A large-angle attitude angle measurement device and method for a three-axis air bearing platform

Abstract

The invention provides a device and a method for measuring a large-angle attitude angle of a triaxial air-bearing table, and belongs to the technical field of high-accuracy attitude control and measurement. A triaxial mechanical electric tracking turntable is installed on the outer side of a triaxial air-bearing table system, an eddy current displacement sensor is installed on the triaxial mechanical electric tracking turntable, a metal block is installed on the inner side of an instrument platform of the triaxial air-bearing table, the triaxial mechanical electric tracking turntable is controlled to track in real time after the triaxial air-bearing table moves, so that the measurement value l of the eddy current displacement sensor is not changed, the attitude angle of the triaxial air-bearing table is obtained by reading the moving angle value of the triaxial mechanical electric tracking turntable, and the numerical relationship of the error of the attitude angle of the triaxial air-bearing table and the related parameter is also analyzed. The device is high in measurement accuracy, does not occupy the space of the instrument platform, and has the advantages of real-time measurement, fast tracking, 360-degree full-revolving measurement and the like.

Description

technical field [0001] The invention relates to a large-angle attitude angle measuring device and method for a three-axis air bearing platform, belonging to the technical field of high-precision attitude control and measurement. Background technique [0002] As satellite model loads have higher and higher requirements for platform functions, the attitude and orbit control subsystem, as an important satellite subsystem, carries the key tasks for the success of the entire satellite. Many models require full physical tests to verify the corresponding functional models. As the core equipment of the full physical simulation test of the ground vehicle, the three-axis air bearing table has a small frictional moment when it is airborne, and can simulate the special mechanical environment of the satellite in orbit. Among them, the three-axis air bearing attitude measurement device is the key equipment of the three-axis air bearing, which is used to realize the real-time measurement a...

AI Technical Summary

Problems solved by technology

The optical fiber gyro combination is to obtain the angular position information by integrating the speed of the three-axis air bearing table. The gyro has the problem of drifting for a long time, so that the measurement accuracy does not meet the technical index requirements, and the gyro occupies a large space on the instrument platform; the use of laser The method for the tracker to measure the attitude angle of the three-axis air bearing table is to place the optical target ball on the three-axis air bearing table, and use the laser tracker under the table to track the optical target ball to obtain different position coordinates to calculate the attitude angle of the three-axis air bearing table Information, such as two or three laser trackers are required to achieve full-turn tracking, which increases project costs. This method also has problems such as slow tracking speed and small tracking angle.

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