超低空目标与粗糙面复合散射的波束追踪算法
Beam-tracking algorithm for composite scattering between low altitude targets and rough surface
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摘要: 根据高频区目标及粗糙面局部表面的散射波束较窄的特征,结合射线追踪及电磁流迭代方法,给出了一种快速计算超低空目标与粗糙面复合多次散射的波束追踪算法,并利用该算法仿真计算了金属平板、球等目标与粗糙面近场复合散射多普勒回波,其结果与多层快速多极子(MLFMM)结果十分符合;同时在造波水池内对金属平板与水面的复合散射开展了测试验证,计算结果与测试数据趋于一致,说明了该算法的有效性.Abstract: According to the scattering characteristics of target and rough surface in a high frequency region in the presenca a narrow beam illumination, we employ composite multiple scattering beam-tracking algorithm based on the ray tracing method and iterative method of electromagnetic to obtain a quick solution to calculate the near field composite scattering characteristics of target at low altitude and rough surface. Then we calculate the Doppler echoes of the PEC plate and sphere and compare the data with the ones from MLFMM, and find that they are in good agreement with each other. Finally we carry out testing validation of our tank, and calculation resuets are consistent with the test results.
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