These are specifically for attitude determination in mobile environments. Not sure how good they would be for timing though. I remember seeing something from Trimble a few years back which did similar.
Rob K -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stan Sent: 01 May 2012 14:08 To: time-nuts@febo.com Subject: [time-nuts] Ashtech 3DF GPS On more or less of a whim, I found and bought an Ashtech 3DF GPS. The interesting thing about this particular GPS is that it uses four separate GPS antennas mounted in a diamond pattern about 1 meter on a side and can compute not only the "usual" stuff, but also heading, roll, and pitch angles. I had heard of this being possible, but never actually seen it done. There are no accessories included with this unit, other than the power cord. Does anyone know where I can find a manual for it? Will this GPS work with just four ordinary active antennas or are the antennas special? Given the complexity of the additional data massaging it does to extract the angular data, does this also mean that it will have more accurate position and or timing performance? Does it need all four antennas to be able to do anything at all, or can it compute position and time with just one antenna connected? Thanks, Stan _______________________________________________ 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.