脉冲压缩雷达干扰样式分析及效能评估

【作者】 王燚；

【导师】 李玉柏；

【作者基本信息】 电子科技大学 ， 信号与信息处理， 2003， 硕士

【摘要】 本论文讨论了脉冲压缩雷达中两种典型的雷达制式：线性调频雷达和二相编码雷达的干扰。首先，本文分别构建了线性调频和二相编码雷达接收机的模型，并对其做了大量的数学分析。然后在此基础上，通过计算机仿真分析，定量地讨论了射频噪声干扰、连续正弦波干扰、转发移频脉冲干扰以及影响它们干扰品质的因素，并以压制系数为衡量标准，进行了干扰效能分析。射频噪声干扰对脉冲压缩雷达是一种有效干扰，在其带宽等于雷达信号带宽，中心频率对准雷达的中心频率时具有最佳的干扰品质。带宽和中心频率是射频噪声干扰品质的决定因素。单频正弦波干扰对线性调频雷达是一种有效干扰，但对于二相编码雷达无论具有多大的功率在充满二相编码雷达接收机的旁瓣抑制滤波器后也不能压制信号主瓣，因此是一种无效干扰。在对单频正弦波进行噪声调幅后形成的噪声调幅干扰对线性调频雷达和二相编码雷达都是有效干扰，其干扰特性和射频噪声干扰类似。转发移频脉冲干扰对于脉冲压缩雷达是极为有效的干扰。在干扰参数选取适当时，它具有很低的压制系数，同时它可以产生距离欺骗的效果。决定转发移频脉冲干扰品质的是其移频量和与信号脉冲的相对延迟时间。最佳干扰以完全掌握被干扰雷达的特征信息为前提，在理想的情况下，其压制系数为1，且具有最好的干扰效果。但若掌握的信息不够充分，或最佳干扰的某些参数的精度达不到要求，最佳干扰的干扰品质将受到严重的损害。更多还原

【Abstract】 The jamming of two models of pulse compressed radar, Linear frequency coded radar and bi-phase coded radar, are studied in this dissertation.First, we set up the models of Linear frequency coded radar and Two phase coded radar differently, and discuss the models in some degree. Then by the method of computer simulation, the following jamming patterns are made quantitative analysis, Radio-Frequency noise jamming, continuous single tune jamming, continuous noise amplitude-modulated jamming, relayed frequency shift jamming, and the key factor which affect the quality of these jamming patterns. At the same time we studied the jamming efficient on the basis of suppression coefficient.Radio-Frequency noise jamming is an effective jamming to pulse compressed(PC) radar. It shows the best jam quality when it’s bandwidth equals to the jammed signal’s bandwidth and it’s central frequency equals to that of the jammed radar’s receiver. Bandwidth and central frequency are two key factors to it’s quality.Continuous single tune jamming is an effective jamming to linear frequency-modulated radar. However it can not suppress signal output after being full of the sidelobe suppress filter of the jammed bi-phase coded radar, no matter how great the power of it may be. We modulate the amplitude of the continuous single tune jamming by noise and produce the continuous noise-modulated jamming. This kind of jamming is effective to PC radar including linear frequency-modulated radar and bi-phase coded radar. It’s jam characters are similar to Radio-Frequency noise jamming.Relayed frequency shift jamming has good effect on PC radar. While being selected proper parameters, it has very small suppression coefficient. At the same time, it has deceptive effect. The key factors of the Relayed frequency shift jamming to it’s quality are it’s frequency shift amount and the time delay between the jamming pulse and the jammed signal.Optimal jamming is based on the complete character information of the jammed PC radar. In the case of ideal circumstance, it’s suppression<WP=6>coefficient is 1 and it has the best deceptive effect of all jamming patterns. However, if the information is inadequate or the parameters of the jamming are not précis enough, the quality of the kind of jamming will decline badly.更多还原