The Modularization Circuit Technical Study Of High Precision Quartz Tuning Fork Gyroscope

Quartz tuning fork gyroscope which made by the quartz crystal materials is a vibrating-type angular rate sensor, which is manufactured based on a combination of the vibration inertial technology for MEMS and the micro machining technology. Its features are: small size, light weight, low power consumption, strong impact resistance, high reliability, fast response, long life, environmental applicability, suitable for mass production. Therefore, quartz tuning fork gyroscope is adapting to the information battlefield in the future. Development trend of the weapon system is to digital, intelligent and miniaturization. Micro inertial device as currently foreseeable fourth generation of inertial sensors, has been widely used in precision guided bombs, missiles and other military field of micro air vehicle. In fact, in recent years, the U.S. military and NATO in all wars, the precision-guided bombs and missiles had been extensive used to achieve a precise hit on target. In these smart weapons, the micro inertial system are used. Miniaturized, low-cost, mass production of the angular rate sensor is the basic unit of micro inertial system, so the prospect for military applications of quartz tuning fork gyroscope is very broad. Meanwhile quartz tuning fork gyroscope due to its own characteristics and has a distinctive dual nature, can further reduce costs, widely used in industrial fields such as the automotive industry, ship communications stable platform.This paper mainly researches on the processing circuit of gyroscope. High-precision, high-performance for the processing circuit of gyroscope is a guarantee for improving the level of quartz tuning fork gyroscope technology, improving the reliability and environmental adaptability. Firstly, present the working principle of quartz tuning fork gyroscope and circuit, then analyses in detail the structure characteristics of gyro sensitive chip as well as the characteristics of gyro signal processing. The research on high precision gyro circuit, through the research analysis, the factors affect the precision of gyroscope device characteristics influence on the precision of fog, high gain and low noise detection circuit design. Then research on error compensation technology by using the error of quartz tuning fork gyroscope, basic theory of error compensation and experimental data in several ways temperature compensation analysis. Then present several aspects of modular circuit from the tuning fork drive module circuit, phase-sensitive demodulation module circuit, low-pass filtering and signal amplification module circuits, temperature compensation module circuit and experimental verification. Finally, research on parameter setting technology, including calibration of basic parameters of quartz gyroscope, calibration of bias temperature error parameters, automatic calibration of bias warm error experiment and data analysis.Through the study of this subject to achieve the modularization of gyro circuit, and lay a solid foundation for the eventual realization of the batch production of the gyro.