Airborne gravity downward continuation method based on integral iteration algorithm

An aviation gravity and iterative algorithm technology, applied in the direction of measuring gravitational field, measuring devices, instruments, etc., can solve problems such as difficult to obtain vertical gradient accurately, unable to achieve rapid continuation, and areas lacking terrain data, etc.

Active Publication Date: 2013-11-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The method of the virtual point mass model is simple, but it is greatly affected by the boundary effect
The gradient method cannot combine the existing ground data, and it is difficult to accurately obtain the vertical gradient of the gravity anomaly in practical applications
The least squares configuration method can take into account the error of the observed quantity and calculate the error covariance matrix to be estimated, but this method needs to solve the inverse matrix of a very large covariance matrix,...

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  • Airborne gravity downward continuation method based on integral iteration algorithm
  • Airborne gravity downward continuation method based on integral iteration algorithm
  • Airborne gravity downward continuation method based on integral iteration algorithm

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] An airborne gravity downward continuation method based on the integral iterative algorithm of the present invention is: when the airborne gravity measurement data in the survey area is extended downward, the airborne gravity measurement data is used as the initial value of the integral iteration to carry out upward continuation ; The difference between the upward continuation result obtained by the upward continuation and the airborne gravity measurement data is used as the feedback amount of the downward continuation result; the new iteration initial value is obtained by superimposing the feedback amount and the initial value for the next iteration.

[0028] The basic principle of the inventive method is as follows:

[0029] According to the Dirichlet problem of the first boundary value, if it is known that a certain function ...

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Abstract

The invention discloses an airborne gravity downward continuation method based on integral iteration algorithm. The method comprises the following steps of when the airborne gravity measurement data of a measured area is subjected to downwards continuation, taking the airborne gravity measurement data as the original value of integral iteration and performing upwards continuation on the airborne gravity measurement data; calculating the difference between an upward continuation result obtained by upward continuation and the airborne gravity measurement data, and taking the difference as the feedback quantity of a downward continuation result; and superposing the feedback quantity and the original value to obtain a new iterative original value, and performing next iteration on the new iterative original value. The method has the advantages of simple principle, simple and convenient operation, easiness in popularization, capability of improving data precision and confidence degree, and the like.

Description

technical field [0001] The invention mainly relates to the technical field of airborne gravity measurement, in particular to an airborne gravity downward continuation method based on an integral iterative algorithm. Background technique [0002] The earth's gravitational field is a basic physical field of the earth, which has great strategic and fundamental significance in the fields of basic science, military and national security. Aeronautical gravity measurement is a method of determining the regional and local gravity field with the aircraft as the carrier. Its measurement speed is fast, the range is wide, and the cost is low. [0003] Aeronautical gravity measurement obtains gravity anomaly data at flight altitude, and these measurement data are usually in the air hundreds of meters or even thousands of meters above the earth's surface. The data thus obtained cannot be directly applied to the earth's surface or the geoid, so it is necessary to extend the airborne gravi...

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Application Information

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IPC IPC(8): G01V7/00
Inventor 吴美平赵磊张开东
Owner NAT UNIV OF DEFENSE TECH
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