The inertial measurement device IMU belongs to the strapdown inertial navigation system. The system consists of two acceleration sensors and three speed sensors (gyro). The accelerometer is used to sense the acceleration component of the aircraft relative to the ground perpendicular. The speed sensor is used to feel the aircraft. Angle information, the sub-component mainly consists of two A/D converters AD7716BS and 64K E/EPROM memory X25650. The A/D converter uses the analog variables of the IMU sensors, converts them into digital information and then outputs them through the CPU. The aircraft's pitch angle, tilt angle and side slip angle. The E/EPROM memory mainly stores the linear curve of each sensor of the IMU and the part number and serial number of each sensor of the IMU. When the part is just turned on, the image processing unit reads the E/EPROM. The linear curve parameters provide initial information for subsequent angle calculations.