ashtech DG14, Reference Manual

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274 DG14 and DG16 Board & Sensor Reference Manual
The SAT message displays more information on unused satellites. Used satellites are indicated with
a U and unused satellites, by default, are indicated with a -. If you enable the satellite usage
indicator, SUI, switch, a variety of flags display instead of a - to indicate the reason why the
respective satellite is not used in the solution.
Typical SAT message:
$PASHR,SAT,03,03,103,56,60,U,23,225,61,39,U,16,045,02,21,U*6E
c6 Indicates whether the locked satellite is used in position
computations:
• U—Used
• A dash (-) indicates that the satellite is not being used in
position computations
• M—Satellite NOT used because of low elevation
• S—Satellite NOT used because the pseudo-range is not
settled (transient is not over)
• H—Satellite NOT used because marked 'unhealthy' in
ephemeris
• B—Satellite NOT used because of bad URA (or some
accuracy problem indicated in navigational data)
• Z—Satellite NOT used because marked 'unhealthy' in almanac
• D—Satellite NOT used because differential corrections are old
or invalid
• J—Satellite NOT used because big code outlier was detected
• R—Satellite NOT used because RAIM or some other algorithm
detected a pseudo-range bias.
• I—Satellite NOT used because SV disabled by external
command SVP,USP)
• L—Satellite NOT used because Signal To Noise Ratio is less
than Mask
• G—Satellite NOT used because it's possibly a ghost satellite
• V—Satellite NOT used because computed satellite coordinates
are suspicious
• N—Satellite NOT used because satellite true number unknown
(for modes, where we need the true SV number
• K—Satellite NOT used because it was disabled by RTK engine
(N/A in DG16)
• O—Satellite NOT used because of some other case
• E—Satellite NOT used because no navigational data
(ephemeris) is available
• p—Satellite NOT used because no full range is available
*hh Checksum 2-character hex
Table 8.46. $PASHR,SAT Message Format (Continued)
Field Description Range