The integration of laser communication and ranging technology for inter-satellite links merges high-speed communication capability with precise ranging and positioning function.This integration ad-dresses challenges such as low communication rates,compromised link concealment,and excessive satel-lite payloads effectively.Nevertheless,the communication quality and ranging accuracy in the coherent inter-satellite laser link system are impacted by Doppler frequency bias.To counteract this issue,a meth-od involving precise ranging and frequency bias correction based on the timing synchronization loop is pro-posed.This synchronization loop enhances the ranging accuracy up to 10-1 mm across the inter-satellite distances ranging from 100 km to 1 500 km,and at the symbol rate of 5GBaud.It also enables the esti-mation and compensation of the code Doppler frequency bias within a±125 kHz range in the inter-satel-lite links.Consequently,this method effectively eliminates Doppler frequency bias interference in the co-herent system,thereby improving both ranging accuracy and ability against frequency bias.
关键词
通信测距一体化/星间激光链路/定时同步/多普勒频偏
Key words
integration of communication and ranging/inter-satellite laser communication link/timing synchronization/Doppler frequency bias
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