[time-nuts] Thunderbolt code phase measurement
holrum at hotmail.com
Wed May 16 02:01:15 EDT 2018
Many thanks Peter for confirming what I suspected. The problem with the Trimble receivers is that requesting the satellite C/A code data can hose up a lot of them. So, I'm stuck with calculating the integer number of milliseconds. How to do that? I do know my position to a few feet.
I have Lady Heather generating RINEX files for the Ublox timing receivers, the NVS-08, the Furuno GT-87, and the Ashtech Z12 (with both L1/L2 data). It would be nice to be able to support the Trimble receivers. With L1 only data I am getting results in the < 200 mm range. The Z12 with L1/L2 data gets me to around 40 mm.
> If you know your position to within 150 kilometers (0.5 ms), you can
dispense with the pseudorange-assembly arithmetic and just use the code
phase directly, after adding in the appropriate integer number of
milliseconds, only one of which will put you within your known
300-kilometer-diameter (1 ms) sphere.
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