What is an IMU tilt sensor and how does it work?

An IMU tilt sensor, short for Inertial Measurement Unit, is an innovative feature in modern RTK GNSS receivers (real-time kinematic satellite navigation). This sensor unit precisely measures the angular velocity, acceleration and magnetic field of the environment. By combining data from gyroscopes (rotation rate sensors), accelerometers and magnetometers, the IMU tilt sensor can continuously determine its own position, orientation and inclination in space.

Advantages of IMU tilt sensor technology:

• Simplified measurements: Thanks to IMU technology, there is no need to manually level the RTK GNSS receiver before each measurement. The sensor automatically compensates for slight inclinations of the receiver, ensuring precise measurements even in challenging environments.
• Time saving: Thanks to the automatic tilt correction, the IMU tilt sensor saves valuable time, especially when measuring a large number of points.
• Improve accessibility: Hard-to-reach points, such as edges of buildings, steep slopes or places under objects, can be measured easily and precisely with an IMU tilt sensor.

Accuracy and limitations:

Most modern RTK GNSS receivers with IMU tilt sensor allow tilts of up to 60 degrees, while some models are limited to 30 or even 15 degrees. It is important to note that there is always a slight compensation when using the IMU tilt sensor. When measuring at the limit of the tilt angle, this compensation can be up to 5 centimeters.

Additional information:

• Depending on the RTK GNSS receiver model, the IMU tilt sensor can be initialized by shaking or simply switching it on.
• Before purchasing an RTK GNSS receiver, check the specific tilt angle and compensation performance of the IMU tilt sensor.

In summary, the IMU tilt sensor is a valuable addition to modern RTK GNSS receivers that can significantly improve the efficiency, accuracy and flexibility of field surveying.