Microwave Satellite-Ground Time-Frequency Comparison Techniques Based on the China Space Station:Initial Testing Validation and Analysis
High-precision time-frequency comparison is a crucial demand in modern science and technology.Yet,the performance of current technologies is significantly hindered by the measurement capabilities of comparison systems and the error processing algorithms of link systems.Addressing these challenges,this study establishes a high-precision satellite-ground microwave time-frequency comparison system based on the China Space Station(CSS),introducing a novel satel-lite-ground time-frequency comparison technique that employs two-way measurements(tri-frequency mode)and includes advanced methods for detailed modeling of link system errors.Simulations across various satellite-ground time-frequency comparison scenarios reveal that,even with high-precision clocks(10-15 to 10-17),the long-term performance of the compari-son,optimized through our algorithm,can achieve near-original satellite-ground clock performance.Preliminary compari-son tests using the hydrogen maser clocks on the CSS and the ground demonstrate that,within a 300-second visibility arc,CSS-ground time-frequency comparison precision can reach 10.77 ps,with an ADEV(Allan Deviation)of 9.992 1×10-14@100 s,closely matching simulation results.This research provides new theoretical foundations and technical references for precision time-frequency synchronization technology.
China Space Stationatomic clocksatellite-ground microwave linktime-frequency comparisontwo-way measurement
国家科技期刊平台
NSTL
万方数据
