Improved positioning algorithm based on two step least square in NLOS environments

Non-line-of-sight(NLOS)propagation is a major source of error for accurate time-of-arrival(TOA)location estimation.The two-step least square(LS)method,which does not need any information about the distribution of the NLOS error,has been studied in related researches to provide efficient location estimation of the mobile terminal(MT).By observing the estimation of the error covariance matrix in the two-step LS method,this paper finds that the measured distances are more suitable than the initial estimated di...