機(jī)載合成孔徑雷達(dá)大斜視高分辨率重疊子孔徑成像算法研究

李勇; 朱岱寅; 朱兆達(dá)

機(jī)載合成孔徑雷達(dá)大斜視高分辨率重疊子孔徑成像算法研究

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出版歷程
- 收稿日期: 2004-12-27
- 修回日期: 2005-09-30
- 刊出日期: 2006-09-19

Study on High Resolution Overlapped Subaperture Imaging Algorithm for High Squint Airborne SAR Processing

摘要

摘要: 該文提出了一種結(jié)合圖像二維幾何失真校正和空變相位誤差補(bǔ)償?shù)拇笮币?、高分辨率機(jī)載合成孔徑雷達(dá)重疊子孔徑成像處理方法。其運(yùn)動(dòng)補(bǔ)償過程不需要實(shí)時(shí)調(diào)整雷達(dá)參數(shù)，易于工程實(shí)現(xiàn)。整個(gè)成像處理過程融合了基于頻譜分析的分步變換技術(shù)，以線性距離多普勒算法生成子孔徑圖像為前提，根據(jù)轉(zhuǎn)臺(tái)成像的基本原理，通過固定參考系下地理坐標(biāo)的變換和定位，實(shí)現(xiàn)了不同子孔徑圖像之間散射點(diǎn)的距離和多普勒對(duì)準(zhǔn)，并有效地補(bǔ)償了空變剩余相位誤差。點(diǎn)目標(biāo)仿真和實(shí)測(cè)數(shù)據(jù)成像結(jié)果證明了該處理方法的有效性。
- 合成孔徑雷達(dá);子孔徑成像處理;幾何失真;運(yùn)動(dòng)補(bǔ)償
Abstract: A high-resolution subaperture imaging algorithm incorporated with the correction of 2-D image geometric distortion and the compensation of spatially-variant phase error for high squint airborne synthetic aperture radar is presented. Each subaperture processing is based on linear range-Doppler algorithm. According to the basic theory of rotating-object imaging, a methodology is developed to realize the range and Doppler alignment of the corresponding scatterers in successive subimages by the geographical coordinate transforming and positioning, while the step transform technique based on SPECAN is employed to obtain the high-resolution image. The point-target simulations and live data processing results show the validity of the proposed approach.

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