[time-nuts] surplus carrier phase measurement-capable receivers (was Thunderbolt firmware differences)
Magnus Danielson
magnus at rubidium.dyndns.org
Mon Jul 13 07:13:35 UTC 2009
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
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