Thanks for the advice. Can anyone give me an idea of what the characteristics of GPS error are? In other words, is most of the error an offset that doesn't change? We might consider three terms: Error=Pure offset+Slow Offset+zero mean noise Pure offset would be something that does not change within the space of say a half hour. Slow offset is something that is significantly non-zero in a time average of say 30 seconds zero mean noise has a zero mean if you consider a time average of at least 30 seconds Can anyone give me an idea of the magnitudes of these terms in a receiver with 15meter CEP out in the open away from buildings? Thanks, Sean At 11:49 AM 7/25/2003 -0600, you wrote: >----- Original Message ----- >From: "Alex Kilpatrick" > > > I used a Lassen SQ in a project. It was about the same price as the > > other ones (~$150). It is very small, about 1.5" x 1.5". It worked > > fine, although the cable for it is highly specialized and hard to find. > >Waaayyyy Cool! I would have thought it would be at least $500 or so, being a >Trimble! >BTW, which cable? The antenna looks like a standard SMA or something, and I >would have thought it would be pretty simple to home-fab a power/data cable. >Gotta get me one of these. > > > I think that all the GPS modules are going to give you about the same > > accuracy. > >Yah, pretty much, unless they have WAAS or you care to implement DGPS. >BTW, one thing I'm interested in is a fairly cheap (<$500) GPS with 2-5Hz >update. Anyone have any ideas? I know a lot of the sub-meter Trimbles et. >al. have higher update rates, but at what $$$!! > >Thanks! > >- Robert > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu