An Accurate Direction Finding Scheme Using Virtual Antenna Array via Smartphones
School of Computer Science and Technology, University of Science and Technology of China, Hefei 230000, China
Author to whom correspondence should be addressed.
Academic Editor: Yu Wang
Received: 25 August 2016 / Revised: 23 October 2016 / Accepted: 25 October 2016 / Published: 29 October 2016
With the development of localization technologies, researchers solve the indoor localization problems using diverse methods and equipment. Most localization techniques require either specialized devices or fingerprints, which are inconvenient for daily use. Therefore, we propose and implement an accurate, efficient and lightweight system for indoor direction finding using common smartphones and loudspeakers. Our method is derived from a key insight: By moving a smartphone in regular patterns, we can effectively emulate the sensitivity and functionality of a Uniform Antenna Array to estimate the angle of arrival of the target signal. Specifically, a user only needs to hold his smartphone still in front of him, and then rotate his body around
duration with the smartphone at an approximate constant velocity. Then, our system can provide accurate directional guidance and lead the user to their destinations (normal loudspeakers we preset in the indoor environment transmitting high frequency acoustic signals) after a few measurements. Major challenges in implementing our system are not only imitating a virtual antenna array by ordinary smartphones but also overcoming the detection difficulties caused by the complex indoor environment. In addition, we leverage the gyroscope of the smartphone to reduce the impact of a user’s motion pattern change to the accuracy of our system. In order to get rid of the multipath effect, we leverage multiple signal classification to calculate the direction of the target signal, and then design and deploy our system in various indoor scenes. Extensive comparative experiments show that our system is reliable under various circumstances.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
Scifeed alert for new publications
Never miss any articles
matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
Define your Scifeed now
Share & Cite This Article
MDPI and ACS Style
Wang, X.; Xiong, Y.; Huang, W. An Accurate Direction Finding Scheme Using Virtual Antenna Array via Smartphones. Sensors 2016, 16, 1811.
Wang X, Xiong Y, Huang W. An Accurate Direction Finding Scheme Using Virtual Antenna Array via Smartphones. Sensors. 2016; 16(11):1811.
Wang, Xiaopu; Xiong, Yan; Huang, Wenchao. 2016. "An Accurate Direction Finding Scheme Using Virtual Antenna Array via Smartphones." Sensors 16, no. 11: 1811.
Show more citation formats
Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
[Return to top]
For more information on the journal statistics, click here
Multiple requests from the same IP address are counted as one view.