IMUs for UAVs, Drones and Unmanned Vehicles
What is an inertial measurement unit (IMU)?
An IMU (inertial measurement unit) is a device that combines inertial sensors – gyroscopes and accelerometers – to provide acceleration and orientation data that can be used to calculate position and velocity. Some models of IMU also incorporate magnetometers, which outputs measurements of the Earth’s magnetic field that can be used to improve the accuracy of orientation measurements. IMUs typically have one of each sensor per axis being measured, up to a maximum of three axes for measuring roll, pitch and yaw.
IMUs for UAVs and drones
Emcore Gyro-based Inertial Measurement Unit
IMUs are used for a variety of applications in UAVs and drones. They allow the aircraft to maintain stability and control while experiencing high winds or performing steep turning manoeuvres. They can also be used to enable highly accurate station-keeping or autonomous waypoint following.
Inertial measurement units may be used to provide data for an AHRS (Attitude and Heading Reference System), which calculates real-time attitude and heading for manned and unmanned aircraft, or an INS (Inertial Navigation System), which calculates position in addition to orientation.
Types of inertial measurement unit
Inertial Labs IMU P Inertial Measurement Unit for UAVs
Inertial measurement unit manufacturers typically manufacture units using one of four main technologies: Silicon MEMS (Micro-Electro-Mechanical Systems), Quartz MEMS, FOG (Fiber Optic Gyro), and RLG (Ring Laser Gyro).
Silicon MEMS IMUs incorporate miniaturized sensors that measure either the deflection of a mass due to movement, or the force required to hold a mass in place. They are ideal for smaller UAV platforms and high-volume production, as they can generally be manufactured cheaply in compact and lightweight form factors.
FOG IMUs use a solid-state technology based on firing laser beams through a coiled optical fiber. Typically larger and more costly than MEMS-based IMUs, they are often used in larger UAV platforms.
RLG IMUs utilise a similar principle to FOG IMUs but with a sealed ring cavity in place of an optical fiber. They are generally considered to be the most accurate option, but are also the most expensive of the IMU technologies and typically much larger than other IMU types.
Quartz MEMS IMUs use an inertial sensing element that is micro-machined from a single piece of quartz and driven by an oscillator to vibrate at a precise amplitude. The vibrations can be used to sense angular rate, producing a signal that can be amplified and converted into a DC signal proportional to the rate. With low SWaP-C (size, weight, power and cost) characteristics, they are well-suited to UAV inertial systems.
Products (49)
Related Articles
Innovative Silicon Photonics Optical Gyroscope Technology and Navigation Solutions for GPS-Denied Environments
Cutting-Edge Flight Controllers, Sensors, and Other Electronics Technologies for Drones & Robotics
BVLOS Solutions for UAS & UAM: Fuel Cells, Radar, Navigation Sensors, Flight Control & SATCOM
GNSS Positioning & Navigation Systems, Mobile Mapping UAV LiDAR & Unmanned Surface Vehicles
MEMS Inertial Sensor Solutions, IMUs, Gyroscopes and MEMS Accelerometers for Unmanned Vehicles
AI-based Inertial Navigation Systems (MEMS and FOG), Acoustic Positioning Solutions
High Performance FOG, RLG, and Quartz MEMS Inertial Sensors - Gyros, IRU, IMU, INS
Inertial Sensors, MEMS IMU, AHRS Systems, Vertical Reference Units & GNSS-INS for Unmanned Systems
Inertial Navigation Sensors: MEMS IMU, Accelerometers, Gyroscopes, AHRS, GPS-INS & Point Cloud Generation
Precise Positioning for Unmanned Vehicles: GPS & GNSS Receivers, Antennas & Inertial Systems
Join Thousands of Unmanned Systems Professionals
Sign up free to UST Pro to get full website access, the weekly eBrief and exclusive event discounts.
