Interferometric-Processing Based Small Space Debris Imaging
The detection and recognition of small space debris is an important task for space security. This paper proposed an interferometric-processing based imaging method for small space debris. First, based on L-shaped three antennas system, the signal model for interferometric imaging is established. Then aiming at the fact that the size of some space debris is smaller than range resolution, time-frequency analysis is adopted to separate echoes of different scatterers. The mechanism of time-frequency analysis for echo from three antennas is deduced in detail. It is proved that the phase for interferometric processing is reserved in the process of time-frequency analysis. Finally through interferometric processing, the positions and image of scatterers can be reconstructed. Simulations verify the validity of the proposed method.
KeywordsRadar imaging Interferometric processing Space debris Time-frequency analysis Sinusoidal frequency modulation
This work was supported by the National Natural Science Foundation of China under Grant 61571457 and the Science Foundation for Post Doctorate of China under Grant 2015M570815.