Glonass almanac, Table 107: glonass alm1b binary message data – NavCom Sapphire Rev.J User Manual
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2.3.2 GLONASS Almanac
This record contains the packed almanac data for 24 GLONASS satellites. The almanac
for each satellite contains two strings. Table 107 lists the message structure.
Table 107: GLONASS ALM1B Binary Message Data
Data Item (600 Bytes)
Data Type
String 5 of GLONASS time information
(3 words * 4 bytes, in the order of word 0, word 1, word 2)
12 bytes
String 14 of GLONASS time information
(3 words * 4 bytes)
12 bytes
Even string (3 words * 4 bytes) for satellite 1
12 bytes
Odd string (3 words * 4 bytes) for satellite 1
12 bytes
...
...
Even string (3 words * 4 bytes) for satellite 24
12 bytes
Odd string (3 words * 4 bytes) for satellite 24
12 bytes
The data bits [84, 83...53] within the string are stored in word 0. The MSB is bit 84.
The data bits [52, 52...21] within the string are stored in word 1. The MSB is bit 52.
The data bits [20, 19...1 ] within the string are stored in word 2. The LSB is bit 1.