非线性CS算法的前斜视SAR成像
Nonlinear CS algorithms for forward-squint SAR imaging
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摘要: 针对SAR的前途斜视工作模式，该文建立了雷达信号的回波模型，详细分析了回波信号的瞬时方位频率和瞬时多普勒频率及距离Chirp斜率对方位频率的影响。然后结合经典的CS算法，提出了一种基于前斜视的改进CS算法，并利用该方法进行了仿真试验。理论分析和仿真结果表明，该方法更符合斜视SAR的几何关系，能有效地进行距离压缩、距离徒动校正和方位聚焦，改善了成像质量。Abstract: Based on the forward-squint-looking SAR mode of SAR system, this paper gives the mathematical model of SAR echo signal, and carefully analyses the instantaneous azimuth frequency , the instantaneous Doppler frequency component of the azimuth frequency and the impact of range chirp on azimuth frequency, then combining with the common chirp scal-ing algorithms, proposes an improved chirp scaling algorithm for forward-squint-looking SAR, imaging, and takes the simulated test with the algorithm. The results of theory and simula-tion show that the way is more reasonable for forward-squint-looking SAR geometric relation and can effectively complete range cell migration correction, range compression and azimuth focusing, and improve images quality.
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R.K. Raney, H. Runge, Precision SAR processing using chirp scaling, IEEE Trans. on GRS,1994, GRS-32(4), 786-799.[2]R. Keith Raney, An exact wide field digital imaging algorithm, Int. J. Remote Sensing, 1992,13(5), 991-998.[3]Sun Xiaobing, Yeo Tat Son, The impact of range chirp scaling algorithm, In Proc. IEEE GRS.Symp., IGARSS99, Hanburg, Germany, Jan. 1999, 556-558.[4]R. Keith Raney.[J].A new and fundamental Fourier transform pair, In Proc. IGARSS92, Houston,TX, USA.1992,:-[5]Al. Moreira, Yonghong Huang, Airborne SAR processing of highly squinted data using a chirpscaling approach with Integrated motion compensation, IEEE Trans. on GRS, 1994, GRS-32(5),1029-1040.[6]G.W. Davidson, I. G. Cumming, M. R. Ito, A chirp scaling approach for processing squint modeSAR data, IEEE Trans. on AES, 1996 AES-32(1), 121-133. -
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