本文選題：動目標顯示 + 動目標檢測　； 參考：《西安電子科技大學》2015年碩士論文

【摘要】：雜波抑制技術是雷達在雜波背景下檢測目標的一種重要手段。如何對海面的小型低速目標進行有效的檢測是一個值得研究的問題。本文圍繞慢動雜波自適應濾波器設計及幀間相關處理技術展開了相關的研究。主要工作概括如下:1、動目標顯示濾波器設計方法研究。從雜波特性的分析出發(fā),介紹了傳統(tǒng)的延遲線對消器和優(yōu)化設計的MTI濾波器,著重仿真分析了預測誤差法、特征矢量法和零點分配法三種MTI濾波器設計方法。據(jù)此介紹了變T模式下時變級聯(lián)濾波器的設計方法。為了使MTI濾波器獲得更好的通帶性能,分析了使用遺傳算法優(yōu)化參差碼的方法。然后詳細介紹了三種雜波多普勒頻率的估計方法,并進行了仿真對比分析。仿真結(jié)果表明:雜波較強時,應采用零點分配法設計MTI濾波器;雜波較弱時,可以采用預測誤差法或特征矢量法設計MTI濾波器。同時變T模式下,可以采用線性相位法估計雜波多普勒頻率,等T模式下可以采用相關函數(shù)法估計雜波多普勒頻率。最后對實測數(shù)據(jù)進行了初步的處理。2、動目標檢測濾波器設計和低速目標檢測研究。詳細介紹了幾種MTD濾波器的設計方法,包括MTI級聯(lián)FFT濾波器組、點多普勒濾波器組以及等間隔多普勒濾波器組。然后介紹了基于超雜波檢測和基于零頻抑制兩種低速目標檢測方法,并進行了仿真分析。仿真結(jié)果表明了兩種方法的有效性。3、幀間相關處理技術研究。首先介紹了對雷達回波數(shù)據(jù)進行積累的兩種方法,并進行了仿真對比分析。然后對幀間相關處理中目標的回波模型進行了詳細的分析,在此基礎上給出了幀間相關處理的一般流程,對處理流程中的脈沖選取、脈壓、MTD處理、目標跨越距離單元數(shù)補償以及幀間非相干積累這五個模塊進行了詳細介紹,并進行了仿真分析。最后結(jié)合實測數(shù)據(jù)處理,驗證了該處理流程的有效性。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN95;TN713

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