Inertial platform swing dynamic precision testing method based on gravity vector measurement
An inertial platform and gravity vector technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as large method error, out-of-tolerance dynamic accuracy of inertial platform system swing, and easy to be affected by non-product factors, so as to achieve small measurement error and solve the problem of swing The effect of the out-of-tolerance problem
Active Publication Date: 2020-11-17
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology
[0005] The technology of the present invention solves the problem: to overcome the shortcomings of the existing evaluation method such as large error and being easily affected by non-product factors, a method for testing the dynamic accuracy of inertial platform swing based on gravity vector measurement is proposed to solve the problem of inertial platform system swing dynamics The problem of long-term out-of-tolerance accuracy
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[0062] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0063] The invention proposes a method for measuring the dynamic accuracy of inertial platform rocking based on gravity vector measurement. The gravity vector is measured by the quartz accelerometer installed on the platform body, and the attitude change of the platform body is reflected by the projection angle of the gravity vector on the platform body; during the swing process, the platform body is stabilized in the inertial space, and through the swing process The displacement of the platform in the horizontal direction is calculated by the specific force output of the quartz accelerometer in the horizontal direction. At the same time, the value window is designed according to the measurement method error and the output characteristics of the quartz accelerometer, and the dynamic accuracy of the platform swing is obtained by calculating the ...
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An inertial platform swing dynamic precision testing method based on gravity vector measurement comprises the steps that a gravity vector is measured through a quartz accelerometer, and the posture change of a platform body is reflected through the projection angle of the gravity vector on the platform body; then in the swinging process, the inertial platform body is stabilized in an inertial space, drifting of the inertial platform in the horizontal direction is calculated through specific force output of the quartz accelerometer in the horizontal direction in the swinging process, and meanwhile a value window is designed according to errors of a measurement method and output characteristics of the quartz accelerometer, and finally, the dynamic and static difference of the inertial platform is calculated to obtain the inertial platform swing dynamic precision. Only two horizontal directions of the inertial platform can be measured under one attitude of the inertial platform body, anddrifting of an azimuth axis cannot be observed, so that inertial platform base transposition is realized through the position swing platform; herein, swing modes of a vertical state and a horizontal state of the inertial platform are sequentially designed, and the observation problem of the azimuth axis is solved; therefore, errors caused by various non-product factors are eliminated, and the swing performance of the inertial platform is evaluated accurately and efficiently.
Description
technical field [0001] The invention relates to a method for measuring dynamic accuracy of inertial platform swinging based on gravity vector measurement, and belongs to the technical field of inertial platform system testing methods. Background technique [0002] The inertial platform is a stable platform system that measures the attitude information and apparent acceleration of the carrier, and is composed of a gyroscope, a platform body, a frame system and a stabilization loop. The gyroscope installed on the platform is sensitive to the angular velocity of the platform relative to the inertial space, and is controlled by a stabilization loop to keep the platform stable in the inertial space. When the platform base performs periodic angular motion, the angular position of the platform body will contain dynamic errors. The purpose of the swing test is to evaluate the stable control performance of the platform system under the angular dynamic condition of three-axis swing. ...
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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 姜欢赵军虎张金云石涛包诗林
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES