Outdoor fingerprint localization with BLE beacons

<strong>Introduction</strong> The data set contains received signal strength (RSS) measurements made with Bluetooth Low Energy (BLE) technology, which can be used for outdoor fingerprint-based localization applications, as presented in an article "LOG-a-TEC Testbed Outdoor Localization Usign BLE Beacons". <strong>Measurement setup</strong> The measurements were created with WL1837MOD radio connected to a in-house embedded device. The data set was collected with 40 nodes of the LOG-a-TEC testbed positioned at the campus of the Jožef Stefan Institute, Ljubljana. The experimentation area is composed of 5 x 26 positions separated by 1.2 m covering 150 square meters. On each position a mobile phone was broadcasting BLE advertising beacons with power of -2 dBm in interval of 100 ms. Surrounding testbed nodes were collecting the beacons for approximately a minute for each position. <strong>Data set</strong> Measurements are stored in JSON format where each object contains rss measurement (in dBm) with corresponding timestamp (in seconds). The folder contains two JSON files: spring_data.json - measurements made in May 2022, winter_data.json - smaller measurements made in December 2021. This data set contains only the measurements from the middle row of the campus park.

引言
本数据集包含基于蓝牙低功耗（Bluetooth Low Energy, BLE）技术采集的接收信号强度（Received Signal Strength, RSS）测量数据，可应用于基于指纹的室外定位场景，相关研究成果发表于论文《LOG-a-TEC测试平台基于BLE信标的室外定位》（LOG-a-TEC Testbed Outdoor Localization Usign BLE Beacons）。

测量方案
本次测量采用连接至自研嵌入式设备的WL1837MOD射频模块完成。本数据集由部署于斯洛文尼亚卢布尔雅那约瑟夫·斯特凡研究所园区内的LOG-a-TEC测试平台的40个节点采集得到。实验区域共设置5×26个采样点，相邻采样点间距1.2米，总覆盖面积达150平方米。每个采样点处均部署一台移动终端，以-2 dBm的发射功率每隔100毫秒广播BLE广告信标。周边测试平台节点会对每个采样点的信标进行约1分钟的数据采集。

数据集说明
测量数据以JSON格式存储，每个数据对象包含以dBm为单位的RSS测量值与对应的秒级时间戳。该数据集文件夹包含两个JSON文件：spring_data.json为2022年5月采集的测量数据，winter_data.json为2021年12月采集的小规模测量数据。本数据集仅包含园区草坪中间一行的采样测量数据。