Abstract:

Aiming at the problem that due to the influences of non line-of-sight (NLOS) propagation, the multipath effect and other factors, the location system is liable to low accuracy with large errors. A hybrid location algorithm for the acoustic source based on error correction (ECHL) and time difference of arrival (TDOA) is proposed. First, by correcting the weighted matrix of weighted least square (WLS) dynamically this algorithm can be used to obtain the initial value of Taylor series iteration, so as to achieve the purpose of reducing the number of times of iteration. Second, the influence of the time delay with larger errors on the positioning accuracy is eliminated by combining the algorithm for latter selection time delay with the standardized residual function. Then the optical positioning solution of TDOA integration is chosen. Finally, the target position is determined by the standardized residual weighting. Simulation results show that the proposed method can considerably outperform the single method, effectively restrain the NLOS error and improve the positioning accuracy compared with reference methods.

Key words: time difference of arrival, weighted least square, weight correction, Taylor series, latter selection of time delay, error correction