A Testbed for Evaluation of the Effects of Multipath on Performance of TOA-Based Indoor Geolocation
A Testbed for Evaluation of the Effects of Multipath on Performance of TOA-Based Indoor Geolocation
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DOI：
10.1109/tim.2013.2255976
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发表时间：
2013-04
影响因子：
5.6
通讯作者：
Jie He;K. Pahlavan;Shen Li-;Qin Wang
中科院分区：
文献类型：
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作者：
Jie He;K. Pahlavan;Shen Li-;Qin Wang
在多路径丰富的室内区域中基于到达时间（TOA）的地理定位系统的实时性能评估给研究界带来了严峻的挑战。这是由于这些系统在室内区域的不同多径条件下观察到的性能多种多样、定位算法的多样性和复杂性、设计对设备实现的敏感性以及在创建可控和可重复的多径条件时遇到的挑战。在本文中，我们提出了一种基于 TOA 的室内地理定位设备的实时性能评估系统，该系统使用实验室测试台中的仪器和测量在不同的多路径条件下运行。该测试台能够产生可重复的多路径条件。该测试台的核心是一个多通道实时无线电传播仿真器，能够同时仿真多达八个多径衰落通道。我们定义了美国马萨诸塞州伍斯特市伍斯特理工学院典型办公楼内发生的四种不同的多路径场景，展示了基于 TOA 的地理定位系统的各种预期性能。我们使用光线追踪软件来模拟这些场景引起的不同多径条件，并将多径条件映射到实时信道仿真器中以添加衰落效果。然后我们在这个实验室环境中测量典型商业产品的性能。为了证明该方法的有效性，我们将测试台中的测量结果与同一建筑物中实际测量获得的经验数据进行比较。
Real-time performance evaluation of time-of-arrival (TOA) based geolocation systems in multipath rich indoor areas has posed a serious challenge for the research community. This is due to the wide variety of performances observed with these systems under different multipath conditions in indoor areas, the diversity and complexity of the localization algorithms, sensitivity of the design to device implementation, and the challenges encountered in creating controllable and repeatable multipath conditions. In this paper, we present a real-time performance evaluation system for TOA-based indoor geolocation devices operating in different multipath conditions using instrumentation and measurements in a laboratory testbed. This testbed is capable of producing repeatable multipath conditions. The heart of this testbed is a multichannel real-time radio propagation emulator capable of emulating up to eight multipath fading channels simultaneously. We define four different multipath scenarios occurring in a typical office building at the Worcester Polytechnic Institute, Worcester, MA, USA, exhibiting a wide range of expected performance for the TOA-based geolocation systems. We use ray tracing software to simulate different multipath conditions caused by these scenarios and we map the multipath conditions into the real-time channel emulator to add the effects of fading. Then we measure the performance of a typical commercial product in this laboratory environment. To show the validity of this method, we compare the results of measurements in the testbed with empirical data obtained from actual measurements made in the same building.