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Error Correction Method of Strapdown Gravity Meter Based on Correlation Analysis and Empirical Mode Decomposition

A technology of correlation analysis and empirical model, applied in the field of error correction of strapdown airborne gravimeter, can solve problems such as dynamic errors and achieve the effect of improving measurement accuracy

Active Publication Date: 2018-09-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] Aiming at the problem that the strapdown aviation gravimeter is affected by the external airflow and the dynamic characteristics of the carrier, and then generates related dynamic errors, the present invention proposes a strapdown gravimeter error correction method based on correlation analysis and empirical model decomposition, and then Reduce the impact of dynamics on airborne gravity measurement and improve the accuracy of airborne gravity measurement

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  • Error Correction Method of Strapdown Gravity Meter Based on Correlation Analysis and Empirical Mode Decomposition
  • Error Correction Method of Strapdown Gravity Meter Based on Correlation Analysis and Empirical Mode Decomposition
  • Error Correction Method of Strapdown Gravity Meter Based on Correlation Analysis and Empirical Mode Decomposition

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and certain actual aviation gravimetric measurement experiment, the method among the present invention is described in further detail, and the organization implementation situation of experiment is as table 1, comprises 6 repeated measuring lines (hereinafter collectively referred to as flight experiment) in this flight experiment, Among them, the 5th and 6th flight measurement lines are undulating flight to verify the dynamic error, and the altitude change of the flight experiment is as follows: figure 1 shown.

[0032] Table 1

[0033]

[0034] Step 1: Perform gravity calculation on the gravity data obtained from the actual measurement and obtain the measurement result at a resolution of 3km after low-pass filtering;

[0035] The model for strapdown gravimetry is

[0036]

[0037] in, and is the acceleration and velocity relative to the earth obtained by GPS measurement, f b is the specific force information ...

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Abstract

The invention belongs to the gravity measurement field and discloses a strapdown gravimeter error correction method based on correlation analysis and empirical mode decomposition. According to the method, an equivalent band-pass filter is utilized to research gravimeter error within corresponding frequency bands, so that the accuracy of the method can be improved; empirical mode decomposition is adopted to obtain the intrinsic mode component of a measurement result; error separation is performed by using the correlation of the intrinsic mode component and a pseudo specific force; and modal aliasing in the empirical mode decomposition is avoided through using an iterative method. With the method of the invention adopted, the accuracy of strapdown airborne gravity measurement can be improved under a condition that the resolution of the strapdown airborne gravity measurement is not affected. The method is of great significance for the improvement of the accuracy of a strapdown gravimeter.

Description

Technical field: [0001] The invention relates to a method for correcting the error of a strapdown aviation gravimeter, in particular to a method for correcting the error of a strapdown type gravimeter based on correlation analysis and empirical model decomposition. Background technique: [0002] The information of the Earth's gravitational field plays a very important role in the fields of geophysics, geodesy, and geodynamics. Among all the means of measuring the Earth's gravitational field, airborne gravity measurement is a high-efficiency means to obtain high-precision and large-scale Earth's gravitational field. Aeronautical gravimeters are divided into platform-type and strapdown-type gravimeters. The biggest difference between strapdown-type gravimeters and platform-type gravimeters is that strapdown-type gravimeters use mathematical methods instead of actual stable platforms to obtain gravity field information. The strapdown gravimeter has the advantages of simple str...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/06G01V7/16
CPCG01V7/06G01V7/16
Inventor 吴美平王明皓
Owner NAT UNIV OF DEFENSE TECH
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