IMU, AHRS, VRU, and INS are all inertial measurement products, but they provide different levels of functionality.

An IMU (Inertial Measurement Unit) is the basic inertial sensing component. It typically contains gyroscopes and accelerometers to measure angular velocity and acceleration along multiple axes. An IMU provides raw motion data but does not calculate navigation information by itself.

An AHRS (Attitude and Heading Reference System) processes IMU data to provide attitude information, including roll, pitch, and heading angles.

A VRU (Vertical Reference Unit) focuses mainly on providing accurate roll and pitch measurements relative to gravity, commonly used in stabilization applications.

An INS (Inertial Navigation System) is a complete navigation solution that combines IMU data with advanced algorithms to calculate position, velocity, attitude, and navigation trajectory.

In simple terms:

• IMU = Measures motion
• AHRS = Provides attitude and heading
• VRU = Provides stabilized orientation
• INS = Provides complete navigation information

Choosing the right system depends on application requirements, accuracy needs, and whether independent navigation capability is required.

For sensors, parts and modules: in stock-one week; no stock-2-4 weeks; For systems, generally, 8-12 weeks.

After confirming that the product has quality problems, we will replace it for you free of charge in the shortest possible time.

The accuracy of an inertial sensor depends on its technology, design structure, calibration process, and application requirements.

MEMS gyroscopes use micro-electromechanical structures to measure angular movement. They offer advantages such as compact size, low power consumption, fast response, and cost efficiency. MEMS-based IMUs are widely used in UAVs, robotics, industrial equipment, and portable navigation systems.

Fiber Optic Gyroscopes (FOG) use the Sagnac effect to detect rotation through optical signals transmitted in fiber coils. Compared with MEMS technology, FOG solutions generally provide higher stability, lower drift, and better long-term navigation performance.

The selection between MEMS and FOG depends on the required accuracy level:

• MEMS solutions are suitable for cost-effective and compact applications.
• FOG solutions are suitable for high-precision navigation applications requiring superior stability.

Ericco develops different inertial navigation products to meet various application requirements, including industrial, aerospace, marine, surveying, and autonomous navigation fields.

Inertial Navigation Systems (INS) are widely used in applications where accurate positioning, attitude measurement, and reliable navigation information are required.

Common applications include:

UAV and Drone Navigation
INS provides stable attitude and navigation data for autonomous flight, especially when GPS signals become weak or unavailable.

Aerospace Systems
Aircraft, satellites, and aerospace equipment use inertial navigation technology for reliable navigation and control.

Marine Navigation
INS solutions support ships, underwater vehicles, and marine equipment operating in challenging environments.

Surveying and Mapping
High-precision inertial systems are used with GNSS or surveying equipment to improve positioning accuracy and operational efficiency.

Autonomous Vehicles and Robotics
INS helps autonomous systems understand movement direction, speed, and orientation.

The major advantage of INS technology is its ability to provide continuous navigation information without depending entirely on external signals.

Ericco offers inertial navigation solutions based on MEMS and FOG technologies for different industrial applications.

A Fiber Optic Gyroscope (FOG) is a high-performance inertial sensor that measures rotation based on the Sagnac effect.

Inside a FOG, light travels in two opposite directions through a fiber optic coil. When the sensor rotates, the two light beams experience a phase difference. This difference is measured and processed to calculate the angular velocity of the rotation.

Compared with traditional mechanical gyroscopes, FOG technology has no moving parts, which provides advantages including:

• High reliability
• Long operational life
• Strong environmental adaptability
• Excellent stability

FOG sensors are commonly used in high-precision navigation systems, including aerospace equipment, marine vehicles, surveying instruments, and advanced INS solutions.

Ericco develops Fiber Optic Gyroscope solutions and integrated navigation systems designed to provide reliable attitude, heading, and navigation information for demanding applications.

A North Finder, also called a North Seeker, is a precision navigation device used to determine true north without relying on external navigation signals.

Most modern North Finding systems use gyroscopes and accelerometers to detect the Earth's rotation and gravity direction. By analyzing these measurements through advanced algorithms, the system can calculate the true north direction accurately.

Compared with magnetic compasses, gyro-based North Finders are less affected by magnetic interference from surrounding environments, making them suitable for applications requiring higher accuracy.

North Finders are widely used in:

• Surveying and mapping
• Geological exploration
• Military navigation
• Tunnel engineering
• Autonomous systems

Ericco provides North Finding solutions based on advanced inertial technologies, including MEMS and Fiber Optic Gyroscope technologies, to support high-precision direction measurement requirements.

GPS and INS are two different navigation technologies with different advantages.

GPS determines location by receiving signals from satellites. It provides accurate positioning information but depends on continuous satellite communication. GPS performance may decrease in environments with signal blockage, interference, or limited visibility.

INS calculates navigation information using internal sensors such as gyroscopes and accelerometers. It does not require external signals and can continue working in GPS-denied environments.

The main differences are:

GPS:

• External satellite dependency
• Provides global positioning
• Vulnerable to signal interruption

INS:

• Independent operation
• Provides continuous navigation
• Works in challenging environments

In many advanced systems, GPS and INS are integrated together. GPS provides position correction, while INS maintains continuous navigation when GPS signals are unavailable.

Ericco develops integrated navigation solutions combining INS and GNSS technologies for improved accuracy and reliability.

Choosing the right inertial sensor depends on several factors, including accuracy requirements, operating environment, size limitations, and budget.

When selecting an IMU or INS solution, consider:

Accuracy Requirements
High-precision applications such as aerospace and surveying may require FOG-based INS solutions, while industrial applications may use MEMS-based systems.

Environmental Conditions
Temperature range, vibration, shock resistance, and electromagnetic interference should be considered.

Navigation Requirements
If only motion measurement is needed, an IMU may be sufficient. If complete navigation information is required, an INS solution is recommended.

Integration Requirements
Some applications require GNSS integration, while others require independent navigation capability.

Ericco engineers can provide technical recommendations based on specific application requirements and help customers select suitable inertial navigation solutions.