Pseudorange error analysis for precise indoor positioning system

Marek Pola – Pavel Bezoušek

   There is a currently developed system of a transmitter indoor localization intended for fire fighters or members of rescue corps. In this system the transmitter of an UWB OFDM signal position is determined by the TDOA method. The position measurement accuracy highly depends on the direct-path signal time of arrival estimation accuracy which is degraded by severe multipath in complicated environments such as buildings. The aim of this article is to assess errors in the direct-path signal time of arrival determination caused by multipath signal propagation and noise. Two methods of the direct-path signal time of arrival estimation are compared here: the cross correlation method and the spectral estimation method.

Keywords: UWB, TDOA, OFDM, CRB, CCF

[full-paper]