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RXM – SFRB (0x02 0x11)
It periodically outputs the data in the subframe of navigation message.
Header ID Data Length Data Checksum
0xB5 0x62 0x02 0x11 42 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U1 Channel number
1 U1 PRN number
2 I4 WORD0
6 I4 WORD1
10 I4 WORD2
14 I4 WORD3
18 I4 WORD4
22 I4 WORD5
26 I4 WORD6
30 I4 WORD7
34 I4 WORD8
38 I4 WORD9
NOTE: For GPS satellites, each word contains the parity checked subframe data in
24 bits (Bits 23 ~ 0) and the rest of 8 bits in each word are undefined. The higher
order bits receive data first. For more information about GPS navigation message,
please refer to the documentation ICD-GPS-200.
For SBAS satellites, the first 7 words (WORD0 ~ WORD6) contain 224 bits of data
for the 250 bit message block. The rest of 26-bit data are contained in Bits 25 ~ 0 of
WORD7, where Bit 25 is last bit of the data. For more information about SBAS,
please refer to RTCA/DO-229C (MOPS).