Citation: | Si Minghua, Wang Weiming, Zhang Yong, et al. Research on dynamic angle measurement method based on electro-optical servo platform[J]. Opto-Electronic Engineering, 2019, 46(10): 180445. doi: 10.12086/oee.2019.180445 |
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Overview: In the field of military and industrial production, it is often necessary to measure the dynamic corners of large rotating equipment. This type of rotating angle, which cannot be measured directly by angle measuring equipment, requires indirect measurement with the help of a sensor, and the measured angle is calculated according to the sensor data. Aiming at the problems of high measurement cost and low precision of dynamic angle measurement methods such as inertial measurement method, double theodolite measurement method, and three coordinate measurement method, an electro-optical measurement method based on non-cooperative target vision tracking is presented. Mathematical calculation model and dynamic compensation model for dynamic angle measurement are established. Using electro-optical servo platform mounted on the measured object to carry the camera and the laser rangefinder for the real time tracking and distance measurement of the non-cooperative target, the dynamic angle value is calculated according to the conversion relationship between the high precision angle of measurement of the servo system and the distance of the non-cooperative target and compensating the angle value according to the dynamic compensation model.
A dynamic angle measuring device is developed. The servo system structure adopts the azimuth and pitch double frame structure, the inner frame is the pitch channel, the outer frame is the azimuth channel, and the camera and the laser rangefinder are installed in the inner frame. The frame is driven directly by the permanent magnet synchronous motor, and the 16-bit rotary transformer is used as the angle measuring unit. Futhermore, its precision calibration and error analysis are carried out and accuracy of servo system up to 30" after calibration.
The servo control adopts the speed position double closed loop, using the instantaneous angular rate of the rate Gyro induction camera installed in the inner frame. This angular rate is regarded as the speed loop feedback, which make up of the closed loop with servo motor composition speed to isolate the disturbance of the carrier. Achieving stable tracking of non-cooperative goals, the non-cooperative target miss is used as the position ring input, and the spin angle is used as the feedback quantity to form the position closed loop. Using the high precision manual displacement table to simulate the measured dynamic angle, the feasibility of the measuring method is verified. The experimental results show that the measured angle error is 0.09° within the range of 11.082 m and angle measuring range reaches ±80°.
Mathematical model diagram of measurement
Visual axis offset graph
Schematic diagram of the measurement setup
Physical diagram of measurement setup. (a) Overall diagram; (b) Rotary table; (c) Measuring device
Schematic diagram of the calibration process
Tracking sequence images
Target tracking flowchart
The distribution chart of angle measurement error