基于回波數(shù)據(jù)的高分辨力機(jī)載SAR運(yùn)動(dòng)補(bǔ)償
High Resolution Airborne SAR Motion Compensation Based on Echo Data
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摘要: 該文詳細(xì)地分析了基于距離壓縮數(shù)據(jù)的運(yùn)動(dòng)補(bǔ)償和基于復(fù)圖像的運(yùn)動(dòng)補(bǔ)償?shù)臋C(jī)理，提出了基于 回波數(shù)據(jù)的高分辨力機(jī)載SAR運(yùn)動(dòng)補(bǔ)償算法。該算法采用子孔徑技術(shù)，利用修改的最大對(duì)比度法提取子孔徑的多普勒調(diào)頻斜率，作距離壓縮數(shù)據(jù)的時(shí)域運(yùn)動(dòng)補(bǔ)償，然后用PGA作復(fù)圖像的頻域運(yùn)動(dòng)補(bǔ)償。實(shí)錄數(shù)據(jù)的成像實(shí)驗(yàn)表明，該算法能有效地克服單一運(yùn)動(dòng)補(bǔ)償算法的場(chǎng)景依賴性，獲得比較滿意的成像質(zhì)量。
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關(guān)鍵詞:
- 運(yùn)動(dòng)補(bǔ)償; 機(jī)載SAR; 成像; PGA
Abstract: This paper amply analyzes the airborne SAR motion compensation mechanism on the range compression data and complex image data, and proposes a motion compen-sation algorithm for the high resolution airborne SAR. This algorithm makes use of the sub-aperture technique to estimate the sub-apertures Doppler rate with the improved max-imum contrast method, and then performs time-domain motion compensation for range compressing data and executes the frequency-domain motion compensation for complex im-age with PGA method. The raw data imaging result shows that the algorithm can effectively overcome the disadvantage of the scene dependence of the singularity motion compensation algorithm, and improve the SAR image quality. -
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