本文選題：雙基前視SAR　切入點：BP算法　出處：《電子科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：雷達前視成像在自主著陸、物資空投及戰(zhàn)場偵察等方面有著廣闊的應(yīng)用前景。雙基合成孔徑雷達Bistatic Synthetic Aperture Radar,B)(iSAR收發(fā)天線分置在兩個平臺,構(gòu)型靈活,適當?shù)膸缀尾季謼l件下可以實現(xiàn)單基SAR不能完成的前視成像。以后向反投影(Back Projection,BP)算法為代表的SAR時域成像算法相對于頻域算法具有適用于任何構(gòu)型的優(yōu)勢,但BP算法運算量較大,所以研究雙基前視SAR快速時域成像算法具有重要意義。本論文圍繞著雙基前視SAR快速時域成像算法的相關(guān)問題,主要開展了以下的研究工作:(1)研究了移不變雙基前視聚束SAR構(gòu)型下的回波性質(zhì)和成像二維分辨率特性,為后續(xù)算法的分析和設(shè)計奠定了基礎(chǔ)。(2)研究了雙基前視SAR的BP成像算法和基于因式分解的快速后向反投影(Fast Factorized Back Projection,FFBP)算法,并實現(xiàn)了兩種算法的精確成像。(3)提出了基于方位等間距坐標的FFBP算法。根據(jù)雙基前視SAR等距-等多普勒線的分布,每級子圖像的方位向由在局部橢圓極坐標系采樣變?yōu)樵诘孛嬷苯亲鴺讼挡蓸印亩鴮崿F(xiàn)了對FFBP算法運算效率上的優(yōu)化。(4)研究了基于FFBP算法的運動補償方法。對SAR收發(fā)雙站進行運動誤差建模,通過對回波相位補償,將彎曲的實際路徑補償?shù)嚼硐胫本�路徑,使FFBP算法在航姿存在一定誤差的情況下仍然可以成像。(5)提出了雙基前視SAR擴展場景回波時域快速模擬方法。通過對擴展場景中像素點的合并,對回波的插值、近似以及疊加操作,完成回波的模擬。本算法相對于傳統(tǒng)回波時域模擬算法在運算效率上提升顯著。以上算法均通過仿真實驗進行了驗證。結(jié)果表明,本論文提出的算法能夠很好的完成雙基前視SAR成像和擴展場景的回波模擬。
[Abstract]:Radar forward imaging has a broad application prospect in the fields of autonomous landing, material airdrop and battlefield reconnaissance, etc. The antenna of Bistatic Synthetic Aperture Radaran / Bistatic is separated on two platforms, and the configuration is flexible. The forward imaging can be realized under the condition of proper geometric layout. The back projection back projection back projection (BP) algorithm represents the SAR time-domain imaging algorithm, which is suitable for any configuration compared with the frequency-domain algorithm. But the computation of BP algorithm is large, so it is very important to study bistatic forward SAR fast time domain imaging algorithm. This paper focuses on the related problems of bistatic forward looking SAR fast time domain imaging algorithm. In this paper, the following research work is carried out: (1) the echo properties and the two-dimensional resolution characteristics of the imaging in a bistatic forward focusing SAR configuration are studied. The BP imaging algorithm of bistatic forward looking SAR and fast backward Factorized Back projection algorithm based on factorization are studied. The FFBP algorithm based on azimuth and equidistant coordinates is proposed. According to the distribution of bistatic forward looking SAR isometric and equal Doppler lines, The azimuth direction of each sub-image is changed from sampling in the local elliptical polar coordinate system to sampling in the ground right-angle coordinate system. Thus, the optimization of the computational efficiency of the FFBP algorithm is realized.) the motion compensation method based on the FFBP algorithm is studied, and the motion compensation method based on the SAR algorithm is studied. The model of motion error is established by sending and receiving two stations. By compensating the phase of the echo, the actual curve path is compensated to the ideal straight line path. So that the FFBP algorithm can still be imaged even if there is a certain error in heading and attitude. (5) A fast simulation method for echo of bistatic forward looking SAR extended scene in time domain is proposed. By combining pixel points in extended scene, interpolation of echo is proposed. Compared with the traditional echo time domain simulation algorithm, the computational efficiency of this algorithm is significantly improved. The above algorithms are verified by simulation experiments. The results show that, The algorithm proposed in this paper can well perform bistatic forward SAR imaging and echo simulation of extended scenes.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN957.52

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本文編號：1566937