Didier Didier Juges wrote: > Hi Brooke, > > Thank you for your suggestions, that page is probably ripe for a rewrite, > but I may just add a link to your page for now :-) > > I would have thought the GPS receiver averages the readings when it locks on > multiple satellites. Are you saying it only uses one at a time? If so, > what's the point of a self survey? > > A weighted average is actually used as the measurement quality/precision/accuracy varies from SV to SV due to geometry and other factors. Not one at a time (unless only one is visible) but the receivers with less than 12 channels may not replace one of the 8 being tracked with a "better" new candidate SV until one of the tracked SVs vanishes below the horizon. Only early GPS receivers tracked one SV at a time, swichting between them periodically. Some carrier phase tracking receivers still do this tracking each visible SV for a short while before switching to the next in sequence. > I talk about WWV because most ham operators have a receiver that receives > WWV, so it is an inexpensive and convenient way to get an absolute > reference, even though it is not as good as GPS. > > I am sure there is a reason why timing receivers track all the way down, > instead of switching to a better bird when one is available, but by setting > the mask angle fairly high (appropriate for your location and obstructions), > you can take care of this problem. > > Didier KO4BB > > > Bruce
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