Galileo OS SIS ICD.indd - GSA - Europa

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Page Type 4: Ephemeris (3/3), GST-UTC conversion, GST-GPS conversion and TOW. Note that the clock is repeated in this page type Type=4 IODnav Ephemeris (3/3) C ic C is A 0 GST-UTC Conversion GST-GPS Conversion 32 © European Union 2010 Document subject to terms of use and disclaimers p. ii-iii OD SIS ICD, Issue 1, February 2010 A 1 ∆t Ls t ot WN ot WN LSF DN ∆t LsF t 0G A 0G A 1G WN 0G TOW Spare CRC Tail Total (bits) 6 10 16 16 32 24 8 8 8 8 3 8 8 16 12 6 20 5 24 6 244 Table 34. Bits Allocation for F/NAV Page Type 4 Page Type 5: Almanac (SVID1 and SVID2(1/2)), Week Number and almanac reference time Type=5 IODa WNa t0a SVID1 ∆(a1/2) e ω δi SV SVID1 Ω 0 ● Ω M0 af0 a f1 SV SVID2(1/2) E5aHS SVID2 ∆(A1/2) e ω δi Ω0 (1/2) CRC Tail Total (bits) 6 4 2 10 6 13 11 16 11 16 11 16 16 13 2 6 13 11 16 11 4 24 6 244 Table 35. Bits Allocation for F/NAV Page Type 5 Page Type 6: Almanac (SVID2(2/2) and SVID3) Type=6 IODa Ω0 (2/2) SV SVID2(2/2) SV SVID3 Ω M 0 a f0 a f1 E5a HS SVID3 ∆(A 1/2) e ω δ i Ω 0 ● ● Ω M 0 a f0 a f1 E5a HS Spare CRC Tail Total (bits) 6 4 12 11 16 16 13 2 6 13 11 16 11 16 11 16 16 13 2 3 24 6 244 Table 36. Bits Allocation for F/NAV Page Type 6 4.2.5. F/NAV Dummy Page Defi nition In case no valid F/NAV data is to be transmitted, the satellite generates and downlinks the dummy pages (Page Type 63) replacing the pages in the nominal sequencing, according to the format in Table 37. CRC is computed on the Page Type and Dummy sequence fi elds. Type=63 Dummy sequence CRC Tail Total (bits) 6 208 24 6 244 Table 37. Bits Allocation for F/NAV Dummy Page 4.3. I/NAV Message Description 4.3.1. General Description of the I/NAV Message The I/NAV message structure is presented in Figure 15, where the duration of each entity is indicated.
Figure 15. I/NAV Message Structure in the Nominal Mode The I/NAV message structures for the E5b-I and E1-B signals use the same page layout since the service provided on these frequencies is a dual frequency service, using frequency diversity. Only page sequencing is different, with page swapping between both components in order to allow a fast reception of data by a dual frequency receiver. Nevertheless, the frame is designed to allow receivers to work also with a single frequency. 4.3.2. I/NAV Page Layout Two types of I/NAV pages are defi ned ● Nominal pages having a duration of 2 seconds transmitted sequentially in time in two parts of duration 1 second each on each of the E5b-I and E1-B components according to Table 39. The fi rst part of a page is denoted ‘even’ and the second one is denoted ‘odd’. ● Alert pages having a duration of 1 second transmitted in two parts of duration 1 second each at the same epoch over the E5b-I and E1-B components according to Table 40. Again, the fi rst part of a page is denoted ‘even’ and the second one is denoted ‘odd’. This transmission is repeated at the next epoch but switching the two parts between the components. The I/NAV page part (even or odd) layout is defi ned in Table 38 for both nominal and alert page types. This table shows the symbols allocation and bits allocation separately. The different fi elds composing this layout are defi ned in the sections below. Sync. I/NAV Page Part (even or odd) Symbols Total (symb) 10 240 250 4.3.2.1. Synchronisation Pattern I/NAV Page Part (even or odd) Bits Tail Total (bits) 114 6 120 Table 38. I/NAV Page Part Layout The synchronization pattern allows the receiver to achieve synchronisation to the page boundary. Note the synchronisation pattern is not encoded. The I/NAV synchronisation pattern is 0101100000 © European Union 2010 Document subject to terms of use and disclaimers p. ii-iii OD SIS ICD, Issue 1, February 2010 33
Page 1 and 2: European uropean GNSS (Galileo) Ope
Page 3 and 4: and/or standardisation purposes acc
Page 5 and 6: Table of Contents 1. Introduction .
Page 7 and 8: C.3. Primary Codes for the E5a-I Co
Page 9 and 10: List of Tables Table 1. Carrier Fre
Page 11 and 12: 1. Introduction 1.1. Document Scope
Page 13 and 14: 2.1.3. Receiver Reference Bandwidth
Page 15 and 16: e e e e E5a �I E5a �Q E5b� I
Page 17 and 18: The relation of the 8 phase states
Page 19 and 20: Component (Parameter Y) Sub-carrier
Page 21 and 22: For purposes of establishing user r
Page 23 and 24: 3.3. Primary Codes Generation The p
Page 25 and 26: Code No Start Value Initial Sequenc
Page 27 and 28: Code No Table 17. Base Register 2 S
Page 29 and 30: Code Identifi er Code Length No. of
Page 31 and 32: Code Identifi er Code Length No. of
Page 33 and 34: SVID E5a-I E5a-Q E5b-I E5b-Q 27 E5a
Page 35 and 36: SVID E5a-I E5a-Q E5b-I E5b-Q 21 CS2
Page 37 and 38: 4.1.4. FEC Coding and Interleaving
Page 39 and 40: 4.2.3. F/NAV Frame Layout The F/NAV
Page 41: Subframe 12 4.2.4. F/NAV Page Conte
Page 45 and 46: Even/odd=0 Page Type E5b-I E1-B Res
Page 47 and 48: 4.3.4. I/NAV Nominal Frame Layout T
Page 49 and 50: Word Type 3: Ephemeris (3/4) and SI
Page 51 and 52: Even/odd=0 Page Type E5b-I E1-B Dum
Page 53 and 54: Start bit = 1 Part (5/8) Part (6/8)
Page 55 and 56: Parameter Defi nition Bits Scale fa
Page 57 and 58: leap seconds. Since the next leap s
Page 65 and 66: Table 79. Almanac Parameters * Para
Page 67 and 68: 7. Annex B - Defi nitions and Nomen
Page 69 and 70: 59 Component Primary Code Length (c
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9 9 E A 5 0 F 7 C 9 E B 3 8 9 9 0 F
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9. Annex D - Licence Agreement for
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1.12. OS SIS ICD - the Open Service
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around the scope, terms and conditi
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ARTICLE 9 - Infringements by third
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For the EUROPEAN COMMISSION: For ad
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Territorial coverage File reference
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10. Annex E - Licence Agreement For
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1.11 Licensee Background - shall me
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operation of the Infrastructure Dev
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ARTICLE 9 - Infringements by third
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For the EUROPEAN UNION: For adminis
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Territorial coverage File reference
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