雷达有源干扰抑制算法研究
发布时间:2018-09-18 13:49
【摘要】: 雷达是现代战争中重要的利用电磁波探测目标的电子装备。随着雷达电子对抗技术的发展,电子反对抗技术作为影响雷达生存的重要因素引起国内外雷达工作者的广泛关注。 本论文以线性调频脉冲压缩体制的对空情报雷达为对象,围绕有源干扰抑制技术展开研究。重点在有源加性复合干扰与新型干扰的干扰抑制算法研究,以及对常规有源干扰现有抑制算法的验证。本文的主要工作如下: 第一、研究了典型有源干扰的产生机理与作用机理。包括常规有源干扰、有源加性复合干扰与灵巧噪声干扰。有源加性复合干扰与灵巧噪声干扰是本文的主要研究对象,通过仿真分析了其信号特征,并从理论上推导了其时域表达式与干扰性能。 第二、针对有源加性复合干扰,研究了基于相位扰动原理的干扰抑制方法。在结合LFM信号特征的基础上,采用对雷达发射信号的前后脉冲分别附加近似正交的扰动相位,再通过相应于前一脉冲重复周期的匹配滤波器将复合干扰中的欺骗干扰成分加强,然后对脉冲压缩结果加以“惩罚”,最后采用匹配滤波逆运算恢复出目标回波信号。 第三、考虑到加性复合干扰的产生机理与信号特征,研究了雷达有源加性复合干扰分步抑制算法。由于该算法抑制复合干扰直观,且可以运用已有的常规干扰抑制算法,故算法有一定的实用价值。该算法存在的不足之处是需要已知复合干扰信号的类型,在实际使用时需要在雷达系统中将该算法配合干扰类型识别以及抗干扰措施选取使用。 第四、研究了一种基于LFM信号解线调的灵巧噪声干扰抑制算法。该算法以雷达前一脉冲重复周期的接收信号为参考,求得其与当前脉冲重复周期雷达接收信号的差拍信号,将目标信号移至低频,通过滤波抑制干扰,再通过差拍逆运算可以恢复出目标回波信号。 第五、构建与实际情况相似的仿真平台,对现有常规有源干扰抑制算法进行验证。仿真平台的构建是通过适当修改某雷达站某次对抗现场试验中所采用的某型雷达、某型压制式干扰机与某型欺骗式干扰机的实际参数得到的。仿真验证的干扰抑制算法包括:基于对消的噪声调频干扰抑制算法与基于LFM雷达Stretch处理的距离假目标干扰抑制算法。
[Abstract]:Radar is an important electronic equipment for detecting targets by electromagnetic wave in modern warfare. With the development of radar electronic countermeasure technology, electronic anti-rejection technology, as an important factor affecting radar survival, has attracted extensive attention of radar workers at home and abroad. In this thesis, the active jamming suppression technology is studied based on the linear frequency modulation pulse compression radar. Emphasis is placed on the study of active additive complex jamming and new jamming suppression algorithms, as well as the verification of existing active jamming suppression algorithms. The main work of this paper is as follows: first, the mechanism of generation and action of typical active jamming is studied. It includes conventional active jamming, active additive complex jamming and dexterous noise jamming. Active additive complex interference and dexterous noise interference are the main research objects in this paper. The signal characteristics are analyzed by simulation, and the time domain expression and jamming performance are derived theoretically. Secondly, the interference suppression method based on phase perturbation principle is studied for active additive complex jamming. Based on the characteristics of LFM signal, the deceptive jamming component in the composite jamming is strengthened by using the matching filter corresponding to the previous pulse repetition period by adding approximately orthogonal perturbed phase to the front and rear pulses of the radar transmitted signal, and then using the matching filter corresponding to the previous pulse repetition period to strengthen the deceptive jamming component in the composite jamming. Then the pulse compression results are "punished", and the target echo signal is recovered by the inverse operation of matched filter. Thirdly, considering the generation mechanism and signal characteristics of additive compound jamming, the step suppression algorithm of radar active additive composite jamming is studied. Since the algorithm is intuitive in suppressing complex interference and can be used in the conventional interference suppression algorithm, it has some practical value. The shortcoming of this algorithm is that it needs to know the type of complex jamming signal, and it needs to be used in radar system to identify the jamming type and select anti-jamming measures. Fourthly, a dexterous noise interference suppression algorithm based on LFM signal delinearization is studied. The algorithm takes the received signal of the previous pulse repetition period as the reference, obtains the beat signal between the received signal of the radar and the current pulse repetition period radar, moves the target signal to the low frequency, and suppresses the interference by filtering. Then the target echo signal can be recovered by the beat inversion operation. Fifthly, a simulation platform similar to the actual situation is constructed to verify the existing conventional active jamming suppression algorithms. The simulation platform is constructed by modifying the actual parameters of a certain radar, a certain type of suppression jammer and a certain type of deceptive jammer, which are used in the field test of a certain radar station. The simulation results show that the jamming suppression algorithms include noise FM jamming suppression algorithm based on cancellation and range false target jamming suppression algorithm based on LFM radar Stretch processing.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2010
