Re: [time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
christopher hoover wrote: I wanted to have Heather make a RINEX file that could be submiited to OPUS-GIS to get a more precise antenna location. The Tbolt does not support carrier phase measurements. It does output doppler values. The code phase (pseudorange) values that it outputs look to be VERY difficult to translate into normal pseudoranges. You need to calculate the satellite positions from the almanac, etc to be able to use them. OPUS-GIS is still in alpha testing mode. I don't know what observable you need to have it post process the data. What typically-available surplus receivers do carrier phase measurements[1]? I'm close to putting up a choke ring antenna I scored off of the surplus market on the roof -- I don't think the wife is going to let me build a proper monument in the yard. :-) Hence, I, too, am interested in getting a precise antenna fix. I 'spose I could hire a surveyor, but that's cheating. Considering that the monument should go clear of the house for the antennas sky-view, I am sure that you are in good company with most of us here and many nodes of reference station networks in using the existing building rather than a fundament. -ch [1]. I did enough work w/surplus SuperStar receivers that I convinced myself I could flash the carrier phase-capable software onto the board, but that's stealing. I am interested in receivers where I can get legitimate access to carrier phase measurements. It depends, what if there is no commecial service available to get the carrier-phase option? There have been some work to build up a open-source code-base for GPS receiver software. But to answer the question, the CMC/Novatel series OEM boards, Motorola and Ashtech receivers can all have carrier phase ability. However, the carrier phase capable receivers is not easy to find. Cheers, Magnus ___ 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.
Re: [time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
What typically-available surplus receivers do carrier phase measurements[1]? I'm close to putting up a choke ring antenna I scored off of the surplus market on the roof -- I don't think the wife is going to let me build a proper monument in the yard. :-) Hence, I, too, am interested in getting a precise antenna fix. I 'spose I could hire a surveyor, but that's cheating. -ch Somewhat dated... but since we are looking at surplus... http://home-2.worldonline.nl/~samsvl/oemtable.htm I once did get phase measurements out of a Garmin GPSMAP76 with this http://home.comcast.net/~dmilbert/softs/garbin.htm Do not know the status of more current Garmin receivers. Teqc's list of supported format will give you further information. http://facility.unavco.org/software/teqc/tutorial.html#sec_15 Helenav sells converters for many L1 only phase capable receivers. http://www.helenav.nl/ To sum it up. Many (most?) surplus receivers are capable of phase measurements. You have to look out for crippled versions, where phase output might be an software option not loaded into the particular receiver you find. [1]. I did enough work w/surplus SuperStar receivers that I convinced myself I could flash the carrier phase-capable software onto the board, but that's stealing. I am interested in receivers where I can get legitimate access to carrier phase measurements. The superstar family is actually quit good at phase measurement. As you have noted not all receivers have the correct options loaded to enable phase output. With Novatel having EOLed the SuperStarII last year(?), the old CMC receivers are all out in the cold. I think though that you could still contact either Novatel or CMC Electroncs to order the software option for your SuperStar receivers. There are also higher end receiver appearing in the surplus market. Both L1 OEM-cards from Ashtech, Trimble, Novatel, Magnavox and also geodetic dual frequency receivers from the above and Topcon, Javad, Leica, Sokkia and some others. Beware though that old surplus equipment are sometimes priced higher than new on the bay and elsewhere. -- Björn ___ 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.
Re: [time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
But to answer the question, the CMC/Novatel series OEM boards, Motorola and Ashtech receivers can all have carrier phase ability. However, the carrier phase capable receivers is not easy to find. The Motorola Oncore VP did have carrier phase output. (with the right option loaded.) In newer models they removed the phase output. -- Björn ___ 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.
Re: [time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
On 7/13/09 1:59 AM, b...@lysator.liu.se b...@lysator.liu.se wrote: What typically-available surplus receivers do carrier phase measurements[1]? I'm close to putting up a choke ring antenna I scored off of the surplus market on the roof -- I don't think the wife is going to let me build a proper monument in the yard. :-) Hence, I, too, am interested in getting a precise antenna fix. I 'spose I could hire a surveyor, but that's cheating. hire a surveyor.. Really... This is time-nuts. You should get yourself a good quality theodolite (surplus, or make one.. If Tycho Brahe can do it, so can you) and start making those astronomical measurements yourself. I'll bet there's even astromonical surveying mailing lists. Procedures wise, the BLM has a manual online (since much of the survey work for the U.S. Public Lands Survey System (PLSS) is based on astronomical methods...). A copy of Davis and Foote (or whatever the current authors are) wouldn't be useless, either. 10cm accuracy is a big challenging with a standard theodolite. You can read a Wild T2 to a second of arc.. That's on the order of a few tens of meters position accuracy.. But I think with multiple measurements, one can bring the uncertainty down. There's a great CDROM available for $50 from the Institute of Navigation with all the papers on celestial nav ___ 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.
Re: [time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
I wanted to have Heather make a RINEX file that could be submiited to OPUS-GIS to get a more precise antenna location. The Tbolt does not support carrier phase measurements. It does output doppler values. The code phase (pseudorange) values that it outputs look to be VERY difficult to translate into normal pseudoranges. You need to calculate the satellite positions from the almanac, etc to be able to use them. OPUS-GIS is still in alpha testing mode. I don't know what observable you need to have it post process the data. What typically-available surplus receivers do carrier phase measurements[1]? I'm close to putting up a choke ring antenna I scored off of the surplus market on the roof -- I don't think the wife is going to let me build a proper monument in the yard. :-) Hence, I, too, am interested in getting a precise antenna fix. I 'spose I could hire a surveyor, but that's cheating. -ch [1]. I did enough work w/surplus SuperStar receivers that I convinced myself I could flash the carrier phase-capable software onto the board, but that's stealing. I am interested in receivers where I can get legitimate access to carrier phase measurements. ___ 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.
