Inertial Measurement Units (IMUs)
Reliable Motion Sensing for UAVs, Robotics, Defence, Survey and Industrial Systems
An Inertial Measurement Unit (IMU) is a sensor that measures acceleration, rotation and sometimes magnetic field on three axes. Because of this, an IMU helps a system track motion, follow changes in orientation, stabilise platforms and support navigation or control tasks.
Metromatics supplies a wide range of industrial and tactical IMUs from trusted global manufacturers. These sensors offer accurate inertial data for UAVs, robots, defence vehicles, autonomous systems, marine platforms and industrial machinery. In addition, they are built for tough conditions and work well across many environments.
Read more about Inertial Measurement Units
What Is an IMU?
An IMU normally includes:
- 3-axis gyroscopes – measure rotation rate
- 3-axis accelerometers – measure acceleration
- 3-axis magnetometers (optional) – support heading
IMUs send out raw motion data at high speed. Because of this fast output, they are useful for:
- Stabilisation
- Dead-reckoning
- Motion tracking
- Orientation estimation
- Feedback control
- Sensor fusion with GNSS, odometry or vision systems
As a result, IMUs act as the base sensor for AHRS units, INS systems and GNSS/INS navigation solutions.
Types of IMUs Available
Industrial-Grade IMUs
These IMUs use calibrated, low-noise sensors. Because of this, they work well in robotics, commercial UAVs, automation and survey platforms.
Tactical-Grade IMUs
Tactical IMUs have very low drift and high stability. They are often used in defence, aerospace and long-duration autonomous systems.
Magnetometer-Assisted IMUs
These IMUs include magnetic calibration. As a result, they are better for heading, antenna alignment and orientation tasks.
Compact and Embedded IMUs
These are small and lightweight. Therefore, they are ideal for drones, small robots and handheld systems.
Key Features of Modern IMUs
- High-rate inertial data output (often 800 Hz to 1 kHz+)
- Temperature-compensated calibration for stable accuracy
- Rugged design for vibration and shock
- Common interfaces: UART, USB, SPI, CAN or Ethernet
- Simple integration with flight controllers, robotics tools and fusion software
Typical Applications for IMUs
UAVs and Drones
- Flight stabilisation
- Navigation support
- Gimbal and payload control
Military and Defence
- Targeting and guidance
- Weapon and sensor stabilisation
- Navigation in GPS-limited areas
Robotics and Automation
- SLAM and localisation
- Mobile robot navigation
- Joint and arm feedback
Survey and Mapping
- LiDAR and camera motion correction
- Platform stabilisation
Marine and Subsea
- AUV and ROV attitude tracking
- Antenna and sensor alignment
Industrial Machinery
- Motion monitoring
- Platform leveling
- Control loop feedback
IMUs Supplied by Metromatics
Metromatics supplies IMUs across many performance levels. This includes:
- Compact IMUs for UAVs, robotics and portable systems
- Industrial IMUs for machinery and automation
- Tactical IMUs for defence and aerospace
- Magnetometer-assisted IMUs for heading tasks
How to Choose the Right IMU
| Requirement | Recommended IMU Type |
|---|---|
| Lightweight UAVs or small robots | Compact industrial IMU |
| Need stable magnetic heading | Magnetometer-assisted IMU |
| High vibration or shock | Rugged IMU |
| Low drift and long-term stability | Tactical IMU |
| Custom fusion or control algorithms | High-rate raw data IMU |
FAQ’s About IMUs
Q1. What is the difference between an IMU and an AHRS?
An IMU measures acceleration and rotation. However, an AHRS uses an IMU plus algorithms to output roll, pitch and yaw.
Q2. Do IMUs work without GPS?
Yes. IMUs do not need GNSS. However, combining IMUs with GNSS improves long-term navigation accuracy.
Q3. Can IMUs work in high-vibration areas?
Yes. Industrial and tactical IMUs are built for vibration, fast motion and harsh conditions.
Q4. What are the main performance differences?
Consumer IMUs have more drift. Industrial IMUs are stable. Tactical IMUs offer very low drift and high accuracy.
Why Buy IMUs from Metromatics?
- Access to trusted global IMU brands
- Local engineering support in Australia
- Experience in defence, robotics, UAVs and industry
- Help with sensor selection and integration
