Precision Inertial Sensors and Systems: IMU, GPS-INS, AHRS, MRU

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Inertial Labs is a leading designer and manufacturer of position and orientation tracking systems for unmanned vehicles, based on the fusion of inertial sensors with a range of other cutting-edge sensing technologies. With our engineering expertise, we create high-performance inertial sensor systems with small size and low power requirements.

Our products are ideal for a variety of unmanned systems applications, including motion tracking, weapon orientation tracking, payload stabilization, and inertial position tracking for GPS-denied environments.

IMU-P Inertial Measurement Units (IMU)

High Performance Industrial & Tactical Grade IMUs

The IMU-P is a light-weight and compact high performance Inertial Measurement Unit (IMU), designed for a number of applications including UAV and AUV/ROV navigation and control.

The unit contains three highly accurate Advanced MEMS gyroscopes and three ultra high performance accelerometers for precise linear acceleration and angular rate measurements.

The IMU-P is an ITAR free inertial solution, that is fully calibrated and compensated over its operating temperature range. Both Industrial and Tactical grade units are available.

Compact size (39 x 45 x 22 mm) and low weight (70 gram) – ideal for integrated system applications.

IMU-P Inertial Measurement Unit for UAVs

IMU-P Industrial and Tactical Grade IMUs

IMU-P Applications:

  • Antenna and Line of Sight Stabilization Systems
  • Motion Reference Units (MRU)
  • Motion Control Sensors (MCS)
  • Gimbals, EOC/IR, platforms orientation and stabilization
  • UAV & AUV/ROV navigation and control

Specifications:

“Industrial” IMU-P“Tactical” IMU-P
Gyroscope Bias in-run Stability3 deg/hr1 deg/hr
Gyroscopes noise density0.006 deg/sec√Hz0.004 deg/sec√Hz
Accelerometer Bias in-run Stability0.015 mg0.005 mg
Accelerometers noise density0.03 mg√Hz0.025 mg√Hz
Pitch & Roll static accuracy0.05 deg0.05 deg
Power Consumption0.8 @ 5V0.8 @ 5V
Operating temperature -40 to +85 deg C-40 to +85 deg C

OS3D-FG Orientation Sensor

Miniature AHRS for Unmanned Vehicles

The OS3D-FG is a miniature Attitude and Heading Reference System (AHRS) designed for real-time orientation tracking applications. It fuses data from tri-axial MEMS gyroscopes, tri-axial MEMS accelerometers and tri-axial fluxgate magnetometers using an onboard Digital Signal Processor and state-of-the-art algorithms.

The OS3D-FG is ideal for a wide range of small unmanned vehicles, including UAVs, ROVs and ground robotics.

OS3D-FG UAV Orientation Sensor

AHRS Orientation Sensor Applications:

  • Robotics
  • Small gimbals and EOS stabilization
  • Marine antenna stabilization systems
  • Small Unmanned Underwater Vehicles, ROV
  • Quadrotor Helicopters and micro UAV

Specifications:

Size45×16×14.5mm
Weight12 grams
Power Consumption0.15W
Output Data Rateup to 2000 Hz
Heading Accuracy 0.5 deg static, 1.5 deg dynamic
Attitude Accuracy 0.2 deg static, 0.7 deg dynamic
Gyroscope Bias in-run Stability10 deg/hr
Accelerometer Bias in-run Stability 0.15 mg

More Information: OS3D-FG Orientation Sensor

OS3D-DTS Digital Tilt Sensor

High Accuracy, Miniature MEMS Digital Tilt Sensor

The OS3D-DTS is an ultra-high accuracy, miniature dual axis MEMS Digital Tilt Sensor, designed for precision tilt measuring. It includes tri-axial MEMS Gyroscopes and tri-axial high precision MEMS Accelerometers; and is equipped with an onboard processor and embedded inclination and tilt algorithms allowing for direct integration into systems without interfacing a PC.

The low-SWaP, ITAR-free OS3D-FG is environmentally sealed (IP67) in a rugged enclosure, making it ideal for a wide range of unmanned applications, including UAVs, Robotics and Electro Optical Systems.

OS3D-DTS MEMS Digital Tilt Sensor

Digital Tilt Sensor Applications:

  • Robotics
  • Remote Weapons Stations (RWS) stabilization and pointing
  • Electro-Optical Systems (EOS) stabilization

Specifications:

Size26.5×19.5×7.4mm
Weight9 grams
Power Consumption125 mW (typical)
Pitch & Roll Resolution0.01 deg
Pitch & Roll Accuracy0.05 deg
Bandwidthup to 200 Hz
Operational Temperature Range-40 to +85 deg C

Attitude and Heading Reference Systems (AHRS)

AHRS-10 – High Accuracy AHRS

The AHRS-10 is a high-accuracy AHRS that outputs absolute orientation (heading, pitch and roll) for both motionless and dynamic applications. It integrates precision 3-axis accelerometers, magnetometers and gyroscopes to provide absolute pitch and roll data, real time device rotation data and ongoing gyroscope corrections.

AHRS-10 UAV AHRS

The AHRS-10 utilizes our high-performance Fluxgate Magnetometer technology for superior stability and repeatability, making it an ideal solution for unmanned systems applications where superior accuracy is required.

