Galileo OS SIS ICD.indd - GSA - Europa

4.1.3. Bit and Byte Ordering Criteria .....................................................................................................26
4.1.4. FEC Coding and Interleaving Parameters ...................................................................................27
4.1.4.1. FEC Encoding ...................................................................................................................................... 27
4.1.4.2. Interleaving ........................................................................................................................................... 27
4.1.5. Frame and Page Timing ...............................................................................................................27
4.2. F/NAV Message Description ............................................................................................................28
4.2.1. General Description of the F/NAV Message ...............................................................................28
4.2.2. F/NAV Page Layout ......................................................................................................................28
4.2.2.1. Synchronisation Pattern ........................................................................................................................ 28
4.2.2.2. Tail Bits .................................................................................................................................................. 28
4.2.2.3. F/NAV Word .......................................................................................................................................... 28
4.2.3. F/NAV Frame Layout ....................................................................................................................29
4.2.4. F/NAV Page Contents ..................................................................................................................31
4.2.5. F/NAV Dummy Page Defi nition ....................................................................................................32
4.3. I/NAV Message Description ............................................................................................................32
4.3.1. General Description of the I/NAV Message..................................................................................32
4.3.2. I/NAV Page Layout .......................................................................................................................33
4.3.2.1. Synchronisation Pattern ........................................................................................................................ 33
4.3.2.2. Tail Bits .................................................................................................................................................. 34
4.3.2.3. I/NAV Page Part .................................................................................................................................... 34
4.3.3. I/NAV Nominal Sub-Frame Layout ...............................................................................................35
4.3.4. I/NAV Nominal Frame Layout .......................................................................................................37
4.3.5. I/NAV Word Types ........................................................................................................................38
4.3.6. I/NAV Dummy Message Layout ...................................................................................................40
4.3.7. SAR Field Structure .....................................................................................................................41
5. Message Data Contents......................................................................................................... 44
5.1. Navigation Data .................................................................................................................................44
5.1.1. Ephemeris ....................................................................................................................................44
5.1.2. Galileo System Time (GST) .........................................................................................................46
5.1.3. Clock Correction Parameters .......................................................................................................47
5.1.4. Satellite Time Correction Algorithm ..............................................................................................47
5.1.5. Broadcast Group Delay ................................................................................................................48
5.1.6. Ionospheric Correction .................................................................................................................49
5.1.7. GST-UTC Conversion Algorithm and Parameters ........................................................................50
5.1.8. GPS to Galileo System Time Conversion and Parameters ..........................................................51
5.1.9. Service Parameters ......................................................................................................................52
5.1.9.1. Satellite ID ............................................................................................................................................. 52
5.1.9.2. Issue Of Data ........................................................................................................................................ 52
5.1.9.3. Navigation Data Validity and Signal Health Status ............................................................................... 52
5.1.9.4. Checksum ............................................................................................................................................. 53
5.1.10. Almanac .......................................................................................................................................54
5.1.11. Signal In Space Accuracy ............................................................................................................55
5.2. SAR Data ...........................................................................................................................................55
6. Annex A - List of Acronyms ..................................................................................................56
7. Annex B - Defi nitions and Nomenclature ............................................................................ 57
8. Annex C - Galileo E1 and E5 Memory Codes ...................................................................... 58
C.1. Introduction .......................................................................................................................................58
C.2. Hexadecimal Coding Convention ...................................................................................................58
vi © European Union 2010
Document subject to terms of use and disclaimers p. ii-iii
OD SIS ICD, Issue 1, February 2010