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中文摘要：
采用子孔径交替收发的工作模式,可以增加沿航迹基线长度和相位中心个数,是提升单平台多通道SAR系统地面动目标检测（GMTI）性能的有效途径。该文在建立交替收发模式下多通道动目标信号模型的基础上,通过分析推导明确了形成GMTI基线的必备条件。以建立的模型和推导为依据,给出了交替收发工作模式的设计考虑,通过对同一系统采用不同天线孔径划分和交替方式下的GMTI性能的比较,说明了合理选择天线孔径划分和交替方式对提升GMTI性能的重要性。仿真和实测数据处理结果验证了结论的正确性。
英文摘要：
Alternate transmission and reception is an effective way to obtain a longer along-track baseline and additional independent phase centers to improve the performance of Ground Moving Target Indication （GMTI） in single-platform multi-channel SAR systems. A theoretic analysis of the signal model of moving targets in multi-channel SAR systems with alternate transmission and reception is made. And the necessary condition for the existence of the along-track baseline is indicated. Based on the signal model and the theoretical derivation, the design consideration of the modes of alternate transmission and reception is given. The comparison of GMTI performance with different antenna partitions and alternating strategies shows that an appropriate antenna partition and alternating strategy is important in improving the GMTI performance. The correctness of the conclusion is experimentally verified by the simulated and real SAR data.
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