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A SAR imaging method with sparse aperture and frequency using stepped-frequeney waveform
Received date: 2014-06-05
Revised date: 2014-08-07
Online published: 2014-09-01
Supported by
National Natural Science Foundation of China (61201369, 61471386); China Postdoctoral Science Foundation (2012M521897); Doctoral Foundation of Air Force Engineering University
Stepped-frequency waveforms (SFWs) can use the digital signal processing to obtain high range resolution with relatively narrow instantaneous bandwidth, but they also have the disadvantages of poor anti-jamming capability and long-time period of transmission. And in the coherent integration time, it frequently occurs that some of echo data are missing. In this paper, a novel synthetic aperture radar (SAR) imaging method with sparse aperture and frequency is proposed based on sparse stepped-frequency waveforms (SSFWs). Firstly, the signal model for SSFWs SAR imaging is analyzed and then the range compression is achieved by using the compressed sensing theory. Secondly, as to the sparse aperture data, the imaging operator and the CS-based imaging scheme are constructed to implement the range cell migration correction and azimuth compression simultaneously. Compared with the traditional SAR imaging method of SFWs, much smaller number of frequencies and smaller amount of imaging data are required for SAR imaging by using the proposed method. Finally, the effectiveness of the proposed method is proved by the simulation and experimental results.
GU Fufei , ZHANG Qun , LOU Hao , YANG Qiu , CHEN Yichang . A SAR imaging method with sparse aperture and frequency using stepped-frequeney waveform[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(4) : 1221 -1229 . DOI: 10.7527/S1000-6893.2014.0177
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