基于无线传感网络的停车场管理系统

This paper introduces a parking management system based on a wireless sensor network developed by our group. The system consists of a large amount of parking space monitoring nodes, a few parking guiding nodes, a sink node and a management station. All the nodes exchange information with each other through wireless communication. The prototype of the parking management system has been implemented and the preliminary test results show that the performance of the system can satisfy the requirements of the application.     

圆锥形卫星天线太阳光反射特性仿真

根据卫星探测的相关理论,建立了卫星光学探测的仿真模型,并利用MATLAB进行仿真,研究了任意给定的卫星轨道、卫星天线参数和地面探测站位置参数下,探测站观测到的卫星天线的星等值。引入了圆锥形卫星天线对太阳光的反射公式和星等值的概念,给出了卫星处于地球阴影区和探测站探测盲区的判断方法。通过对模拟结果进行分析,可以得出任意一天、任意时刻卫星天线对固定探测站的星等值,并能给出圆锥形卫星天线对地面固定探测站的星等值随时间的变化规律。结果表明对低地球轨道卫星,地面观测站的同一光学观测设备在一天时间内可观测时间是很短的,对于圆锥形卫星天线,可观测时间更短。