Analysis of the variability of RSSI values for active RFID-based indoor applications
Analysis of the variability of RSSI values for active RFID-based indoor applications
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基于有源 RFID 的室内应用的 RSSI 值变化分析
DOI：
10.3906/muh-1208-3
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发表时间：
2013
影响因子：
2.6
通讯作者：
LI Nan
中科院分区：
文献类型：
--
作者：
G. Calis;B. Becerik;A. B. Göktepe;LI Shuai;LI Nan
基于射频识别(RFID)技术的室内定位解决方案已经被许多行业广泛采用。影响RFID应用性能的一个重要因素是接收信号强度指示(RSSI)值。室内设置和布局可能会直接影响RSSI的可变性，进而影响RFID应用结果的稳健性。在以前的文献中已经观察和报道了不同环境因素对RFID标签的RSSI值的影响，然而，缺乏以整体和量化的方式解决这些参数对RSSI值的影响的研究。在这项研究中，使用两个不同的测试场景来比较和评估室内应用中有源RFID标签的RSSI值与系统参数之间的关系。这些参数包括：1)标签所附材料的类型，2)标签和天线之间的障碍物，3)标签和天线之间的相对高度，以及4)标签和天线的相对方位。通过统计分析评价各参数的影响。进行了Shapiro-Wilk、Bartlett‘s、Levene’s、Kruskal-Wallis、Mann-Whitney和Games-Howell测试。结果表明，所有系统参数测试的数据组都是非正态分布的、异质的。根据Mann-Whitney试验结果，对于所有系统参数，用于比较两个试验台中的RSSI值的U值为0.00。结果表明，不同的系统参数会导致RSSI值和检测率的不同。然而，不同的试验台改变了各个参数对RSSI值的影响。结论是，测试环境是影响结果和RSSI值波动的一个显著参数，检测率不能归因于本研究中包含的任何特定参数。
Radio frequency identification (RFID) technology-based indoor localisation solutions have been widely adapted by many industries. An important factor affecting the performance of RFID applications is the received signal strength indication (RSSI) values. Indoor setting and layout may have direct effects on the RSSI variability, which, in turn, affect the robustness of RFID applications’ outcomes. Effects of different environmental factors on RSSI values for RFID tags have been observed and reported in previous literature; however, there is a lack of research that addresses the effects of such parameters on RSSI values in a holistic and quantified manner. In this study, 2 different test scenarios are used to compare and assess the relationships between the RSSI values and system parameters for active RFID tags in indoor applications. These parameters include: 1) type of materials that tags are attached to, 2) obstructions between tags and an antenna, 3) relative elevation between tags and an antenna, and 4) relative orientation of tags and an antenna. The effect of each parameter was evaluated by statistical analyses. The Shapiro–Wilk, Bartlett’s, Levene’s, Kruskal–Wallis, Mann–Whitney, and Games–Howell tests were conducted. The results show that the data groups for all of the system parameter tests were nonnormally distributed and heterogeneous. Based on the Mann–Whitney test results, U values for comparisons of RSSI values in both test beds were found to be 0.00 for all of the system parameters. The results indicate that different system parameters caused variations in RSSI values as well as the detectability rates. Nevertheless, different test beds changed the influence of each parameter on the RSSI values. It is concluded that testing environment is a prominent parameter that affects the results and fluctuations in the RSSI values, and that the detectability rates cannot be attributed to any specific parameter that has been included in this study.