Abstract
Time Transfer Realized by PPP Technique for Trimble Netrs and TTS-4 ReceiversThis paper concerns determination of clock readings and position of two geodetic receivers: TRIMBLE NetRS and TTS-4, connected to the same antenna of Dorne Margolin choke ring type (IGS BOR1 point) with the usage of precise point positioning (PPP) technique. The TTS-4 receiver was constructed and provided with its software by the time and frequency team from Borowiec Astrogeodynamical Observatory (AOS). Parameters of the receiver clocks and antenna coordinates were determined for the period from 1 to 30 April 2011. The collected data in RINEX format include code and phase observations from GPS constellation recorded with 30 second interval. The computed positions of the antenna based on RINEX data files from TRIMBLE NetRS and TTS-4 receivers are practically the same. The differences of estimated coordinates are from 0.6 to 1.6 mm. However, the accuracy of the clock parameters computed for TRIMBLE NetRS receiver are by one order lower than for TTS-4. It means that TRIMBLE NetRS receiver synchronized with internal quartz oscillator can not be used for timing applications. Currently the AOS laboratory works on the realization and development of the PPP method are in progress. Ultimately, the method
Highlights
The main purpose of this paper is the determination of the readings of the receivers’ clocks connected to the shared GNSS antenna (BOR1 point) and the position of BOR1 point based on RINEX data with the precise point positioning (PPP) method
Results comparisons for two different receivers were to give answers for questions: 1) what is the accuracy of clock’ determinants for each of the receivers based on the PPP method for two different receivers connected to the same antenna? 2) what is the accuracy of position determination based on the same method? The analyses presented in this paper work are the PPP results obtained by the Astrogeodynamical Observatory (AOS) team realizing various time transfer and frequency techniques
The main goal of the paper was answering the question: what is the accuracy of clock determinants of the TRIMBLE NetRS and TTS-4 receivers based on the PPP method ? The obtained results for one month of data set show that for TTS-4 receiver the RMS of clock determinants is on the level of 2 ns and about 6 ns for TRIMBLE NetRS receiver
Summary
The main purpose of this paper is the determination of the readings of the receivers’ clocks connected to the shared GNSS antenna (BOR1 point) and the position of BOR1 point based on RINEX data with the precise point positioning (PPP) method. Results comparisons for two different receivers were to give answers for questions: 1) what is the accuracy of clock’ determinants for each of the receivers based on the PPP method for two different receivers connected to the same antenna? The analyses presented in this paper work are the PPP results obtained by the AOS team realizing various time transfer and frequency techniques. The PPP method is currently the latest comparison technique of atomic clocks and atomic time scales for long distances based on phase and pseudorange measurements realized by the AOS team. Computations with the PPP method were carried out with Natural Resource Canada's GPS Precise Point Positioning (GPS - PPP) software based on GPS data recorded with 30-second interval, both for the TRIMBLE receiver and for the TTS-4. About the choice of the NRCan software, a few essential parameters were decided such as processing of very large data sets (very long time series of the data, up to 45 days), flexibility of the software (it is easy to modify the code of the software), easy installation and operation of the software, the final results are recorded in a comfortable form for graphical presentation
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