针对雷达处在电梯井条件下遇到多径抑制问题、杂波抑制问题等,结合处于电梯井下时雷达系统所具有的杂波特性,采用射线追踪法来对井道内部的电磁波信号的传播特性进行分析,结果表明,在电梯井道的内部有很严重的多径衰落出现,在各轿厢停靠处多径衰落出现明显改变。多径在井道内从转发器处正式收发雷达的信号,随着电磁波频率与其空间位置变化而变化。电梯井杂波源自于井道壁中回波,依据是雷达会在电梯往井下运动的具体运动过程当中呈现静态背景杂波,这对于电梯运用而言是一项关键问题,工程师们为了解决这个问题采用了基于散射相似性的方法,这种方法既是一种科学性的方法,也是一种抑制性的方法。

In this paper, aiming at the problem of multipath suppression and clutter suppression in the elevator shaft, combined with the clutter characteristics of the radar system in the elevator shaft, the suspected tracking method is used to analyze the propagation characteristics of the electromagnetic wave signal in the shaft. The results show that there is a serious multipath fading in the elevator shaft, at each car stop, the multipath fading changes obviously. Multipath radar signals are transmitted and received formally from the transponder in the shaft, which changes with the change of electromagnetic wave frequency and its spatial position. The clutter of elevator shaft comes from the echo of shaft wall. According to the key problem of static background clutter in the process of elevator shaft, a scientific suppression method based on scattering similarity is proposed.

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国家质检总局科技计划项目“基于Android 系统的电梯安全检验智能平台的研发”(2013QK101)