Wireless positioning method based on dynamic objective function under mixed LOS/NLOS conditions

摘要

The current wireless positioning technology faces with the influence of the mixed line of sight(LOS) and nonLOS(NLOS) environment. The measurement error will become larger under NLOS environment and then result in a significant reduction of accuracy and instability of positioning results. Therefore, the research of wireless location under the LOS/NLOS environment has become research hotspots. In this paper, a dynamic positioning method based on the received signal strength(RSS) is proposed to solve this current hot issue. This method firstly adopts mixed Gauss model to describe the LOS and NLOS propagation effects, respectively, which can avoid the LOS/NLOS identifying problem. At the same time, the simulated annealing (SA) algorithm is exploited to overcome the local optimal solution problem. Simulation results show that our method can achieve good positioning performance under mixed LOS/NLOS environment.