Method for calibrating double orthogonal high-precision accelerometers

A technology of accelerometer and calibration method, which is applied in speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measurement equipment, and measurement devices, etc., which can solve the problem of unsatisfactory acceleration memory model and inaccurate calibration of error parameters, etc. problem, to achieve the effect of improving the accuracy of the gravity field test and eliminating the influence of the calibration of the accelerometer error coefficient

Inactive Publication Date: 2010-10-06
HARBIN INST OF TECH
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Problems solved by technology

[0015] In order to solve the problem of inaccurate calibration of error parameters and unsatisfactory acceleration memory model obtained due to the existence

Method used

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  • Method for calibrating double orthogonal high-precision accelerometers
  • Method for calibrating double orthogonal high-precision accelerometers
  • Method for calibrating double orthogonal high-precision accelerometers

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specific Embodiment approach 1

[0034] Specific Embodiment 1: The process of the calibration method of the orthogonal dual high-precision accelerometer described in this embodiment is as follows:

[0035] Step 1. Install the A accelerometer 2a and the B accelerometer 2b on the main shaft of the grating indexing head 101 in a manner that the input axes are perpendicular to each other by using a hexahedron mounting fixture 104, as figure 1 shown;

[0036] Step 2. Install polyhedral prism 103 on the main shaft of grating indexing head 101, and make this polyhedral prism 103 have a plurality of faces to be approximately parallel with a plurality of sides on the installation fixture 104 respectively;

[0037] Step 3. Rotate the grating indexing head 101 to perform a multi-position rollover test, and record the sampling output values ​​of the A accelerometer 2a and the B accelerometer 2b at each angular position during the test with ,in with The subscript n is the angular position of the corresponding grat...

specific Embodiment approach 2

[0109] Embodiment 2: This embodiment is a further limitation on the calibration method of the orthogonal dual high-precision accelerometer described in Embodiment 1. During the multi-position rollover test described in Step 3, the method of using the photoelectric self-calibration instrument (108) and the polyhedral prism (103) to correct the angle of the 180° position according to the 0° position is as follows:

[0110] When grating dividing head 1 is positioned at 0 ° position, record the reading of photoelectric self-calibration value instrument 108,

[0111] Then, when the grating indexing head 1 rotates to the 180° position, the reading of the photoelectric self-calibration instrument 108 is the same as that at the 0° position by fine-tuning the rotation angle of the grating indexing head 1, and the grating indexing head is calibrated.

specific Embodiment approach 3

[0112] Embodiment 3: This embodiment is a further limitation on the calibration method of the orthogonal dual high-precision accelerometer described in Embodiment 1. During the multi-position rollover test described in Step 3, the method of using the photoelectric self-calibration instrument (108) and the polyhedral prism (103) to correct the angle of the 270° position according to the 90° position is as follows:

[0113] When the grating dividing head 1 is positioned at 90 ° position, record the reading of photoelectric self-calibration value instrument 108,

[0114] Then, when the grating indexing head 1 is rotated to the 270° position, the reading of the photoelectric self-calibration instrument 108 is the same as that at the 90° position by fine-tuning the rotation angle of the grating indexing head 1, and the grating indexing head is calibrated.

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Abstract

The invention discloses a method for calibrating double orthogonal high-precision accelerometers, and relates to the improved method for identifying an error model of the double orthogonal high-precision accelerometers, and aims to solve the problem of inaccurate accelerometer error parameter calibration caused by an angular error. The method comprises the following steps of: sleeving a polyhedral prism onto a main shaft of a grating dividing head, fixing two miniature high-precision accelerometers to be measured onto a mounting fixture in a way that the two accelerometers are vertical to each other, and fixing the mounting fixture onto the main shaft of the grating dividing head; making a light beam passing through a photoelectric auto-collimator irradiate the polyhedral prism, precisely determining zero offset terms in coefficients of the model of the accelerometers with readings at the positions of between 0 and 180 degrees, and for the positions of between 90 and 270 degrees, adopting the same method; and then obtaining each parameter of the error model by an orthogonal double-accelerometer method to finish the calibration. The method has the advantage of improving the testing precision of a gravitational field, and is particularly suitable for occasions of testing the accelerometers with precision higher than 1 mu g.

Description

technical field [0001] The invention belongs to the technical field of testing high-precision inertial components in aerospace inertial navigation, in particular to a method for identifying small accelerometer error model parameters. Background technique [0002] The core components of inertial navigation are accelerometers and gyroscopes, and the measurement information of the sensors can be used to calculate the navigation parameters of the carrier, such as attitude, speed, and position. So their accuracy directly affects the accuracy of navigation and guidance systems. However, limited by the current level of processing technology and technology, the cost of developing a high-precision accelerometer is very expensive, and there is little room for improvement in accuracy. Therefore, it is necessary to start with testing technology and identification methods, test the accelerometer and build an error model, calibrate the parameters of the error coefficient, and compensate ...

Claims

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Application Information

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IPC IPC(8): G01P21/00
Inventor 姜岩松刘雨苏宝库杨毓邹宇常舒宇
Owner HARBIN INST OF TECH
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