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4 1 – 24
5 1 – 24
6 1 – 24
7 1 – 16
23/11/06 APP B-6
Appendix B Annex 10 — Aeronautical Communications
Table B-5. Ephemeris data
M0 Mean anomaly at reference time
Δn Mean motion difference from computed value
e Eccentricity
A Square root of the semi-major axis
OMEGA0 Longitude of ascending node of orbit plane at weekly epoch
i0 Inclination angle at reference time
ω Argument of perigee
OMEGADOT Rate of right ascension
iDOT Rate of inclination angle
Cuc Amplitude of the cosine harmonic correction term to the argument of latitude
Cus Amplitude of the sine harmonic correction term to the argument of latitude
Crc Amplitude of the cosine harmonic correction term to the orbit radius
Crs Amplitude of the sine harmonic correction term to the orbit radius
Cic Amplitude of the cosine harmonic correction term to the angle of inclination
Cis Amplitude of the sine harmonic correction term to the angle of inclination
toe Reference time, ephemeris
IODE Issue of data, ephemeris
Table B-6. Ephemeris parameters
Parameter
Number
of bits**
Scale factor
(LSB)
Effective
range*** Units
IODE 8
Crs 16* 2–5 metres
Δn 16* 2–43 semi-circles/second
M0 32* 2–31 semi-circles
Cuc 16* 2–29 radians
e 32 2–33 0.03 dimensionless
Cus 16* 2–29 radians
A 32 2–19 metres1/2
toe 16 24 604 784 seconds
Cic 16* 2–29 radians
OMEGA0 32* 2–31 semi-circles
Cis 16* 2–29 radians
i0 32* 2–31 semi-circles
Crc 16* 2–5 metres
ω 32* 2–31 semi-circles
OMEGADOT 24* 2–43 semi-circles/second
iDOT 14* 2–43 semi-circles/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.
APP B-7 23/11/06
Annex 10 — Aeronautical Communications Volume I
Note 1.— The IODE/IODC terms provide the receiver with a means for detecting any changes in the ephemeris/clock
representation parameters.
Note 2.— The first data set may change (3.1.1.2.2) at any time during the hour and therefore may be transmitted by the
satellite for less than 1 hour.
3.1.1.3.2.3 Reserved data fields. Within word 10, subframe 2, bits 17 through 22 shall be reserved. Reserved data fields
shall support the valid parity within their respective words.
3.1.1.3.3 Subframes 4 and 5 — support data. Both subframes 4 and 5 shall be subcommutated 25 times each. With the
possible exception of “reserved” pages and explicit repeats, each page shall contain different data in words 3 through 10. The
pages of subframe 4 shall use 6 different formats, and the pages of subframe 5 shall use two different formats as indicated in
Figure B-6.
Pages of subframe 4 shall be as follows:
a) Pages 2, 3, 4, 5, 7, 8, 9 and 10: almanac data for satellites 25 through 32 respectively. If the 6-bit health status word
of page 25 is set to 6 “ones” (3.1.1.3.3.4) then the satellite ID of the page shall not have a value in the range of 25
through 32;
Note.— These pages may be designed for other functions. The format and content for each page is defined by
the satellite ID of that page.
b) Page 17: special messages;
c) Page 18: ionospheric and UTC data;
d) Page 25: satellite configurations for 32 satellites; and
e) Pages 1, 6, 11, 12, 13, 14, 15, 16, 19, 20, 21, 22, 23 and 24: reserved.
Pages of subframe 5 shall be as follows:
a) Pages 1 through 24: almanac data for satellite 1 through 24; and
b) Page 25: satellite health data for satellite 1 through 24, the almanac reference time and the almanac reference week
number.
3.1.1.3.3.1 Data ID. The two MSBs of word 3 in each page shall contain the data ID that defines the applicable GPS
navigation data structure. The data ID shall be as indicated in Table B-7 in accordance with the following:
a) for those pages which are assigned to contain the almanac data of one specific satellite, the data ID shall define the
data structure utilized by that satellite whose almanac data are contained in that page;
b) for all other pages, the data ID shall denote the data structure of the transmitting satellite; and
c) data ID “1” (denoted by binary state 00) shall not be used.
3.1.1.3.3.2 Satellite ID. The satellite ID shall be provided by bits 3 through 8 of word 3 in each page. The satellite IDs
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