NMEA Commands 271
NMEA Commands
$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.
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.
Table 8.44. $GPRRE Message Format
Parameter Description Range
d1 The number of satellites used to compute position 0 to 14
d2 PRN number for each of the satellites used in the position
computation
1 to 32 for GPS
33 to 64 for SBAS
f1 Magnitude of the residual range error (meters) for each
satellite used in the position computation
-999.9 to +999.9
f2 RMS value for the horizontal position error (meters) -9999.9 to
+9999.9
f3 RMS value for the vertical position error (meters)
Table 8.45. Typical RRE Message
Field Description
$GPRRE Header
05 Number of satellites used to compute position
18 PRN of first satellite
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