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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks
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An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

机译：一种在IEEE 802.11和802.15.4无线网络上仅基于RSSI的免校准实时室内本地化的改进方法

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摘要

Assuming a reliable and responsive spatial contextualization service is a must-have in IEEE 802.11 and 802.15.4 wireless networks, a suitable approach consists of the implementation of localization capabilities, as an additional application layer to the communication protocol stack. Considering the applicative scenario where satellite-based positioning applications are denied, such as indoor environments, and excluding data packet arrivals time measurements due to lack of time resolution, received signal strength indicator (RSSI) measurements, obtained according to IEEE 802.11 and 802.15.4 data access technologies, are the unique data sources suitable for indoor geo-referencing using COTS devices. In the existing literature, many RSSI based localization systems are introduced and experimentally validated, nevertheless they require periodic calibrations and significant information fusion from different sensors that dramatically decrease overall systems reliability and their effective availability. This motivates the work presented in this paper, which introduces an approach for an RSSI-based calibration-free and real-time indoor localization. While switched-beam array-based hardware (compliant with IEEE 802.15.4 router functionality) has already been presented by the author, the focus of this paper is the creation of an algorithmic layer for use with the pre-existing hardware capable to enable full localization and data contextualization over a standard 802.15.4 wireless sensor network using only RSSI information without the need of lengthy offline calibration phase. System validation reports the localization results in a typical indoor site, where the system has shown high accuracy, leading to a sub-metrical overall mean error and an almost 100% site coverage within 1 m localization error.
机译：假设可靠和响应性的空间上下文服务是IEEE 802.11和802.15.4无线网络中必不可少的，一种合适的方法包括实现本地化功能，作为通信协议堆栈的附加应用层。考虑到诸如室内环境之类的基于卫星的定位应用被拒绝的应用场景，并且不考虑由于缺乏时间分辨率而导致的数据包到达时间测量，根据IEEE 802.11和802.15.4获得的接收信号强度指示器（RSSI）测量数据访问技术是适合使用COTS设备进行室内地理参考的独特数据源。在现有文献中，引入了许多基于RSSI的本地化系统并进行了实验验证，但是它们需要定期校准以及来自不同传感器的大量信息融合，从而大大降低了整体系统的可靠性及其有效可用性。这激励了本文中提出的工作，该工作介绍了一种基于RSSI的免校准实时室内定位方法。尽管作者已经介绍了基于交换光束阵列的硬件（符合IEEE 802.15.4路由器功能），但本文的重点是创建算法层，以与能够实现完整功能的现有硬件一起使用。在仅使用RSSI信息的标准802.15.4无线传感器网络上进行本地化和数据上下文化，而无需漫长的离线校准阶段。系统验证报告了典型室内场所的定位结果，该系统显示出很高的准确性，导致亚度量的总体平均误差以及1 m定位误差内几乎100％的站点覆盖率。

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