基于模糊函數(shù)-雷頓變換的SAR運動目標成像
SAR MOVING TARGETS IMAGING BASED ON COMBINED AMBIGUITY FUNCTION AND RADON TRANSFORM
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摘要: 該文從一個新的角度賦予模糊函數(shù)以新的用途。近似為線性調(diào)頻信號的SAR運動目標回波信號的模糊度函數(shù)在模糊平面內(nèi)具有很高的能量集中性。聯(lián)合雷頓變換可以求出線性調(diào)頻信號的調(diào)頻率。在此基礎(chǔ)上本文提出了基于模糊函數(shù)-雷頓變換的SAR運動目標成像算法，計算機仿真結(jié)果驗證了算法的可行性。
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關(guān)鍵詞:
- 合成孔徑雷達(SAR);運動目標成像;模糊函數(shù);雷頓變換
Abstract: A new application of the ambiguity function is given in this paper to resolve the problem of moving targets imaging of SAR.It is well known that the SAR echo can be considered as a linear FM signal,so does the echo of moving targets.The square modulus of linear FM signal has high energy centrality in the ambiguity domain.Its peaks represent straight lines whose slopes equal to the Doppler rates of the moving targets echo signals.The parameters of moving targets can be estimated by applying the Radon transform to the ambiguity function.In this way,the moving targets can be easily detected and imaged.The simulation results prove the effectiveness and feasibility of this new method. -
林茂庸，柯有安．雷達信號理論．北京：國防工業(yè)出版社，1981，87-104．[2]Ristic B,Boashash B. Kernel design for time-frequency signal analysis using the Radon transform. IEEE Trans.on Signal Processing,1993,SP-41(5):1996-2008.[3]Ristic B,Boashash B.Adaptive time-frequency representions based on Radon transform,in Proc.Int.Symp.Signal Processing Its Appl.,Gold Coast,Australia:Aug.,1992,41-44.[4]Barbarossa S,Zanalda A.A combined Wigner-Ville and Hough transform for cross-term su-pression and optimal detection and parameter estimation.Proceeding of IEEE ICASSP92,San Francisco:Mar.,1992,173-176. -
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