There are two basic ways to do this: RTCM 105 Ver 2.0 versus RINEX. The
RTCM method is realtime and requires in the reviever the Flashcode to
off-set the differential from pseudorange. The receiver itself is the
translator for realtime differential accureay. Any number of GPS devices
can output RTCM105 corrections.
RINEX (receiver independent navigation ...) is a an "open" standard. It is
possible to do kinematic post processing as well with an "extended RINEX"
method. A number of receivers ouput necessary psuedorange in binary
formats, TSIP from Trimble is an example. These tend to be verbose and must
be logged to disk or other memory space. These binary data must be
downloaded to a workstataion and then translated to RINEX data standards.
Once the benchmark and rover are in RINEX formats one of several OCX tools
can wash the rovers positon with the RINEX benchmark corrections. It is a
postprocessing method resulting in very low or no latency in pseudorange
offsets.
You might try at one of the several GIS web sites to hunt the WEB for RINEX
info. I am certain the RINEX definitions and source codes are out there. It
might just be easier to buy a post-processing developers license for the
receivers of interest? More info possibly via the US Coast Guard?
MidNight Mapper
aka Neil
-----Original Message-----
From: Robert Crossley [mailto:[EMAIL PROTECTED]]
Sent: Friday, March 03, 2000 1:02 PM
To: MapInfo List
Subject: MI: GPS position correction
Could anyone direct me to information on the information that is needed to
calculate the correct position from two GPS units, one of which is from a
fixed, known location. Basically I want to do differential correction of a
GPS location transitted back by telemetry to a base station.
Have searched the web and found a number of packaged solutions, but little
on the mathematics and data required for the correction.
Robert Crossley
Trinity Software
10 Trinity Street
CAIRNS 4870 AUSTRALIA
Ph: 61-7-40314877
[EMAIL PROTECTED]
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