Plug and play module enables accurate indoor positioning for wearables
A Black-Box Positioning Solution for Effortless Integration in Wearable Navigation
RoboticsHardware Architecture
Summary
Positioning and navigation inside buildings or areas without good GPS signals is hard but important for many technologies like safety and augmented reality. The authors introduce a small, easy-to-use device called PDR Sensor that estimates a person’s position by measuring their steps and movements without needing complicated setup. This device combines hardware and software to give accurate location updates quickly and with low power use. It works well in different conditions and can be easily added to wearable gadgets or IoT devices, helping developers save time and effort. Future improvements aim to make it even smaller, smarter, and more energy efficient.
What this means in practice
- •For wearable device developers: Integrate a ready-made positioning module to provide accurate indoor location updates without designing complex algorithms.
- •For industrial safety teams: Use a compact sensor module to track workers’ positions in GPS-poor environments to enhance safety monitoring.
Authors
Anh-Van Vu, Changmin Sung, Dongsoo Han
Abstract
Accurate localization is critical for a wide range of applications, including navigation, augmented reality, safety management, and healthcare. However, achieving accurate positioning remains challenging, especially in GPS-degraded environments. Pedestrian Dead Reckoning (PDR), which estimates position based on inertial sensor data, offers a promising alternative but typically demands substantial effort in algorithm design and system integration. This complexity often leads to prolonged development timelines and elevated costs. To address these challenges, we present the PDR Sensor (PDRS), a plug-and-play, black-box PDR module optimized for seamless integration into wearable and IoT platforms. PDRS integrates a microprocessor and an inertial measurement unit (IMU) within a compact, low-power module. It executes real-time sensor fusion onboard, providing position updates via standard interfaces (I2C, SPI, UART). Experimental evaluations demonstrate its high robustness, achieving a step detection error of just 0.16% over 1250 steps and a traveled distance error of 1.87% under diverse conditions. The system further exhibits low latency (2.5 ms) and modest power consumption (52.35 mA). Unlike conventional studies, the PDRS leverages a holistic co-design of hardware and software to enhance performance and integration aspects, simplifying adoption without requiring deep expertise. By lowering technical barriers, PDRS enables developers and researchers to prioritize innovation in IoT and wearable technologies, accelerating prototyping, reducing development time, and advancing industry progress. Future work aims to enhance accuracy, reduce power usage and module size, and integrate AI-driven techniques to better mitigate drift.