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Inertial instrument error correction method based on airspace bilinear grid function

An inertial instrument and error correction technology, applied in the direction of instruments, measuring devices, etc., can solve problems affecting accuracy, disturbing gravity gridding errors, etc.

Pending Publication Date: 2021-04-20
CHANGSHA UNIVERSITY
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Problems solved by technology

The traditional airspace bilinear grid technology to obtain the disturbed gravity component only uses the spatial position information between the estimated point and the observed point, resulting in gridding errors caused by the disturbed gravity during the interpolation process, thus affecting the accuracy

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  • Inertial instrument error correction method based on airspace bilinear grid function
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  • Inertial instrument error correction method based on airspace bilinear grid function

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Embodiment Construction

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] refer to figure 1 , an embodiment of the present invention provides a kind of inertial instrument error correction method based on airspace bilinear grid function, comprises the following steps:

[0022] S100. Remove the low-frequency information model value of the three components of the disturbed gravity at the observation point calculated based on the global gravity field model from the observed values ​​of the three components of the disturbed gravity, to obtain a residual value of the three components of the disturbed gravity...

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Abstract

The invention discloses an inertial instrument error correction method based on an airspace bilinear grid function, and the method comprises the steps: removing a low-frequency information model value, calculated based on a global gravity field model, of a disturbance gravity component of an observation point from an observation value of the disturbance gravity component, and obtaining a residual value of the disturbance gravity component of the observation point; on the basis of the residual value of the disturbance gravity component of the observation point, calculating the residual value of the disturbance gravity component of the to-be-estimated point by applying an airspace bilinear grid algorithm; and combining the residual value of the disturbance gravity component of the to-be-estimated point with the low-frequency information model value of the disturbance gravity component of the to-be-estimated point calculated based on the global gravity field model to obtain a disturbance gravity component calculated value of the to-be-estimated point. According to the method, the low-frequency information of the disturbance gravity component is strictly correct in principle, the spectral characteristics of the disturbance gravity component are considered to suppress the grid error influence in a medium-long wave band, and the spatial bilinear technology is utilized to improve the model resolution.

Description

technical field [0001] The invention relates to the technical field of disturbance gravity calculation, in particular to an inertial instrument error correction method based on a bilinear grid function in airspace. Background technique [0002] Disturbed gravity is the essential basic information for correcting the mechanical arrangement of the inertial navigation system, and is a key element for improving the navigation and positioning accuracy of the inertial navigation system. The traditional airspace bilinear grid technology to obtain the disturbed gravity component only uses the spatial position information between the estimated point and the observed point, resulting in gridding errors caused by the disturbed gravity during the interpolation process, thus affecting the accuracy. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes an in...

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Application Information

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IPC IPC(8): G01C25/00
Inventor 冯璐吴鹏聂俊伟黄雅静梁伟朱小文方新怡周博
Owner CHANGSHA UNIVERSITY
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