关键词: 辐射点定位, 干涉仪, 最小冗余天线阵列, 稀疏重建, 电磁兼容测试

Abstract: Non-cooperative radiant positioning is a difficult and crucial issue in electromagnetic compatibility measurement, which is aimed to find the abnormal radiants on unmanned aerial vehicles (UAVs). In this paper, the EM interfer-ometer combining the time-domain correlation and direction of arrival (DOA) estimation is applied to solve the problem of non-cooperative radiant positioning of unmanned aerial vehicles. By applying the minimum redundant antenna array (MRAA) design and angular resolution enhancement based on the sparse reconstruction algorithm, the proposed method can achieve the high-accuracy positioning of multiple non-cooperative radiant. Simulation experiments show that the radiant positioning accuracy is better than 1 m under ultra-high frequency band (UHF), which can meet the requirements of electromagnetic compatibility diagnosis problems for radiant positioning accu-racy. Further analysis shows that the performance of the proposed method is affected by the number of radiants. Generally speaking, the smaller the number of radiants is, the stabler the algorithm is. For an 8-channel MRAA, the number of radiants should be less than seven to reduce the probability of missing detection or false alarms.

Key words: Radiant positioning, EM Interferometer array, Minimum redundant antenna array, Sparse reconstruction, EMC test