ashtech DG14, Reference Manual

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Raw Data Commands 205
Raw Dat
a Commands
unsigned short
VDOP 2 VDOP multiplied by 100.
unsigned short
ModZCnt 2 Modified Z-count (with a resolution of 0.2 seconds and an
acceptable range of 20 minutes) from the RTCA Type 1 message
containing the differential corrections used in the position
computation.
float GloTimeShift 4 Current GLONASS time shift relative to GPS time in
microseconds, ranging from 0.0000 to +/-5000000.0000us.
unsigned long
GpsNavFlags 4 Each bit is a “GPS Nav Flag” for a GPS satellite. The most
significant bit corresponds to PRN 32. When navigation data is
collected from a GPS satellite, a GPS Nav Flag bit is set for any
of the following reasons:
• User Range Accuracy (URA) Flag (“accuracy alert”, bit 18 of
the Hand-Over-Word (HOW)) is set (ref. paragraph 2.4.2.2 of
GPS SPS Signal Specification);
• Failure of parity on 3 successive words of the navigation data;
• All data bits in subframe 1, 2 or 3 are 0’s;
• Default navigation data (alternate 1’s and 0’s) is transmitted in
words 3 through 10 of subframe 1, 2 or 3 for that satellite (ref.
paragraph 2.4.1.3 of GPS SPS Signal Specification).
signed short
GeoidalSeparation 2 Geoidal separation in meters multiplied by 100.
unsigned short
HDOP 2 HDOP multiplied by 100.
unsigned short
VDOP 2 VDOP multiplied by 100.
unsigned short
ModZCnt 2 Modified Z-count (with a resolution of 0.2 seconds and an
acceptable range of 20 minutes) from the RTCA Type 1 message
containing the differential corrections used in the position
computation.
float
GloTimeShift 4 Current GLONASS time shift relative to GPS time in
microseconds, ranging from 0.0000 to +/-5000000.0000us.
Table 7.10. $PASHR,MIS Response Format for Message Type 1
Field
Length
(bytes)
Content