Inertial navigation precision compensation method of local polynomial model considering frequency domain characteristics

A technology of polynomial model and frequency domain characteristics, applied in the field of perturbed gravity calculation, can solve problems such as affecting accuracy, achieve the effect of ensuring correctness, suppressing the influence of grid errors, and improving model resolution
CN112683300APending Publication Date: 2021-04-20CHANGSHA UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGSHA UNIVERSITY
Publication Date
2021-04-20

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Abstract

The invention discloses an inertial navigation precision compensation method of a local polynomial model considering frequency domain characteristics; the method comprises the following steps: removing a low-frequency information model value of a disturbance gravity component of an observation point calculated on the basis of a global gravity field model from an observation value of the disturbance gravity component to obtain a residual value of the disturbance gravity component of the observation point; applying a spatial domain local polynomial grid algorithm based on the residual value of the disturbance gravity component of the observation point, and calculating the residual value of the disturbance gravity component of the to-be-estimated point; 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 domain local polynomial technology is utilized to improve the model resolution.
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Description

technical field

[0001] The invention relates to the technical field of disturbance gravity calculation, in particular to an inertial navigation precision compensation method of a local polynomial model considering frequency domain characteristics. 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 local polynomial grid technology to obtain the disturbed gravity component only uses the spatial position information between the estimated point and the observed point, which leads to the gridding error 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 thi...

Claims

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