copied in whole, in part or otherwise reproduced and the contents thereof shall not
be divulged without prior written consent of ISRO
BANGALORE
ISRO-IRNSS-ICD-SPS-1.0
IRNSS SIS ICD FOR
STANDARD POSITIONING SERVICE
VERSION 1.0
JUNE 2014
CONFIGURATION DEFINITION DOCUMENT
REVIEWED BY
_____________________________
L. MRUTHYUNJAYA
HEAD, SATELLITE NAVIGATION
PROGRAMME MANAGEMENT OFFICE
APPROVED BY
_____________________________
A.S.GANESHAN
PROGRAMME DIRECTOR
SATELLITE NAVIGATION PROGRAMME
ISRO SATELLITE CENTRE
INDIAN SPACE RESEARCH ORGANIZATION
BANGALORE
BANGALORE
IRNSS SIGNAL-IN-SPACE ICD FOR SPS VERSION 1.0
Preface
This document provides the Signal and the Data Structure for Standard Positioning Service
(SPS) of the Indian Regional Navigational Satellite System (IRNSS). The document
addresses the signal modulations, the frequency bands, the received power levels, the data
structures and their interpretations, user algorithms etc.
This document is filed for copyright registration by Indian Space Research Organization (ISRO), Government of India in July
2014. It is released on the condition that it shall not be copied in whole, in part or otherwise reproduced and the contents
thereof shall not be divulged without prior written consent of ISRO
Terms of Use & Disclaimers
The IRNSS Signal-in-Space ICD for SPS is released to the public to provide the essential
information on the IRNSS signal-in-space, to facilitate research & development and aid the
commercial use of the IRNSS signals for navigation-based applications, according to the
terms and conditions specified hereafter:
– The publishing authority does not make any assurance on the fitness of the
information furnished in the document for any specific purpose. The contents of the
document are only for information and the publishing authority does not assume any
legal liability for any product developed based on the information. No liability is
herby assumed for any consequences arising out of the usage of the information
contained in the IRNSS SIS ICD for SPS.
– The IRNSS SIS ICD for SPS shall not be reproduced or transmitted, partly or wholly,
in electronic or print medium without the consent of the publishing authority.
– The information furnished in the IRNSS SIS ICD for SPS could be subject to
modification and update. Although the publishing authority shall take its best efforts
to notify the public about the updates in the SIS ICD, it does not assume any
obligation to advise any person or organization on its future updates of SIS ICD.
Table of Contents
1.
INTRODUCTION............................................................................................................. 1
1.1 SCOPE OF THE DOCUMENT.......................................................................................... 1
1.2 DOCUMENT OVERVIEW................................................................................................ 1
2
IRNSS SYSTEM OVERVIEW ........................................................................................ 2
2.1 IRNSS ARCHITECTURE .................................................................................................. 2
2.2 IRNSS SPACE SEGMENT ................................................................................................ 2
2.3 IRNSS GROUND SEGMENT ........................................................................................... 3
2.4 USER SEGMENT .............................................................................................................. 3
2.5 IRNSS SERVICES ............................................................................................................. 3
3
IRNSS SIGNAL CHARACTERISITCS ........................................................................ 4
3.1 IRNSS FREQUENCY BANDS .......................................................................................... 4
3.2 IRNSS CARRIER FREQUENCIES ................................................................................... 4
3.3 MODULATION SCHEME ................................................................................................ 5
3.3.1 Standard Positioning Service .................................................................................................. 5
3.3.2 Interplex Modulation .............................................................................................................. 5
3.4 TRANSMITTED SIGNAL PHASE NOISE ...................................................................... 7
3.5 CORRELATION LOSS...................................................................................................... 8
3.6 TRANSMITTED SIGNALS CODE/DATA COHERENCY ............................................. 8
3.7 SPURIOUS CHARACTERISTICS .................................................................................... 8
3.8 RECIEVED POWER LEVELS ON GROUND ................................................................. 8
3.8.1 Minimum Levels ..................................................................................................................... 8
3.8.2 Maximum Levels .................................................................................................................... 8
3.9 POLARIZATION CHARACTERISTICS .......................................................................... 9
3.10 CHANNEL GROUP DELAY .......................................................................................... 9
4
IRNSS PRN CODES ....................................................................................................... 10
4.1 PRN CODES FOR SPS .................................................................................................... 10
4.1.1 SPS Code Generation ............................................................................................................ 10
5
IRNSS DATA STRUCTURE ......................................................................................... 13
5.1 BIT AND BYTE ORDERING CRITERIA ...................................................................... 13
5.2 FEC ENCODING ............................................................................................................. 13
5.3 INTERLEAVING ............................................................................................................. 14
5.4 SYNC WORD ................................................................................................................... 14
5.5 TAIL BITS ........................................................................................................................ 14
5.6 CYCLIC REDUNDANCY CHECK (CRC) ..................................................................... 14
5.7 IRNSS SYSTEM TIME .................................................................................................... 15
5.8 COORDINATE SYSTEM ................................................................................................ 15
5.9 FRAME STRUCTURE .................................................................................................... 15
5.9.1 Sub Frame Structure ............................................................................................................. 15
