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Imu
2666 3 2018-11-12
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Spark_Pilot_XxXx
Second Officer
Flight distance : 67841 ft
Germany
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Just a General question. What ist the accelormeter and the gyro for?

2018-11-12
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Aardvark
Captain
Flight distance : 384432 ft
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United Kingdom
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They are used to keep the aircraft level, and to detect movement in any of the three axis.

When the aircraft hovers, it is continually adjusting the motor speeds on each arm to keep the aircraft level, based upon data received from the IMU (Inertial Measurement Unit). This is why IMU is best calibrated on a flat, level surface.
2018-11-12
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DJI Natalia
Administrator

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Hi there. I appreciate your time bringing this query to us. Regarding your concern, Accelerometer is used to measure acceleration. Basically the sensors measures some electrical quantity like capacitance, current or voltage based on the acceleration it senses . The electrical quantity is then converted to its equivalent acceleration reading. Now a days any smartphone contains accelerometer. While the Gyroscopes measures angular velocity. Here also the sensors measure some change in capacitance proportional to the angular velocity the sensor is experiencing.
2018-11-12
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hallmark007
Captain
Flight distance : 9812789 ft
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Ireland
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From flight school.

Gyro.

The main function of gyroscope technology is to improve the drones flight capabilities.  The drone’s hardware, software and algorithms work together to improve all aspects of the flight including hovering perfectly still or taking steep angled turns.  A drone with six axis gimbal feeds information to the IMU and flight controller to vastly improve the flight capabilities.

The gyroscope needs to work almost instantly to the forces moving against the drone (gravity, wind etc) to keep it stabilized.  The gyroscope provides essential navigational information to the central flight control systems.

In the vast majority of drones, the gyroscope is encompassed or integrated within the IMU (Inertial Measurement Unit).  The drone IMU, along with  satellite positioning (GPS and GLONASS) are also components of the flight controller system.

An inertial measurement unit works by detecting the current rate of acceleration using one or more accelerometers. The IMU detects changes in rotational attributes like pitch, roll and yaw using one or more gyroscopes.  Some IMU on drones include a magnetometer, mostly to assist calibration against orientation drift.
On board processors continually calculate the drones current position. First, it integrates the sensed acceleration, together with an estimate of gravity, to calculate the current velocity. Then it integrates the velocity to calculate the current position.
To fly in any direction, the flight controller gathers the IMU data on present positioning, then sends new data to the motor electronic speed controllers (ESC). These electronic speed controllers signal to the motors the level of thrust and speed required for the quadcopter to fly or hover.
D.W.
2018-11-14
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