Article: 4717 of sci.geo.satellite-nav From: Carsten Kurz Newsgroups: sci.geo.satellite-nav Subject: Re: Software WAAS upgrade on existing GPS units Date: Tue, 28 Aug 2001 20:59:53 +0200 Organization: Audio Visual Systems Lines: 25 Message-ID: <3B8BEA29.77243190@t-online.de> References: <3B898D94.1F98CBE5@cwnet.com> <3B8A6407.88464A89@cwnet.com> <3b8b0d2e@news3.accesscomm.ca> Reply-To: audiovisual@t-online.de Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: news.t-online.com 999026825 05 32382 9FqwS+5XEmYWJ+ 010828 19:27:05 X-Complaints-To: abuse@t-online.com X-Sender: 02238967924-0001@t-dialin.net X-Mailer: Mozilla 4.73 [de]C-CCK-MCD DT (Win98; U) X-Accept-Language: de Path: news.meer.net!sea-read.news.verio.net!dfw-artgen.news.verio.net!dfw-peer.news.verio.net!news.verio.net!newsfeed.mathworks.com!newsfeed2.news.nl.uu.net!sun4nl!bnewspeer00.bru.ops.eu.uu.net!emea.uu.net!newsfeed.r-kom.de!newsfeed00.sul.t-online.de!newsmm00.sul.t-online.com!t-online.de!news.t-online.com!not-for-mail Xref: archive.mv.meer.net sci.geo.satellite-nav:4717 > I disagree. If you know the global errors, and you know approximately > your location, you can compute the equivalent pseudo-range error, then > convert to RTCM format and feed it to the receiver. This is one method. > Software to do this has been developed at Natural Resources Canada, and > probably at other places. I suspect the Garmin and Magellan software > operate the same way. This is probably true - but still you have to have a source for local ionospheric correction data. The WAAS system collects this data anyway - so why not use the full WAAS system instead of picking out single structural aspects. I mean, basically WAAS costs nothing on the receiver side, compared with previous DGPS systems. - Carsten -- Audio Visual Systems fon: +49 (0)2238 967926 Carsten Kurz fax: +49 (0)2238 967925 Fasanenweg 38a email: audiovisual@t-online.de 50259 Pulheim / Germany WGS84:N50°58'44.7" E06°47'03.5"