本文選題：合成孔徑雷達(dá) + 運(yùn)動(dòng)目標(biāo)檢測(cè)��； 參考：《西安電子科技大學(xué)》2015年碩士論文

【摘要】：運(yùn)動(dòng)目標(biāo)的檢測(cè)和參數(shù)估計(jì)是雷達(dá)信號(hào)處理的重點(diǎn)方向�；诙嗤ǖ篮铣煽讖嚼走_(dá)(SAR)系統(tǒng)的運(yùn)動(dòng)目標(biāo)檢測(cè)方法能利用空域自由度實(shí)現(xiàn)有效的雜波抑制,完成地面慢速目標(biāo)的檢測(cè)(GMTI)。然而隨著通道數(shù)目的增加,數(shù)據(jù)量急劇增大,造成雷達(dá)系統(tǒng)數(shù)據(jù)處理負(fù)擔(dān)變大。壓縮感知(CS)理論可以在欠采樣條件下實(shí)現(xiàn)信號(hào)的無(wú)失真重構(gòu),并且運(yùn)動(dòng)目標(biāo)信號(hào)在空間上通常具有稀疏性,因此,研究稀疏信號(hào)體制下的SAR動(dòng)目標(biāo)檢測(cè)技術(shù)對(duì)提升雷達(dá)系統(tǒng)空間監(jiān)視能力具有重要意義。本文主要研究基于稀疏重構(gòu)的多通道SAR系統(tǒng)的動(dòng)目標(biāo)檢測(cè)方法,主要內(nèi)容如下:稀疏重構(gòu)算法一般存在計(jì)算量過(guò)大的問(wèn)題,難以直接應(yīng)用于實(shí)際系統(tǒng)。本文借鑒零空間調(diào)整(NST)思想,提出一種快速的雙通道SAR動(dòng)目標(biāo)檢測(cè)方法。該方法聯(lián)合雙通道數(shù)據(jù)進(jìn)行雜波抑制,利用NST算法實(shí)現(xiàn)動(dòng)目標(biāo)檢測(cè),提高了目標(biāo)檢測(cè)的精度和穩(wěn)健性,并減小了算法的計(jì)算復(fù)雜度。動(dòng)目標(biāo)位置需標(biāo)定在高分辨SAR圖像上,盡管運(yùn)動(dòng)目標(biāo)在空間上滿足稀疏性,場(chǎng)景是非稀疏的,因此不能同時(shí)實(shí)現(xiàn)高分辨率SAR成像與動(dòng)目標(biāo)檢測(cè)定位。針對(duì)該問(wèn)題,首先對(duì)滿采樣通道采用交替方向法(ADM)重構(gòu)場(chǎng)景和目標(biāo)的SAR圖像,利用所成SAR圖像對(duì)稀疏采樣通道進(jìn)行雜波抑制,最后基于NST技術(shù)實(shí)現(xiàn)運(yùn)動(dòng)目標(biāo)檢測(cè)。仿真結(jié)果說(shuō)明本算法具有良好的動(dòng)目標(biāo)檢測(cè)性能。針對(duì)各通道稀疏重構(gòu)時(shí)重組誤差的不一致性,給出一種適用于稀疏采樣模型的多通道動(dòng)目標(biāo)檢測(cè)方法,大大提高了算法對(duì)重組誤差的穩(wěn)健性;在此基礎(chǔ)上,提出一種稀疏采樣多通道SAR的運(yùn)動(dòng)目標(biāo)徑向速度估計(jì)方法,該方法首先對(duì)各通道進(jìn)行稀疏重構(gòu)得到SAR圖像,再通過(guò)對(duì)雙通道數(shù)據(jù)進(jìn)行ATI幅相聯(lián)合檢測(cè)實(shí)現(xiàn)運(yùn)動(dòng)目標(biāo)定位,最終通過(guò)陣列DOA方法實(shí)現(xiàn)目標(biāo)的高精度徑向速度估計(jì)。
[Abstract]:Detection and parameter estimation of moving targets are the key points of radar signal processing. The moving target detection method based on multi-channel synthetic aperture radar (SAR) system can effectively suppress clutter by using spatial freedom and complete ground slow target detection (GMTI). However, with the increase of the number of channels, the amount of data increases rapidly, which makes the data processing burden of radar system become larger. Compression sensing (CS) theory can realize the distortion free reconstruction of the signal under the condition of under-sampling, and the moving target signal is usually sparse in space, so, It is very important to study the SAR moving target detection technology in sparse signal system to improve the space surveillance capability of radar system. In this paper, the moving target detection method of multi-channel SAR system based on sparse reconstruction is studied. The main contents are as follows: the sparse reconstruction algorithm is difficult to be directly applied to practical systems because of its large computational complexity. Based on the idea of null space adjustment (NST), a fast dual channel SAR moving target detection method is proposed in this paper. This method combines dual-channel data for clutter suppression and uses NST algorithm to realize moving target detection. It improves the accuracy and robustness of target detection and reduces the computational complexity of the algorithm. Moving targets need to be calibrated on high resolution SAR images. Although moving targets satisfy sparsity in space, the scene is non-sparse, so high resolution SAR imaging and moving target detection and localization cannot be realized at the same time. To solve this problem, alternate direction method (ADM) is used to reconstruct the scene and target SAR images, and the sparse sampling channel is suppressed by the SAR images. Finally, the moving target detection is realized based on NST technology. Simulation results show that the algorithm has good performance in moving target detection. Aiming at the inconsistency of recombination error in sparse reconstruction of every channel, a multi-channel moving target detection method suitable for sparse sampling model is presented, which greatly improves the robustness of the algorithm to the recombination error. A method for estimating the radial velocity of moving targets based on sparse sampling multi-channel SAR is proposed. Firstly, the SAR images are obtained by sparse reconstruction of each channel, and then the moving target location is realized by ATI amplitude-phase joint detection of two-channel data. Finally, high precision radial velocity estimation is realized by array DOA method.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN957.51

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