In Situ Measurement of Radiated Emissions Based on Array Signal Processing and Adaptive Noise Cancellation

Peng LI  Zhongyuan ZHOU  Mingjie SHENG  Qi ZHOU  Peng HU  

IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.4   pp.371-379
Publication Date: 2019/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018ECP5052
Type of Manuscript: PAPER
Category: Electromagnetic Theory
electromagnetic compatibility,  in situ measurement,  array signal processing,  radiated emission,  adaptive noise cancellation,  

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This paper presents a method combining array signal processing and adaptive noise cancellation to suppress unwanted ambient interferences in in situ measurement of radiated emissions of equipment. First, the signals received by the antenna array are processed to form a main data channel and an auxiliary data channel. The main channel contains the radiated emissions of the equipment under test and the attenuated ambient interferences. The auxiliary channel only contains the attenuated ambient interferences. Then, the adaptive noise cancellation technique is used to suppress the ambient interferences based on the correlation of the interferences in the main and auxiliary channels. The proposed method overcomes the problem that the ambient interferences in the two channels of the virtual chamber method are not correlated, and realizes the suppression of multi-source ambient noises in the use of fewer array elements. The results of simulation and experiment show that the proposed method can effectively extract radiated emissions of the equipment under test in complex electromagnetic environment. Finally, discussions on the effect of the beam width of the main channel and the generalization of the proposed method to three dimensionally distributed signals are addressed.