ashtech DG16 Reference Manual page 291

$PASHQ,RRE,[c1]
This command queries the RRE message, where c1 is the optional port designator
for the output of the response. If a port is not specified, the receiver sends the
response to the current port.
$GPRRE
This message contains residual error values for the each pseudo-range
measurement and RMS values for horizontal and vertical position error. The RRE
message is not output unless positions are being computed. Residual errors and
position errors are computed only if a minimum of 5 locked satellite's are used to
compute position; otherwise zero values are registered in the data fields. The
message is output in the format:
$GPRRE,d1,((d2,f1)*d1),f2,f3*hh
Table 8.44 outlines the message format.
The data fields for PRN number (d2) and residual range error (f1) are repeated for
each locked satellite, with the d1 value acting as a multiplier.
Parameter
d1 The number of satellites used to compute position
d2 PRN number for each of the satellites used in the position
computation
f1 Magnitude of the residual range error (meters) for each
satellite used in the position computation
f2 RMS value for the horizontal position error (meters)
f3 RMS value for the vertical position error (meters)
Typical RRE message:
$GPRRE,05,18,000.2,29,000.2,22,-000.1,19,-000.1,28,000.5,
0002.0,0001.3*76
Table 8.45 outlines the response message.
Field
$GPRRE
05
18
NMEA Commands
Table 8.44. $GPRRE Message Format
Description
Table 8.45. Typical RRE Message
Description
Header
Number of satellites used to compute position
PRN of first satellite
Range
0 to 14
1 to 32 for GPS
33 to 64 for SBAS
-999.9 to +999.9
-9999.9 to
+9999.9
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