Study On Thermal Compensation For The Angle Error Of Solid Vibration Gyro

As an important type of inertial devices, the solid vibration gyroscope, compared with the traditional mechanical and optical gyroscopes, has the advantage of small volume, light weight, low cost, resistance to impact and harsh environment, high reliability, long life etc. It has become a popular research content because of its extensive applications both in military and civil. However, the solid vibration gyroscope is constrained to low-level inertial systems presently for several weaknesses, such as high drift influenced by temperature, poor stability of zero voltage and low precision, among which temperature is the most significant factor. There are mainly two methods to reduce the influence of temperature on precision. The first one improves the stability of the temperature through the structure, material and technology of the gyro, while the second method is based on the testing, statistical analysis, modeling and compensation of the sensor's error. According to the existing technology, this paper concentrates on the latter method. The primary researches are listed as follows.1. The structure, operating principle and performance index of the vibration beam piezoelectric gyroscope were researched in detail, and the temperature characteristics of drift were also analyzed.2. The hardware and software used for drift testing were designed and fabricated. The hardware includes inertial sensors and their testing system, interface circuit etc. And the software comprises data acquisition by microcomputer, monitoring by PC and serial communication between microcomputer and PC.3. Full-temperature testing of gyro's drift was performed. For the non-linear variation between the drift and temperature, the RBF neural network was adopted for modeling and compensating in a full-temperature range. The results of the experiment show that this method can reduce the drift error and improve the precision of gyro effectively.