Method for calibrating optimum 24 positions of flexible gyroscope static drift error model

Abstract

The invention discloses and optimal twenty-four position calibration method for flexible gyroscope static drift error model. The flexible gyroscope is installed on the triaxial position rate table. The flexible gyroscope is connected with a data acquisition device. The data acquisition device is connected with a computer. The invention is designed by using disperse D-optimal design construction method. Twenty-four spatial position orientations are selected form the whole testing space to be as the gyro coordinate system orientation and to be tested. The optimal drift coefficient in the flexible gyroscope static drift error model means the flexible gyroscope static drift error model drift coefficient obtained by the flexible gyroscope optical twenty-four position testing data, which is most close to the true value of the drift coefficient. Namely, after the flexible gyroscope static drift error is compensated by the optimal drift coefficient obtained through calibration, the survey precision of the flexible gyroscope can be further improved.

Description

technical field The invention relates to a method for calibrating the optimal twenty-four positions of a static drift error model of a flexible gyroscope. Precisely defining the test position of the flexible gyroscope is an important experimental process in the field of flexible gyroscope testing and modeling, and it is also an important means to further improve the measurement accuracy of the flexible gyroscope. Background technique The flexible gyroscope is a dual-degree-of-freedom gyroscope, which is widely used in various navigation, guidance and control systems because of its advantages in accuracy, volume, cost and reliability. However, in practical applications, there are drift errors caused by various disturbance torques in the angular velocity measurement value of the flexible gyroscope. These drift errors are generally composed of static drift errors, dynamic drift errors and random drift errors. The static drift error is the main part of the drift error of the fl...

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Problems solved by technology

However, the above two methods have the following problems: ①. The traditional eight-position test method cannot accurately obtain the first-order drift coefficient in the static error model of the flexible gyroscope, so that the gyroscope after compensation for the static error of the flexible gyroscope with the estimated drift coefficient The measurement accuracy has not been significantly improved; ②, compared with the traditional eight-position test method, the first-order drift coefficient in the static error model of the flexible gyro estimated by the 24-position test method has been improved, but the estimation result is not optimal One-time item drift coefficient, and the calculation time in the test process is long, the calculation workload is large, and the test cost is high

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