NEO-M9N - Integration manual
Alert pages are reported in very similar manner, but the page type bits will have value 1 and the
structure of the eight words will be slightly different (as indicated by the Galileo ICD).
3.15.1.6 SBAS
For SBAS (L1C/A) signals each reported subframe contains eight 32-bit data words to deliver the
250 bits transmitted in each SBAS data block.
The eight words are arranged as follows:
Figure 29: SBAS subframe words
3.15.1.7 QZSS
The structure of the data delivered by QZSS L1C/A signals is effectively identical to that of GPS
(L1C/A).
3.15.1.8 Summary
The following table gives a summary of the different data message formats reported by the UBX-
RXM-SFRBX message:
GNSS
Signal
gnssId
sigId
numWords
period
GPS
L1C/A
0
0
10
6s
Galileo
E1 B
2
1
8
2s
BeiDou
B1I D1
3
0
10
6s
BeiDou
B1I D2
3
1
10
0.6s
QZSS
L1C/A
5
0
10
6s
GLONASS
L1OF
6
0
3
2s
Table 24: Data message formats reported by UBX-RXM-SFRBX
3.16 Forcing a receiver reset
Typically, in GNSS receivers, a distinction is made between cold, warm, and hot start, depending on
the type of valid information the receiver has at the time of the restart.
•
Cold start:
In cold start mode, the receiver has no information from the last position (e.g.
time, velocity, frequency etc.) at startup. Therefore, the receiver must search the full time and
UBX-19014286 - R07
3 Receiver functionality
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