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Continuous Electromagnetic Emission Measurement Setup with Antenna Position Tracking

机译：天线位置跟踪的连续电磁辐射测量设置

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摘要

For measuring the maximum electromagnetic emissions around equipment many test methods use the frequency domain, traditionally using a super-heterodyne test receiver. However, for large equipment under test the frequency domain method is very time consuming when the measurements are performed at low frequencies, below 150 kHz, where small bandwidth and thus long measurement time is needed. Time-domain measurements are now replacing the traditional super-heterodyne receivers, but the commercial time-domain receivers still use a first mixer stage. However, at low frequencies, low cost digitisers can do the same job directly in the baseband. Using fast signal processing, this method allows to continuously measure the radiated magnetic field around the equipment under test. Combined with position tracking, this allows to identify areas of maximum emissions very fast. These positions are then used to obtain a more detailed spectral analysis of emissions by increasing the measurement time over those spots. In result, the whole measurement procedure can be significantly optimized by spending less time over areas of lower interest, and putting more focus on areas of potentially high emission levels. This paper presents the concept as well as an experimental comparison of three antenna movement approaches satisfying the NRE01 and RE101 radiated emissions measurement procedures.
机译：为了测量设备周围的最大电磁辐射，许​​多测试方法都使用频域，传统上是使用超外差测试接收机。但是，对于大型的被测设备，当在低于150 kHz的低频下进行测量时，频域方法非常耗时，这需要较小的带宽，因此需要较长的测量时间。现在，时域测量正在取代传统的超外差接收器，但是商用时域接收器仍使用第一混频器级。但是，在低频下，低成本数字转换器可以直接在基带中完成相同的工作。通过快速信号处理，该方法可以连续测量被测设备周围的辐射磁场。结合位置跟踪，可以快速识别最大排放区域。然后，通过增加这些点的测量时间，将这些位置用于获得更详细的发射光谱分析。结果，可以通过在关注度较低的区域上花费更少的时间，并将更多的精力集中在潜在的高排放水平上来显着优化整个测量过程。本文介绍了满足NRE01和RE101辐射测量程序的三种天线移动方法的概念以及实验比较。

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