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MA
n 2 6, 8, 10, 12, 14 78 – 79
– 15
5, 7, 9, 11, 13, 15, 20, 9
22, 24, 26, 28, 30, 35,
7, 39, 41, 43, 45, 50
52, 54, 56, 58, 60,
, 67, 69, 71, 73, 7
3, 18, 33, 48, 63 65
B1 11 74 (within the superframe) 70 – 80
B2 10 74 (within the superframe) 60 – 69
KP 2 ithin the superfra 58 – 59
NT 11 4, 19, 34, 49, 64 16 – 26
N4 5 5, 20, 35, 50, 65 32 – 36
FT 4 4, 19, 34, 49, 64 30 – 33
M 2 4, 19, 34, 49, 64
P4 1 4, 19, 34, 49, 64 34
P 2 3, 18, 33, 48, 63 66 – 67
ιGPS 22 5, 20, 35, 50, 65 10 – 31
Table B-19. Almanac part ion within the superframe
within the superframe
Sate is
transmitted within given frame
it
Frame number llite numbers, for which almanac
1 1 to 5
2 6 to 10
3 11 to 15
4 16 to 20
5 21 to 24
APP B-27 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table B-20. Almanac parameters coding
Parameter
Number
of bits
Scale factor
(LSB) Effective range Units
MA
n 2 1 0 to 3 dimensionless
τc 28 2–27 ±1 seconds
NA 11 1 1 to 1 461 days
nA 5 1 1 to 24 dimensionless
HA
n 5 1 0 to 31 dimensionless
λA
n 21 2–20 ±1 semi-circles
tλA
n 21 2–5 0 to 44 100 seconds
ΔiA
n 18 2–20 ±0.067 semi-circles
ΔTA
n 22 2–9 ±3.6 × 103 seconds/revolution
ΔT A
n 7 2–14 ±2–8 seconds/revolution2
εA
n 15 2–20 0 to 0.03 dimensionless
ωA
n 16 2–15 ±1 semi-circles
tτA
n 10 2–18 ±1.9 × 10–3 seconds
CA
n 1 1 0 to 1 dimensionless
Table B-21. Arrangement of almanac parameters within the frame
Parameter
Number
of bits
String number
within the frame
Bit number
within the string
MAn 2 6, 8, 10, 12, 14 78 – 79
τc
N
28 5 42 – 69
A 11 5 70 – 80
nA 5 6, 8, 10, 12, 14 73 – 77
HAn 5 7, 9, 11, 13, 15 10 – 14
λA
n 21 6, 8, 10, 12, 14 42 – 62
tλA
n
Δi
21 7, 9, 11, 13, 15 44 – 64
A
n 18 6, 8, 10, 12, 14 24 – 41
ΔTA
n 22 7, 9, 11, 13, 15 22 – 43
ΔT A
n 7 7, 9, 11, 13, 15 15 – 21
εA
n 15 6, 8, 10, 12, 14 9 – 23
ωA
n 16 7, 9, 11, 13, 15 65 – 80
tτA
n
C
10 6, 8, 10, 12, 14 63 – 72
A
n 1 6, 8, 10, 12, 14 80
Note.— String numbers of the first four frames within superframe are given. There are no
almanac parameters in 14th and 15th strings of 5th frame.
3.2.2 DEFINITIONS OF PROTOCOLS FOR DATA APPLICATION
Note.— This section defines the inter-relationships of the data broadcast message parameters. It provides definitions of
parameters that are not transmitted, but are used by either or both non-aircraft and aircraft elements, and that define terms
applied to determine the navigation solution and its integrity.
23/11/06 APP B-28
Appendix B Annex 10 — Aeronautical Communications
Table B-22. Parity checking algorithm
b85, b84, …, b10, b9 are the data bits (position 9 to 85 in the string);
β1, β2, ..., ß8 are the check bits of the Hamming code (positions 1 to 8 in the string);
c1, c2, ..., c7, cΣ are the checksums generated using the following:
c1 = β ⊕ [Σi bi]mod 2
i = 9, 10, 12, 13, 15, 17, 19, 20, 22, 24, 26, 28, 30, 32, 34, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53,
55, 57, 59, 61, 63, 65, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84.
c2 = β 2 ⊕ [Σj bj]mod 2
j = 9, 11, 12, 14, 15, 18, 19, 21, 22, 25, 26, 29, 30, 33, 34, 36, 37, 40, 41, 44, 45, 48, 49, 52, 53,
56, 57, 60, 61, 64, 65, 67, 68, 71, 72, 75, 76, 79, 80, 83, 84.
c3 = β 3 ⊕ [Σk bk ]mod 2
k = 10, 11, 12, 16, 17, 18, 19, 23, 24, 25, 26, 31, 32, 33, 34, 38, 39, 40, 41, 46, 47, 48, 49, 54, 55,
56, 57, 62, 63, 64, 65, 69, 70, 71, 72, 77, 78, 79, 80, 85.
c4 = β 4 ⊕ [Σl bl]mod 2
l = 13, 14, 15, 16, 17, 18, 19, 27, 28, 29, 30, 31, 32, 33, 34, 42, 43, 44, 45, 46, 47, 48, 49, 58, 59,
60, 61, 62, 63, 64, 65, 73, 74, 75, 76, 77, 78, 79, 80.
c5 = β 5 ⊕ [Σm bm ]mod 2
m = 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 65, 81, 82, 83, 84, 85.
c6 = β 6 ⊕ [Σn bn]mod 2
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