| Presentation | 2016-03-05 BLE beacons' directional application improvement to guidance systems for the visually impaired Kazushi Sasaki, Takumi Nakazawa, Daisuke Wakatsuki, Makoto Kobayashi, Kentaro Nishimori, Hideo Makino, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | 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. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | BLE / RSSI / Directivity / Speech guidance |
| Paper # | WIT2015-107 |
| Date of Issue | 2016-02-26 (WIT) |
| Conference Information | |
| Committee | WIT |
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| Conference Date | 2016/3/4(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tusukuba Univ. of Tech.(Tsukuba) |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Hearing / Visually impaired person support technology, etc. |
| Chair | Kiyohiko Nunokawa(Tokyo International Univ.) |
| Vice Chair | Chikamune Wada(Kyushu Inst. of Tech.) |
| Secretary | Chikamune Wada(Nagoya Inst. of Tech.) |
| Assistant | Tomohiro Amemiya(NTT) / Takeaki Shionome(Tsukuba Univ. of Tech.) / Manabi Miyagi(Tsukuba Univ. of Tech.) |
| Paper Information | |
| Registration To | Technical Committee on Well-being Information Technology |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | BLE beacons' directional application improvement to guidance systems for the visually impaired |
| Sub Title (in English) | |
| Keyword(1) | BLE |
| Keyword(2) | RSSI |
| Keyword(3) | Directivity |
| Keyword(4) | Speech guidance |
| 1st Author's Name | Kazushi Sasaki |
| 1st Author's Affiliation | Niigata University(Niigata Univ.) |
| 2nd Author's Name | Takumi Nakazawa |
| 2nd Author's Affiliation | Niigata University(Niigata Univ.) |
| 3rd Author's Name | Daisuke Wakatsuki |
| 3rd Author's Affiliation | Tsukuba University of Technology(Tsukuba Univ. of Tech.) |
| 4th Author's Name | Makoto Kobayashi |
| 4th Author's Affiliation | Tsukuba University of Technology(Tsukuba Univ. of Tech.) |
| 5th Author's Name | Kentaro Nishimori |
| 5th Author's Affiliation | Niigata University(Niigata Univ.) |
| 6th Author's Name | Hideo Makino |
| 6th Author's Affiliation | Niigata University(Niigata Univ.) |
| Date | 2016-03-05 |
| Paper # | WIT2015-107 |
| Volume (vol) | vol.115 |
| Number (no) | WIT-491 |
| Page | pp.pp.107-112(WIT), |
| #Pages | 6 |
| Date of Issue | 2016-02-26 (WIT) |