ZED-F9P-Integration Manual
UBX-18010802 - R02
4 Receiver description Page 45 of 114
Advance Information
Figure 28: GPS L2C subframe words
4.7.3 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 string number and bit 85 is the idle chip, which should always have a value of zero. The meaning
of other bits vary with string and frame number.
The fourth and final 32 bit word in the UBX-RXM-SFRBX message contains frame and superframe
numbers (where available). These values aren't actually transmitted by the SVs, but are deduced by
the receiver and are included to aid decoding of the transmitted data. However, the receiver does
not always know these values, in which case a value of zero is reported.
The four words are arranged as follows:
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