Spatial hierarchical grid disturbance gravity field model building and disturbance gravity quick determination method

Abstract

The invention discloses a spatial hierarchical grid disturbance gravity field model building and disturbance gravity quick determination method which overcomes the defect that in the prior art, a disturbance gravity field still needs to be further studied. The method comprises the following steps that firstly, height level division is performed; in other words, external space is divided into a plurality of sections according to gravity variation characteristics of global outer disturbance; secondly, grid cell approach and grid division criteria are formulated; in other words, approach is performed through grid units based on wide-area polynomials different sections respectively, and accuracy is analyzed; thirdly, the criteria are utilized for disturbance gravity model building; fourthly, disturbance gravity is calculated in real time through a model, the application requirement of an aircraft in the high-speed flight process is combined, and therefore the disturbance gravity can be calculated efficiently in a high-accuracy mode. Compared with the prior art, the calculated amount is small, calculation can be achieved without a specially advanced computer, multiple types of gravity measurement data are not needed, and approach accuracy is high.

Description

Technical field [0001] The invention relates to the construction of a spatial layered grid disturbed gravitational model, in particular to a method for the construction of a spatially layered grid disturbed gravitational field model and a method for quickly determining the disturbed gravity. Background technique [0002] Disturbing gravity, as the research focus of the earth's gravitational field, has very important theoretical and application value. So far, no one has ever constructed a layered grid model of disturbed gravitational field, and no one has studied the method of layered grid division of disturbed gravitational field. [0003] For the modeling of disturbing gravitational field, domestic and foreign mainly focus on the following methods: potential coefficient model, virtual point mass model, Stokes integral, single-layer density method, spherical harmonic function commutation method, gradient method, upward continuation method and function approximation, etc. method. ...

AI Technical Summary

Problems solved by technology

[0006] Second, more types of gravity measurement data are required

Among them, the gradient method needs to measure enough astronomical, terrestrial and gravity data in the calculation area, so this method is only suitable for calculating the disturbance gravity in local areas; the upward continuation method also needs to use the vertical line deviation value of the surface continuation position

[0007] 3. Only local disturbance gravitational force can be calculated

Among them, when the virtual point mass method is used to construct the global model, it is necessary to perform calculations on super-large-order matrices, especially the inversion calculation. Generally, computers cannot undertake such a heavy task.

[0008] Fourth, the approximation accuracy is not high

This method can only use the elevation component in the coordinate information, so it cannot accurately approximate the three-dimensional disturbance gravitational field

[0009] 5. The flexibility is poor or the trajectory function needs to be known in advance

Among them, the BP-neural network needs to use the disturbed gravitational value of the points near the given orbit to carry out repeated learning and training, which has poor general applicability and takes a long time to train; the finite element analysis method can be used to approximate the The coordinate information of the three components can be used for the disturbed gravitational field in different regions, and the approximation accuracy can reach a high level, but in general, this method needs to know the trajectory function in advance

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