| Citation: | HAN Lixun, TIAN Bo, FENG Cunqian, et al. Translation compensation and resolution of ballistic target with precession[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(7): 1459-1466. doi: 10.13700/j.bh.1001-5965.2018.0641(in Chinese)
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The ballistic target will cause superposition and folding of the micro-Doppler curve when moving in the midcourse at high speed, the traditional translation compensation method is not suitable for ballistic target translation compensation. After analyzing the frequency characteristics of each scattering point at the precession, it is found that the frequency at the intersection of the curves is completely caused by the translation. According to this property, a method of using the time-frequency image intersection information to perform translation compensation is proposed. First, the time-frequency skeleton image of the echo signal is obtained, then the Harris corner detection method based on bilateral filter is used to extract the corner points in skeleton and the intersection coordinates in the time-frequency image are obtained. Finally, the coordinates of intersection points are used to estimate the translation parameters for translation compensation. For the problem that the traditional Viterbi algorithm is easy to generate false correlations at the intersection of curves, a segmentation Viterbi algorithm using intersection information is proposed to separate the compensated time-frequency curves. Simulation experiments verify the effectiveness of the proposed method.
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