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基于远程脉冲激光外差探测的匹配滤波过程研究

Study on Matched Filtering Process Based on Long-Range Pulsed Laser Heterodyne Detection

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摘要

以远程脉冲激光外差探测系统为模型, 推导了系统的信号与噪声的表达式, 给出了脉冲激光外差探测系统匹配滤波算法流程, 对匹配滤波技术在中程导弹与国际空间站目标探测中的详细应用过程进行了仿真, 分析了目标距离、散射截面面积、数字采样率对探测能力的影响。仿真结果表明: 在100 MHz采样率的数字处理能力下, 分别用蒙特卡罗法仿真了500次匹配滤波过程, 对于散射截面面积为5 m2、距离为100 km的中程导弹, 回波信号载噪比为3.29 dB, 匹配滤波后信号载噪比为25.13 dB, 信号强度增强了152倍, 距离精度为27 m, 速度精度为0.17 m/s; 对于散射截面面积为100 m2、距离为500 km的国际空间站, 回波信号载噪比为-6.12 dB,匹配滤波后信号载噪比为18.49 dB, 信号强度增强了289倍, 距离精度为117 m, 速度精度为2.1 m/s。目标距离越小, 散射截面面积越大, 数字采样率越高, 匹配滤波提取增强信号的能力越强。

Abstract

Based on the long-range pulsed laser heterodyne detection system, the expression of signal and noise of the system is deduced. The matched filtering algorithm processing of the pulsed laser heterodyne detection system is given. The detailed application process of matched filtering technique in target detection of medium-range missiles and international space station is simulated. The influence of the target range, the scattering cross section area and the digital sampling rate on the detection capability is analyzed. The simulation results show that, under the digital processing capability of 100 MHz sampling rate, the Monte Carlo simulation of 500 matching filtering process is carried out. For the medium-range missile with the scattering cross section area of 5 m2 and the distance of 100 km, the carrier-to-noise ratio of echo signal is 3.29 dB, the carrier-to-noise ratio of echo signal after matched filtering is 25.13 dB, the signal strength increases 152 times, the range accuracy is 27 m and the range rate accuracy is 0.17 m/s. For the international space station with the scattering cross section area of 100 m2 and the distance of 500 km, the carrier-to-noise ratio of the echo signal is -6.12 dB, the carrier-to-noise ratio of the echo signal after matched filtering is 18.49 dB, the signal strength increases 289 times, the range accuracy is 117 m and the range rate accuracy is 2.1 m/s. The smaller the target range is, the larger the radar cross section area is, and the higher the digital sampling rate is, the stronger the ability of the matched filtering to extract and enhance the signal is.

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中图分类号:TN247

DOI:10.3788/AOS201838.0128003

所属栏目:遥感与传感器

基金项目:中国科学院前沿科学重点研究计划(QYZDB-SSW-SLH014)

收稿日期:2017-07-21

修改稿日期:2017-09-02

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作者单位    点击查看

吴世松:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
张合勇:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033
王挺峰:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
郭劲:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
晏春回:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
吕韬:中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049

联系人作者:吴世松(wss768625265@126.com)

备注:吴世松(1992-), 男, 硕士研究生, 主要从事远程激光外差探测方面的研究。E-mail: wss768625265@126.com

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引用该论文

Wu Shisong,Zhang Heyong,Wang Tingfeng,Guo Jin,Yan Chunhui,Lü Tao. Study on Matched Filtering Process Based on Long-Range Pulsed Laser Heterodyne Detection[J]. Acta Optica Sinica, 2018, 38(1): 0128003

吴世松,张合勇,王挺峰,郭劲,晏春回,吕韬. 基于远程脉冲激光外差探测的匹配滤波过程研究[J]. 光学学报, 2018, 38(1): 0128003

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