某雷达的杂波抑制及帧间相关处理技术研究

发布时间：2018-04-16 18:44

本文选题：动目标显示 + 动目标检测　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：杂波抑制技术是雷达在杂波背景下检测目标的一种重要手段。如何对海面的小型低速目标进行有效的检测是一个值得研究的问题。本文围绕慢动杂波自适应滤波器设计及帧间相关处理技术展开了相关的研究。主要工作概括如下:1、动目标显示滤波器设计方法研究。从杂波特性的分析出发,介绍了传统的延迟线对消器和优化设计的MTI滤波器,着重仿真分析了预测误差法、特征矢量法和零点分配法三种MTI滤波器设计方法。据此介绍了变T模式下时变级联滤波器的设计方法。为了使MTI滤波器获得更好的通带性能,分析了使用遗传算法优化参差码的方法。然后详细介绍了三种杂波多普勒频率的估计方法,并进行了仿真对比分析。仿真结果表明:杂波较强时,应采用零点分配法设计MTI滤波器;杂波较弱时,可以采用预测误差法或特征矢量法设计MTI滤波器。同时变T模式下,可以采用线性相位法估计杂波多普勒频率,等T模式下可以采用相关函数法估计杂波多普勒频率。最后对实测数据进行了初步的处理。2、动目标检测滤波器设计和低速目标检测研究。详细介绍了几种MTD滤波器的设计方法,包括MTI级联FFT滤波器组、点多普勒滤波器组以及等间隔多普勒滤波器组。然后介绍了基于超杂波检测和基于零频抑制两种低速目标检测方法,并进行了仿真分析。仿真结果表明了两种方法的有效性。3、帧间相关处理技术研究。首先介绍了对雷达回波数据进行积累的两种方法,并进行了仿真对比分析。然后对帧间相关处理中目标的回波模型进行了详细的分析,在此基础上给出了帧间相关处理的一般流程,对处理流程中的脉冲选取、脉压、MTD处理、目标跨越距离单元数补偿以及帧间非相干积累这五个模块进行了详细介绍,并进行了仿真分析。最后结合实测数据处理,验证了该处理流程的有效性。
[Abstract]:Clutter suppression is an important method for radar target detection in clutter background.How to detect small-scale low-speed targets is a problem worth studying.This paper focuses on the design of adaptive filter for slow moving clutter and the technology of inter-frame correlation processing.The main work is summarized as follows: 1. Research on the design method of moving target display filter.Based on the analysis of clutter characteristics, the traditional delay line canceller and the optimized MTI filter are introduced. The three design methods of MTI filter, namely, prediction error method, characteristic vector method and zero point assignment method, are simulated and analyzed.Based on this, the design method of time-varying cascade filter in variable T mode is introduced.In order to obtain better passband performance of MTI filters, the genetic algorithm is used to optimize the staggered codes.Then, three kinds of clutter Doppler frequency estimation methods are introduced in detail, and the simulation results are compared.The simulation results show that the MTI filter should be designed by zero distribution method when the clutter is strong, and the MTI filter can be designed by the prediction error method or the characteristic vector method when the clutter is weak.At the same time, the Doppler frequency of clutter can be estimated by linear phase method under variable T mode, and the Doppler frequency of clutter can be estimated by correlation function method in T mode.Finally, the experimental data are processed. 2, the filter design of moving target detection and the research of low speed target detection.Several design methods of MTD filter are introduced in detail, including MTI cascade FFT filter bank, point Doppler filter bank and equal-interval Doppler filter bank.Then two low speed target detection methods based on super clutter detection and zero frequency suppression are introduced and simulated.Simulation results show the effectiveness of the two methods.Firstly, two methods of radar echo data accumulation are introduced, and the simulation results are compared.Then, the echo model of the target in inter-frame correlation processing is analyzed in detail. Based on this, the general process of inter-frame correlation processing is given, and the pulse selection, pulse compression and MTD processing in the processing flow are given.The five modules of target span distance compensation and inter-frame incoherent accumulation are introduced in detail, and the simulation analysis is carried out.Finally, the validity of the process is verified by combining the measured data processing.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN95;TN713

【参考文献】