Three-dimensional indoor positioning based on wireless mobile communication network

Three-dimensional indoor positioning is a hot topic in communication network. Chan algorithm is widely used in two-dimensional domain, and gives original to an extended algorithm for three-dimensional positioning. However, the accuracy of the extended algorithm drops significantly when it's under non line of sight (NLOS) propagation. In this paper, we present a new algorithm based on the original Chan algorithm, improved 3-dimensional Chan algorithm, which introduces an attenuation factor to smooth the impact of NLOS error and a global computing-local correction algorithm to position Z axis coordinate. As the experimental results show, our algorithm exhibits superior accuracy-the root mean square error (RMSE) is reduced by about 93.12% compared to the present three-dimensional Chan algorithms.