RTLS in manufacturing is used to track and validate the real-time location of tools, assets and operators across the shop floor. By providing continuous visibility into movements and processes, RTLS improves production traceability, reduces search time and enables more efficient, data-driven workflows.
RTLS provides continuous, real-time location tracking of objects within a space, allowing manufacturers to monitor movement and position at any moment. RFID, on the other hand, is typically used for identification at specific checkpoints, such as scanning a part at a workstation, rather than tracking its continuous movement.
Real-Time Location Systems (RTLS) can use different underlying technologies to track the position of tools, assets and operators. The most common are Wi-Fi, Bluetooth, Ultra-Wideband (UWB) and ultrasonic RTLS. The key difference between them lies in how they measure distance and the level of accuracy they can achieve.
Wi-Fi-based RTLS uses existing wireless infrastructure to estimate location, typically based on signal strength (RSSI). While easy to deploy, Wi-Fi systems offer relatively low accuracy, usually within several meters. This makes them suitable for general asset tracking, but not for precision manufacturing applications.
Bluetooth Low Energy (BLE) systems also rely on signal strength to estimate position. They are more cost-effective and energy-efficient than Wi-Fi, but accuracy is still limited, typically ranging from 1 to 5 meters. Bluetooth RTLS is often used for basic indoor tracking but lacks the precision needed for assembly validation or tool positioning.
UWB systems use radiofrequency signals with precise time-of-flight measurements to calculate distance. This allows for higher accuracy than Wi-Fi or Bluetooth, typically in the range of 10–30 cm. However, in industrial environments with metal surfaces, UWB signals can suffer from multipath interference, where reflections distort positioning accuracy.
Ultrasonic RTLS systems use sound waves to measure distance between tags and anchors. Because ultrasound travels much slower than radiofrequency signals, distance measurements can be made with extremely high precision.
This enables positioning accuracy down to 1.5 mm, making ultrasonic RTLS ideal for demanding manufacturing applications such as tool position control, assembly verification and real-time operator guidance.
In addition, ultrasonic signals behave differently in industrial environments. Instead of reflecting sharply like RF signals, they diffuse and dissipate, reducing the impact of multipath interference. This makes ultrasonic RTLS more reliable in environments with high volumes of metal, where traditional RF-based systems often struggle.
Industrial RTLS systems provide measurable improvements in production performance by enabling real-time visibility and control across the shopfloor.
Manufacturers implementing RTLS tracking systems often achieve faster workflows, improved accuracy and better operational visibility.