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传统的单天线合成孔径雷达(SAR)系统由于没有空间维处理能力很难检测地面慢速目标,而多天线SAR和空时自适应信号处理(STAP)为解决这一问题提供了途径。该文研究长相干处理时间导致回波波达方向和多普勒频率均有变化情况下的STAP方法,给出回波波达方向变化的公式,分析动目标多普勒频谱的变化及STAP方法抑制地杂波性能的仿真结果。
The traditional single-antenna SAR system is difficult to detect slow ground targets because of the lack of space-dimensional processing capability. Multi-antenna SAR and space-time adaptive signal processing (STAP) provide a solution to this problem. This paper studies the STAP method under the condition that the length of coherent processing leads to both the echo arrival direction and the Doppler frequency change, and gives the formula of the variation of the arrival direction of echo, and analyzes the change of Doppler spectrum of dynamic target and the STAP method Simulation results of suppression of ground clutter performance.