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15 October 2015 Refocusing of ground moving targets for range migration algorithm in FMCW SAR
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Frequency-Modulated Continuous-Wave Synthetic Aperture Radar (FMCW SAR) is a promising compact remote imaging sensor. Its detection and refocusing of the ground moving targets is discussed in this paper in order to provide FMCW SAR system with simultaneous moving targets indication application. A moving target indication method by focusing is derived and presented. This method is derived based on range migration algorithm taking into account the moving target range cell walk. To discriminate the target optimally, the concept of relative motion is extended to FMCW SAR. Due to continuous transmitting and receiving at all time, the standard “stop-go” approximation is not valid here. By searching the relative velocity, the moving target can be focused accurately, equivalent as a fixed target focused in squint mode. The maximum output corresponds to the best matched parameters. Thus the matched targets are detected and the others suppressed.
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Pu Cheng, Qin Xin, Jianwei Wan, and Zhan Wang "Refocusing of ground moving targets for range migration algorithm in FMCW SAR", Proc. SPIE 9642, SAR Image Analysis, Modeling, and Techniques XV, 96420R (15 October 2015);

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