Systems Engineering and Electronics ›› 2018, Vol. 40 ›› Issue (1): 23-31.doi: 10.3969/j.issn.1001-506X.2018.01.04

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Time-varying three dimensional imaging for space rotating targets with stepped-frequency chirp signal

SUN Yuxue1,2, LUO Ying1,2,3, ZHANG Qun1,2, HU Jian1#br#

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  1. 1. Information and Navigation College, Air Force Engineering University, Xi’an 710077, China; 
    2. National Lab of Radar Signal Processing, Xidian University, Xi’an 710071, China; 
    3. Collaborative Innovation Center of Information Sensing and Understanding, Xi’an 710077, China
  • Online:2018-01-08 Published:2018-01-08

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Abstract:

Three-dimensional (3-D) imaging is of great significance for space target measurement, cataloging and recognition. Stepped-frequency chirp signal (SFCS) owns narrow instantaneous bandwidth thus its detectable range is relatively large, which makes it ascendant in space surveillance. In this paper, based on SFCS, a time-varying 3-D imaging method for space rotating targets is proposed and some relevant problems are discussed in detail. In the method, with L-shaped three-antenna configuration, corresponding high resolution range profile (HRRP) series of each antenna are first obtained. Then through Hough transform, the curve parameter of each scatter in HRRP series is abstracted and the rotating trajectory is thus obtained. Finally, interferometric processing is conducted of HRRP series on different interferometric planes. The time-varying spatial positions in the azimuth and pitching directions of each target scatter are reconstructed. Combining with the time-varying positions in range direction extracted from HRRPseries, the time-varying 3-D image of target scatters is finally obtained. Simulation results verify the validity and robustness of the proposed method.

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