Outdoor localization of a WiFi source with unknown transmission power
Outdoor localization of a WiFi source with unknown transmission power
复制标题
传输功率未知的 WiFi 源的室外定位
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
A. Dempster
中科院分区：
文献类型：
--
作者：
Ryan J. R. Thompson;A. T. Balaei;A. Dempster
对全球导航卫星系统可靠性的一个威胁是射频干扰。定位干扰源的一种可能性是进行接收信号强度（RSS）测量。为了探索这种情况下的传感器网络创建在一个140平方米的室外环境中使用的Wi-Fi站，可以测量接收到的信号强度的Wi-Fi接入点的数量。对数正态路径损耗模型用于将RSS值与距离相关联。虽然通过勘测创建环境的无线电地图的方法给出良好的性能，但是对于大型室外环境在所有位置进行这样的勘测可能是不实际的。作为替代方案，传播环境的路径损耗指数可以与位置和发射功率一起沿着估计。这在传播环境表现更好的室外环境中更有意义。的本地化性能进行了比较与理论性能给出的克拉美-罗下限。该想法的直接应用包括未知Wi-Fi移动的站或Wi-Fi接入点的被动定位，该未知Wi-Fi移动站或Wi-Fi接入点无意中降低了在ISM频带中操作的定位系统（诸如Locata）的性能。在140 m2的试验区域内，
One threat to the reliability of GNSS systems is RF interference. One possibility for localising interference sources is to take received signal strength (RSS) measurements. To explore this scenario a sensor network is created in a 140m 2 outdoor environment using a number of Wi-Fi stations that can measure the received signal strength of a Wi-Fi access point. The log-normal path-loss model is used to relate the RSS value to distance. Although methods that create a radio-map of an environment through a survey give good performance it may not be practical to conduct such a survey in all locations for a large outdoor environment. As an alternative the path-loss exponent of the propagation environment can be estimated along with position and transmission power. This makes more sense in an outdoor environment where the propagation environment is better behaved. The localisation performance is compared with the theoretical performance given by the Cramer-Rao lower bound. Immediate applications of this idea include the passive localisation of an unknown Wi-Fi mobile station or a Wi-Fi access point that is unintentionally degrading the performance of a positioning system that operates in the ISM band such as Locata. In the 140m 2 area where the experiment took place the root-mean-square position