距離-多普勒方法中的幾種插值算法比較
Comparison of Several Interpolation Algorithms in Range-Doppler Method
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摘要: 在高分辨率合成孔徑雷達(dá)(SAR)信號(hào)處理中,距離遷移校正是成像處理的關(guān)鍵步驟。距離-多普勒(R-D)方法在R-D域中通過(guò)插值處理來(lái)完成遷移校正。本文首先對(duì)距離遷移問(wèn)題進(jìn)行分析,然后研究R-D方法中常用的三種插值算法:最鄰域近似、拉格朗日插值和sinc插值,給出它們的一般表達(dá)式,比較其運(yùn)算量;最后通過(guò)計(jì)算機(jī)仿真,以點(diǎn)目標(biāo)為例,分析它們對(duì)成像結(jié)果的影響。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 距離-多普勒方法; 距離遷移校正; 插值算法
Abstract: Range migration correction (RMC) is an important procedure in high resolution synthetic aperture radar signal processing. Range-Doppler method carries out RMC by interpolation in range-Doppler domain. This paper first analyzes the range migration problem, makes research on three common used interpolation algorithms: nearest neighbor approxima-tion, Lagrange polynornial interpolation and sinc function interpolation. The general formulas of three algorithms are presented. Their calculating volume is compared. Finally, the computer imaging simulations of point target are used to analyze the algorithms effect on resulted image. -
Wu C, et al., Modeling and a correlation algorithm for spaceborne SAR signals, IEEE Trans. on AES., 1982, AES-18(5), 563-574.[2]R.K. Raney, H. Runge, R. Bamler, I. G. Cumming, F. H. Wong, Precision SAR processing using chirp scaling, IEEE Trans. on GRS., 1994, GRS-32(4), 786-799.[3]禹衛(wèi)東,合成孔徑雷達(dá)信號(hào)處理研究,博士學(xué)位論文,南京,南京航空航天大學(xué),1997,第四章.[4]徐士良,計(jì)算機(jī)常用算法,北京,清華大學(xué)出版社,1995,177-178. -
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