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RXM – EPH (0x02 0x31)
It’s an input request for polling ephemeris data. The receiver responds with all
available RXM-EPH messages defined below.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x31 0 None CK_A CK_B
RXM – EPH (0x02 0x31)
It’s an input request for polling ephemeris data of one specific SV. The receiver
responds with a RXM-EPH message defined below.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x31 1 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U1 PRN number 1 ~ 32
RXM – EPH (0x02 0x31)
It’s an output message that carries almanac data of one specific SV.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x31 8+n*96 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 PRN number The following data are for this
specific satellite
4 U4 Hand-Over Word (HOW) of the
first sub-frame
0 – invalid ephemeris data
The following data will be repeated n times (n: number of valid ephemerides).
8+n*96 U4 Sub-frame 1 – WORD0
12+n*96 U4 Sub-frame 1 – WORD1
16+n*96 U4 Sub-frame 1 – WROD2
20+n*96 U4 Sub-frame 1 – WORD3
24+n*96 U4 Sub-frame 1 – WORD4
28+n*96 U4 Sub-frame 1 – WORD5
32+n*96 U4 Sub-frame 1 – WORD6