Article: 38683 of sci.geo.satellite-nav From: Carsten Kurz Newsgroups: sci.geo.satellite-nav Subject: Re: Cheapest DGPS system available? Date: Tue, 30 Jul 2002 22:58:08 +0200 Organization: Audio Visual Systems Lines: 29 Message-ID: <3D46FDE0.3A586637@t-online.de> References: 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 1028062719 03 2533 zLDfbPnSUAq1h 020730 20:58:39 X-Complaints-To: abuse@t-online.com X-Sender: 02238967924-0001@t-dialin.net X-Mailer: Mozilla 4.78 [de]C-CCK-MCD DT (Win98; U) X-Accept-Language: de Path: news.meer.net!sea-read.news.verio.net!dfw-artgen!iad-peer.news.verio.net!news.verio.net!news.maxwell.syr.edu!newsfeed.stueberl.de!newsfeed01.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:38683 > Given your receiver supports it, it doesn't cost you a dime in additional > fees, it is available in all America or Europe. > > EGNOS in Europe (see www.esa.int) got updated to send RTCA DO-229B > corrections, which will enable submeter accuracies with an L1 EGNOS (or > WAAS) capable receiver. WAAS you can find information on www.faa.gov, I > think. The problem with WAAS and EGNOS is that the birds sending out the corrections sit on rather low elevations (25-35 degrees) for most current 'hot' GPS countries. That means you have to have a fairly unobstruted south view, and that for a decent amount of time (at least 10-20min consecutively). Other DGPS solutions may cost a bit more, but may have better operating conditions. WAAS and EGNOS have been developed for aviation purposes, where the low elevation angles are no problem usually. Right now it seems that with the current WAAS enabled consumer receivers, it's more a question of luck to get a DGPS fix in real life environments. So, it's nice to see it happen, but it's nothing you can depend on. - 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"