Is FM a RF-Based Positioning Solution in a Metropolitan-Scale Environment? A Probabilistic Approach With Radio Measurements Analysis
Is FM a RF-Based Positioning Solution in a Metropolitan-Scale Environment? A Probabilistic Approach With Radio Measurements Analysis
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DOI：
10.1109/tbc.2009.2025456
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发表时间：
2009-09-01
影响因子：
4.5
通讯作者：
Lin, Tsung-Nan
中科院分区：
文献类型：
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作者：
Fang, Shih-Hau;Chen, Jen-Chian;Lin, Tsung-Nan
最近的移动的设备由于设备制造的持续改进而已经包含低成本FM接收功能。本文表明，基于FM信号的定位是一种替代的无线电选择，同时满足FCC的要求。我们提出了一个概率定位系统，使用更广泛的覆盖和更长的寿命FM基础设施。本研究在两个不同的大都市规模环境下，包括台湾大学（NTU）和文山农村地区的性能进行评估。两个结果都表明，基于FM的定位系统不仅满足FCC的要求，而且提供了一个相当的，甚至更好的性能，基于GSM的解决方案。此外，我们从时间变化、空间分离、测量相关性和频谱分配四个方面全面分析了FM和GSM的实际无线电测量。观察到大多数FM测量提供比GSM更低的时间变化但更弱的空间分离。幸运的是，我们发现空间分离的缺乏可以通过添加额外的感测通道来补偿。该特性对于可用GSM基站有限且距离较远的农村地区尤其有用。进一步指出，当信号电平小于-90 dBm时，GSM信号的空间分离度下降。在这样的条件下，FM报告比GSM更好的准确性，即使具有更少的信道。
Recent mobile devices have already contained a low-cost FM receiving function due to the continuing improvements in the device manufacturing. This paper shows that positioning based on FM signal is an alternative radio option while meeting the FCC requirement. We present a probabilistic location system using a wider-covered and longer-lived FM infrastructure. The performance is evaluated in two different metropolitan-scale environments including National Taiwan University (NTU) and Wen-Shan rural area. Both results show that the FM based location system not only satisfies the FCC requirement but also provides a comparable or even better performance to GSM based solution. Moreover, we completely analyze the realistic radio measurements of FM and GSM from four perspectives including temporal variation, spatial separation, measurement correlation and spectrum allocation. Most FM measurements are observed to provide a lower temporal variation but a weaker spatial separation than GSM. Fortunately, we discover that the lack of spatial separation can be compensated by adding additional sensed channels. This property is useful especially for a rural area where the available GSM base stations are limited and distant. Furthermore, we point out that the spatial separation of GSM signal decreases when the signal level is weaker than -90 dBm. At such a condition, FM reports a better accuracy than GSM even with the fewer channels.