A triaxial quartz flexible accelerometer assembly and its measurement method

Abstract

The present invention is a triaxial quartz flexible accelerometer assembly, which includes a measurement part and a data conversion part; the measurement part includes an installation platform and three quartz flexible accelerometers; the installation platform is in the shape of a triangular pyramid, and the three quartz flexible accelerometers They are respectively fixed on the three sides of the installation platform, and the bottom surface of the installation platform is set horizontally; the axes formed by the three quartz flexible accelerometers are perpendicular to each other, and the included angle between the axes of the three quartz flexible accelerometers along the horizontal plane Divide equally; an acceleration measurement method, step 1, define the sensitive axes of the three quartz flexible accelerometers as U, V, and W coordinate axes respectively, and measure the acceleration in the UVW coordinate system; step 2, pass the data conversion component Convert the acceleration in the UVW coordinate system to the acceleration in the XYZ coordinate system, and output the acceleration digital signals of the three axes of X, Y, and Z in the XYZ coordinate system. The structure is simple, and no special design is required for the quartz flexible accelerometer.

Description

technical field [0001] The invention relates to the field of inertial measurement, in particular to a triaxial quartz flexible accelerometer assembly and a measurement method thereof. Background technique [0002] The Inertial Measurement Unit (IMU) measures the three axial angular velocities and accelerations of the carrier in the inertial reference system, and obtains the carrier's speed, yaw angle and other values ​​in the navigation coordinate system by integrating and solving the time. Position information is the core information source of inertial navigation system. In addition, inertial measurement units have also been widely used in various fields of national defense and people's livelihood, such as precise guidance of long-range weapons, satellite attitude control, petroleum geological exploration, and vibration measurement of railway track inspection vehicles, with extremely high military and social benefits. [0003] As an important instrument of the IMU, the per...

AI Technical Summary

Problems solved by technology

This continuous external stress will accelerate the service life of the aging quartz flexible accelerometer, and amplify the measurement error caused by the process error of the three-axis quartz flexible accelerometer. Therefore, in some precision measurement fields, it is necessary to separately adjust the z-axis Accelerometers are specially designed

In addition, when the inertial navigation system uses the acceleration components of the three axes of XYZ, it needs to eliminate the influence of real-time gravitational acceleration in advance, and the gravitational acceleration will change with the ground height, latitude and the distribution of nearby mineral deposits, etc., thus improving the inertial navigation. system complexity

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