Novatel OM-20000041 用户手册

C 

Commands Summary

MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

83

All oscillators have some inherent drift.  On the MiLLennium GPSCard, the clock and the PPS strobe have a 50 ns
jitter due to the receiver’s attempts to keep the clock as close as possible to GPS time. This option is disabled by
entering CLOCKADJUST DISABLE.  The jitter will vanish, but the unsteered and free-running clock will drift
relative to GPS time. 

CLOCKADJUST

 must also be disabled if the user wishes to measure the drift rate of the

oscillator using the 

CLKA

/

B

 data logs.

NOTE 1: Please note that, when disabled, the range measurement bias errors will continue to accumulate with

clock drift.

NOTE 2: This feature is to be used by advanced users only.

NOTE 3: Pseudorange, carrier phase and Doppler measurements may jump if CLOCKADJUST DISABLE is

issued while the receiver is tracking.

clockadjust disable

CLOCKADJUST

switch

CLOCKADJUST

-

Command

switch

enable or disable

Allows or disallows adjustment to the internal clock 

enable