一種新的高分辨率寬波束機(jī)載SAR成像算法
doi: 10.11999/JEIT140685
基金項(xiàng)目:
國(guó)家863計(jì)劃項(xiàng)目(2007AA120302)和國(guó)家自然科學(xué)基金(61101200, 61401428)資助課題
A Novel Imaging Algorithm for High-precision and Wide-beam Airborne SAR
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摘要: 目前的頻域成像算法在應(yīng)用于高分辨率寬波束機(jī)載合成孔徑雷達(dá)(SAR)時(shí)不能精確補(bǔ)償運(yùn)動(dòng)誤差，而可以精確成像的時(shí)域算法存在計(jì)算效率低下的問(wèn)題。針對(duì)上述問(wèn)題，該文提出一種新的成像算法。該算法通過(guò)對(duì)信號(hào)2維頻譜進(jìn)行擾動(dòng)操作，將頻域與時(shí)域算法結(jié)合互補(bǔ)，在提高運(yùn)補(bǔ)精度的同時(shí)，也提高了后向投影的計(jì)算效率，從而在應(yīng)用于高分辨率寬波束機(jī)載SAR時(shí)得到成像精度與效率的平衡。通過(guò)仿真和實(shí)際數(shù)據(jù)分析，驗(yàn)證了該算法應(yīng)用于高分辨率寬波束系統(tǒng)的有效性。
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關(guān)鍵詞:
- 合成孔徑雷達(dá) /
- 成像算法 /
- 高分辨率 /
- 寬波束 /
- 信號(hào)擾動(dòng)
Abstract: When applying to a high-precision and wide-beam airborne SAR, the frequency domain imaging algorithms are incapable of accurate Motion Compensation (MoCo), while the precise time domain approaches have the drawback of heavy computation burden. A novel imaging algorithm is proposed to figure out the problem, which combined the frequency domain methods and the time domain ones through a perturbation operation to the two-dimensional spectrum of the signal. The algorithm improves the MoCo precision with the computation efficiency being ameliorated as well, thus balancing the accuracy and efficiency when implements on the high-precision and wide-beam airborne SAR. The results of the simulation and real data are used to validate the effectiveness of the proposed algorithm in application to the high-precision and wide-beam airborne SAR.-
Key words:
- SAR /
- Imaging algorithm /
- High-precision /
- Wide-beam /
- Signal perturbation
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