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Documents 基于无线网络的定位系统的设计与实现
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  • Author Author: sophie0love
  • Date Created: 23 Nov 2010 2:57 PM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:52 PM
  • Views 361 views
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基于无线网络的定位系统的设计与实现

无线定位是指利用无线通信资源,通过测量信号的各种参数,借助一定的定位算法,确定被测目标在某一坐标系中的位置。无线定位分为卫星无线定位和地面无线定位。其中地面无线定位又分为基于公共移动通信系统的定位系统,基于传感器的专用定位系统和基于无线网络的定位系统。 本文根据无线定位系统的原理设计并实现了一个基于无线网络的定位系统,采用了距离相关的定位方法。该系统不依赖于GPS卫星,CDMA,GSM基站等,其能够有效的完成监狱及劳教等场所室内及室外的定位。具体完成的工作有: (1)介绍了无线定位的原理,技术,分类和无线定位的实现方法等。 (2)利用射频收发芯片CC2500的WOR特性和所选取的MSP430F2274单片机的LPM4和LPM3特性设计实现了系统的通信协议,系统同步以及被测目标的低功耗。 (3)在相邻区域中采用了频分复用,同一区域内采用时分复用,以及基于射频收发芯片CC2500的TX-if-CCA特性实现的载波检测共同完成系统的抗冲突及防碰撞。 (4)室外采用了基于射频信号RSSI的定位;室内采用了基于超声波信号的TOA定位,同时在超声波信号发送前先发送射频参考信号完成一些数据信息的发送及TOA基准时间的确定;在狭小空间采用了接近式定位。所有定位均采用射频信号完成同步。 (5)使用该系统进行了定位试验:在单个被测目标静止的理想情况下,8m*8m的室内误差在0.3m至0.8m之间;20m*20m的室外误差在0.4m至1.1m之间。在多被测目标的运动情况下,会出现结果错误及被测目标遗漏的情况,但同一被测目标没有出现在连续的两次测试中均遗漏的情况。

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