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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (3): 322432-322432.doi: 10.7527/S1000-6893.2018.22432

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

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

GUO Baofeng1, SUN Huixian1, HU Wenhua1, YIN Wenlong1, CHEN Guanjun2   

  1. 1. Department of Electronic and Optical Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang 050003, China;
    2. No.32136 Unit, PLA, Zhangjiakou 075000, China
  • Received:2018-06-07 Revised:2018-08-28 Online:2019-03-15 Published:2018-09-30
  • Supported by:
    National Natural Science Foundation of China (61601496)

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: