124 G12 OEM Board & Sensor Reference Manual
The MBN message is output in binary format according to the setting chosen for the recording
interval ($PASHS,RCI). One MBN message is output for each locked satellite with an elevation equal
Table 4.60. $PASHR,MBN Data String, Ashtech Type 2
Field Bytes Content
char 1 Always 1
unsigned char 1 Number of remaining structures to be sent for current epoch
unsigned char 1 Satellite PRN number (1 - 56)
unsigned char 1 Channel ID (1 - 12)
long 4 Lost lock counter: continuous counts since satellite was locked
char 1 Polarity known: 0 or 5
0 = SV just locked
5 = beginning of the (1st-5th) subframe was found (i.e., phase
measurements can be used for ambiguity fixing.
unsigned char 1 Goodbad indicates quality of the position measurement
0 = measurements not available and no additional data will be sent
21 = Satellite was NOT used because of low elevation
22 = Satellite was NOT used because of any reason except low elevation
(e.g. satellite is unhealthy, no differential corrections, satellite is manually
disabled, etc.)
23 = code and/or carrier phase measured and navigation measurement was
obtained, but measurement was not used to compute position
24 = code and/or carrier phase measured and navigation measurement was
obtained, and measurement was used to compute position
unsigned char 1 Warning flag (see Table 4.61 below)
unsigned char 1 Signal-to-noise ratio of satellite observation
double 8 Raw_range The fractional part of the satellite transmit time
long 4
Satellite Doppler measurement (10
-4
Hz)
double 8 Full phase
unsigned short 2 Carphase1 not available
unsigned short 2 Carphase2 not available
unsigned short 2 Satellite elevation in units of 0.01 degrees
unsigned short 2 Satellite azimuth in degrees
unsigned short 2 Checksum. Computed by adding all two-byte words in a message structure,
and taking the least significant 16 bits of the result. Message structure starts
just after header and goes to the byte before checksum.
Total byte s 42
G12RevD.book Page 124 Tuesday, April 2, 2002 4:33 PM
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