DGP000814AAA
2-01
F-14
Standard GPS navigation message
GSS6100 and SimCHAN user manual
© Spirent Communications Plc 2005 - 2007
F.1.6 Page ID 51
This page contains health words for satellites 1 through 24. The health word
for the simulated satellite is all ok, and the health words for all of the other
satellites is all bad. Page ID 51 is transmitted on page 25 of subframe 5.
F.1.6.1
Page ID 51 – Word 3
Bits Contents
1 – 2
data ID : data ID two
(01)
3 – 8
Page ID : 51
(11 0011)
9 – 16
almanac reference time t
oa
:8192 seconds
(2x12
-12
seconds)
(0000 0010)
17 – 24
almanac reference week WN
a
: second week
(0000 0001)
25 – 30
parity
(calculated =** ****)
F.1.6.2
Page ID 51 – Word 4
Bits Contents
1 – 6
Satellite health for SV 1 :All zeros if SV ID is
1, all ones otherwise
(0000 00 or 1111 11)
7 – 12
Satellite health for SV 2 : All zeros if SV ID is
2, all ones otherwise
(0000 00 or 1111 11)
13 – 18
Satellite health for SV 3 : All zeros if SV ID is
3, all ones otherwise
(0000 00 or 1111 11)
19 – 24
Satellite health for SV 4: All zeros if SV ID is
4, all ones otherwise
(0000 00 or 1111 11)
25 – 30
parity
(calculated =** ****)