Development of Direction Finding of Man-made Noise Sources

人为噪声的测向是电磁兼容研究中的一个重要问题，虽然目前已有一些方法，但都存在一些问题，本文提出的方法具有以下优点：（1）它提供了噪声源的快照分布;（2）它是基于对单点多个场分量的测量。计算机模拟表明，利用最大熵的概念，我们可以得到右旋和左旋偏振分量的分布，并且与假定的源的分布符合得很好。最后，我们进行了实验室实验，实验结果与假设的噪声源吻合较好。

Direction finding of man made noises is of essential uimportance in EMC.Though some mthods have so far beenproposed, there are problems with them.The method we proposed, has the following advantages ; (1) it provides us withthe snapshot distribution of noise sources, and (2) it is based on the measurement of multiple field components ata single point. Computer simulations have shown that we can have the distributions of right- and left-handed polarized components by using the maximum entropy concept, and the agreement with the assumed source was found to be good. Further the effect of noise on the image reconstruction was also estimated.Finally we carried out the laboratory experiment and we obtained a good agreement with the assumed source.