Nonlinear effect of impaired limiter on synthetic aperture radar
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摘要: 在复杂电磁环境下，当电子学系统的关键器件遭受功能或物理损伤而发生非线性效应时，会导致电子学系统的探测性能下降，严重时可能使系统无法实现预期的功能。以一种对地成像雷达的限幅器为对象，研究了限幅器损伤后的非线性特性信号模型构建方法，较为深入地研究了它对雷达信号处理的影响。理论和仿真分析结果表明，典型电子学系统在关键器件发生非线性变化的情况下，会明显降低成像雷达的性能，如成像不能聚焦和分辨率下降等。Abstract: In the complicated electromagnetic environment, some key devices may be impaired by the nonlinear effect which could reduce the detecting performance of the system, and worst of all result in the failure of the whole system. This paper selects the limiter of one kind of synthetic aperture radar (SAR) to investigate the modeling of nonlinear characteristics and its effect on radar signal processing. Theoretic analysis and computer simulation show that the performance of such a typical electronic system as the SAR under study would be reduced to have bad focusing and low resolving capability by the nonlinear behavior of key devices.
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