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Method for extracting carrier angular velocity from MEMS accelerometer combination

A technology of accelerometer and angular velocity, applied in the field of strapdown inertial measurement, which can solve the problems of low range and inability to guarantee measurement accuracy, etc.

Inactive Publication Date: 2019-12-17
TIANJIN NAVIGATION INSTR RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the accuracy of MEMS gyro can reach 0.01° / h, its range is usually not high, so the measurement accuracy cannot be guaranteed in a large range

Method used

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  • Method for extracting carrier angular velocity from MEMS accelerometer combination
  • Method for extracting carrier angular velocity from MEMS accelerometer combination
  • Method for extracting carrier angular velocity from MEMS accelerometer combination

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Embodiment Construction

[0079] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0080] A method for extracting carrier angular velocity from MEMS accelerometer combination, comprising the following steps:

[0081] Step 1. Describe the motion state of the rigid body in the coordinate system;

[0082] The concrete method of described step 1 is:

[0083] Such as figure 1 Shown, O R x R Y R Z R As the reference coordinate system, choose a point O on the rigid body, and establish a coordinate system OX fixedly connected to the rigid body with O as the origin b Y b Z b , O point is also called base point. Fixed coordinate system OX b Y b Z b The movement of represents the movement of the rigid body, and the position of point O and the fixed connection OX can be used b Y b Z b Relative frame of reference O R x R Y R Z R The orientation to describe the motion state of the rigid body.

[0084] Make translational coo...

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Abstract

The invention relates to a method for extracting a carrier angular velocity from an MEMS accelerometer combination. The method is characterized by comprising the steps of: step 1, describing a motionstate of a rigid body in a coordinate system; step 2, calculating a speed and acceleration of a mass point on the rigid body according to the motion state of the rigid body in the coordinate system determined in the step 1; step 3, calculating a specific force at the position of the mass point on the rigid body according to the speed and the acceleration of the mass point on the rigid body obtained in the step 2; step 4, mechanically arranging an accelerometer; and step 5, and solving an angular speed and angular acceleration of a carrier based on the mechanical arrangement of the accelerometer in the step 4. The method can enable the system to reduce cost, reduces the power consumption, prolongs the service life and improves the reliability; meanwhile, the size of the system can be greatly reduced by adopting the MEMS accelerometer, and the method is of great significance to miniaturization of an inertial navigation system.

Description

technical field [0001] The invention belongs to the technical field of strapdown inertial measurement, and relates to a method for using MEMS accelerometers in carrier angular velocity measurement, in particular to a method for extracting carrier angular velocity from MEMS accelerometer combinations. Background technique [0002] Traditional strapdown inertial measurement devices use gyroscopes to measure the angular motion of the carrier. Commonly used gyroscopes include laser gyroscopes, fiber optic gyroscopes, flexible gyroscopes, and liquid floating gyroscopes. These gyroscopes occupy a large proportion in the weight and volume of the system. Today, as more and more products are pursuing lightweight and miniaturization, it is of great significance to develop new measurement components or measurement methods. [0003] With the rapid development of integrated circuits and the improvement of processing technology, more and more micro inertial sensitive devices are used in v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/08
CPCG01P15/08G01P2015/0862
Inventor 王琳贾晨凯李巍
Owner TIANJIN NAVIGATION INSTR RES INST