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

A technology of accelerometer and combined error, applied in the direction of measuring devices, instruments, etc., can solve the problems of time-consuming and laborious, limited calibration conditions, unfavorable rapid calibration, etc.

Active Publication Date: 2015-04-08
BEIJING INST OF AEROSPACE CONTROL DEVICES
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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

Method used

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

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Embodiment Construction

[0092] Since the accelerometer combination calibration requires high-precision horizontal and azimuth references, using this method can reduce the accuracy requirements of the references when the inertial measurement system is calibrated. The test process flow chart of the inventive method is as figure 1 As shown, the data processing flow chart is as follows figure 2 As shown, the specific steps are as follows:

[0093] 1. Install the strapdown inertia combination on the double-axis rotating mechanism, such as image 3 shown. Adjust the swivel mechanism so that the strapdown inertial combination rests in 16 different positions. The installation datum of the biaxial rotary mechanism does not need to be known precisely. And the 16 positions of the strapdown inertial measurement system are:

[0094] Position 1: Adjust the rotation mechanism so that the strapdown inertial combination is still at an arbitrary position, and record the rotation angle α(1) of the inner frame and...

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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...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 魏宗康黄超刘璠
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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