双基地角时变下的ISAR等效旋转中心估计

doi:10.7527/S1000-6893.2018.22432

Abstract

Abstract: When range-Doppler algorithm is used in bistatic Inverse Synthetic Aperture Rador (ISAR), migration through resolution cell may occur in bistatic ISAR, affecting the imaging quality. To suppress migration through resolution cell, it is necessary to estimate the equivalent rotation center of the target. Aiming at the problem in the rotation center estimation of the bistatic inverse synthetic aperture radar in the presence of time-varying bistatic angles, a rotation center estimation algorithm is proposed in this paper. Firstly, one-dimensional range image sequences after motion compensation are divided into two groups, obtaining two images separately. Secondly, assuming that a range cell is the equivalent rotation center, we correct the distortion of the two images so that only one angle difference of view exists between the two images. Based on the difference of viewing angle, we rotate one of the images and correlate it with the other image, obtaining the correlation coefficient. Then, assuming the next range cell is the position of the rotation center, we repeat the above steps until the end of the traversal, and the assumed position corresponding to the maximum correlation coefficient is the estimated equivalent rotation center. Finally, the simulations are carried out and the results show that the method in this paper can effectively estimate the rotation center of the bistatic ISAR in the presence of time-varying bistatic angles.

Key words: bistatic ISAR, time-varying bistatic angle, rotation center, distortion correction, image rotation

CLC Number:

GUO Baofeng, SUN Huixian, HU Wenhua, YIN Wenlong, CHEN Guanjun. Rotation center estimation of bistatic ISAR in presence of time-varying bistatic angle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(3): 322432-322432.

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Rotation center estimation of bistatic ISAR in presence of time-varying bistatic angle

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