限定空间无线电监控系统的设计

The Design of the Space-Limitation Wireless Monitoring System

为实现监控中心对多个移动目标活动范围的监控,本文分析了超高频频段电波传播的特点及传播损耗估算的一般方式。提出用取样机设置限定空间;用取样转发、50Hz磁感应切换、辅助寻呼措施解决电波场强过于悬殊的问题;以渐进方式设计具有“防卸”、预警、报警功能的应答式监控系统。并提出在使用灵活性要求不高的前提下,利用现有的移动定位系统来设计本监控系统的要点。

In order for the Monitoring Center to achieve the result of successful monitoring of the range of activity of several moving objects, this paper analyzes the features of the electric wave transmission of UHF and the ways used to measure the wave loss during transmission, and puts forwards the idea of using the sample-obtaining machine to limit space and using the samples to transmit, the 50Hz magnetic induction to switch, and the function of assistant calling so that the problem of the large gap between the strong and weak electric waves could be solved. On the other hand, the paper also discusses the design of a responsive monitoring system that has the functions of 'recovering', pre-warning, and alarming, and proposes that with limited requirements the present locating system of moving objects can be used to design the above-mentioned monitoring system.