求翻译：然后根据天线散射的周期性，包括接收、发射切换的周期性和天线旋转的周期性，提取了天线的周期参数特征，电磁计算仿真结果表明特征提取算法的有效性；是什么意思？

正在翻译，请等待...

正在翻译，请等待...

Then the basis antenna scattering periodicity, including the receive, the launch cut periodicity and the antenna rotation periodicity, withdrew the antenna cyclical parameter characteristic, the electromagnetism computation simulation result has indicated the characteristic extraction algorithm the

And according to the periodicity of antenna scattering, including reception, periodicity of emission switch and antenna rotation cyclical and extraction cycle parameters characteristic of the antennas, electromagnetic simulation results show that the validity of a feature extraction algorithm of cal

And according to the periodicity of antenna scattering, including reception, periodicity of emission switch and antenna rotation cyclical and extraction cycle parameters characteristic of the antennas, electromagnetic simulation results show that the validity of a feature extraction algorithm of cal