A Two-step TOA Estimation Algorithm Based on TR Technology in Complex Environment

Abstract

In a complex environment, because of the multipath effect, the ultra-wideband (UWB) signal will arrive at the receiving end by multiple propagation paths rather than a propagation path, and the multipath effect will bring the error to the accurate estimation of TOA. To accurately estimate the TOA value is actually to find the arrival time estimation of the direct path (DP). In this paper, a two-step TOA estimation algorithm based on time reversal (TR) is proposed in the complex environment. Compared with the traditional algorithm, the time reversal technique is no longer a method of restraining multipath effect in complex environment, but making full use of each multipath component so that it can significantly compress the multipath delay spread. The experimental results show that the two-step estimation algorithm based on time reversal can effectively reduce the impact of multipath delay on TOA estimation under complex environment and greatly reduce the amount of data operations, thus improving the TOA estimation accuracy in complex environment.