[time-nuts] Thunderbolt code phase measurement

Mark Sims 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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