ISAR Imaging of Targets With Complex Motions Based on the Keystone Time-Chirp Rate Distribution
ISAR Imaging of Targets With Complex Motions Based on the Keystone Time-Chirp Rate Distribution
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DOI：
10.1109/lgrs.2013.2291992
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发表时间：
2014-07-01
影响因子：
4.8
通讯作者：
Liu, Qing Huo
中科院分区：
文献类型：
--
作者：
Zheng, Jibin;Su, Tao;Liu, Qing Huo
在逆合成孔径雷达（ISAR）对舰船、飞机等复杂运动目标成像时，方位回波信号可建模为三次相位信号（CPS）。针对复杂运动目标，提出了一种基于梯形时间线性调频速率分布（KTCRD）的ISAR成像算法。与目前已发表的CPS算法相比，KTCRD算法无需搜索过程即可估计多分量CPS的参数，且具有较高的抗噪性能和较低的计算量。利用估计的运动参数，可以获得高质量的ISAR图像。在综合模型上的几个仿真例子验证了本文提出的新算法的有效性。
In inverse synthetic aperture radar (ISAR) imaging of targets with complex motions such as fluctuating ships with oceanic waves and high maneuvering airplanes, the azimuth echo signals can be modeled as cubic phase signals (CPSs). In this letter, a new ISAR imaging algorithm based on the keystone time-chirp rate distribution (KTCRD) is proposed for the targets with complex motions. Compared with the recently published algorithms for the CPSs, the KTCRD can estimate the parameters of multicomponent CPSs without searching procedures and can acquire high antinoise performance with a relatively low computational load. With the estimated motion parameters, high-quality ISAR images can be obtained. Several simulation examples on the synthetic model are shown to validate the effectiveness of the new algorithm presented in this letter.