Estimation of no-line-of-sight sound source using ratio of peak and root mean square values of cross correlation function

Abstract

Estimation of no-line-of-sight (NLOS) condition is a key technology for practical indoor localization. In this paper, a novel method to estimate the NLOS sound source using ratio of peak and root mean square values of cross correlation function is proposed. The proposed method is evalueted with experiment in a room and compared with previously proposed method using assumption of Rice distribution. The estimated result of NLOS of the previous method do not show a monotonic increasing with degree of the NLOS, because of the existance of non-deniable reflective waves. On the other hand, the proposed method is possible to estimate the value which show monotonic increase with degree of NLOS. The proposed method may contribute to robust estimation of NLOS condition for indoor localization and robustness of the localization itself.