Research On High-Precision Angle Measuring System And Automatic Error Compensation Technology

High-precison angle measurement system is a key research topics of the inertial test equipment, which belongs to the inertial technical subtopic of the eleventh five plan. With the development of aerospace engineering and navigation system, it sets higher requirement for the inertial test equipment. In terms of technical indicators, the inertial turntable must be high-precision, high-resolution, high-frequency response, wide speed regulation and super low rate. The precision of turntable depends on that of angle measurement. It requires a lot of manpower, material and financial resources if starting from hardware to improve the accuracy of angle measuring system. Therefore, all out for the inertial testing technology is the most effective shortcut to improve the angle measuring system, which includes the system error model establishment,error separation technology and compensation.With the mass production of the inertial turntable, the shortage of relevant laboratory staff is salient. So, the development of the automated test platform is imperative.The data analysis, delivery and processing with the computer is the efficiency method to cut down the testing cost, and to improve work efficiency.The thesis includes:The principles of the resolver, inductosyn and the dynamic error characteristics are analyzed. The circuit principle analysis of the resolver / inductosyn angle measurement based on AD2S80A resolver-to-angle converter is conducted.The errors of the resolver / inductosyn angle measurement system based on AD2S80A resolver-to-angle converter are analyzed. The error model is eatablished which includes long-period harmonic 1th~4th and short-period harmonic 1th~4th. All of these eight kinds of harmonic errors are orthogonal, except for the long-period harmonic 1th and the short-period harmonic 3th. Derived form the theory, if the two initial positions of the difference of 180 degrees, then the coupling relationship among the non-orthogonal harmonic components is the same value but in the opposite direction. According to this rule, the coupled harmonic errors can be separate effectively. Test results show that the VPP of the angle measurement errors decreased from the 15.8″to 1.7″after the error compensation.Automation test platform design based on 23-sided polygon and autocollimator was developed to mearsure the angular position error, which due to RTX to meet the high real-time requirements. The powerful graphics display of the Win32 makes the system be more structured. The upper computer is prepared in C++ Builder environment, which make the software to be easier to maintain and be more portability. Now, the software goes well in the turntable testing measurement.The test result indicates that the automation degree is very high which improves efficiency to shorten the testing time and the error compentation is better than the manual testing because of the residual error is smaller, so the automation platform improves the accuracy evidently.