Method for calibrating combined error coefficient of accelerometer under condition of reference uncertainty

Abstract

The invention discloses a method for calibrating a combined error coefficient of an accelerometer under the condition of reference uncertainty. The method comprises the following steps: rotating a double-shaft rotating mechanism by establishing a reference mathematic model to obtain an output value of an inert measuring system arranged on a rotary platform, wherein an initial pitch and roll angle error is used as a variable in an error equation of the inert measuring system, and estimating the initial pitch and roll angle error to obtain an accurate pitch and roll angle. In a conventional laboratory calibrating method, if the position of a rotary table changes and the rotary table is transferred to an external field for testing, methods such as metering are adopted for calibrating the rotary table again, time and labor are wasted, and the rapid calibration under the maneuvering condition is not facilitated. According to the method, by establishing mathematic accurate reference, the separating effectiveness of the error of the inert measuring system is ensured, so that a horizontal reference precision index meets the use requirement. Under the condition of the reference uncertainty, the combined error coefficient of the accelerometer can be calibrated, the calibration efficiency of the external field is improved, the precision of a calibrating coefficient is improved, and the combined error coefficient of the accelerator is accurately calibrated.

Description

technical field [0001] The invention relates to a method for calibrating error coefficients, in particular to a method for calibrating error coefficients of accelerometer combinations under uncertain reference conditions, which belongs to the calibration technology of strapdown inertial combinations and can be used for calibrating the occasion of accelerometer combinations in strapdown inertial combinations. Background technique [0002] The accelerometer is one of the basic measurement elements of the inertial navigation and inertial guidance system. It is installed inside the vehicle to measure the acceleration of the vehicle, and its acceleration and position can be obtained by integrating the acceleration. Therefore, the performance and accuracy of accelerometers directly affect the accuracy of navigation and guidance systems. When installed inside the vehicle, the measured value of the accelerometer includes not only the acceleration of the accelerometer shell moving wi...

AI Technical Summary

Problems solved by technology

In the laboratory, if the position of the turntable is changed, or the turntable is transferred to the field for testing, it is necessary to use measurement and other methods to calibrate the turntable, which is time-consuming and laborious

This calibration method can only calibrate the error coefficient of the accelerometer when the accurate horizontal reference and azimuth reference are obtained, which limits the calibration conditions and is not conducive to rapid calibration under maneuvering conditions

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