Method and equipment for airborne gravity measurement

Abstract

The embodiment of the invention relates to gravity measurement, and discloses a method and equipment for airborne gravity measurement. The method for the airborne gravity measurement is applied to anairborne gravity measurement device, and comprises the steps that according to an airborne measurement air route, the position of a to-be-measured point is acquired, and an airplane flies to the to-be-measured point; under the situation that the airplane and the to-be-measured point are in a relative rest state, a test block is released on the to-be-measured point, and displacement data and time data of the test block in vacuum falling body space are detected, wherein the vacuum falling body space is located in the airborne gravity measurement device; according to the displacement data and thetime data, an absolute gravity value of the to-be-measured point is calculated. The method and equipment for the airborne gravity measurement have the advantages that the near-earth airborne gravitycan be measured rapidly and accurately, and the accuracy of the airborne gravity measurement is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of gravity measurement, and in particular to a method and equipment for aerial gravity measurement. Background technique [0002] Aeronautical gravity measurement refers to a gravity measurement method that uses an aircraft as a carrier and uses a relative gravimeter to measure gravity anomalies in the near-earth air. Due to the use of aircraft as the carrier for gravity measurement, aerial gravity measurement is suitable for swamps, mountains, water-land junctions and other areas that are difficult for road surveyors to reach. [0003] At present, the way to obtain the gravitational acceleration of the measurement position in airborne gravity measurement is: through the relative gravimeter to measure the total acceleration including the gravitational acceleration, the carrier motion acceleration and some other disturbance accelerations, and subtract the value of the carrier motion accelerati...

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Problems solved by technology

[0004] The inventors have found that there are at least the following problems in the prior art: the current airborne gravity measurement usually adopts the method of relative gravity measurement, because the relative gravity measurement can only obtain the relative change of gravity, but cannot obtain the absolute value of gravity, resulting in the inability to directly determine The absolute value of the gravity of the measured place; and the relative gravimeter that measures the relative gravity is susceptible to the influence of temperature and air pressure, which will cause the problem of zero drift in the measurement, resulting in inaccurate gravity measurement and slow measurement speed

At the same time, since the relative gravity measurement method needs to subtract the motion acceleration of the carrier when measuring gravity, the current motion acceleration of the carrier (aircraft) cannot be measured very accurately, so the accuracy of gravity measurement can only reach milligal (mGal) order of magnitude, it cannot better provide accurate gravity data for geodesy and earthquake prediction

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