基于自适应抗干扰技术的辐射发射现场测量方法

提出了一种具有干扰抑制效果的外场辐射发射测试新方法。该方法通过获取多通道接收数据，利用多重信号分类(multiple signal classification, MUSIC)算法获取受试设备的辐射信号和现场其他干扰信号的波达方向，并采取最小方差无畸变波束形成算法在干扰信号来向形成阵列天线方向图的“零陷”，从而实现对干扰信号空间抑制。结合短时傅里叶变换方法，对不同体制的干扰信号的抑制效果进行时频域仿真。结果表明，该方法在保证受试设备辐射特性无失真的情况下，既能同时抑制多个干扰源，又能有效抑制同频干扰和宽带干扰。

On-site measurement method for radiation emission based on adaptive anti-interference technology

A measurement method for adaptive interference suppression in on-site radiated emission test is proposed.Firstly,the method acquires multi-channel data to achieve the signal directions of arrival(DOAs) of equipment under test(EUT) and interferences by the method of multiple signal classification(MUSIC) spatial spectrum estimation technique.Secondly,a wideband minimum variance distortionless response(MVDR) beam-forming algorithm combined with the short time Fourier transform(STFT) method is taken to form the beam pattern nulls in the directions of interference signals,thus to realize the suppression on interferences.The suppression effects on different kinds of interferences are simulated.The simulation results show that the method could simultaneously suppress multiple interferences,those are narrowband or wideband,continuous or transient,as well as with little distortion to the time-frequency characteristics of EUT’s signals.