Unified Error Analysis of Multi-site Radar via Equivalent Angular Resolution
Abstract
High-precision indoor sensing using monostatic multiple-input multiple-output (MIMO) radar typically relies on increasing the physical aperture size of antennas, leading to high hardware complexity and cost. To overcome this bottleneck, this paper establishes a unified framework for multi-site radar sensing based on equivalent angular resolution, together with a design methodology that uses this metric to optimize distributed Single-Input Single-Output (SISO) configurations. By mapping spatial diversity into the angular domain, the proposed metric enables a direct and physically interpretable comparison with monostatic MIMO beamwidth. The associated methodology provides a principled way to select node placement and geometry to synthesize an effective virtual aperture that suppresses angular glint and multipath. Experiments with commercial 60-GHz radars in cluttered indoor environments validate the superiority of the multi-site SISO configuration over monostatic MIMO, demonstrating a reduction in maximum localization error from 0.58 m to 0.20 m and mean error from 0.35 m to 0.12 m.
Cite
@article{arxiv.2604.16014,
title = {Unified Error Analysis of Multi-site Radar via Equivalent Angular Resolution},
author = {Lang Qin and Zelin Liu and Rongjie Li and Zhiqiang Huang and Xiaoguang Liu},
journal= {arXiv preprint arXiv:2604.16014},
year = {2026}
}