Research On Inertial Critical Performance Detection Method And Analysis Technology

The calibration accuracy of INS directly affects the navigation accuracy of INS.With the development of modern science and technology,the precision requirements of various navigation and guidance technologies are getting higher and higher.However,due to the limitations of actual materials,manufacturing and processing technology,the existing inertial sensors are difficult to meet the accuracy requirements of the system.Therefore,under the condition of limited precision of inertial sensors,from the point of view of the system,it is necessary to evaluate and analyze the stability of inertial sensors.As the core single-machine of INS,the parameter stability of INS determines the whole system performance retention period.The primary power-on stability(the stability of continuous working hours after passing the test)and the successive power-on stability(the performance retention period after passing the test)directly affect the system standby time and other important indicators.Reactivity has a crucial impact.At present,the new generation of inertial measurement units,such as optical fiber inertial unit and laser inertial unit,have the characteristics of short start-up time,high resolution,simple structure,no moving parts and long service life.They have been widely used in inertial navigation system,especially in unmanned aerial vehicle and missile weapon system.Strengthening stability research is helpful to accurately grasp the quality of inertial unit.It is of great significance to change the performance regularity,prolong the standby time in high state and improve the performance retention ability of INS.The typical parameters of common inertial gyroscopes and accelerometers can be collected,and the parameter library is established.Aiming at the primary and successive electrification stability,the performance evaluation and analysis algorithm and the required conditions are studied,and a configurable and scalable matching model is established to realize a more versatile analysis system.For support.Focusing on the research of the changing law of the performance of IMU,the test data in factory,first inspection,annual inspection and use are collected,processed and analyzed.Analyzing and studying the stability of successive electrification(performance maintained for 6 months),focusing on the four parameters of gyro bias and scaling factor,accelerometer bias and scaling factor,and studying its stability change rule and maintenance ability.Gyroscope bias is mainly analyzed by range method;gyroscope scale factor,accelerometer bias,accelerometer scale factor are correlated with storage time.The correlation coefficient is obtained by fitting calculation,and the linear and non-linear changes are distinguished for analysis.The least square method is used to deal with the number with linear changes.According to this,the 3_index interpretation method is used to process the data with non-linear change.Analyzing and studying the one-time electrification stability(working time is 8 hours),comparing and analyzing the four kinds and 12 parameters of gyro and accelerometer,and getting the change rule.The performance analysis module of inertial navigation system is designed.Research performance data display mode,design performance analysis display module,design configurable performance analysis module according to inertia category,performance analysis method and performance parameter category,so that users can add,delete and modify the corresponding categories of inertia performance analysis which methods and parameters need to be used.The data interaction module is designed to realize the data interconnection and interoperability among the modules.