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Method for inverting earth gravity field of residual inter-star velocity

A technology of gravity and velocity of the earth, which is applied in astronomy, geodynamics, space geodesy, involving the field of satellite gravity, and can solve problems such as complex calculation process and rapid accumulation of dynamic models

Inactive Publication Date: 2013-05-01
INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI
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  • Application Information

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Problems solved by technology

However, the main disadvantage of the dynamic method is that with the increase of the arc length of the satellite orbit, the error of the dynamic model will accumulate rapidly, and the calculation process is more complicated, which requires the support of a high-performance parallel computer

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  • Method for inverting earth gravity field of residual inter-star velocity
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  • Method for inverting earth gravity field of residual inter-star velocity

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Embodiment 1

[0072] The method of retrieving the earth's gravity field based on the principle of residual interstellar velocity includes the following steps:

[0073] Step 1: Satellite observation data collection

[0074] (1) Obtain the inter-satellite velocity through the space-borne laser interferometric rangefinder Obtain the orbital position of the double satellite through the satellite-borne GPS receiver (r 1 ,r 2 ) and the orbital velocity of the binary star The non-conservative force (f 1 ,f 2 ).

[0075] (2) if figure 1 As shown, using the 9th-order Runge-Kutta linear single-step method and the 12th-order Adams-Cowell linear multi-step numerical simulation formula to obtain the binary star reference orbit position and binary reference orbital velocity

[0076] (3) Reference inter-satellite velocity by reference orbital velocity calculated in, represents the relative reference orbital velocity vector, Indicates the reference unit vector of the first reference ...

Embodiment 2

[0127] Since satellite observations are not independent of each other, they have obvious correlation. Therefore, when retrieving the next-generation GRACE Follow-On Earth's gravity field, correlated colored noise is introduced into the satellite observations.

[0128] The method of retrieving the earth's gravity field based on the principle of residual interstellar velocity includes the following steps:

[0129] Step 1: Satellite observation data collection

[0130] (1) Obtain the inter-satellite velocity through the space-borne laser interferometric rangefinder Obtain the orbital position of the double satellite through the satellite-borne GPS receiver (r 1 ,r 2 ) and the orbital velocity of the binary star The non-conservative force (f 1 ,f 2 ).

[0131] (2) if figure 1 As shown, using the 9th-order Runge-Kutta linear single-step method and the 12th-order Adams-Cowell linear multi-step numerical simulation formula to obtain the binary star reference orbit position ...

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Abstract

The invention relates to a method for inverting an earth gravity field of a residual inter-star velocity, and the method is characterized in that high-precision residual inter-star velocity observation quantity of a satellite-borne laser interference range finder is introduced into a sight component of a residual track velocity differential vector of a global positioning system (GPS) receiving machine to establish a novel residual inter-star velocity observation equation so as to precisely and rapidly invert the earth gravity field; the precision for calculating the earth gravity field is high, the satellite gravity inversion velocity is fast, requirement on the computer performance is low, the method is sensitive to high-frequency signals in the gravity field, and easiness for analyzing the satellite gravity inversion error is realized; and the residual inter-star velocity method is a key technology for establishing a high-precision and high spatial-resolution global gravity field model.

Description

1. Technical field [0001] The present invention relates to intersecting technical fields such as satellite gravity, space geodesy, geodynamics, and astronautics, and in particular relates to a high-precision residual intersatellite velocity observation (measuring precision 10 -9 m / s) Introduce the line-of-sight component of the residual orbital velocity difference vector of the GPS receiver to establish a new residual intersatellite velocity observation equation, and then accurately and quickly establish a high-order earth gravity field model. 2. Background technology [0002] The earth's gravitational field and its time variation reflect the spatial distribution, movement and change of the earth's surface and interior materials, and at the same time determine the fluctuation and change of the geoid. Therefore, to determine the fine structure of the Earth's gravitational field and its time-varying is not only the demand of geodesy, geophysics, geodynamics, oceanography, spac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/00
Inventor 不公告发明人
Owner INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI
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