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Method and system for determining earth gravitational field recovered from satellite gravity gradient full tensor

A technique for determining gravity gradients and methods, applied in the field of physical geodesy, can solve problems such as inability to make full use of observation information and inability to obtain a more accurate model of the earth's gravity field

Active Publication Date: 2018-11-23
中国人民解放军61540部队
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing surface spherical function integral It can only be used to establish the expression of partial disturbance gravitational gradient components, and cannot make full use of all observation information, and cannot obtain a more accurate model of the earth's gravity field

Method used

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  • Method and system for determining earth gravitational field recovered from satellite gravity gradient full tensor
  • Method and system for determining earth gravitational field recovered from satellite gravity gradient full tensor
  • Method and system for determining earth gravitational field recovered from satellite gravity gradient full tensor

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Embodiment 1

[0050] figure 1 It is a flow chart of the method for determining the full tensor of the satellite gravity gradient to recover the earth's gravity field provided by Embodiment 1 of the present invention. Such as figure 1 As shown, a method for determining the full tensor of the satellite gravity gradient to restore the earth's gravitational field includes:

[0051] Step 11: Obtain satellite gravity gradient measurement data.

[0052] Step 12: Perform preprocessing on the satellite gravity gradient measurement data to obtain along-orbit disturbance gravity gradient data. The preprocessing specifically includes: gross error elimination processing, coordinate transformation processing, and normal field correction processing.

[0053] Step 13: Perform grid processing on the perturbation gravitational gradient data along the track to obtain the full tensor of the perturbation gravitational gradient of grid points.

[0054] Specifically, the step 13: performing grid processing on the grav...

Embodiment 2

[0080] figure 2 This is a structural block diagram of the system for determining the full tensor of the satellite gravity gradient to restore the earth's gravity field provided by the second embodiment of the present invention. Such as figure 2 As shown, a system for determining the full tensor of the satellite gravity gradient to restore the earth's gravitational field includes:

[0081] The measurement data acquisition module 21 is used to acquire satellite gravity gradient measurement data;

[0082] The preprocessing module 22 is used to preprocess the satellite gravity gradient measurement data to obtain the gravitational gradient data of the disturbance along the orbit;

[0083] The grid processing module 23 is configured to perform grid processing on the gravitational gradient data of the disturbance along the track to obtain the full tensor of the grid point value disturbance gravitational gradient;

[0084] The integration processing module 24 is configured to perform integr...

Embodiment 3

[0087] Such as image 3 As shown, the satellite gravity gradient measurement data is preprocessed and gridded to obtain grid point value perturbation gravitational gradient data, which is integrated to obtain grid mean perturbation gravitational gradient data. A grid needs to be established for gravity field inversion. The full tensor expression of the mean perturbation gravitational gradient, and the recursive algorithm of two types of new surface sphere function integral expressions plays a key role in this process. Through this algorithm, the full tensor expression of the grid mean perturbation gravitational gradient can be realized The establishment of, combined with the observation data to carry out the inversion of the gravity field, and finally obtain a more accurate earth's gravity field model.

[0088] The inversion of the full tensor Earth's gravity field uses all disturbing gravitational gradient data (T x′x′ , T y′y′ , T z′z′ , T x′y′ , T x′z′ And T y′z′ ), the f...

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Abstract

The invention discloses a method and system for determining an earth gravitational field recovered from a satellite gravity gradient full tensor. The method includes: preprocessing satellite gravity gradient measured data to obtain the in-situ disturbance gravitational gradient data; performing gridding treatment on the in-situ disturbance gravitational gradient data to obtain the grid point valuedisturbance gravitational gradient data, and establishing a full tensor expression thereof; performing integral processing on the grid point value disturbance gravitational gradient data to obtain grid mean value disturbance gravitational gradient data, and establishing a full tensor expression thereof; recovering an earth gravitational field based on the grid mean value disturbance gravitationalgradient data and the full tensor expression thereof. The method and system provided by the invention can fully excavate the gravitational field information contained in various types of observationdata and fully utilize various types of observation information to recover the earth gravitational field to the utmost extent, thereby obtaining an accurate earth gravitational field model and providing a technical support for grid mean value disturbance gravitational gradient full tensor data joint inversion.

Description

Technical field [0001] The present invention relates to the field of physical geodesy, in particular to a method and system for determining the full tensor of satellite gravity gradient to restore the earth's gravity field. Background technique [0002] In the field of contemporary physical geodesy, the construction of gravity field models is still a research hotspot. The spherical harmonic function plays a pivotal role in the construction of the gravity field model. Each element in the earth's gravity field can be expressed in the form of a series of spherical harmonic functions, so as to establish the spherical harmonic coefficients ( Or ellipsoid harmonic coefficient), the normal equation is established through the gravity field inversion technology, and the gravity field model is obtained by solving. [0003] Satellite gravity gradient measurement data can be used to construct a gravity field model. Since the normal equations formed by grid data have a block diagonal structure...

Claims

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Application Information

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IPC IPC(8): G01V7/02G01V7/00
Inventor 肖云王云鹏宋勇吴凌根
Owner 中国人民解放军61540部队
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