Real-time and online error testing and compensating method of rotary table angle measuring system

Abstract

The invention discloses a error real-time and online error testing and compensating method of a rotary table angle measuring system, which comprises the steps of: testing a signal output by a controller to ensure that a rotary table system starts a closed loop, monitoring and correcting the signal u(t) output by the controller by using an oscilloscope, giving a rotating speed of the rotary table system, selecting specific rotating speeds 10 DEG / sec, 20 DEG / sec and 30 DEG / sec capable of enabling the system to reproduce, track and amplify a harmonic error signal frequency band within a closed loop bandwidth of the rotary table system, after the speed of the rotary table system is stable and constant, observing and analyzing a harmonic error of the signal output by the controller, and compensating the harmonic error. The real-time and online error testing and compensating method has the characteristics of being clear in error testing and compensating effect of the angle measuring system at a glance, increasing testing and compensating efficiencies, and overcoming the problem that the error testing and compensating method of the angle measuring system comprises complex processes of external precise reference testing and calibrating. Meanwhile, the real-time and online error testing and compensating method has the advantages of high reliability and high timeliness, and has the compensating regulation precision completely meeting the actual requirement of the angle measuring system.

Description

technical field [0001] The invention relates to an inertial navigation test technology, in particular to a real-time on-line test and compensation method for an angle measurement system error of a turntable. Background technique [0002] Turntables (including high-precision rotating equipment such as test turntables, simulation turntables, and centrifuges) are mainly used for precision inspection and error calibration of precision instruments such as inertial systems or inertial instruments because they can provide high-precision spatial orientation, speed, and acceleration references. , performance testing, and simulation research; the turntable is an indispensable and important equipment in the fields of aviation, aerospace, navigation, national defense and military affairs, so the accuracy index of the turntable system is very important; the accuracy of the turntable system mainly depends on the accuracy of the angle measurement system, and the influence There are many ac...

AI Technical Summary

Problems solved by technology

[0002] Turntables (including high-precision rotating equipment such as test turntables, simulation turntables, and centrifuges) are mainly used for precision inspection and error calibration of precision instruments such as inertial systems or inertial instruments because they can provide high-precision spatial orientation, speed, and acceleration references. , performance testing, and simulation research; the turntable is an indispensable and important equipment in the fields of aviation, aerospace, navigation, national defense and military affairs, so the accuracy index of the turntable system is very important; the accuracy of the turntable system mainly depends on the accuracy of the angle measurement system, and the influence There are many accuracy factors of the angle measurement system, such as the installation error of the mechanical system (usually in the form of a long period) and the error of the electrical system (in the form of a short period), etc. In practice, the error of the electrical system is the main factor causing the error drift of the angle measurement system; the turntable How to ensure the long-term stability and reliability of the system accuracy after the system is delivered, accepted and put into use is the most concerned issue for users; for this reason, the usual practice is to regularly test and calibrate the accuracy of the turntable angle measurement system. The process is to use high-precision External benchmarks, such as toothed discs, multi-faceted prisms, and autocollimators, are tested point by point under the operation of professionals, and the form and amplitude of harmonic errors are found through analysis. Carry out the calibration test of the angle measurement system to observe the compensation effect. If the requirements are not met, the calibration test must be repeated several times until the harmonic error meets the requirements. The test compensation process is cumbersome. The adjustment is carried out separately, the compensation effect cannot be directly observed online, and the compensation adjustment is time-consuming and laborious and has blindness; because the error of the angle measurement system cannot be found in time during use, it cannot be guaranteed that the angle measurement accuracy will drift between detection cycles, resulting in test The accuracy is out of tolerance, which affects the performance of the turntable system

Therefore, the existing test methods for the accuracy of the angle measurement system of the turntable lack timeliness, and cannot monitor the accuracy of the angle measurement system online in real time, and lack a method that can monitor and compensate the accuracy of the angle measurement system online in real time during the operation of the turntable system

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