https://ieeexplore.ieee.org/iel7/6287639/6514899/08520860.pdf
H Ye, W Yang, Y Yao, T Gu, Z Huang - IEEE Access, 2018
This paper presents the design and implementation of BTrack, a new approach for location tracking on mountain roads. It is as accurate as the GPS on common smartphones, but costs much less energy. To design such a location system, we …