A Method of Obtaining the Gravitational Acceleration of the Earth's Background Field

Abstract

The invention relates to a method for obtaining high-precision gravity acceleration of earth background fields, which comprises the following steps of: step 1, synchronously recording the vibration speed information of a reference prism and the interference fringe signal containing falling body time displacement information in the falling body free falling process in an absolute gravimeter; step 2, extracting the time displacement coordinates on a falling body falling track, i.e. the reconstruction point of the falling body free falling track; step 3, using a cluster of parallel straight lines with the same gradient for being crossed with the reference prism speed and time coordinate curve to obtain the time points corresponding to the crossed intersection points; step 4, selecting the reconstruction points corresponding to the time points obtained in the step 2 on the falling body time displacement coordinate curve; and step 5, calculating the gravity acceleration according to the reconstruction points selected in the step 4. The method of the invention has the advantages that the influence on the ground vibration can be effectively eliminated, the huge vibration isolation system is avoided through an integral measurement structure, and the method support is provided for the miniaturization and the flowing measurement of the absolute gravimeter.

Description

technical field [0001] The invention relates to a method for obtaining gravitational acceleration by using an absolute gravimeter, and the vibration error of the measurement result is eliminated by selecting points by drawing lines. Background technique [0002] The gravity field is the basic geophysical field that reflects the material structure and changes inside the earth. High-precision gravity observation data is the basis for earthquake monitoring and forecasting, earth science research, resource exploration and other fields. It is also the basis for national precision measurement, aircraft navigation and missile guidance. Indispensable strategic data. The laser interferometric absolute gravimeter is a mainstream design method in the current absolute gravimeter. 2 , to commemorate the Italian Galileo, put cm / s 2 An important observational device for absolute gravity data known as Ga). The Gravity Laboratory of the International Bureau of Weights and Measures coopera...

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Problems solved by technology

However, due to the limitation of the manufacturing process of the spring itself, the volume of the vibration isolation system becomes large, which is not conducive to the miniaturization and flow measurement of the absolute gravimeter

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