AHRS refers to the attitude and attitude reference system. It includes multiple axial sensors that can provide the aircraft with heading, roll, and roll information. Such systems are used to provide accurate and reliable attitude and navigation information for the aircraft. The heading reference system includes a MEMS-based three-axis gyroscope, accelerometer, and magnetometer.
The difference between the heading reference system and the inertial measurement unit IMU is that the heading reference system (AHRS) contains an embedded attitude data solution unit and heading information. The inertial measurement unit (IMU) only provides sensor data and does not provide accurate Reliable attitude data function. The heading solution unit used for multi-sensor data fusion in the commonly used heading reference system (AHRS) is a Kalman filter.
The heading reference system includes three-axis gyroscope, accelerometer and magnetometer. The difference between the heading reference system and the inertial measurement unit IMU is that the heading reference system (AHRS) contains an embedded attitude data solution unit and heading information. The inertial measurement unit (IMU) only provides sensor data and does not provide accurate Reliable attitude data function. The heading solution unit used for multi-sensor data fusion in the commonly used heading reference system (AHRS) is a Kalman filter.
AHRS sensors are usually low-cost mems sensors, and the gyroscope and accelerometer of this sensor are relatively noisy. Taking plane gyroscope as an example, integrating with ADI's gyroscope will drift about 2 degrees in one minute. Under this premise, if there is no magnetic field and gravity field to correct the three-axis gyroscope, it will drift about 2 degrees in one minute. Then basically after 3 minutes the actual attitude of the object and the measured output attitude will be completely changed, so the field vector must be used to correct it under this low-cost gyroscope and accelerometer architecture. IMU is actually like this, only relatively accurate sensors, the gyroscope of IMU is a fiber optic gyroscope or mechanical gyroscope, the cost of this gyroscope is very high, the accuracy is also very high precision compared to mems gyroscope.
AHRS is composed of accelerometer, magnetometer and gyroscope. The real reference of AHRS comes from the earth's gravity field and the earth's magnetic field. In other words, if AHRS is away from the earth's gravity and magnetic field environment, it cannot work normally. That is, if the magnetic field is parallel to the gravitational field, like at the north and south poles. The magnetic field here is going down, in the same direction as the weight field. At this time, the route intersection can not be measured, which is the defect of the attitude system, and the route Angle error will be more and more large at high latitudes.
IMU is the inertial measurement unit, all the motion can be broken down into a linear motion and a rotating motion, so the inertial measurement unit is to measure these two kinds of motion, the linear motion can be measured by the accelerometer, the rotating motion is through the gyroscope.
Peculiarity
High-precision 360-degree all-round position and attitude output, using Euler Angle will have universal lock, can not be turned in all directions
Efficient data fusion algorithms combine fast dynamic response with long-term stability (no drift, no accumulated errors)
Application field
AHRS originally originated from aircrafts related technology, but in recent years, with the continuous reduction of cost of components, it has been widely used in motor vehicles and drones, industrial equipment, cameras and antenna head, ground and underwater equipment, life motion science analysis, virtual reality, game interface, indoor positioning and other products requiring 3D attitude measurement.
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