ZED-F9P-Integration Manual
UBX-18010802 - R02

4 Receiver description Page 46 of 114
Advance Information
Figure 29: Glonass subframe words
In some circumstances, (especially on startup) the receiver may be able to decode data from a
GLONASS SV before it can identify the SV. When this occurs UBX-RXM-SFRBX messages will be
issued with an svId of 255 to indicate "unknown".
4.7.4 BeiDou
For BeiDou B1I D1, B1I D2, B2I D1, B2I D2 signals, there is a fairly straightforward mapping between
the reported subframe and the structure of subframe and words described in the BeiDou ICD. Each
subframe comprises ten data words, which are reported in the same order they are received.
Each word is arranged as follows:
Figure 30: BeiDou subframe word
Note that as the BeiDou data words only comprise 30 bits, the 2 most significant bits in each word
reported by UBX-RXM-SFRBX are padding and should be ignored.
4.7.5 Galileo
The Galileo E1 C/B and E5 bl/bQ signals both transmit the I/NAV message but in different
configurations. The UBX-RXM- SFRBX structures for them are as follows.
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