非線性CS算法的前斜視SAR成像
Nonlinear CS algorithms for forward-squint SAR imaging
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摘要: 針對SAR的前途斜視工作模式，該文建立了雷達(dá)信號的回波模型，詳細(xì)分析了回波信號的瞬時方位頻率和瞬時多普勒頻率及距離Chirp斜率對方位頻率的影響。然后結(jié)合經(jīng)典的CS算法，提出了一種基于前斜視的改進(jìn)CS算法，并利用該方法進(jìn)行了仿真試驗。理論分析和仿真結(jié)果表明，該方法更符合斜視SAR的幾何關(guān)系，能有效地進(jìn)行距離壓縮、距離徒動校正和方位聚焦，改善了成像質(zhì)量。
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關(guān)鍵詞:
- 合成孔徑雷達(dá);前斜視;CS算法;距離Chirp斜率
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. -
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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