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  本文關鍵詞：雷達目標微動參數(shù)估計技術研究　出處：《國防科學技術大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 微動 微多普勒 微距離 參數(shù)估計 循環(huán)相關系數(shù) 高階差值序列 分段平動補償 時頻差值平方和序列

【摘要】：目標微動特征包含目標特有的結構信息、運動信息,可用作目標識別的重要依據(jù),對目標微動特征的研究已成為雷達目標探測與識別領域的一個新的技術熱點。本文重點研究平動條件下微動目標對雷達回波的調(diào)制效應及目標微動參數(shù)估計問題。針對目標平動與微動的耦合特點,提出三種微動參數(shù)估計方法,實現(xiàn)了平動條件下目標的微動參數(shù)估計。第一章介紹課題的研究背景及意義,概括目標微動的研究現(xiàn)狀,從微動目標雷達回波調(diào)制模型、雷達回波分量分離、微動特征提取、平動補償四個方面總結該領域的主要技術途徑。最后介紹本文研究工作和結構安排。第二章重點分析平動條件下雷達微動目標對回波的調(diào)制效應。首先結合空間進動目標的運動模型、散射中心模型和目標散射強度的變化規(guī)律建立了目標的寬窄帶雷達回波調(diào)制模型,在此基礎上深入分析平動條件下微動目標雷達回波的功率調(diào)制特性、微多普勒調(diào)制特性、微距離調(diào)制特性、平動的多普勒調(diào)制特性以及目標平動與微動的耦合作用。第三章研究平動條件下基于雷達窄帶、寬帶信號的目標微動參數(shù)估計方法。對于窄帶信號,首先推導了微多普勒信號的時頻分布的周期性,證明在平動條件下回波時頻分布的周期性將演變?yōu)檠h(huán)周期性,在此基礎上引進循環(huán)相關系數(shù)以刻畫時頻分布的循環(huán)周期性,進而估計出微動周期。對于寬帶信號,首先研究了目標散射中心瞬時距離的提取方法,在此基礎上,提出基于高階差值序列的微動周期估計方法�；谘h(huán)相關系數(shù)和基于高階差值序列的微動周期估計方法實現(xiàn)了平動條件下目標的微動參數(shù)估計。第四章研究復雜平動條件下的微動參數(shù)估計方法。針對目標機動等復雜平動,受數(shù)學中微元法的啟發(fā),提出基于分段平動補償?shù)幕夭ㄆ絼友a償方法,最大限度地補償了目標平動。同時引進一種基于擴展數(shù)據(jù)的時頻計算方法,極大地抑制了時頻分布的邊緣效應,提高了瞬時頻率的估計精度。受具有平移不變性的差值算子的啟發(fā),提出基于時頻差值平方和序列的微動頻率估計方法。時頻差值平方和序列能夠消除目標殘余平動的影響,同時避免了雷達回波分量的分離。分段平動補償和時頻差值平方和序列的結合實現(xiàn)了復雜平動條件下的目標微動參數(shù)估計。第五章總結了論文的主要工作和創(chuàng)新點,指出需要進一步研究的問題。
[Abstract]:Target micro motion feature contains structural information specific to target motion information, can be used as an important basis for the research of target recognition, target micro motion feature has become a new hotspot in the field of technology of radar target detection and recognition. Estimation of modulation effect on the radar echo of micro motion targets this paper focuses on the translational conditions and target motion parameter. According to the coupling characteristics of the target translation and motion estimation method is proposed, three kinds of micro parameters, the motion parameter estimation of target translational conditions. The first chapter introduces the research background and the significance of the topic, research status quo summary of micro motion target, from the micro target radar echo modulation model, separation of radar echo components, micro motion feature extraction, four summarize the main aspects of translational motion compensation technology in the field. Finally this research work arrangement and structure. The second chapter focuses on the analysis of translation conditions The modulation effect of the backscattered wave under the radar target. Firstly the motion model of micro space precession target, variation of scattering center model and target scattering intensity of targets is established the narrowband radar echo modulation model, on the basis of in-depth analysis of translation under the condition of target micro power modulation characteristics of the radar echoes, the modulation characteristics of micro micro Doppler. The distance modulation characteristic, translational Doppler modulation and the goal of translation and fretting coupling. Based on narrowband radar under the third chapter studies the translation conditions, estimate the target motion parameter of wideband signal. For narrowband signals, the frequency distribution of the first periodic micro Doppler signal is proved under the condition of echo in translational periodicity frequency distribution will evolve into the cycle, on the basis of the introduction of circular correlation coefficient in cycle frequency distribution characterization, and The estimated motion period. For broadband signals, firstly study the extraction method of target scattering center instantaneous distance, based on the proposed estimation method of fretting cycle based on high order difference sequence. Based on cyclic correlation coefficient and the method based on motion parameter estimation of target under the condition of translational motion period of high order difference sequences of estimation. Under the condition of complicated translational motion parameter estimation method. The fourth chapter according to the target maneuver complex translation, inspired by the infinitesimal method in mathematics, the echo of translational motion compensation method based on piecewise motion compensation, the maximum compensation target. Translation and introduction of a new calculation method of time-frequency expansion based on the data, greatly reduced the edge effect of time-frequency distribution, improve the estimation precision of instantaneous frequency. Inspired by the difference operator with translational invariance, is proposed based on the time-frequency plane difference Fretting frequency estimation method and sequence. When the frequency difference between square and sequence can eliminate the influence of target motion while avoiding the residual, separation of radar echo components. Combined with a piecewise translational motion compensation and time frequency difference square and sequence to achieve the target motion parameter estimation under complex conditions of translation. The fifth chapter summarizes the main work in this paper and innovation, points out the problems that need further study.

【學位授予單位】：國防科學技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN957.51

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本文編號：1413135