講演抄録/キーワード |
講演名 |
2016-03-05 14:45
視覚障碍者歩行案内のためのBLEビーコン指向特性の改善 ○佐々木和志・中澤 匠(新潟大)・若月大輔・小林 真(筑波技大)・西森健太郎・牧野秀夫(新潟大) WIT2015-107 |
抄録 |
(和) |
屋内における歩行案内の精度向上を目的に,BLEビーコンを用いた測位手法及び指向特性の改善方法について検討した.基本的には,スマートフォンなどの受信端末で電界強度を計測し,ビーコンから受信端末までの距離を推定する.しかし,ビーコンから送信される電波は障害物による反射や散乱などの影響を大きく受けるため,それらが測位計測時の誤差要因となる.そこで,本報告ではBLEビーコンを使用する際の測位誤差減少を目的に,ビーコンのまわりに電波吸収材や反射材(アルミ)を用いて送信電波の指向特性改善を行う.実験では,電波暗室内と一般の建物(研究室)内で電波強度の計測を行った.その結果,反射材を用いた場合では,前後受信電力比率(FB比)が最大で約18.6dBとなった.また,吸収材と反射材を併用したビーコンを音声案内時の位置検出に応用した.その結果,吸収材を用いた場合,適合率が97.0%となり弁別能力が改善されることを確認した. |
(英) |
The present work examines directional applications of BLE beacons, and an indoor BLE beacon-based guidance system that holds the promise of truly accurate geographical positioning. At first, RSSI (Received Signal Strength Indication) is measured in smartphones, and the distance between the beacon and smartphone is estimated, based on its strength. Regarding signal strength, the degree of positioning error depends on the circumstances resulting from microwave reflection, or scattering. To eliminate this interference, we covered the BLE beacon with micro wave-absorbing and reflecting materials (carbon sponge and aluminum foil), to form a directional radio transmission pattern. In our experiments, we measured RSSI of the beacon from 8 distinct directions, both in a radio anechoic chamber and the laboratory. We determined that the Front-back ratio measured a maximum 18.6dB, when the beacon was covered by the aluminum foil. Moreover, we tested the speech-guidance function using two beacons. As a result, it was confirmed that beacons were easily distinguishable from one another, when they were positioned on corridor walls at 3m. intervals. |
キーワード |
(和) |
BLE / 電界強度 / 指向性 / 音声案内 / / / / |
(英) |
BLE / RSSI / Directivity / Speech guidance / / / / |
文献情報 |
信学技報, vol. 115, no. 491, WIT2015-107, pp. 107-112, 2016年3月. |
資料番号 |
WIT2015-107 |
発行日 |
2016-02-26 (WIT) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
WIT2015-107 |