星載聚束式SAR子孔徑成像處理方法
A subaperture imaging approach of spaceborne spotlight SAR
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摘要: 該文分析了星載聚束式SAR的信號特性。在分析比較幾種常見聚束式SAR成像算法的基礎(chǔ)上,引入適用于星載聚束式SAR成像的改進(jìn)chirp scaling算法。為解決高分辨率星載聚束式SAR具有的脈沖重復(fù)頻率(PRF)過高,多普勒帶寬中心頻率時變性等問題,深入分析了采用子孔徑方法的必要性及其實現(xiàn)方法,并將子孔徑方法結(jié)合到chirp scaling算法中。最后,通過計算機(jī)仿真,驗證了該算法適用于高分辨率星載聚束式SAR成像處理。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 雷達(dá)成像; 子孔徑處理; Chirp scaling算法
Abstract: Signal properties of spaceborne spotlight SAR. arc; discussed. Based on the analyses of a few .spotlight imaging algorithm, a modified chirp scaling algorithm for spaceborne spotlight SAR is proposed. Besides, a subaperture method is combined with the algorithm. In order to resolve high Pulse Repetition Frequency (PR.F) and the time-variant of Doppler center frequency, etc., the necessity and implementation approach of the subaperture method are analyzed thoroughly. The validity of the proposed method is tested by computer simulation. -
W.G. Carrara, R. S. Goodman, R. M. Majewski, Spotlight Synthetic Aperture Radar, Boston,Artech House, 1995, 5-9.[2]黃巖,李春升,陳杰,周蔭清,高分辨星載SAR改進(jìn)Chirp Scaling成像算法,電子學(xué)報,2000,28(3),35-38.[3]G.W. Davidson, I. Cumming, Signal properties of spaceborne squint-mode SAR, IEEE Trans.on Geosci. Remote Sensing, 1997, 35(3), 611-617.[4]C. Prati, F. Rocca, Focusing SAR data with time-varying Doppler centroid, IEEE Trans. on Geosci. Remote Sensing, 1992, 30(3), 550 559.[5]Tat Soon Yeo, Ngee Leng Tan, Cheng Bo Zhang, Yi Hui Lu, A new subaperture approach to high squint SAR processing, IEEE Trans. on Geosci. Remote Sensing, 2001, 39(5), 954-968.[6]黃巖,高分辨率星載合成孔徑雷達(dá)成象處理技術(shù)研究,[博士論文],北京航空航天大學(xué),1999,第5章.[7]J. Mitternayer, A. Moreira, O. Loffeld, Spotlight SAR data proces sing using the frequency scaling algorit hm, IEEE Trans. on Geosci. Remote Sensing, 1999, 37(5), 2198-2214. -
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