Intelligent Reflecting Surface-Aided Maneuvering Target Sensing: True Velocity Estimation

TL;DR

This paper proposes a novel IRS-assisted method for accurately estimating the true velocity of maneuvering targets in vehicular networks, overcoming limitations of traditional mono-static ISAC systems.

Contribution

It introduces a two-stage velocity estimation scheme leveraging both BS and IRS perspectives, significantly improving true velocity recovery accuracy.

Findings

True velocity can be precisely recovered using the proposed scheme

Adding IRS enhances velocity estimation accuracy

Experimental results validate the effectiveness of the approach

Abstract

Maneuvering target sensing will be an important service of future vehicular networks, where precise velocity estimation is one of the core tasks. To this end, the recently proposed integrated sensing and communications (ISAC) provides a promising platform for achieving accurate velocity estimation. However, with one mono-static ISAC base station (BS), only the radial projection of the true velocity can be estimated, which causes serious estimation error. In this paper, we investigate the estimation of the true velocity of a maneuvering target with the assistance of an intelligent reflecting surface (IRS). We propose an efficient velocity estimation algorithm by exploiting the two perspectives from the BS and IRS to the target. We propose a two-stage scheme where the true velocity can be recovered based on the Doppler frequency of the BS-target link and BS-IRS-target link. Experimental results validate that the true velocity can be precisely recovered and demonstrate the advantage of adding the IRS.