GLONASS almanac report
The GLONASS almanac report is sent when Command Packet 54h is used to request the almanac for one GLONASS satellite or all GLONASS satellites. The Command Packet 54h SUBTYPE byte (byte 4) is set to eight (8) when requesting the report.
The following table shows the additional records provided in Report Packet 55h when GLONASS almanac data is included.
|
Subtype 8: GLONASS almanac |
||||
|---|---|---|---|---|
|
Byte |
Item |
Type |
Value |
Meaning |
|
6–7 |
DAY NUMBER |
2 (word) |
|
Day number within the current 4-year cycle. |
|
8 |
FDMA NUMBER |
1 (byte) |
-7 to 13 |
(signed char) FDMA channel number |
|
9–16 |
ECCENTRICITY |
8 (double) |
|
|
|
17–24 |
ARG OF PERIGEE |
8 (double) |
radians |
Argument of Perigee |
|
25–32 |
ORBIT PERIOD |
8 (double) |
seconds |
|
|
33–40 |
ORBITAL PERIOD CORRECTION |
8 (double) |
|
|
|
41–48 |
LONG FIRST ASCENDING NODE |
8 (double) |
|
Longitude of the first ascending node |
|
49–56 |
TIME ASCENDING NODE |
8 (double) |
|
|
|
57–64 |
INCLINATION |
8 (double) |
radians |
Inclination is in |
|
65–72 |
A0 |
8 (double) |
seconds |
Satellite clock offset from system time |
|
73 |
HEALTH |
1 (byte) |
|
|
|
---------- End of Subtype 8 ---------- |
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