A method and system for downward continuation of aviation gravity vector based on gradient method

Abstract

The invention discloses a method and system for downward continuation of airborne gravity vector based on a gradient method. The method comprises the steps that a high-precision ultra-high-order earthgravity field model is utilized to calculate correction of three components of a gravity vector in the radial direction; continuation height is obtained; the correction of the three components of thegravity vector in the radial direction is calculated according to the continuation height to obtain the correction value of the three components of the gravity vector in the radial direction; airborne gravity vector measurement data are acquired; the airborne gravity vector measurement data are corrected according to the correction value in the radial direction of the gravity vector to obtain gravity vector three-component data on the continuation surface; and precision evaluation is carried out on the gravity vector three-component data on the continuation surface to obtain a precision evaluation result. The method and system can realize effective continuation of the airborne gravity vector three-component measurement data at any point in the air, and the precision of the continuation result is higher.

Description

technical field [0001] The invention relates to the field of airborne gravity measurement, in particular to a method and system for downward extension of airborne gravity vector based on gradient method. Background technique [0002] Airborne gravity vector measurement is an activity of measuring the three components of the earth's disturbance gravitational force by using the aircraft as the carrier and using the airborne gravity vector measurement system. Compared with scalar, aviation gravity vector has obvious advantages. In the same operation time, it can obtain three times the earth's gravity field information as scalar measurement. The two horizontal components (east and north components) are converted High-precision vertical line deviation information can be obtained. In addition, the reasonable combination of the three-component information measured by the vector method can significantly improve the determination accuracy of the local geoid, which has very important...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used downward continuation methods are all researched on the airborne gravity scalar measurement data, and there is no downward continuation method suitable for the airborne gravity vector measurement data

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