AHRS-10 Applications:

  • Point-to-point antenna stabilization and motion control
  • Antenna Reference Units (ARU)
  • Radar Reference Units (RRU)

Specifications:

ModelAHRS-10BAHRS-10P
Size90×27×26mm90×27×26mm
Weight77 grams843 grams
Heading Accuracy 0.8 deg static, 1.0 deg dynamic0.3 deg static, 0.6 deg dynamic
Pitch & Roll Accuracy 0.2 deg static, 0.5 deg dynamic0.1 deg static, 0.3 deg dynamic
Gyroscope Bias in-run Stability8 deg/hr1 deg/hr
Accelerometer Bias in-run Stability 0.005 mg0.005 mg
Magnetometer bias in-run stability0.8 nT0.2 nT

AHRS-II – Absolute Orientation AHRS

The AHRS-II is our family of next-generation AHRS featuring state-of-the-art algorithms for a wide range of dynamic motions of unmanned vehicles. Precision 3-axis accelerometers, magnetometers and gyroscopes provide heave, heading, pitch and roll data, as well as high-frequency real time device rotation data and ongoing gyroscope corrections.

OptoAHRSTM-II works through the use of reference images. A reference image is literally a picture of the horizon in a given direction. Within the reference image the system identifies a constellation of identifiable features.

AHRS-II Attitude and Heading Reference System

AHRS-II Applications:

  • Antenna pointing systems
  • Geospatial systems

Specifications:

 AHRS-II UAV AHRS OptoAHRS-II UAV AHRS
ModelAHRS-II-POptoAHRS-II
Size120 x 50 x 53 mm132 x 60 x 47 mm
Weight220g600g
Heading Accuracy0.3 deg<0.2 deg
Pitch & Roll Accuracy0.1 deg0.08 deg
Gyroscope Bias in-run Stability1 deg/hr1 deg/hr
Accelerometer Bias in-run Stability0.005 mg0.005 mg
Magnetometer Bias in-run Stability 0.2 nT0.1 nT

GPS-Aided Inertial Navigation Systems

GPS-INS for Unmanned Vehicles

Our family of GPS-Aided Inertial Navigation Systems combines support for multi-GNSS constellation signals (L1 & L2 GPS, GLONASS, GALILEO and BEIDOU) with state-of-the-art 3-axis accelerometers, magnetometers and gyroscopes to provide accurate position, velocity, heave and absolute orientation data for both unmanned aircraft and ground robotics.

Three different models of INS are available – Basic, Professional and Dual Antenna – to provide desired levels of accuracy and stability for your particular unmanned systems application.

INS Applications:

UAV GPS-Aided Inertial Navigation Systems

  • UAV/drone flight control systems in GPS-denied environments
  • Remote sensing
  • Low altitude photogrammetry
  • Law enforcement
  • Autonomous Vehicle Navigation Systems
  • Aerial Inspections – roads, bridges, power lines
  • Surveying / 3D mapping
  • Precision Agriculture
  • Military inspections
  • ADAS – Advanced Driver-Assistance Systems

Specifications:

 INS-B Inertial Navigation System INS-B Inertial Navigation System INS-D Inertial Navigation System
ModelINS-B (Basic)INS-P (Professional)INS-D, INS-DL (Dual Antenna)
Size120 x 50 x 53 mm120 x 50 x 53 mm120 x 50 x 53 mm
Weight220g280g320g
Position Accuracy1.5 m (GPS L1)
1.2 m (GPS L1&L2)
0.6 m (SBAS)
0.4 m (DGPS)
0.05 m (PP)
0.01 m + 1 ppm (RTK)
1.5 m (GPS L1)
1.2 m (GPS L1&L2)
0.6 m (SBAS)
0.4 m (DGPS)
0.05 m (PP)
0.01 m + 1 ppm (RTK)
1.5 m (GPS L1)
1.2 m (GPS L1&L2)
0.6 m (SBAS)
0.4 m (DGPS)
0.05 m (PP)
0.01 m + 1 ppm (RTK)
Heading Accuracy
(static | dynamic)
1 deg | 0.1 deg0.4 deg | 0.1 deg0.08 deg | 0.08 deg
(2m baseline)
Velocity Accuracy0.03 m/sec0.03 m/sec0.03 m/sec
Pitch & Roll Accuracy
(dynamic)
0.1 deg0.1 deg0.1 deg
Gyroscope Bias in-run Stability1 deg/hr1 deg/hr1 deg/hr
Accelerometer Bias in-run Stability0.005 mg0.005 mg0.005 mg

Dual Antenna GPS-Aided INS OEMOEM versions of our industrial and tactical grade dual antenna, GPS-aided INS are also available. Weighing just 115 g and measuring 85 x 47 x 36 mm, they can be easily integrated onto SWaP conscious platforms.

Motion Reference Units (MRU)

High Performance Motion Sensors

Our Motion Reference Units are high-performance strapdown motion sensors specifically designed for marine applications such as ROVs. Utilizing precision solid state 3-axis accelerometers, magnetometers, gyroscopes and barometric sensors, the units output highly accurate position, velocity, acceleration, heading, pitch & roll, and heave, sway & surge data.

The Motion Reference Units are available in three different models – Basic, Enhanced and Professional – to provide desired levels of accuracy and stability as well as the required outputs for your particular application.

Motion Reference Units

MRU Applications:

  • Marine surveys
  • Hydrography
  • Bathymetry

Video: MRU Qualification Tests

Model Comparison: Measured Parameters

 MRU-B UAV Motion Reference Unit MRU-B UAV Motion Reference Unit