现代防御技术 ›› 2022, Vol. 50 ›› Issue (6): 83-89.DOI: 10.3969/j.issn.1009-086x.2022.06.010

• 目标特性与探测跟踪技术 • 上一篇    下一篇

中断连续波去斜体制距离走动分析及补偿方法

贾学振(), 孙武, 徐秋锋, 陈睿容   

  1. 北京遥感设备研究所,北京 100854
  • 收稿日期:2022-05-04 修回日期:2022-06-25 出版日期:2022-12-28 发布日期:2023-01-06
  • 作者简介:贾学振(1986-),男,山东德州人。高工,硕士,研究方向为雷达系统设计及雷达信号处理。通信地址:100854 北京市142信箱205分箱E-mail: j_xz001@163.com

Range Walk Analysis and Compensation Algorithm of Interrupted Continuous Wave Dechirp System

Xue-zhen JIA(), Wu SUN, Qiu-feng XU, Rui-rong CHEN   

  1. Beijing Institute of Remote Sensing Equipment,Beijing 100854,China
  • Received:2022-05-04 Revised:2022-06-25 Online:2022-12-28 Published:2023-01-06

摘要:

针对中断连续波去斜体制的高速目标距离走动及对信噪比的影响进行了定量分析,分析结果表明:发生距离走动时的差频信号是一个线性调频信号。针对该现象,提出了一种时域反转压缩补偿方法,利用信号时频特征,在时域生成时序反转的信号,与原信号共轭相乘去除调频斜率,实现信号压缩;同时提出了一种二次匹配滤波压缩的方法,基于速度搜索信息,计算距离走动时的差频信号调频斜率,生成相反斜率的匹配滤波器,进行二次匹配滤波消除距离走动。能够消除高速目标的距离走动影响,提高探测威力和探测精度,可以应用于去斜体制中断连续波探测雷达,在高速目标探测领域有很好的借鉴意义。

关键词: 中断连续波, 去斜体制, 距离走动, 时域反转压缩, 高速目标探测

Abstract:

The paper makes a quantitative analysis on the range walk of high-speed target and its influence on signal-to-noise ratio in interrupted continuous wave dechirp system. The analysis results show that the difference frequency signal when range walk occurs is a LFM(linear frequency modulation) signal. Aiming at this phenomenon, a time-domain inversion compression compensation method is proposed, which uses the time-frequency characteristics of the signal to generate a time-reversed signal in the time domain, which is conjugated and multiplied with the original signal to remove the frequency modulation slope and realize signal compression. At the same time, a quadratic matched filter compression method is proposed. Based on the speed search information, the frequency modulation slope of the difference frequency signal during range walking is calculated, and the matched filter with the opposite slope is generated. The range walking is eliminated by quadratic matched filtering. It can eliminate the influence of distance walking of high-speed targets, improve the detection power and detection accuracy, and can be applied to the declination system interrupt CW detection radar, which has a good reference significance in the field of high-speed target detection.

Key words: interrupted continuous wave, dechirp mode, range walk, time-domain inversion compression, high-speed target detection

中图分类号: