Angle measurement is the basic problem of mechanical testing theory and technology. High-precision angle measuring sensor is the core component that is irreplaceable for scientific research, advanced manufacturing and test measurement. In this paper, for the long-term technical problems of difficult to suppress the shaft axis error of the circular grating angle measuring sensor, the size and precision are difficult to reconcile, a new concept of multi-grating angle measuring sensor is proposed, and the error of the sensor itself, installation error, electronic subdivision error, and multi-grating measurement are studied. The angle sensor suppresses the shafting error and establishes a simulation model. A multi-grating angle measuring sensor experimental system was built. The experimental results show that the angle error of the multi-grating angle measuring sensor is 134.32"". The proposal of multi-grating angle measuring sensor provides a new way for mechanical angle measurement theory and method.
The shafting error has a great influence on the measurement accuracy of the laser tracker. Based on the error expression form, a mathematical model is established for the eccentricity error of the shafting system, and the simulation analysis is carried out. The tilting error of the shafting system is obtained from the angle of the geometric angle and the moiré fringe respectively. A specific analysis was carried out. A laser tracker angle measuring system was built to analyze the shafting error in the system and correct the shafting error. The experimental results show that the original error of the laser tracker angle measurement is 189.31", and the corrected angle error is 127.13", which provides a theoretical basis for the highprecision measurement of the laser tracker.
Before the star sensor completes the attitude measurement task with the launch of the spacecraft, it must be calibrated on the ground. In order to meet the requirements of high precision star sensor calibration, according to some specific problems of optical structure of conventional ground calibration equipment in response to large aperture, long focal length and wide spectrum requirements, an off-axis collimator was designed as a collimating optical system, and the image quality was evaluated, and mechanical structure of the off-axis collimator was also designed in detail. Control technology of star brightness was researched and analyzed, and a set of lighting control system is designed. Analysis and test results show that a variety of seven consecutive magnitudes can be simulated by the lighting control system, and the simulated error between neighboring magnitudes is less than 8‰, to meet the current high precision star sensor calibration technical requirements.