摘要
高精度的星间测速技术是实现卫星激光通信测量一体化和自主导航的关键技术之一.提出了一种基于调制码元多普勒测量的星间相干光通信链路的测速方法,采用单程单向的方式,在接收端利用码元符号同步和判决相位及符号信息,去除基带采样数据中的相位调制信息,获取相位连续的码元多普勒信号,可在完成星间通信的同时,实现对卫星相对运动速度的实时高精度测量.仿真结果验证了该方法可在通信速率为1 Gbit/s、误码率(BER)为10-9 情况下,实现0～11.625 km/s的相对速度测量,速度测量不确定度优于10.00 mm/s.
Abstract
High precision inter-satellite velocity measurement technology is one of the key technologies for realizing integration of satellite laser communication measurements and autonomous navigation.We propose an inter-satellite coherent optical communication link velocity measurement method based on modulated code element Doppler measurement.The method adopts a one-way unidirectional approach to obtain phase-continuous code element Doppler signals by using the phase and symbol information of code element symbol synchronization and verdict at the receiver side and by removing the phase modulation information in the baseband sampling data.This can aid in realizing the real-time high accuracy of satellite relative motion velocity while completing inter-satellite communication.The simulation results verify that this method can achieve the relative velocity measurement from 0 to 11.625 km/s at a communication rate of 1 Gbit/s and bit error rate(BER)of 10-9.Furthermore,the velocity measurement uncertainty exceeds 10.00 mm/s.
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