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Method and system for disciplining a local reference oscillator by GPS 1PPS signal

Pawłowski E., Warda P.

Przegląd Elektrotechniczny

2018

R. 94, nr 7

38--41

This article presents an algorithm and system for synchronizing a local OCXO reference generator to an one-pulse-per-second (1PPS) GPS clock reference signal. The generator system flowchart and the structure of the program performing the synchronization process are discussed. Appropriate measurement system, which allows assessment of obtained results, is also presented and measurement results are shown.

W artykule przedstawiono algorytm dyscyplinujący lokalny generator wzorcowy OCXO względem sygnału sekundowego 1PPS systemu nawigacyjnego GPS. Omówiono metodę i układ do synchronizacji generatora oraz odpowiedni układ pomiarowy do kontroli procesu tej synchronizacji. Zaprezentowano uzyskane wyniki pomiarów.

PPS Quality Estimation From Different Receivers

Kubczak P., Matuszewski Ł.

Measurement Automation Monitoring

2016

Vol. 62, No. 11

383--386

The article presents data analysis of the short-term and long-term-periodic characteristics of the PPS (Pulse Per Second) signal from the navigation systems. The signal arrival time to the Earth was assessed in relation to a high stability frequency source. The basic statistical properties of the signal were calculated, e.g. mean, variance, autocorrelation and actual distributions of random variables were depicted by using a histogram. The differences have been compared between the quality of the signal from the GPS network, the GLONASS network and their combination. The equipment offered by various manufacturers was assessed. Finally, the impact of the MAV filter (Moving Average) on the characteristics of the random variable was examined. At last, but not least, the autocorrelation was checked.