【分类号】:TN974
本文编号:2248114
[Abstract]:Radar is an important electronic equipment for detecting targets by electromagnetic wave in modern warfare. With the development of radar electronic countermeasure technology, electronic anti-rejection technology, as an important factor affecting radar survival, has attracted extensive attention of radar workers at home and abroad. In this thesis, the active jamming suppression technology is studied based on the linear frequency modulation pulse compression radar. Emphasis is placed on the study of active additive complex jamming and new jamming suppression algorithms, as well as the verification of existing active jamming suppression algorithms. The main work of this paper is as follows: first, the mechanism of generation and action of typical active jamming is studied. It includes conventional active jamming, active additive complex jamming and dexterous noise jamming. Active additive complex interference and dexterous noise interference are the main research objects in this paper. The signal characteristics are analyzed by simulation, and the time domain expression and jamming performance are derived theoretically. Secondly, the interference suppression method based on phase perturbation principle is studied for active additive complex jamming. Based on the characteristics of LFM signal, the deceptive jamming component in the composite jamming is strengthened by using the matching filter corresponding to the previous pulse repetition period by adding approximately orthogonal perturbed phase to the front and rear pulses of the radar transmitted signal, and then using the matching filter corresponding to the previous pulse repetition period to strengthen the deceptive jamming component in the composite jamming. Then the pulse compression results are "punished", and the target echo signal is recovered by the inverse operation of matched filter. Thirdly, considering the generation mechanism and signal characteristics of additive compound jamming, the step suppression algorithm of radar active additive composite jamming is studied. Since the algorithm is intuitive in suppressing complex interference and can be used in the conventional interference suppression algorithm, it has some practical value. The shortcoming of this algorithm is that it needs to know the type of complex jamming signal, and it needs to be used in radar system to identify the jamming type and select anti-jamming measures. Fourthly, a dexterous noise interference suppression algorithm based on LFM signal delinearization is studied. The algorithm takes the received signal of the previous pulse repetition period as the reference, obtains the beat signal between the received signal of the radar and the current pulse repetition period radar, moves the target signal to the low frequency, and suppresses the interference by filtering. Then the target echo signal can be recovered by the beat inversion operation. Fifthly, a simulation platform similar to the actual situation is constructed to verify the existing conventional active jamming suppression algorithms. The simulation platform is constructed by modifying the actual parameters of a certain radar, a certain type of suppression jammer and a certain type of deceptive jammer, which are used in the field test of a certain radar station. The simulation results show that the jamming suppression algorithms include noise FM jamming suppression algorithm based on cancellation and range false target jamming suppression algorithm based on LFM radar Stretch processing.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2010
【分类号】:TN974
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