兩軸平臺(tái)穩(wěn)定系統(tǒng)中MEMS陀螺誤差建模與分析
[Abstract]:The platform stability system can isolate the disturbance of the moving carrier to the detection system, monitor the change of attitude and position of the platform in real time, and at the same time apply the reverse torque to compensate the external disturbance, so as to keep the dynamic attitude reference of the detector exactly unchanged. And through the photoelectric detector on the platform to achieve target monitoring or automatic tracking of moving targets. Gyroscope is the core sensitive element in the platform stabilization system, and its measurement precision directly affects the stability precision of the platform. MEMS gyroscope has the advantages of light weight, small volume, low price, low power consumption and high reliability, etc. It is widely used in military equipment and civilian facilities. However, due to the limitation of MEMS gyroscope machining materials in micrometer order and processing level, the measurement accuracy of MEMS gyroscope is still low at home and abroad. Improving the measuring accuracy of MEMS gyroscope is the key to promote the miniaturization of platform stabilization system. In this paper, a MEMS gyroscope signal acquisition system is designed for the two-axis platform stabilization system of micro-miniature photoelectric pods, and a gyro zero adjustment circuit with digital potentiometer as the core is added to the acquisition system. The zero center of gyro is adjusted by real-time control of digital potentiometer output by DSP. The change of ambient temperature is one of the most important factors affecting the measurement accuracy of MEMS gyroscope. Due to the miniaturized size and internal structure of MEMS gyroscope, its performance is sensitive to the variation of ambient temperature. Among them, the temperature change has the greatest influence on the zero-position output and scale factor of gyro. Therefore, this paper designs the full-temperature test experiment to obtain the zero-position characteristic of gyro and the experiment of adjusting digital potentiometer when the zero-position change of gyro is simulated by the power supply, and obtains the zero-position compensation model of gyro. By controlling the digital potentiometer, the zero-bit center can be adjusted. The temperature compensation experiment shows that the zero-position stability precision of gyro in the whole temperature range is greatly improved by the method of full-temperature measurement and digital potentiometer compensation, which has a certain practical value. The rotating speed calibration experiment of gyro at different temperature is designed. Three kinds of scale factor fitting method are adopted. By comparing the residual error of fitting curve, it is concluded that the residual error of rotating speed segment fitting method is the least and the effect is the best. Gyro random drift error is also one of the main sources of gyro measurement error. The time series analysis method is used to model the random drift sampling data of MEMS gyroscope by ARMA. The AR (1) model is determined to be the best error model by the minimum AIC criterion. On the basis of this model, the random drift data is filtered by Kalman filtering method, and the random error of gyro is analyzed by Allan variance before and after filtering. The results show that the Kalman filtering method is effective and feasible in gyro random error filtering.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TN965;TH-39
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