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but with each byte ordered LSB first, such that m1 corresponds to bit 68 of subframe 1, and m576 corresponds to bit 287 of
subframe 3.
Note. clude word 1 (TLM) or word 2 (HOW), which start each subframe, or the 6
ari
ASS satellite shall be calculated using
GLONASS satellite ephemeris mask of
s to bit 85 of string 1, and m340 corresponds
For a SBAS geostationary satellite, the ephemeris CRC, if transmitted shall be coded as all zeros. The CRC shall be ordered
ch that r1 is the first bit transmitted and r16 is the last bit transmitted.
v ich corrections for the ranging source are expected to remain
available, relative to the modified Z-count for the first measurement block.
oding: 1111 1110 = The duration is greater than or equal to 2 540 seconds.
bsystem.
on parameter (P): a parameter that characterizes the impact of res
e first measurement block in the message.
ary satellite, the ephemeris decorrelation parameter, if transmitted, shal
bsystems t
r shall be coded as all zeros.
ephemeris CRC for core satellite constellation(s) ranging sources sh
th of the CRC code shall be k = 16 bits. The CRC ge
The CRC informat field, M(x), for a given satell
M(x) =
nΣ
mixn–1 = m1xn–1 + m2xn–2
i 1
=
For a GPS satellite, M(x) shall be of leng
fr
— M(x) for a GPS satellite does not in
p ty bits at the end of each word.
For a GLONASS satellite, M(x) shall be of length n = 340 bits. M(x) for a GLON
trings 1, 2, 3 and 4 of the data transmission from that satellite, s ANDed with the
Table B-65. Bits shall be arranged in transmission order such that m1 correspond
to bit 1 of string 4.
su
Source a ailability duration: the predicted duration for wh
C
1111 1111 = Prediction of source availability duration is not provided by this ground su
3.6.4.2.4 The measurement block parameters shall be as follows:
Ranging source ID: the identity of the ranging source to which subsequent measurement block data are applicable.
23/11/06 APP B-84
Appendix B Annex 10 — Aeronautical Communications
Table B-64. GPS satellite ephemeris mask
Subframe 1: Byte 1 Byte 2 Byte 3 Byte 1 Byte 2 Byte 3
Word 3 0000 0000 0000 0000 0000 0011 Word 4 0000 0000 0000 0000 0000 0000
Word 5 0000 0000 0000 0000 0000 0000 Word 6 0000 0000 0000 0000 0000 0000
1111
Word 9 1111 1111 1111 1111 1111 1111 Word 10 1111 1111 1111 1111 1111 1100
3 Byte 1 Byte 2 Byte 3
Word 7 0000 0000 0000 0000 1111 1111 Word 8 1111 1111 1111 1111 1111
Subframe 2: Byte 1 Byte 2 Byte
Word 3 1111 1111 1111 1111 1111 1111 Word 4 1111 1111 1111 1111 1111 1111
Word 5 1111 1111 1111 1111 1111 1111 Word 6 1111 1111 1111 1111 1111 1111
Word 7 1111 1111 1111 1111 1111 1111 Word 8 1111 1111 1111 1111 1111 1111
Word 9 1111 1111 1111 1111 1111 1111 Word 10 1111 1111 1111 1111 0000 0000
Subframe 3: Byte 1 Byte 2 Byte 3 Byte 1 Byte 2 Byte 3
Word 3 1111 1111 1111 1111 1111 1111 Word 4 1111 1111 1111 1111 1111 1111
Word 5 1111 1111 1111 1111 1111 1111 Word 6 1111 1111 1111 1111 1111 1111
1111 1111 Word 8 1111 1111 1111 1111 1111 1111
111 1111 1111 1111 1111 Word 10 1111 1111 1111 1111 1111 1100
Word 7 1111 1111 1111 1111
Word 9 1111 1
Table B-65. GLONASS satellite ephemeris mask
String 1:
0 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111
1111 1111 1111 1111 1111 1111 1111 0000 0000
String 2:
0 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111
1111 1111 1111 1111 1111 1111 1111 0000 0000
String 3:
0 0000 0111 1111 1111 0000 1111 1111 1111 1111 1111 1111 1111
1111 1111 1111 1111 1111 1111 1111 0000 0000
String 4:
0 0000 1111 1111 1111 1111 1111 1100 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000
Coding: 1 to 36 = GPS satellite IDs (PRN)
37 = reserved
38 to 61 = GLONASS satellite IDs (slot number plus 37)
62 to 119 = spare
120 to 138 = SBAS satellite IDs (PRN)
139 to 255 = spare
Issue of data (IOD): The issue of data associated with the ephemeris data used to determine pseudo-range and range rate
corrections.
APP B-85 23/11/06
Annex 10 — Aeronautical Communications Volume I
Coding: for GPS, IOD = GPS IODE parameter (3.1.1.3.2.2)
for GLONASS, IOD = GLONASS “tb” parameter (see 3.2.1.3.1)
for SBAS, IOD = 1111 1111
Note.— For GLONASS insert 0 in the MSB of the IOD.
seudo-range correction (PRC): the correction to the ranging source pseudo-range.
ange rate correction (RRC): the rate of change of the pseudo-range correction.
pr_gnd e ution associated with the signal-in-space contribution of the pseudo-range
error at 6.5.5.2 and 3.6.7.2.2.4).
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