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http://dx.doi.org/10.9717/kmms.2022.25.2.280

Bluetooth Smart Ready implementation and RSSI Error Correction using Raspberry  

Lee, Sung Jin (Major of Smart Language IT Convergence, Busan University of Foreign Studies)
Moon, Sang Ho (Dept. of Computer Engineering, Busan University of Foreign Studies)
Publication Information
Abstract
In order to efficiently collect data, it is essential to locate the facilities and analyze the movement data. The current technology for location collection can collect data using a GPS sensor, but GPS has a strong straightness and low diffraction and reflectance, making it difficult for indoor positioning. In the case of indoor positioning, the location is determined by using wireless network technologies such as Wifi, but there is a problem with low accuracy as the error range reaches 20 to 30 m. In this paper, using BLE 4.2 built in Raspberry Pi, we implement Bluetooth Smart Ready. In detail, a beacon was produced for Advertise, and an experiment was conducted to support the serial port for data transmission/reception. In addition, advertise mode and connection mode were implemented at the same time, and a 3-count gradual algorithm and a quadrangular positioning algorithm were implemented for Bluetooth RSSI error correction. As a result of the experiment, the average error was improved compared to the first correction, and the error rate was also improved compared to before the correction, confirming that the error rate for position measurement was significantly improved.
Keywords
Bluetooth; RSSI; IoT; Error Correction; Raspberry;
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