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为提高试验精度,减小电磁兼容(EMC)半电波暗室中被试品(EUT)的电磁辐射发射试验点位对测试结果的影响,研究了不同试验点位对半电波暗室典型谐振频率电磁信号辐射发射的影响规律。采用几何光学、一致性绕射理论和多路径效应算法对不同试验点位,暗室典型谐振频率电磁信号的传输过程进行数学建模,剔除直射场强影响,综合考虑信号传输过程中产生的反射、折射、绕射和多径等电磁传播效应,给出了数学模型和计算公式。将数学传播模型与剔除直射场影响的试验实测模型计算结果进行比对,验证了数学模型的有效性。该研究为修正被试品在暗室内不同点位进行辐射发射试验的测试结果提供了理论依据,有助于提高被试品电磁辐射发射试验的测试精度。
In order to improve the test accuracy and reduce the influence of electromagnetic emission (EUT) on the test results in electromagnetic compatibility (EMC) semi-anechoic chamber, the effects of different test sites on the typical resonant frequency electromagnetic signals Influence of radiation emission. Geometric optics, consistent diffraction theory and multipath effect algorithm are used to model the transmission process of typical resonant frequency electromagnetic signals of different test sites and darkrooms. The influence of direct field intensity is eliminated, and the reflection, Refraction, diffraction and multipath and other electromagnetic propagation effects, given the mathematical model and calculation formula. Comparing the results of mathematical model and experimentally measured model excluding the influence of direct field, the validity of the mathematical model is verified. The study provides a theoretical basis for testing the test results of radiation emission test at different points in the dark room and helps to improve the test accuracy of the electromagnetic radiation emission test of the test object.