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where
k = the number of bits in the particular CRC;
M(x) = the information field, which consists of the data items to be protected by the particular CRC represented as a
polynomial;
G(x) = the generator polynomial specified for the particular CRC;
Q(x) = the quotient of the division; and
R(x) = the remainder of the division, contains the CRC:
k
Table B-84. In ke interference
to GPS and SBAS receivers for precision approach
Interference bandwidth Interference threshold
k
k i k 1 k 2 0
i 1 2
i 1
R(x) r x − r x − r x − r x
=
=Σ = + +…+
terference threshold for band-limited noise-li
used
0 H 0 Hz 50.5 dBW
700 10 k –150 dBW
10 100 43 ) dBW
100 ≤ 1 M –140
1 M 20 MHz e
20 MH 30 MHz Line *
30 M ≤ 40 MH Linear
40 119
* The interference threshold is not to exceed –140.5 dBW Hz in the frequency range 1 575.42 ±10 MHz.
z < Bwi ≤ 70 –1
Hz < Bwi ≤ Hz .5 + 6 log10(BW/700)
kHz < Bwi ≤ kHz
Hz
–1 .5 + 3 log10(BW/10000
kHz < Bwi
Hz < Bw ≤
.5 dBW
arly increasing from –140.5 to –127.5 dBW*
arly increasing from –127.5 to –121.1 dBW
i Lin
z < Bwi ≤
Hz < Bwi
MH
z ly increasing from –121.1 to –119.5 dBW*
z < Bwi – .5 dBW*
/M
Table B-85. Interference threshold for band-limited noise-like interference
to GLONASS receivers used for precision approach
Interference bandwidth Interference threshold
0 Hz < Bwi ≤ 1 kHz –149 dBW
1 kHz < Bwi ≤ 10 kHz Linearly increasing from –149 to –143 dBW
10 kHz < Bwi ≤ 0.5 MHz –143 dBW
0.5 MHz < Bwi ≤ 10 MHz Linearly increasing from –143 to –130 dBW
10 MHz < Bwi –130 dBW
23/11/06 APP B-124
Appendix B Annex 10 — Aeronautical Communications
Table B-86. Interference thresholds for pulsed interference
GPS and SBAS GLONASS
Frequency range 1 575.4 ± 10 MHz 1 592.9525 MHz to 1 609.36 MHz
Interference threshold (Pulse peak power) –10 dBW
Pulse width ≤125 μs, ≤1 ms* ≤1 ms
Pulse duty cycle ≤10% ≤10%
* Applies to GPS receivers without SBAS.
2 MHz
–10 dBW
Table B-87. Minimum antenna gain — GPS/SBAS and GLONASS
Elevation angle degrees Minimum gain dBic
0 –7.5
5 –4.5
10 –3
15 to 90 –2
APP B-125 23/11/06
Annex 10 — Aeronautical Communications Volume I
Figure B-1. C/A code timing relationships
SUBFRAME 1 TLM HOW GPS week number, SV accuracy and health
SUBFRAME 2 TLM HOW Ephemeris parameters
SUBFRAME 3 TLM HOW Ephemeris parameters
SUBFRAME 4
(25 pages)
TLM HOW Almanac and health for satellites 25–32, special messages,
satellite configuration, flags, ionospheric and UTC
SUBFRAME 5
(25 pages)
TLM HOW Almanac and health for satellites 1–24 and almanac reference
time and GPS week number
Figure B-2. Frame structure
20 ms
X1 Epoch 2/3 bps
1 023 1 023 1 023 1 023 etc.
0 1 2 18 19 0
Gold Code Epochs
(1 000 per second)
1 023-bit Gold Code (1 023 Kbps)
Data (50 cps)
1 ms
23/11/06 APP B-126
Appendix B Annex 10 — Aeronautical Communications
Preamble Reserved Parity
1 0 0 0 1 0 1 1 MSB LSB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Figure B-3. TLM word format
Figure B-4. HOW format
End/start of week → ←1.5 s
403 192 403 196 0 1 2 3 4 5 6 7
Decimal equivalent of actual TOW counts
→ Subframe epochs ← → 6 s ←
100 799 0 1 2
Decimal equivalent of HOW message TOW count
Notes:
1. To aid in rapid ground lock-on, the HOW of each subframe contains a truncated TOW count.
2. The HOW is the second word in each subframe.
3. The HOW message TOW count consists of the 17 MSBs of the actual TOW count at the start of the next subframe.
4. To convert from the HOW message TOW count to the actual count at the start of the next subframe, multiply by four.
5. The first subframe starts synchronously with the end/start of each epoch.
Figure B-5. Time line relationship of HOW
Subframe Parity
ID
TOW count message
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
APP B-127 23/11/06
Annex 10 — Aeronautical Communications Volume I
*** RESERVED
P = 6 PARITY BITS
t = 2 NON-INFORMATION BEARING BITS USED FOR PARITY COMPUTATION
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