5.10 IRNSS NAVIGATION DATA ....................................................................................... 17
5.10.1 Primary Navigation Parameters .......................................................................................... 17
5.10.2 Secondary Navigation Parameters ...................................................................................... 17
5.10.3 Idle Pattern .......................................................................................................................... 18
6
SUBFRAME STRUCTURE .......................................................................................... 19
6.1 SUBFRAME DATA FORMAT ....................................................................................... 19
6.1.1 Subframe 1 Data Format ....................................................................................................... 19
6.1.2 Subframe 2 Data Format ....................................................................................................... 20
6.1.3 Subframe 3 & 4 Data Format (IRNSS Message Structure) .................................................. 21
6.2 DATA CONTENTS .......................................................................................................... 29
6.2.1 Subframe 1 & Subframe 2 .................................................................................................... 29
6.2.2 Message Type 5 Data Contents ............................................................................................. 32
6.2.3 Message Type 7 Data Contents ............................................................................................. 36
6.2.4 Message Type 9 Data Contents ............................................................................................. 36
6.2.5 Message Type 11 Data Contents ........................................................................................... 37
6.2.6 Message Type 14 Data Contents ........................................................................................... 38
6.2.7 Message Type 18 Data Contents ........................................................................................... 39
6.2.8 Message Type 26 Data Contents ........................................................................................... 40
6.2.9 Message Type 0 Data Contents ............................................................................................. 41
6.3 BROADCAST INTERVALS ........................................................................................... 41
Appendix A. Algorithm For Satellite time correction ....................................................... 43
Appendix B.
Algorithm For Ephemeris Computation ...................................................... 44
Appendix C. Algorithm for 1st Order Ionosphere Free Range for Dual Frequency
User .................................................................................................................. 46
Appendix D. Algorithm for Ionosphere Delay Corrections for Single Frequency User
using Ionosphere Grid Corrections .............................................................. 47
Appendix E.
Algorithm for Satellite Position Computation using Almanac ................... 51
Appendix F.
Algorithm for IRNSS Time offsets computation with respect to UTC,
UTC(NPLI) and other GNSS ........................................................................ 53
Appendix G. Algorithm for application of EOP ................................................................. 55
Appendix H. Algorithm For Ionosphere Delay computation using coefficients .............. 56
Appendix I.
Algorithm for Satellite Position and Clock offset computation using
Differential Corrections ................................................................................. 58
IRNSS SIGNAL-IN-SPACE ICD FOR SPS VERSION 1.0
List of figures
Figure 1: IRNSS Architecture .................................................................................................... 2
Figure 2: IRNSS Space Segment Interface with User Segment ............................................... 3
Figure 3: Spectrum for Radio Navigation Satellite Services in L Band .................................... 4
Figure 4: Spectrum for IRNSS Signal in S Band ....................................................................... 4
Figure 5: Composites Signal Generation ................................................................................... 7
Figure 6: SPS code generator ................................................................................................... 12
Figure 7 : IRNSS Code Timing Diagram ................................................................................ 12
Figure 8 : IRNSS Subframe Structure ..................................................................................... 13
Figure 9: FEC Encoding .......................................................................................................... 13
Figure 10: Master Frame Structure .......................................................................................... 15
Figure 11: Structure of Subframe 1 & 2 .................................................................................. 16
Figure 12: Structure of Subframe 3 & 4 .................................................................................. 16
Figure 13: Subframe 1 Data Layout......................................................................................... 20
Figure 14: Subframe 2 Data Layout......................................................................................... 20
Figure 15: Message Type 5 Data Layout ................................................................................. 23
Figure 16: Message Type 7 Data Layout ................................................................................. 24
Figure 17: Message Type 9 data layout .................................................................................. 25
Figure 18: Message Type 11 data layout ................................................................................. 26
Figure 19: Message Type 14 Data Layout ............................................................................... 27
Figure 20: Message Type 18 data layout ................................................................................. 27
Figure 21: Message Type 26 data layout ................................................................................ 28
Figure 22: Message Type 0 data layout ................................................................................... 29
Figure 23: Identified IGPs for Grid Based Corrections over Indian Region ........................... 33
Figure 24: Ionospheric Pierce Point Geometry ........................................................................ 47
Figure 25: Four Point Interpolation Algorithm ........................................................................ 48
Figure 26: Three Point Interpolation Algorithm ...................................................................... 49
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