Method for using satellite-borne accelerometer to indirectly measure micro-vibration physical quantity parameter

Abstract

The invention discloses a method for using a using a satellite-borne accelerometer to indirectly measure a micro-vibration physical quantity parameter, and the method is used for performing micro-vibration physical quantity parameter measurement on a detected object. The method for using the satellite-borne accelerometer to indirectly measure the micro-vibration physical quantity parameter comprises steps of choosing an installation plane on the detected object to determine a coordinate system, arranging accelerometers on a p point and a q point on the installation plane, wherein the sensitive axes of the accelerometers are perpendicular to a connection line between the p point and the q point and are in a same plane, transmitting acceleration in a form of digital signals into the ground, wherein the acceleration is sensed by two accelerometers, obtaining two sets of micro-vibration linear acceleration time domain data after ground processing, respectively performing FFT and calculating amplitude spectrums of linear speed and linear displacement, respectively performing IFFT on amplitude spectrums of the linear speed and the linear displacement to obtain time domain data of the linear speed and the linear displacement, solving relative angular acceleration time domain data which is obtained by a detected object revolving around a rotation axis line which is defined by the p point and the q point, performing FFT and calculating the amplitude spectrums of the angular speed and the angular displacement and respectively performing IFFT to obtain time domain data of the angular speed and the angular displacement.

Description

technical field [0001] The invention belongs to the technical field of non-electricity measurement and testing, and in particular relates to a method for indirectly measuring micro-vibration physical quantity parameters by using an on-board accelerometer. Background technique [0002] Satellite space resources are strictly limited, and it is the basic principle of engineering design to achieve mission goals with as few resources as possible. Using a high-precision accelerometer to measure the micro-vibration of a spacecraft is a common technical means. Obtaining the velocity and displacement of the micro-vibration is usually obtained by integrating the acceleration once and twice, which leads to an integral constant error, such as image 3 , Figure 4 and Figure 5 As shown, there is obvious image distortion; similarly, time-domain angular velocity and angular displacement can also be obtained by performing one-time integration and two-time integration on the time-domain an...

AI Technical Summary

Problems solved by technology

Using a high-precision accelerometer to measure the micro-vibration of a spacecraft is a common technical means. Obtaining the velocity and displacement of the micro-vibration is usually obtained by integrating the acceleration once and twice, which leads to an integral constant error, such as image 3 , Figure 4 and Figure 5 As shown, there is obvious image distortion; similarly, time-domain angular velocity and angular displacement can also be obtained by integrating the time-domain angular acceleration once and twice, and the existing problems are the same

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