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Thanks to the international GNSS service (IGS), which has provided an open-access real-time service (RTS) since 2013, real-time precise point positioning (RT-PPP) has become a major topic in the time community. Currently, a few scholars have studied RT-PPP time transfer, and the correlation of the receiver clock offsets between adjacent epochs have not been considered. We present a receiver clock...
We report on the initial use of Galileo signals in the Time and Frequency Department of Physikalisch-Technische Bundeanstalt (PTB). To this end PTB operated five GNSS receivers capable of receiving Galileo Open Service signals with calibrated signal delays for the two frequencies E1 and E5a.
Usually, satellite-ground clock difference of invisible arc is obtained by predicting. This paper proposes determining satellite-ground clock difference of invisible arc by way of inter-satellite link, using target satellite connecting station with relay satellite. Target satellite and station consists of satellite-ground link, target satellite and relay satellite consists of inter-satellite link...
At present, many Beidou tracking stations over the world have been set up for international GNSS Monitoring and Assessment System (iGMAS) and a pilot project named Multi-GNSS Experiment (MGEX) is implemented. Each station was equipped with the Multi-GNSS receivers which are able to track BeiDou as well as GPS signals. Furthermore some of stations were equipped with high-precision atomic clocks as...
The maximum error of time comparison of multiple stations is the time delay error of equipment. This paper demarcate relative deviation of multiple stations with mobile station, testing and evaluate system difference with the closure principle of three stations, this method can effectively demarcate system difference of multiple station, the accuracy is better than 1ns.
In satellite navigation system, the main time-frequency equipment of space segment is on-board clock, and its performance directly related to the pseudo code ranging and doppler effect observation precision, then affects the satellite navigation system orientation, velocity measurement and time service, so the test and evaluation of the on-board clock is very important. The methods and indicators...
It is a complex and important job that how to measure and estimate the time & frequency system before designing and evaluating a satellite navigation system. Almost all of the available methods for time & frequency performance measurement are designed for a single equipment or the discrete part. It is considered rarely to measure the performance of time & frequency system as a whole. In...
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