Interferometric Three Dimensional Imaging Method for Space Micro-motion Target Based on Wideband Radar
CHEN Chunhui ZHANG Qun LUO Ying SUN Yuxue
(Institute of Information and Navigation, Air Force Engineering University, Xi’an 710077, China)
(Collaborative Innovation Center of Information Sensing and Understanding, Xi’an 710077, China)
Three dimensional imaging of space micro-motion target has significant advantages on target information awareness, which is crucial to effectively realize space target imaging, classification and recognition. In this paper, through the L type antenna array imaging system, an interferometric three dimensional imaging method for space micro-motion target is proposed based on the improved Particle Swarm Optimization (PSO) algorithm. Firstly, the Doppler effect in the received signal is analyzed, and the corresponding parametric model is established. Then, the Doppler phase term of the received signal is reconstructed by using the proposed optimization method. Through interferometric processing and analyzing the quantitative relationship between interferometric phase difference and real coordinate, the three dimensional coordinates and image can be obtained. Compared with the existing methods, the proposed method can reconstruct the real coordinates and three dimensional image of micro-motion target with and without occlusion effect. It also has good robustness. Finally, simulations validate the effectiveness of the proposed method.
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