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shall be utilized two ways:
a) for those pages which contain the almanac data of a given satellite, the satellite ID shall be the same number that is
assigned the PRN code phase of that satellite in accordance with Table B-1; and
23/11/06 APP B-8
Appendix B Annex 10 — Aeronautical Communications
b) for all other pages the satellite ID assigned in accordance with Table B-7 shall serve as the “page ID”. IDs 1 through
32 shall be assigned to those pages which contain the almanac data of specific satellites (pages 1 through 24 of
subframe 5 and pages 2 through 5, and 7 through 10 of subframe 4). The “0” ID (binary all zeros) shall be assigned
to indicate a dummy satellite, while IDs 51 through 63 shall be utilized for pages containing other than almanac data
for a specific satellite (Notes 1 and 2).
Note 1.— Specific IDs are reserved for each page of subframes 4 and 5; however, the satellite ID of pages 2, 3, 4, 5, 7, 8,
9 and 10 of subframe 4 may change for each page to reflect the alternate contents for that page.
Note 2.— The remaining IDs (33 through 50) are unassigned.
Table B-7. Data IDs and satellite IDs in subframes 4 and 5
Subframe 4 Subframe 5
Page Data ID Satellite ID* Data ID Satellite ID*
1 *** 57 ** 1
2**** ** 25 ** 2
3**** ** 26 ** 3
4**** ** 27 ** 4
5**** ** 28 ** 5
6 *** 57 ** 6
7**** ** 29 ** 7
8**** ** 30 ** 8
9**** ** 31 ** 9
10**** ** 32 ** 10
11 *** 57 ** 11
12 *** 62 ** 12
13 *** 52 ** 13
14 *** 53 ** 14
15 *** 54 ** 15
16 *** 57 ** 16
17 *** 55 ** 17
18 *** 56 ** 18
19 *** 58***** ** 19
20 *** 59***** ** 20
21 *** 57 ** 21
22 *** 60***** ** 22
23 *** 61***** ** 23
24 *** 62 ** 24
25 *** 63 *** 51
* “0” indicates “dummy” satellite. When using “0” to indicate a dummy satellite, the data ID of the transmitting satellite is
used.
** Data ID of that satellite whose satellite ID appears in that page.
*** Data ID of transmitting satellite.
**** Pages 2, 3, 4, 5, 7, 8, 9 and 10 of subframe 4 may contain almanac data for satellites 25 through 32, respectively, or data
for other functions as identified by a different satellite ID from the value shown.
***** Satellite ID may vary.
APP B-9 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.1.1.3.3.3 Almanac. Pages 1 through 24 of subframe 5, as well as pages 2 through 5 and 7 through 10 of subframe 4
shall contain the almanac data and a satellite health status word (3.1.1.3.3.4) for up to 32 satellites. The almanac data shall be
a reduced-precision subset of the clock and ephemeris parameters. The data shall occupy all bits of words 3 through 10 of
each page except the 8 MSBs of word 3 (data ID and satellite ID), bits 17 through 24 of word 5 (satellite health), and the
50 bits devoted to parity. The number of bits, the scale factor (LSB), the range and the units of the almanac parameters shall
be as indicated in Table B-8. The almanac message for any dummy satellite shall contain alternating “ones” and “zeros” with
a valid parity.
3.1.1.3.3.3.1 Almanac reference time. The almanac reference time, toa, shall be a multiple of 212 seconds occurring
approximately 70 hours after the first valid transmission time for this almanac data set. The almanac shall be updated often
enough to ensure that GPS time, t, will differ from toa by less than 3.5 days during the transmission period. The almanac
parameters shall be updated at least once every 6 days during normal operations.
3.1.1.3.3.3.2 Almanac time parameters. The almanac time parameters shall consist of an 11-bit constant term (af0) and
an 11-bit first order term (af1).
3.1.1.3.3.3.3 Almanac reference week. Bits 17 through 24 of word 3 in page 25 of subframe 5 shall indicate the number of
the week (WNa) to which the almanac reference time (toa) is referenced. The WNa term shall consist of the 8 LSBs of the full
week number. Bits 9 through 16 of word 3 in page 25 of subframe 5 shall contain the value of toa that is referenced to this WNa.
3.1.1.3.3.4 Health summary. Subframes 4 and 5 shall contain two types of satellite health data:
a) each of the 32 pages that contain the clock/ephemeris related almanac data shall provide an 8-bit satellite health
status word regarding the satellite whose almanac data they carry; and
b) the 25th pages of subframes 4 and 5 jointly shall contain 6-bit health data for up to 32 satellites.
3.1.1.3.3.4.1 The 8-bit health status words shall occupy bits 17 through 24 of word 5 in those 32 pages that contain the
almanac data for individual satellites. The 6-bit health status words shall occupy the 24 MSBs of words 4 through 9 in page 25
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