Not cheap but VOR was used when I was flying. http://en.wikipedia.org/wiki/VHF_omnidirectional_range
Stanley ----- Original Message ---- From: Bob Camp <li...@rtty.us> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Wed, August 25, 2010 9:25:31 PM Subject: Re: [time-nuts] Slightly OT - GPS-Based Accurate Direction Finding Hi GPS is not very helpful for direction. It can be used as an accurate source of time and location to feed a solar or celestial direction estimate. Bob On Aug 25, 2010, at 9:04 PM, David Smith <da...@smithfamily.net.au> wrote: > As a fair percentage of the discussion amongst the learned gentlemen on this >group involves GPS-based timing systems, I'd like to ask a non-time related, >but >GPS-related question. > > As part of microwave radio experimentation, often on windy hilltops, I have a >need to find direction very accurately. I have seen advertised GPS-based >Azimuth Pointing Systems such as this: > http://www.ascscientific.com/APS.html > However they are a little (lot) out of my budget range. > > The system seems to work by taking the raw satellite phase information from > two >separate GPS systems and crunching the data to come up with an azimuth >figure. >Has anyone heard of a (Open Source?) program that could be used to do these >calculations? > > Regards, > David Smith > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.