Online Indoor Localization Using DOA of Wireless Signals
This addresses localization for mobile robots in dynamic indoor settings, offering an incremental improvement over existing methods by eliminating the need for offline fingerprinting.
The paper tackles indoor localization of mobile robots in GPS-denied environments by proposing a particle filter method using Direction of Arrival estimates, achieving meter-level accuracy with high computational efficiency that enables online operation without an offline phase.
Localization of a wireless mobile device or a robot in indoor and GPS-denied environments is a difficult problem, particularly in dynamic scenarios where traditional cameras and LIDAR-based alternative sensing and localization modalities may fail. We propose a method for estimating the location of a mobile robot in relation to static wireless sensor nodes (WSN) deployed in the environment. The method employs a novel particle filter that updates its weights using a Gauss probability over Direction of Arrival (DOA) estimate in conjunction with the mobile robot's mobility model. We evaluate and validate the proposed method in terms of accuracy and computational efficiency through extensive simulations and public real-world measurement datasets, comparing with standard state-of-the-art localization approaches. The results show considerably high meter-level localization accuracy balanced by the high computational efficiency, enabling it to use online without a need for a dedicated offline phase as in typical fingerprint-based localization algorithms.