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Inertial microsystem output error modeling method

An error modeling and micro-system technology, applied in design optimization/simulation, calculation, sustainable transportation, etc., can solve problems such as system errors, achieve the effect of improving accuracy, enriching methods and means, and strengthening engineering practical value

Pending Publication Date: 2022-08-05
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

For example, after temperature modeling error compensation is usually used at present, the system still has errors caused by non-temperature factors

Method used

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  • Inertial microsystem output error modeling method
  • Inertial microsystem output error modeling method
  • Inertial microsystem output error modeling method

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Experimental program
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Effect test

Embodiment

[0074] (1) The output error of the MEMS gyroscope takes the sampling data 6 minutes after the stable output, a total of 194 times, and each time has 72,000 data. The output error is obtained by calculating the mean value of the output minus the input value, and the output stability is obtained by calculating the standard deviation of the output. The correlation analysis between the static output error and the output stability of the inertial microsystem MEMS gyroscope was carried out, and the calculated correlation coefficient was 0.865;

[0075] (2) Take the threshold value as 0.7 and the correlation coefficient as 0.865, which is greater than the threshold value, and model the output error and output stability;

[0076] (3) Establish a polynomial initial model of the output error of the inertial instrument with respect to the output stability. Initial model selection first-order polynomial K 1 is the coefficient of the first-order term of the model, K 0 is the model con...

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Abstract

The invention provides an inertial microsystem output error modeling method, which comprises the following steps of: establishing a polynomial model about output stability of an output error on the basis of correlation characteristics between the output error and the output stability of an MEMS (Micro Electro Mechanical System) inertial instrument, identifying parameters of the model by adopting a least square method, and optimizing the model by adopting a model significance analysis method. And when the saliency of the model and the saliency of the model parameters meet theoretical value requirements, obtaining an output error model of the inertial microsystem. The method is different from a previous zero offset modeling method based on factors such as temperature, enriches methods and means of system error modeling, has high engineering practical value, can be used for output error modeling and compensation of MEMS gyroscopes and MEMS accelerometers, and can remarkably improve the precision of an inertial microsystem.

Description

technical field [0001] The invention relates to an inertial microsystem output error modeling method, and belongs to the field of inertial microsystem performance improvement. Background technique [0002] Inertial microsystems mainly include two types of MEMS inertial instruments: MEMS gyroscopes and MEMS accelerometers. With the development of application requirements for miniaturization and low cost of various weapon platforms, MEMS inertial instruments are the core components to realize the navigation and guidance of various guided munitions and UAVs. At present, the micro inertial navigation system has become a bottleneck in the development of various micro and small aircraft. Error compensation for inertial microsystem is an important means to improve its accuracy. Therefore, many leading research institutions in MEMS technology have turned their research focus to the research on error modeling and error compensation methods of MEMS inertial devices, in order to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01C21/16G06F119/08
CPCG06F30/20G01C21/183G06F2119/08Y02T90/00
Inventor 王国栋王振凯田胜宋健民邢朝洋徐宇新
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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