流动卫星激光测距系统的距离选通实现方法  

Implementation method of range gating for mobile satellite laser ranging system

作　　者：朱建春 李欣 朱威[2,3,4] Zhu Jianchun;Li Xin;Zhu Wei(School of Electronic Science and Control Engineering,Institute of Disaster Prevention,Langfang 065201,China;Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Key Laboratory of Earthquake Geodesy,China Earthquake Administration,Wuhan 430071,China;Hubei Earthquake Administration,Wuhan 430071,China)

机构地区：[1]防灾科技学院,电子科学与控制工程学院,河北廊坊065201 [2]中国地震局地震研究所,湖北武汉430071 [3]中国地震局地震大地测量重点实验室,湖北武汉430071 [4]湖北省地震局,湖北武汉430071

出　　处：《红外与激光工程》2022年第12期137-147,共11页Infrared and Laser Engineering

基　　金：湖北省自然科学基金(2021 CFB314);中央高校基本科研业务费研究生科技创新基金(ZY20210310)。

摘　　要：现有流动卫星激光测距系统的距离选通模块因硬件架构问题,有稳定性不高、可靠性不强等不足。由于和固定站的设备互不兼容,因此需要研制新的距离选通模块,在兼顾高集成度的同时提升运行稳定性。在基于距离选通与后向散射规避的实现原理基础上,依靠ARM、FPGA嵌入式双核心架构设计全新的距离选通模块。采用人卫激光测距卫星lageos1、ajisai和地球同步卫星compassi3的星历进行距离门参数拟合等测试。经测试,该距离门控模块参数拟合误差小于0.01%,在2kHz重复频率下单次预期回波时刻计算时间约为34.365μs,平均后向散射规避点火频率损失率低于1%,在2kHz重复频率下距离门分辨率优于5ns,高频率门控信号输出平稳,并且能够满足20kHz以上的重复频率应用需求,符合预期结果,具有实际应用价值。Due to the problem of hardware architecture,the range gating module of the existing mobile satellite laser ranging system has some shortcomings,such as low stability and low reliability.Since it is incompatible with the equipment of the fixed station,it is necessary to develop a new range gating module to improve the operation stability while giving consideration to high integration.Based on the realization principle of range gating and backscattering avoidance,the new range gating module is designed with ARM and FPGA embedded dual core architecture.The module used the ephemeris of lageos1,ajisai and geosynchronous compassi3 satellites to fit the range gating parameters.The test results show that the parameter fitting error of the range gating module is less than 0.01%,and the calculation time of a single expected echo epoch is 34.365μs at repetition rate of 2kHz.The average firing frequency loss rate due to the backscattering avoidance is less than 1%.The resolution of range gating is lower than 5ns at repetition rate of 2kHz.The output of high frequency gating signal is stable and the module can meet the requirements of repetition frequency applications over 20kHz.It conforms to the expected results and has practical application value.

关 键 词：距离选通 激光测距 多项式拟合 高重复频率 流动观测 

分 类 号：P228.5[天文地球—大地测量学与测量工程]