碩士 / 國立中正大學 / 雲端計算與物聯網數位學習碩士在職專班 / 106 / In the modern world, a common situation is you have lost something (a key or any person-al object); however, you have a smart phone with you. The lost object is also often Blue-tooth-enabled, which we call a Bluetooth device. The target problem resolved in this Thesis is how to navigate and thus locate a Bluetooth device using a single smart phone. This problem is different from indoor and outdoor locating because indoor locating requires 3 or more installed sensors and outdoor locating requires GPS, while the target problem in this Thesis is to use a single smart phone for locating.
This Thesis proposes a navigation-based locating method using a smart phone to guide us-ers to find lost Bluetooth devices. A key technique employed in this method is to monitor the changes in the strength of the Received Signal Strength Indicator (RSSI) of Bluetooth Low En-ergy (BLE) due to human body blockage during an in-situ rotation. A relatively low RSSI indi-cates the device is located behind the user’s body which is currently blocking the signal from the device. After a full rotation, we can thus determine how the target Bluetooth device is relatively located to the smartphone. Once a direction is determined the user is guided to move towards the object. If the user has moved beyond the target device (which he/she did not see while moving), then our method also warns the user. Thus, a user is guided towards the lost target object throughout from the current location of the user to the final location of the object. The proposed method does not require the establishment of an environmental database in advance, and can work normally in the case of multiple interference sources in different environments. Accord-ing to experimental results, the proposed method can correctly guide the user to find the target Bluetooth device. The average system recommendation accuracy rate is 62.42% within one turn. The probability of finding the device within 4 turns is 88.37%, and the success rate of finding the lost device is 100%, that is, all lost devices can be found eventually.
| Identifer | oai:union.ndltd.org:TW/105CCU01496010 |
| Date | January 2018 |
| Creators | HUANG, TIEN-WEI, 黃添威 |
| Contributors | HSIUNG, PAO-ANN, 熊博安 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 38 |
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