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）. This paper employs interferometer array technology to achieve high-accuracy positioning of broadband random non-cooperative radiants. The proposed method enhances the system’s ability to detect weak signals through time-domain energy accumulation. By utilizing array signal angle estimation technology and optimizing the design of a Minimum Redundant Antenna Array （MRAA）， non-cooperative radiant positioning is realized. Finally， the angular resolution of the interferometer is enhanced through sparse reconstruction algorithm to improve the high-accuracy positioning of multiple non-cooperative radiants. Simulation experiments show that the interferometer array can spatially separate and position multiple broadband random non-cooperative radiants. Through the optimization of the MRAA design combined with sparse reconstruction algorithm， the positioning accuracy for multiple radiants in the Ultra-High Frequency （UHF） band is better than 1 meter， meeting the accuracy requirement for radiant positioning in electromagnetic compatibility diagnosis. Further analysis reveals that the performance of the interferometer array is influenced by the number of external radiants. Generally， the fewer the radiants， the higher the algorithm’s stability. For an 8-channel MRAA， the number of external radiants should be kept below seven to reduce issues of missed detection or false alarms.

Key words: radiant positioning, EM interferometer array, minimum redundant antenna array, sparse reconstruction, EMC test