RCB-F9T - Integration manual
3.10.1.2.1 GPS L1C/A
For GPS L1C/A signals, there is a fairly straightforward mapping between the reported subframe
and the structure of subframe and words described in the GPS ICD. Each subframe comprises ten
data words, which are reported in the same order they are received.
Each word is arranged as follows:
Figure 11: GPS L1C/A subframe word
3.10.1.2.2 GPS L2C
For GPS L2C signals each reported subframe contains the CNAV message as described in the GPS
ICD. The ten words are arranged as follows:
Figure 12: GPS L2C subframe words
3.10.1.3 GLONASS
For GLONASS L1OF and L2OF signals, each reported subframe contains a string as described in the
GLONASS ICD. This string comprises 85 data bits which are reported over three 32-bit words in the
UBX-RXM-SFRBX message. Data bits 1 to 8 are always a hamming code, whilst bits 81 to 84 are a
UBX-19003747 - R04
3 Receiver functionality
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Early production information
