Tightly Coupled SLAM with Imprecise Architectural Plans

TL;DR

This paper introduces a SLAM algorithm that effectively uses architectural plans for indoor robot navigation, accounting for real-world deviations to improve localization accuracy in both simulated and real environments.

Contribution

The novel algorithm tightly couples LIDAR-based SLAM with architectural plans, estimating structural deviations in real-time to enhance localization robustness.

Findings

Achieves 43% less localization error in simulations

Demonstrates 7% lower alignment error in real environments

Robust to deviations up to 35 cm and 15 degrees

Abstract

Robots navigating indoor environments often have access to architectural plans, which can serve as prior knowledge to enhance their localization and mapping capabilities. While some SLAM algorithms leverage these plans for global localization in real-world environments, they typically overlook a critical challenge: the "as-planned" architectural designs frequently deviate from the "as-built" real-world environments. To address this gap, we present a novel algorithm that tightly couples LIDAR-based simultaneous localization and mapping with architectural plans under the presence of deviations. Our method utilizes a multi-layered semantic representation to not only localize the robot, but also to estimate global alignment and structural deviations between "as-planned" and as-built environments in real-time. To validate our approach, we performed experiments in simulated and real datasets demonstrating robustness to structural deviations up to 35 cm and 15 degrees. On average, our method achieves 43% less localization error than baselines in simulated environments, while in real environments, the as-built 3D maps show 7% lower average alignment error