ReRadar: Robust Radar Global Localization via Rotation-Equivariant Descriptor Learning

Abstract:Global localization with scanning millimeter-wave radar remains challenging because place-recognition descriptors often discard spatial structure needed for accurate pose retrieval. We present ReRadar, a radar global localization pipeline that extracts rotation-equivariant intermediate features using steerable convolutional neural networks, forms rotation-invariant descriptors through group pooling and NetVLAD aggregation, and combines descriptor retrieval with landmark-based matching to estimate the robot's three-degree-of-freedom (3-DoF) pose. Across fixed database-query evaluations, ReRadar with target-dataset adaptation achieves 99.37% Recall@1 on OORD Bellmouth, 91.44% Recall@1 with 80.99% F1_max on Mulran DCC01, and 99.38% Recall@1 on falling-snow Boreas sequence. Without target-dataset data, the cross-dataset model reaches 98.07% Recall@1 on OORD, performing comparably to the evaluated state-of-the-art methods.

9 pages, 8 figures. Under review

Robotics (cs.RO)

arXiv:2609.18092 [cs.RO]

(or arXiv:2609.18092v1 [cs.RO] for this version)

https://doi.org/10.48550/arXiv.2609.18092 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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