Research Of The Signal Detection System Of Vibrating String Gyroscope

Gyroscope is a kind of sensor used to measure the angular velocity of objects,which is widely used in Navy,army,air force,civil and other fields.The traditional micromechanical gyroscope based on Coriolis Effect mostly uses the method of amplitude detection,which can hardly strike the balance between microminiaturization and high accuracy of gyroscope.Frequency detection method is adopted in the vibrating string gyroscope.Finer vibrating string achieve the purpose of higher frequency,smaller volume and higher accuracy.Vibrating string gyroscope sees both miniaturization and accuracy of the sensor.Gyroscope has the problem of weak output signal while miniaturization,the accuracy is restricted by the signal detection circuit simultaneously.Various kinds of noises exist in the output signal.Therefore,the design of the gyro signal detection system is crucial.According to the characteristics of vibrating string gyroscope,a multi-channel signal measurement system using frequency detection is studied to ensure the accuracy and acquisition stability of angular velocity signal.In this paper,vibrating string gyroscope based on the Coriolis Effect is studied.Aiming at the solve the problems of weak signal and multiple output signals,the angular velocity detection circuit based on frequency detection and the digital measurement and circuit is designed,the prototype of vibrating string gyroscope is manufactured to simulate and optimize the detection circuit of gyroscope.The main work is as follows:Firstly,the basic theory and working principle of the vibrating gyroscope is introduced,establishes the basic structure model of the vibrating gyroscope.The frequency detection mechanism of the vibrating gyroscope is studied to provide the theoretical basis for the design of the signal detection system.The error of the system is analyzed along with its influence on the accuracy of the gyroscope.Main factors that affect the measurement accuracy in the system are summarized.And the method to improve the precision is proposed.Secondly,on the hardware circuit,a low-frequency signal detection system based on C8051F340 single-chip microcomputer is designed according to the model parameters of the vibrating wire gyroscope prototype,as the first scheme.Vibration measurement module,communication module,power supply module and display module forms the complete system,and the vibration measurement module is simulated.Furthermore,in order to meet the miniaturization and high precision of vibrating string gyroscope in the future,a high frequency signal detection system based on STM32F103ZET6 is designed.In view of the characteristics of the high frequency signal,the clock module and the storage module are designed in the system.The signal amplification circuit,the filter circuit and the shaping circuit are simulated and optimized for high frequency signal.In addition,the software of each component of the circuit is designed to ensure the normal operation of the hardware.C language is mainly used in the software design by adopting Modular design structure.At last,the fabrication and assembly process of the gyro prototype are introduced.The feasibility of high frequency signal detection scheme is verified by numerical simulation and hardware circuit simulation.The accuracy of the gyroscope at different detection frequencies is analyzed by software simulation.The simulation result of angular velocity error is close to the theoretical value.And in the frequency range of 1250 Hz ? 4000 Hz,with the increase of frequency,the size of the gyroscope becomes smaller,and the accuracy of the vibrating string gyroscope increases gradually.