Subspace Fitting Approach for Wideband Near-Field Localization
Signal Processing
2025-08-07 v1
Abstract
Two subspace fitting approaches are proposed for wideband near-field localization. Unlike in conventional far-field systems, where distance and angle can be estimated separately, spherical wave propagation in near-field systems couples these parameters. We therefore derive a frequency-domain near-field signal model for multi-target wideband systems and develop a subspace fitting-based MUSIC method that jointly estimates distance and angle. To reduce complexity, a Fresnel approximation MUSIC algorithm is further introduced to decouple the distance and angle parameters. Numerical results verify the effectiveness of both proposed approaches.
Keywords
Cite
@article{arxiv.2508.04169,
title = {Subspace Fitting Approach for Wideband Near-Field Localization},
author = {Ruiyun Zhang and Zhaolin Wang and Zhiqing Wei and Yuanwei Liu and Zehui Xiong and Zhiyong Feng},
journal= {arXiv preprint arXiv:2508.04169},
year = {2025}
}