Abstract: In urban environment with serious blocking of direct paths,as a result of non-line-of-sight (NLOS) propagation effect, the accuracy of TOA estimation as well as the accuracy of location estimation is significant influenced. We developed a new algorithm to mitigate the NI_OS errors in location estimation based on multi-antenna system. Utilizing the TOAs obtained from different antennas in a multi-antenna array,the TOA with high accuracy is obtained by signal processing and integration. Simulation results show that this algorithm can mitigate NLOS errors effectively and improve the performance of TOA based location algorithm in NI_OS environment significantly.

Key words: Multi antenna,Location,TOA