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FBG-strain rosette-based recursive transfer alignment method

A technology for transferring alignment and strain roses, which is applied in the field of inertial navigation to achieve the effect of improving accuracy and reliability

Pending Publication Date: 2021-11-30
SOUTHEAST UNIV
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Problems solved by technology

This design solves the accuracy problem of the existing FBG measurement of flexible wing one-dimensional strain assisted inertial measurement, and at the same time considers the motion relationship between the sub-nodes of the wing and the deformation continuity of the wing, and finally improves the distributed transfer alignment. precision

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  • FBG-strain rosette-based recursive transfer alignment method
  • FBG-strain rosette-based recursive transfer alignment method
  • FBG-strain rosette-based recursive transfer alignment method

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Embodiment Construction

[0059] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0060] Such as figure 1 and figure 2 As shown, a kind of recursive transfer alignment method based on FBG strain rosette that the present invention proposes, uses FBG strain rosette to simulate the three-dimensional deflection of the wing, and establishes the error angle and lever arm model on this basis; Angle and lever arm are used as state variables, and the deflection angle measured by the FBG rosette is used to correct the attitude error measurement. The attitude + speed matching method is used to establish the master-sub-transfer alignment model; and then the motion information relationship between the sub-nodes is Derivation, combined with the derived master-...

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Abstract

The invention discloses an FBG-strain rosette-based recursive transfer alignment method, and aims to solve the problem that the flexible deformation of a wing is difficult to accurately model. The distributed transfer alignment method is divided into three parts: 1, wing deformation measurement; 2, the relationship between the child nodes; and 3, continuity aiming at wing deformation. Compared with an existing distributed transfer alignment method, an FBG strain rosette is used for measuring three-dimensional deformation to assist in establishing a main-sub transfer alignment model, the motion parameter relation between sub-nodes is analyzed, a sub-node n (n being larger than 1) carries out transfer alignment according to main node information, deformation information measured by the FBG strain rosette and information of an (n-1) th sub-node. And finally, fitting and correcting of the position information of each child node are carried out. The method not only solves the precision problem of the existing FBG measurement flexible wing one-dimensional strain auxiliary inertia measurement, but also considers the motion relation between wing sub-nodes and wing deformation continuity, and finally improves the precision of distributed transfer alignment.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation, and relates to the process of calibrating multiple low-precision sub-inertial navigation systems by a high-precision main inertial navigation system, and in particular to a recursive transfer alignment method based on FBG (fiber optic grating sensor) rosettes . Background technique [0002] At this stage, the array load technology is gradually applied to the aerial earth observation system. The maneuvering of the observation platform will cause serious errors in the load, so the pose measurement system is required to provide it with high-precision motion information. [0003] The distributed pose measurement system includes a high-precision main IMU in the cabin and multiple sub-IMUs fixedly connected to the mission load. The high-precision motion information of the main IMU is used to transfer and align multiple sub-IMUs, thereby obtaining high-precision motion information of each po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01B11/16
CPCG01C25/005G01B11/165Y02T90/00
Inventor 陈熙源朱敏马振方琳
Owner SOUTHEAST UNIV
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