ZED-F9T-Integration Manual
3.8.1.2 GPS
The data structure in the GPS L1C/A and L2C signals is dissimilar and thus the UBX-RXM-SFRBX
message structure differs as well. For the GPS L1C/A and L2C signals it is as follows:
3.8.1.2.1 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 22: GPS L1C/A subframe word
3.8.1.2.2 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 23: GPS L2C subframe words
3.8.1.3 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-19005590 - R01
3 Receiver functionality Page 49 of 80
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