ZED-F9R-Integration manual
Sending only the UBX-MGA-SF message will be rejected by the receiver even if the receiver is
in 3D-only mode.
Figure 22: Advanced calibration handling operational steps
3.10 Clocks and time
This section introduces and explains the concepts of receiver clocks and time bases.
3.10.1 Receiver local time
The receiver is dependent on a local oscillator for both the operation of its radio parts and also for
timing within its signal processing. No matter what nominal frequency the local oscillator has, u-blox
receivers subdivide the oscillator signal to provide a 1-kHz reference clock signal, which is used to
drive many of the receiver's processes. In particular, the measurement of satellite signals is arranged
to be synchronized with the "ticking" of this 1-kHz clock signal.
UBX-20039643 - R06
3 Receiver functionality Page 65 of 119
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