随着干扰机和无源干扰相关硬件技术的更新，干扰机和无源散射体产生的干扰回 波信号与目标回波信号难以分辨，传统的利用时域，空域，频域抗干扰技术已难以对 抗日益完善的干扰技术，利用极化域信息对抗干扰成为了新的焦点领域。本文针对末 制导雷达极化抗干扰问题，对不同的极化干扰利用不同的极化抗干扰手段进行对抗， 对于新型变极化压制式干扰，分析其极化特性，根据干扰和目标的极化特性差异提出 一种基于极化滤波器输出的极化识别量算法。

本文在前人工作的基础上，结合科研项目，从若干个方面研究末制导雷达中几种 固定极化干扰和常见变极化干扰的抗干扰方法，针对新型变极化压制式干扰分析了干 扰的极化特性，并根据极化特性设计了对抗算法。具体工作内容如下：

1、极化基础理论研究。本文首先对完全极化电磁波以及部分极化电磁波的表征 方法以及目标极化散射矩阵表征方法进行介绍，总结完全极化电磁波之间的转换关系。 研究现阶段的几种雷达极化测量体制，分析对比各雷达极化测量体制之间的优缺点。

2、极化滤波器技术。极化滤波技术主要用于抑制极化压制式干扰，首先推导极 化参数估计算法，基于极化参数估计算法，介绍单凹口极化滤波器技术，多凹口极化 滤波器技术以及跟踪式自适应极化滤波器技术。通过 Matlab 仿真验证极化参数估计 的准确性。仿真分析在极化压制式干扰条件下的单凹口极化滤波器性能。在脉内极化 调制变极化压制式干扰环境下分析自适应极化滤波器的性能。

3、极化特征提取识别技术。极化特征提取识别技术主要应用于欺骗式干扰环境 下的目标识别，根据欺骗式干扰种类的不同分为两个研究方向：一是有源欺骗式干扰 环境下的目标识别，仿真分析有源拖曳式干扰和密集变极化欺骗式假目标干扰环境下 的目标识别；二是无源干扰环境下的目标识别，通过实测数据分析电线塔和电力线的 分类识别问题和角反射器干扰环境下的目标舰船识别问题。

4、抗变极化压制式干扰及新型变极化压制式干扰技术。首先针对常见的变极化 干扰及其对抗方法进行仿真分析。然后针对新型变极化压制式干扰，通过实测数据分 析新型变极化压制式干扰的极化特性以及利用传统极化抗干扰手段的抗干扰结果，由 于传统抗干扰手段难以对抗新型变极化压制式干扰，本文根据新型变极化压制式干扰 极化特性提出一种基于极化滤波器输出的极化识别量算法，最后通过仿真实验与传统 对抗方法和近期发表的几种方法进行性能对比分析。仿真验证方法的有效性。

With the update of hardware technology related to jammers and passive jamming, the jamming echo signals generated by jammers and passive scatterers are more and more similar to the target echo signals. The traditional anti jamming technology using time domain, air domain and frequency domain It is difficult to counter the increasingly perfect jamming technology, and using polarization domain information to counter jamming has become a new focus area. In this paper, aiming at the polarization anti jamming problem of the terminal guidance radar, different polarization anti jamming means are used to counteract different polarization jamming. Characteristic Differences presents an algorithm for polarization identification quantities based on the output of polarization filters.

Based on the work of predecessors and combined with scientific research projects, this paper studies the anti jamming methods of several fixed polarization jamming and common variable polarization jamming in the terminal guidance radar from several aspects, and analyzes the jamming for the new variable polarization suppression jamming The polarization characteristics, and the countermeasure algorithm is designed according to the polarization characteristics. The specific work content is as follows: 1. Research on the basic theory of polarization. This paper first introduces the characterization methods of fully polarized electromagnetic waves and partially polarized electromagnetic waves, as well as the characterization method of target polarization scattering matrix, and summarizes the conversion relationship between fully polarized electromagnetic waves. Several radar polarization measurement systems at the present stage are studied, and the advantages and disadvantages of each radar polarization measurement system are analyzed and compared.

2. Polarization filter technology. Polarization filtering technology is mainly used to suppress polarization suppressed jamming. First, the polarization parameter estimation algorithm is introduced and derived. Based on the polarization parameter estimation algorithm, the single-notch polarization filter technology and the multi-notchpolarization filter are introduced. technology and tracking adaptive polarization filter technology. The accuracy of polarization parameter estimation is verified by Matlab simulation. The performance of the single-notch polarization filter under the condition of polarization suppression interference is analyzed by simulation. The performance of adaptive polarimetric filter is analyzed in the interference environment of intrapulse polarization modulation and variable polarization suppression.

3. Polarization feature extraction and recognition technology. The polarization feature extraction and recognition technology is mainly used in the target recognition in the deceptive jamming environment. According to the different types of deceptive jamming, it is divided into two research directions: the first research direction is the target recognition in the active deceptive jamming environment, the simulation Analyzed target recognition under active towed jamming and dense variable polarization deceptive false target jamming environments; the second research direction is target recognition under passive jamming environments, and analyzed the classification and recognition of power towers and power lines through measured data problem and the problem of target ship identification in corner reflector jamming environment.

4. Anti polarization suppression interference and new polarization suppression interference technology. Firstly, a simulation analysis is carried out for common polarization-variable jamming and its countermeasures. Then, for the new type of polarization-variable suppression interference, the polarization characteristics of the new type of polarization-variable suppression interference and the anti jamming results using traditional polarization anti jamming methods are analyzed through the measured data. Suppressive jamming, this paper proposes a polarization recognition algorithm based on the output of the polarization filter according to the polarization characteristics of the new variable polarization suppressive jamming. Finally, the performance is compared with traditional countermeasures and several recently published methods through simulation experiments. Comparative analysis. The simulation verifies the effectiveness of the method.

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