Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
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Word Type 3: Ephemeris (3/4) and <strong>SIS</strong>A<br />
Type=3<br />
IOD nav<br />
●<br />
Ω<br />
∆n<br />
Ephemeris (3/4)<br />
C UC<br />
C US<br />
C RC<br />
Table 49. Bits Allocation for I/NAV Word Type 7<br />
© European Union 2010<br />
Document subject to terms of use and disclaimers p. ii-iii<br />
OD <strong>SIS</strong> <strong>ICD</strong>, Issue 1, February 2010<br />
C RS<br />
<strong>SIS</strong>A<br />
Total<br />
(bits)<br />
6 10 24 16 16 16 16 16 8 128<br />
Table 45. Bits Allocation for I/NAV Word Type 3<br />
Word Type 4: SVID, Ephemeris (4/4), and Clock correction parameters<br />
Type=4<br />
IOD nav<br />
SV ID<br />
Ephemeris (4/4) Clock correction<br />
C ic<br />
C is<br />
t 0c<br />
a f0<br />
a f1<br />
a f2<br />
Spare<br />
Total<br />
(bits)<br />
6 10 6 16 16 14 31 21 6 2 128<br />
Table 46. Bits Allocation for I/NAV Word Type 4<br />
Word Type 5: Ionospheric correction, BGD, signal health and data validity status and<br />
GST<br />
Type=5<br />
a i0<br />
Ionospheric correction<br />
Az<br />
a i1<br />
a i2<br />
Region 1<br />
Ionospheric<br />
disturbance fl ag<br />
Region 2<br />
Region 3<br />
Region 4<br />
Region 5<br />
BGD(E1,E5a)<br />
BGD(E1,E5b)<br />
E5b HS<br />
E1B HS<br />
E5b DVS<br />
E1B DVS<br />
WN<br />
GST<br />
TOW<br />
Spare<br />
Total<br />
(bits)<br />
6 11 11 14 1 1 1 1 1 10 10 2 2 1 1 12 20 23 128<br />
Table 47. Bits Allocation for I/NAV Word Type 5<br />
Word Type 6: GST-UTC conversion parameters<br />
GST-UTC conversion parameters<br />
Type=6<br />
A 0<br />
A 1<br />
∆t LS<br />
t 0t<br />
WN ot<br />
WN LSF<br />
DN<br />
∆t LSF<br />
TOW<br />
Spare<br />
Total<br />
(bits)<br />
6 32 24 8 8 8 8 3 8 20 3 128<br />
Table 48. Bits Allocation for I/NAV Word Type 6<br />
Word Type 7: Almanac for SVID1 (1/2), almanac reference time and almanac reference<br />
week number<br />
Type=7<br />
IOD a<br />
WN a<br />
t 0a<br />
SVID1<br />
(∆a) 1/2<br />
e<br />
SVSVID1 (1/2)<br />
ω<br />
δ i<br />
Ω 0<br />
Ω<br />
M 0<br />
Reserved<br />
Total<br />
(bits)<br />
6 4 2 10 6 13 11 16 11 16 11 16 6 128<br />
●<br />
39
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