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of subframe 5, and bits 19 through 24 of word 8, the 24 MSBs of word 9, and the 18 MSBs of word 10 in page 25 of subframe 4.
Table B-8. Almanac parameters
Parameter
Number
of bits**
Scale factor
(LSB)
Effective
range*** Units
e 16 2–21 dimensionless
toa 8 212 602 112 seconds
δi
**** 16* 2–19 semi-circles
OMEGADOT 16* 2–38 semi-circles/second
A 24* 2–11 metres1/2
OMEGA0 24* 2–23 semi-circles
ω 24* 2–23 semi-circles
M0 24* 2–23 semi-circles
af0 11* 2–20 seconds
af1 11* 2–38 seconds/second
* Parameters so indicated are two’s complement, with the sign bit (+ or –) occupying the MSB.
** See Figure B-6 for complete bit allocation in subframe.
*** Unless otherwise indicated in this column, effective range is the maximum range attainable with the indicated bit
allocation and scale factor.
**** Relative to i0 = 0.30 semi-circles.
23/11/06 APP B-10
Appendix B Annex 10 — Aeronautical Communications
3.1.1.3.3.4.2 The 3 MSBs of the 8-bit health status words shall indicate health of the navigation data in accordance
with the code given in Table B-9. The 6-bit words shall provide a 1-bit summary of the navigation data’s health status in the
MSB position in accordance with 3.1.1.3.1.3. The 5 LSBs of both the 8-bit and the 6-bit health status words shall provide the
health status of the satellite’s signal components in accordance with the code given in Table B-10.
Table B-9. Navigation data health indication
Bit position in page
137 138 139 Indication
0 0 0 ALL DATA OK
0 0 1 PARITY FAILURE — some or all parity bad
0 1 0 TLM/HOW FORMAT PROBLEM — any departure from standard format
(e.g. preamble misplaced and/or incorrect), except for incorrect Z-count, as reported
in HOW
0 1 1 Z-COUNT in HOW BAD — any problem with Z-count value not reflecting
actual code phase
1 0 0 SUBFRAMES 1, 2, 3 — one or more elements in words 3 through 10 of one or
more subframes are bad
1 0 1 SUBFRAMES 4, 5 — one or more elements in words 3 through 10 of one or
more subframes are bad
1 1 0 ALL UPLOADED DATA BAD — one or more elements in words 3 through 10
of any one (or more) subframes are bad
1 1 1 ALL DATA BAD — TLM word and/or HOW and one or more elements in any
one (or more) subframes are bad
Table B-10. Codes for health of satellite signal components
MSB LSB Indication
0 0 0 0 0 ALL SIGNALS OK
1 1 1 0 0 SATELLITE IS TEMPORARILY OUT — do not use this satellite
during current pass ___
1 1 1 0 1 SATELLITE WILL BE TEMPORARILY OUT — use with caution ___
1 1 1 1 0 SPARE
1 1 1 1 1 MORE THAN ONE COMBINATION WOULD BE REQUIRED TO
DESCRIBE ANOMALIES, EXCEPT THOSE MARKED BY ___
All other combinations SATELLITE EXPERIENCING CODE MODULATION AND/OR
SIGNAL POWER LEVEL TRANSMISSION PROBLEMS. The user
may experience intermittent tracking problems if satellite is acquired.
APP B-11 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.1.1.3.3.4.3 A special meaning shall be assigned, to the 6 “ones” combination of the 6-bit health status words in the
25th pages of subframes 4 and 5; it shall indicate that “the satellite which has that ID is not available and there may be no
data regarding that satellite in the page of subframe 4 or 5 that is assigned to normally contain the almanac data of that
satellite”.
Note.— This special meaning applies to the 25th pages of subframes 4 and 5 only. There may be data regarding another
satellite in the almanac page referred to above as defined in 3.1.1.3.3.3.
3.1.1.3.3.4.4 The health indication shall be provided relative to the capabilities of each satellite as designated by the
configuration code in 3.1.1.3.3.5. Accordingly, any satellite that does not have a certain capability shall be indicated as
“healthy” if the lack of this capability is inherent in its design or it has been configured into a mode which is normal from a
receiver standpoint and does not require that capability. The predicted health data shall be updated at the time of upload.
Note 1.— The transmitted health data may not correspond to the actual health of the transmitting satellite or other
satellites in the constellation.
Note 2.— The data given in subframes 1, 4 and 5 of the other satellites may differ from that shown in subframes 4 and/or
5 since the latter may be updated at a different time.
3.1.1.3.3.5 Satellite configuration summary. Page 25 of subframe 4 shall contain a 4-bit-long term for each of up to
32 satellites to indicate the configuration code of each satellite. These 4-bit terms shall occupy bits 9 through 24 of words 3,
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