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Gravity-related time reciprocal determination method

A time-related, method-determining technique, applied in the direction of measuring gravitational fields, measuring devices, instruments, etc.

Active Publication Date: 2021-01-15
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

So far, the method of determining the reciprocal of gravity-related time related to the filter cut-off frequency has not been reported publicly in the literature

Method used

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  • Gravity-related time reciprocal determination method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with specific embodiments.

[0046] This embodiment discloses a method for determining the reciprocal of gravity-related time, comprising the following steps:

[0047] S1. The gravity measurement data of an engine base, the root mean square error of the gravity sensor σ f =5.0×10 -5 m / s 2 , GNSS height error root mean square σ h =0.05m, prior gravity root mean square σ g =0.001m / s 2 and the gravity filter cutoff frequency ω c = π / 50.

[0048] S2. Determination of the reciprocal of the gravity-related time of the gravity anomaly of the m-order Gaussian Markov model. According to S1, a certain engine base gravity measurement data, use the following formula (15) to calculate the reciprocal β of gravity-related time.

[0049]

[0050] in,

[0051] According to S1, the gravity measurement data of a certain engine base, using the simplified formula (16), calculate the reciprocal β of gravity-re...

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Abstract

The invention discloses a gravity-related time reciprocal determination method, in gravity measurement data processing, gravity anomaly is regarded as a stable random process of a time domain, a second-order, third-order or m-order Gaussian Markov model is used to describe the stable random process, and the gravity correlation time reciprocal is an important parameter of the gravity anomaly model;according to a gravity sensor error mean square root, a global navigation satellite system height error mean square root, a priori gravity mean square root and a gravity filtering cut-off frequency in a movable engine base gravity measurement process, a gravity correlation time reciprocal of a second-order, third-order or m-order Gaussian Markov model are determined; according to the gravity correlation time reciprocal determination method provided by the invention, a positive and negative Kalman filter in the gravity measurement data processing of the movable engine base can be adjusted, anda gravity abnormal value with high precision and high wavelength resolution can be obtained.

Description

technical field [0001] The invention relates to a method for determining the reciprocal of gravity-related time, and belongs to the technical field of gravity measurement data processing of engine bases. Background technique [0002] The earth's gravity field information plays a very important role in the exploration of mineral resources, the development of earth science and military science, and the construction of national defense. Today's rapid measurement method for the earth's gravity field is the gravity measurement of the moving base, and the data obtained by the gravity measurement of the moving base The high-precision and high-resolution gravity field is obtained through the gravimetric data processing method. In the gravimetric data processing method, the filter design plays a pivotal role. At present, the commonly used gravity data filters are finite impulse response low-pass filter and infinite impulse response low-pass filter, and the positive and negative Kalm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/06
CPCG01V7/06G01V7/00G01V7/16
Inventor 蔡体菁
Owner SOUTHEAST UNIV
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