The results of the man-made noise measurement campaign, organized by the Dutch society of radio amateurs, VERON, are compared with geographical data like the number of residential livings inside a circular area around the measurement location limited by a chosen distance. For each frequency band, correlation factors are derived as a function of the distance. It is shown that a strong correlation exists between the measured man-made noise floor and the density of habitation. This result proves that in this campaign, measured noise floor levels are mainly the result of accumulation of noise power from a large number of small sources spread in the houses, instead of being caused by a single, or a few, strong sources. The correlation is maximal at distances up to 200–300 m from the measurement location. Beyond that range, the correlation decreases, indicating that mainly sources in a range up to 300 m are relevant in determining the noise floor. This conclusion is supported by the observation that the slope of regression lines increasingly deviates from a theoretically derived slope at ranges over 300 m.

中文翻译：

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测量的人为噪声水平与居住密度之间的相关性

由荷兰业余无线电爱好者协会 VERON 组织的人造噪声测量活动的结果与地理数据进行了比较，例如受选定距离限制的测量位置周围圆形区域内的住宅数量。对于每个频带，相关因子被导出为距离的函数。结果表明，测得的人为底噪与居住密度之间存在很强的相关性。这一结果证明，在本次活动中，测得的本底噪声水平主要是散布在房屋内的大量小源的噪声功率累积的结果，而不是由单个或几个强源引起的。在距离测量位置 200-300 m 处相关性最大。超出该范围，相关性降低，表明主要在高达 300 m 范围内的源与确定本底噪声有关。这一结论得到了观察结果的支持，即回归线的斜率在超过 300 m 的范围内越来越偏离理论推导的斜率。