Acta Geodaetica et Cartographica Sinica >

2017 , Vol. 46 >Issue 2: 157 - 169

DOI: https://doi.org/10.11947/j.AGCS.2017.20160369

The Long-term Performance Analysis for On-board Atomic Clocks of BDS

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  • 1. School of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China;
    2. State Key Laboratory of Geo-information Engineering, Xi'an 710054, China

Received date: 2016-07-29

  Revised date: 2016-12-10

  Online published: 2017-03-07

Supported by

The National Natural Science Foundation of China (No. 41674019),The National Key Research and Development Plan (No. 2016YFB0501701),The Open Research Fund of State Key Laboratory of Geo-information Engineering (No. SKLGIE2015-M-1-6)

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Abstract

BeiDou Navigation Satellite System (BDS) has begun to provide regional services since the end of 2012. It plays an important role in analyzing the long-term performance of BDS satellite clocks in evaluating the performance of the whole system, determining and predicting satellite clock bias (SCB) etc. Precise satellite clock data products derived from multi-satellite orbit determination are used to conduct the performance analysis of BDS satellite clocks. Specifically, the characteristics of SCB data are discussed by using a proposed modified median absolute deviation (MAD) to preprocess original SCB data. Long-term variations of satellite clocks' phase, frequency, frequency drift and model noise level are analyzed based on the quadratic polynomial SCB model. Frequency stability of BDS satellite clocks is calculated and discussed based on Overlapping Hadamard Variance. Periodicity of BDS SCB is analyzed by using spectral analysis method. Integrating the above mentioned discussions and corresponding experiment results, the long-term performance of BDS satellite clocks is relatively comprehensively evaluated and analyzed. In addition, some valuable conclusions are obtained. For example, in the aspects of noise characteristics and clock drift, the performance of MEO satellite clocks is the best, followed by the IGSO satellite clocks, and the GEO satellite clocks' performance is the worst. The average values of noise level and frequency drift of BDS satellite clocks are respectively 0.677 ns and 1.922×10-18. There are also obvious periodic terms in BDS SCB data derived from multi-satellite orbit determination and their primary periods are approximate equal or one-half to the corresponding satellite orbit periods. The average value of frequency stability of BDS satellite clocks is 1.484×10-13.

Key words： BDS satellite clocks; MGEX clock products; clock model; frequency stability; periodic characteristic

Cite this article

WANG Yupu, LÜ Zhiping, WANG Ning . The Long-term Performance Analysis for On-board Atomic Clocks of BDS[J]. Acta Geodaetica et Cartographica Sinica, 2017 , 46(2) : 157 -169 . DOI: 10.11947/j.AGCS.2017.20160369

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