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Impact of the weather factors on frequency-domain characteristics of the antennas used for EMC measurement in power systems

Li, Qingmin and Zhang, Li and Siew, Wah Hoon and Wang, Wei and Yan, J.D. (2009) Impact of the weather factors on frequency-domain characteristics of the antennas used for EMC measurement in power systems. In: 2009 Proceedings of the 44th International Universities Power Engineering Conference (UPEC). IEEE, New York. ISBN 9781424468232

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The weather factors with on-site EMC measurement may differ a lot from the standard calibration condition, so it is necessary to analyze the impact of weather factors, such as temperature, humidity and atmosphere pressure, on the measurement accuracy of the antennas. Based on experimental study, digital signal processing, improved vector fitting methods and artificial neural networks (ANN), a comprehensive strategy is presented to analyze and predict the impact of weather factors on antenna's characteristics. Experiments and digital signal processing technology are utilized to obtain the frequency response of an antenna under various weather conditions, and an improved vector fitting method is then proposed to acquire the transfer function of the antenna, while a BP neural network is constructed to establish the nonlinear mapping between the weather factors and the antenna's frequency-domain parameters. Experimental and analyzed results show that, the proposed methodology can cope with the concrete impact from weather factors, and thereby realize effective prediction of the antenna's frequency characteristics with regards to variation of the weather conditions.