76
AID – EPH (0x0B 0x31)
It’s a poll request when “data length” is equal to 0. Poll all available aiding ephemeris
data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 0x31 0 None CK_A CK_B
AID – EPH (0x0B 0x31)
It’s also a poll request. Poll a specific aiding ephemeris data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 0x31 1 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U1 PRN number This will request the desired
almanac data for the specific
GPS satellite
AID – EPH (0x0B 0x31)
It’s an I/O message. Poll aiding almanac data.
Header ID Data Length Data Checksum
0xB5 0x62 0x0B 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
