Instruction manual

Command Response Formats Page 115
Command
A range residual (xxx.x) is computed for each satellite (ss) used in position
computation. Residuals and position errors not computed unless at least 5 satellites
are used in position computation. The fields in the RRE message are as defined in
Table 4.63.
Example: Query: $PASHQ,RRE,A or
Set: $PASHS,NME,RRE,A,ON
Typical Response:
$GPRRE,05,18,+000.2,29,+000.2,22,-000.1,19,-000.1,28,
+000.5,0002.0,0001.3*76
where each item is as described in Table 4.64.
Table 4.63: RRE Structure
Field Description
qq Number of satellites used to compute position
ss
PRN number for each of the satellites used in position
computation
s,xxx.x.....
+ or - and xxx.x = range residuals magnitude in meters for
each satellite used in position computation
hhhh.h
vvvv.v
Last 2 fields: hhhh.h = horizontal RMS position error in meters
vvvv.v = vertical RMS position error in meters
Table 4.64: Typical RRE Response
Item Description
$GPRRE Header
05 Number of SVs used to compute position
18 PRN of first SV
+000.2 Range residual for first SV in meters
29 PRN of second SV
+000.2 Range residual for second SV in meters
22 PRN of third SV
-000.1 Range residual for third SV in meters
19 PRN of fourth SV
-000.1 Range residual for fourth SV in meters
28 PRN of fifth SV
+000.5 Range residual for fifth SV in meters
0002.0 Horizontal position error in meters