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Method for dynamically estimating accelerometer resolution

An accelerometer and resolution technology, applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, measuring devices, etc., can solve the problem of no solution for the test of the accelerometer, and achieve the test High efficiency, convenient realization and strong anti-interference ability

Active Publication Date: 2013-11-13
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is no good solution for testing accelerometers with resolutions from 0.0001 μg to 0.5 μg

Method used

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  • Method for dynamically estimating accelerometer resolution
  • Method for dynamically estimating accelerometer resolution
  • Method for dynamically estimating accelerometer resolution

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Experimental program
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Embodiment Construction

[0025] The present invention proposes a method for dynamically estimating the resolution of the accelerometer, which adopts the method of further subdividing the acceleration of gravity (better than 5×10 -7 g or an equivalent angular change better than 0.1") to dynamically estimate the accelerometer resolution. Such as figure 1 As shown, its specific method steps are as follows:

[0026] (1) The accelerometer is mounted on the biaxial turntable used for calibrating the accelerometer to form a rigid whole. The two-axis turntable is one of general testing equipment for inertial devices, and mainly realizes the functions of two-axis position and speed.

[0027] figure 2 A schematic diagram of the accelerometer coordinate system and rotation relationship is given, and the accelerometer is installed according to image 3 installation method.

[0028] figure 2 In the definition figure, 1 is the coordinate system installed by the accelerometer as the geographic coordinate syst...

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Abstract

The invention discloses a method for dynamically estimating accelerometer resolution. The method comprises the following steps of: finishing the setting of an oblique rotation angle and the uniform-velocity rotation modulation through a double-shaft rotary table so as to realize subdivision of the acceleration of gravity; sampling and digitally storing the electric signal output by the accelerometer; and denoising to extract the signal in a digital filtration mode so as to obtain the output of the accelerometer and further determine the resolution thereof. The accelerometer tested by the method disclosed by the invention has high resolution and strong anti-jamming capability; and the method can be used as a test method for a high-resolution inertial measuring unit and an inertial navigation acceleration sensitive element, and is particularly suitable for testing an accelerometer with resolution being higher than 0.1mu g.

Description

technical field [0001] The invention relates to a method for dynamically estimating the resolution of an accelerometer, which dynamically estimates the resolution of the accelerometer by means of uniform-speed rotation modulation of a biaxial turntable, and belongs to the technical field of testing high-precision inertial components in aerospace. Background technique [0002] High-precision accelerometers and gyroscopes are important components of high-precision navigation, and are also important components of high-precision positioning and orientation systems and gravity measurement systems. The accelerometer is an important part of the inertial measurement unit (IMU). The angular velocity information output by the gyroscope and the acceleration information output by the accelerometer can be used to calculate the velocity, position, attitude and other information, and complete the navigation and positioning of the carrier. [0003] At present, gravity measurement is widely ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P21/00
Inventor 李海兵韩军海郭刚王晓东胡延祯马杰
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES