Galileo OS SIS ICD.indd - GSA - Europa

Word Type 8: Almanac for SVID1 (2/2) and SVID2 (1/2))
Type=8
IOD a
a f0
SV SVID1(2/2) SV SVID2(1/2)
a f1
E5b HS
40 © European Union 2010
Document subject to terms of use and disclaimers p. ii-iii
OD SIS ICD, Issue 1, February 2010
E1B HS
SVID2
∆(A 1/2)
e
ω
δ i
Ω 0
Ω
Spare
Total
(bits)
6 4 16 13 2 2 6 13 11 16 11 16 11 1 128
Table 50. Bits Allocation for I/NAV Word Type 8
Word Type 9: Almanac for SVID2 (2/2) and SVID3 (1/2))
Type=9
IOD a
WN a
t 0a
M 0
a f0
SV SVID2(2/2) SV SVID3(1/2)
a f1
E5b HS
E1B HS
SVID3
∆(A 1/2)
e
●
ω
δ i
Total
(bits)
6 4 2 10 16 16 13 2 2 6 13 11 16 11 128
Table 51. Bits Allocation for I/NAV Word Type 9
Word type 10: Almanac for SVID3 (2/2) and GST-GPS conversion parameters
Type=10
IOD a
Ω 0
●
Ω
M 0
SV SVID3(2/2)
a f0
a f1
E5b HS
E1B HS
GST-GPS conversion
parameters
A 0G
A 1G
t 0G
WN 0G
Total
(bits)
6 4 16 11 16 16 13 2 2 16 12 8 6 128
Word Type 0: I/NAV Spare Word
Type=0
Time
Table 52. Bits Allocation for I/NAV Word Type 10
Spare
WN
GST
TOW
Total
(bits)
6 2 88 12 20 128
Table 53. Bits Allocation for Spare Word
When the fi eld ‘Time’ is not set to ‘10’, the fi elds WN and TOW do not contain valid data.
4.3.6. I/NAV Dummy Message Layout
In case no valid I/NAV data is to be transmitted, the satellite generates and downlinks
the dummy message on E5b-I and E1-B components replacing the pages in the nominal
sequencing, according to the Dummy pages layout defi ned in Table 54.