コントラクタフィルタ:有界不確かさと外れ値に対する集合論的状態推定
Contractor Filters
非線形連続時間システムの状態推定において、集合論的フィルタリングをコントラクタの合成として表現する新しいアーキテクチャを提案し、外れ値やモデル不整合下でのロバスト性を実証した。
詳しい要約
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著者: Simon Rohou
分類: cs.RO, math.DS
原文アブストラクト
We introduce Contractor Filters (CFs), a set-membership architecture for nonlinear continuous-time state estimation with bounded uncertainties and sporadic outliers. CFs represent feasible states symbolically by compositions of contractors rather than rematerializing a geometric enclosure after each update. This provides an abstraction layer between the set-theoretic filtering equations and their numerical realization, so prediction, correction, ambiguity, and outlier handling can be expressed within one algebra without prescribing a state geometry. We derive an exact nominal recursion and a guaranteed robust enclosure, with validated flow inclusions preserving soundness. Optional sub-paving compression then provides finite outer representations. CFs are evaluated against a robust particle filter on range-only and terrain-based localization under outliers, probabilistic model mismatch, association ambiguity, and multimodality. CFs retain the simulated truth in all tested configurations, while particle-filter reliability degrades under persistent bias and spatial aliasing. Contractor strength and compression budget control the trade-off between paving tightness and computational cost, while preserving the enclosure guarantee.