摘要
Abstract
In the event of a ifre, explosion, chemical leakage and other safety accidents, the emergency communication crew need to provide timely communication for on-site rescue, and to ensure personal safety of ifeld technicians at the same time, the crew are required to do so from a distance. This article compared the demand of safety distance in special disaster scenes with the technical performance of existing vehicle-borne emergency communication system, and analyzed the methods and feasibility of realizing effective coverage over a distance in theory. Countermeasures were made, and ifeld simulation experiments were conducted. It was veriifed by ifeld tests that the effective coverage over a distance can be improved through several methods, such as replacing the antenna feeding system, reforming the base station radio frequency unit, adjusting wireless parameters, increasing signal strength and antenna gain, etc. Thus long distance coverage of vehicle-borne CDMA communication systems in special situations has been achieved.关键词
CDMA通信/应急通信/远距离定向覆盖Key words
CDMA communication emergency/communication directional/coverage over a long distance分类
信息技术与安全科学
