The Long-Term Performance Analysis and Comparison of BDS on-Board Atomic Clock Based on Precise Clock Products of IGS Analysis Centers

Abstract

As an important load of BDS, the performance of satellite-borne atomic clock directly affects the service level of navigation system. Based on the requirements of navigation system on atomic clocks in orbit, the performance of BDS spaceborne atomic clocks has been studied in recent years. Precise clock products of two IGS analysis centers wum and gbm with sampling interval of 300 s from 2014 to 2017 were adopted. The BDS spaceborne atomic clocks were evaluated and analyzed from accuracy, drift rate and stability respectively. The results indicate that, overall, MEO satellite clock performance is the best, followed by IGSO satellite clock, the worst is GEO satellite clock;the accuracy, the daily drift rate and the 10,000 s stability fluctuate at 7 × 10⁻¹²–4 × 10⁻¹¹, −3 × 10⁻¹³–3 × 10⁻¹³, 3 × 10⁻¹⁴–1.5 × 10⁻¹³ respectively. In terms of drift rate and the 10,000 s stability, the results of performance analysis of GEO satellite clock using two different precise clock products have great differences, while those of IGSO and MEO satellite clocks have little difference.