Categories
Time and Frequency

uBlox F9T qErr correction

Here's a test of how to correct the 1PPS signal out of an F9T with the qErr-value from the UBX-TIM-TP message.

When the time-interval-counter is configured with start=reference-clock, stop=uBlox, the qErr is applied with a + sign to the measured time-interval - resulting in much smoother data for averaging times up to tau=1000s.

Categories
Time and Frequency

uBlox F9T test

Test of the 1PPS stability of an uBlox F9T dev-kit RCB-F9T