APPENDIX A – PROPR. NMEA MESSAGE
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8. APPENDIX A – PROPR. NMEA MESSAGE
This chapter describes the NMEA 0183 proprietary message
PSXN, 20 and the special Ashtech RRE format output from
HS52. The PSXN,20 format is according to IEC 61162-1 and
follows the standard regarding unused fields on talker.
Description:
$PSXN,20,horiz-qual,hgt-qual,head-qual,rp-qual*csum term
$GPRRE,nsat,id,res...id,res,hpos-err,vpos-err*csum term
Explanation:
20
An identification of this message in a series of PSXN messages
(20 to 24)
horiz-qual
Horizontal position and velocity quality: 0 = normal, 1 =
reduced performance, 2 = invalid data.
hgt-qual
Height and vertical velocity quality: 0 = normal, 1 = reduced
performance, 2 = invalid data.
head-qual
Heading quality: 0 = normal, 1 = reduced performance, 2 =
invalid data.
rp-qual
Roll and pitch quality: 0 = normal, 1 = reduced performance, 2
= invalid data.
nsat
Number of satellites in use (00 - 99).
id
Satellite ID number, PRN (01 – 32).
res
GPS range residual in metres on format m.m (no fraction if the
value is greater than 99.9 metres).
hpos-err
Horizontal position error estimate in metres on format hhh.h
vpos-err
Vertical position error estimate in metres on format vvv.v
csum
Checksum (exclusive or) of all characters between, but not
including, the preceding $ and *, hexadecimal (00 - FF).
term
CR-LF (2 bytes, values 13 and 10).
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