提出一种无需旋转的多磁力计定位校准方法,提升机器人在复杂环境中的定位精度。
RoSLAC: Robust Simultaneous Localization and Calibration of Multiple Magnetometers

- 通过交替优化同时估计机器人位姿与磁力计校准参数
- 实测与仿真验证定位误差低于10厘米,计算开销低
- 适合重载平台或动态障碍多的室内场景使用
在办公室、酒店、医院、室内停车场及地下空间等封闭或半封闭环境中,自主移动机器人(AMR)的定位因缺乏GPS信号而面临挑战。基于外部基础设施(如QR码、RFID)的方法成本高且灵活性差;基于激光雷达或视觉的方案则受动态障碍物遮挡和几何特征模糊影响。基于环境磁场(AMF)的定位近年来受到关注,因其不依赖外部设施或几何特征,适用于服务机器人与安防机器人。但磁力计测量易受安装平台上的铁磁材料干扰,导致磁场偏差,降低定位可靠性。传统校准方法需旋转传感器,对大型重型平台不适用。为此,本文提出鲁棒的同步定位与校准方法(RoSLAC),基于交替优化迭代估计平台姿态与磁力计校准参数。在高保真仿真与真实环境中的大量实验表明,该方法实现高精度定位,同时计算成本低于现有先进校准技术。
原文摘要 · Abstract (English)
Localization of autonomous mobile robots (AMRs) in enclosed or semi-enclosed environments such as offices, hotels, hospitals, indoor parking facilities, and underground spaces where GPS signals are weak or unavailable remains a major obstacle to the deployment of fully autonomous systems. Infrastructure-based localization approaches, such as QR codes and RFID, are constrained by high installation and maintenance costs as well as limited flexibility, while onboard sensor-based methods, including LiDAR- and vision-based solutions, are affected by ambiguous geometric features and frequent occlusions caused by dynamic obstacles such as pedestrians. Ambient magnetic field (AMF)-based localization has therefore attracted growing interest in recent years because it does not rely on external infrastructure or geometric features, making it well-suited for AMR applications such as service robots and security robots. However, magnetometer measurements are often corrupted by distortions caused by ferromagnetic materials present on the sensor platform, which bias the AMF and degrade localization reliability. As a result, accurate magnetometer calibration to estimate distortion parameters becomes essential. Conventional calibration methods that rely on rotating the magnetometer are impractical for large and heavy platforms. To address this limitation, this paper proposes a robust simultaneous localization and calibration (RoSLAC) approach based on alternating optimization, which iteratively and efficiently estimates both the platform pose and magnetometer calibration parameters. Extensive evaluations conducted in high-fidelity simulation and real-world environments demonstrate that the proposed RoSLAC method achieves high localization accuracy while maintaining low computational cost compared with state-of-the-art magnetometer calibration techniques.
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