The ArcPad software is setup as a DGPS field GIS that operates on a PDA.
We use it extensively with Mapinfo datasets.
Have a look at http://cewire.com/ - ArcPad 5 unveiled
Jeff Bailey
Neil Havermale wrote:
> 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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