An innovative positioning method based on linear frequency modulation for wireless sensor networks

In wireless sensor networks (WSN), location information is one of the critical issues for both performance and efficiency. This paper presents a new positioning method in WSN with reasonable implementation cost and excellent performance. Given a few reference nodes with known locations and node range estimates based on linear frequency modulation continuous wave (FMCW) technique, all nodes' location information can be derived by solving a set of circle equations. This technique is cost efficient, scalable and easy to be implemented. The simulation results show that the new method is fast convergent and precise.