本文選題：TOPSAR + 非均勻掃描��； 參考：《電視技術(shù)》2015年21期

【摘要】：由于傳統(tǒng)TOPSAR具有均勻的天線掃描速度,在掃描范圍較大的情況下,靠近圖像邊緣的目標(biāo)被天線波束照射的時間較短,圖像中心部分的目標(biāo)照射時間較長,從而導(dǎo)致了TOPSAR圖像分辨率不一致,針對上述問題提出一種非勻速掃描的TOPSAR成像方法,根據(jù)TOPSAR掃描幾何模型得到圖像分辨率與掃描速度的數(shù)學(xué)關(guān)系,通過控制天線的旋轉(zhuǎn)角速度,使場景中方位向不同位置的點目標(biāo)積累時間相同,從而保證了所得SAR圖像具有相同的方位分辨率。仿真結(jié)果和分析表明,該方法有效地保證了TOPSAR圖像分辨率的一致性。
[Abstract]:Because the traditional TOPSAR has uniform antenna scanning speed, when the scanning range is large, the target near the edge of the image is illuminated by the antenna beam for a shorter time, and the target in the center part of the image has a longer exposure time. Therefore, the resolution of TOPSAR image is inconsistent. In view of the above problems, a non-uniform scanning TOPSAR imaging method is proposed. According to the TOPSAR scanning geometry model, the mathematical relationship between the image resolution and the scanning speed is obtained, and the rotation angular velocity of the antenna is controlled. The accumulation time of points and targets in different azimuth positions in the scene is the same, thus ensuring the same azimuth resolution of the obtained SAR images. Simulation results and analysis show that this method can effectively guarantee the consistency of TOPSAR image resolution.
【作者單位】： 桂林電子科技大學(xué)信息科技學(xué)院;
【基金】：航空基金項目(201101811004)
【分類號】：TN957.52

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1 徐偉;鄧云凱;;高效星載TOPSAR場景回波信號模擬方法[J];電子與信息學(xué)報;2012年01期

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本文編號：1940045