> Rain should have an effect on the timing of the signal, since the > propagation speed of radio waves through water is different from that > through air. It will also attenuate the signal, causing worse S/N > ratio which would cause the lower-elevation satellites to not be seen.
That's what I would expect, but a quick search via google doesn't find anything to back that up. Do you have any numbers? The links below may think that 10 ns (aka 10 ft) isn't anything to worry about. From: http://gpsinformation.net/gpsclouds.htm Cloud, Rain, Snow, weather in general does NOT attenuate the GPS signals enough to effect accuracy. The link off to specs that back that up doesn't mention rain. From: http://www.dummies.com/WileyCDA/DummiesArticle/id-2572.html Clouds, rain, snow, and weather don't reduce the strength of GPS signals enough to reduce accuracy. The only way that weather can weaken signals is when a significant amount of rain or snow accumulates on the GPS receiver antenna or on an overhead tree canopy. This says/mumbles that it does matter: http://www.eomonline.com/Common/Archives/1995nov/95nov_gps.html But doesn't give any numbers. -- The suespammers.org mail server is located in California. So are all my other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited commercial e-mail to my suespammers.org address or any of my other addresses. These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts