Performance of a PID phase lock loop with Kalman filtered input data (GPS data)

摘要

The performance of a rubidium oscillator disciplined to Global Positioning System (GPS) satellite time transmissions is presented together with the phase look loop technique used. The results show an offset frequency accuracy of 1.0*10/sup -11/, while maintaining a phase accuracy of 300 ns versus universal time code (UTC). Typically, the offset frequency error was or=2.0*10/sup -12/. Results of analyzing recently acquired GPS data are presented. The fractional frequency stability of least squares estimates performed on the data demonstrate that one can at best expect 2.0*10/sup -11/ frequency accuracy with an OCXO, and can expect accuracies of 2.0*10/sup -12/ (typically) with rubidium oscillators.