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摘要LFM脉冲压缩技术较好的解决了雷达作用距离与分辨力的矛盾，并且使与雷达发射波形不匹配的干扰信号不能得到相应的处理增益。研究针对LFM脉压雷达的干扰与抗干扰方法具有重要的意义。对LFM脉压雷达进行间歇采样转发干扰和循环转发干扰，通过建模仿真，将仿真结果与理论分析对比，得出关键参数对其的影响。针对该类型的干扰特点研究对抗干扰的方法，对接收信号进行Stretch处理，通过低通滤波器滤除干扰信号，得到目标回波分量，然后进行逆Stretch处理，恢复出真实目标回波信号，最后通过仿真实验验证了该算法的有效性。25234
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关键词 LFM；间歇采样；脉冲压缩 ；Stretch处理
毕业设计说明书(毕业论文)外文摘要
Title Research on Intermittent Sampling Transponder Interference Modeling and Anti-jamming Algorithm for LFM Pulse
Compression Radar
Abstract
The LFM pulse compression technology solves the problem of confliction between radar maximal range and range resolution. The jamming signal which does not match with the radar signal can not get the corresponding processing gain, the study for LFM pulse compression radar coherent interference method and anti-jamming technology is an important issue. In this paper, the procedure of intermittent sampling transponder interference and cycle forwarding interference to LFM pulse compression radar is given .Using MATLAB, the effect of interference to the LFM pulse compression radar, as well as the influence of key parameters of interference to LFM pulse compression radar, is simulated. Next, the anti-jamming method for the interferences above is studied. First, the received echo in each PRI is Stretch processed. Then, the Stretch-processed signal is sent through a low-pass filter. At last, the filtered signal is inverse-Stretch processed, the interference is cancelled and the target echo is recovered. Simulation results are given to demonstrate the effectiveness of the anti-jamming method.
Keywords LFM; Intermittent sampling; Pulse compression; Stretch processing
目 次
1 引言 1
1.1 研究背景 1
1.2 本文主要内容 2
2 LFM脉压雷达工作原理 3
2.1 线性调频（LFM）信号 3
2.2 LFM脉冲的匹配滤波 3
3 间歇采样转发干扰的建模与仿真 6
3.1 工作原理与数学建模 6
3.2 干扰效果的理论与仿真分析 10
3.2.1 仿真实验与结果分析 10
3.2.2 关键参数对干扰效果影响 17
3.2.3 干扰效果及优势分析 24
4 间歇采样循环转发干扰建模与仿真 25
4.1 重复转发干扰 25
4.1.1 工作原理 25
4.1.2 干扰效果分析 27
4.1.3 仿真实验与结果分析 27
4.2 逐次循环转发干扰 30
4.2.1 工作原理 30
4.2.2 干扰效果分析 32
4.2.3 仿真实验与结果分析 32
5 抗干扰算法的建模与分析 35
5.1 LFM雷达中假目标的对消 35
5.1.1 Stretch处理 35
5.1.2 时-频解耦原理 35
5.1.3 干扰信号估计和对消 36
5.1.4 仿真和结果分析 37
5.2 间歇采样转发干扰的抗干扰仿真 42
5.2.1 间歇采样转发抗干扰 42
5.2.2 重复转发抗干扰 44
5.2.3 逐次转发抗干扰 45