Atom interference gravity gradient measuring method under satellite borne microgravity environment

Abstract

The invention provides an atom interference gravity gradient measuring method under a satellite borne microgravity environment; the method comprises the following steps: 1, symmetrically placing magneto-optical traps with respect to satellite center of mass three-shaft; 2, laser-cooling capturing cold atoms; 3, closing the magnetic field coil current of the magneto-optical traps; 4, laser-controlling atoms to finish the atom interference measurement; 5, extracting the satellite angular velocity. The method utilizes the unique conditions that atoms freely float in a damping-free flight state under the space weight loss environment, directly enables laser and the free floating atoms in the space to mutually react, thus enabling the atoms to form the interference effect, and carrying out gravity gradient measurement. The method is simple, easy to operate, and can be easily applied in space.

Description

technical field [0001] The invention relates to a measurement method, in particular to an atomic interference gravity gradient measurement method suitable for space-borne microgravity environment. Background technique [0002] Satellite gravity gradient measurement is one of the most effective means to obtain the Earth's gravity field with high precision. A high-precision global gravity field model plays an important role in geodesy, earth science, resource exploration and other fields. The satellite gravity gradient measurement adopts the measurement principle of differential acceleration. One or more pairs of gravimeters separated by a certain baseline length form a spaceborne gravity gradiometer for differential measurement to obtain the variation of the gravitational acceleration g with space, that is, the gravity gradient tensor. The following formula (1): [0003] [0004] At present, the space-borne gravity gradiometer used for satellite gravity gradient measureme...

AI Technical Summary

Problems solved by technology

[0009] (2) Limited by the 1g gravitational acceleration on the ground, only the gravity gradient component V along the radial direction of the earth's center can be measured zz

[0010] At this time, if the gravitational gradient measurement method of "throwing up and down" atoms used on the ground is still used in space, a longer interference time cannot be obtained, and the measurement accuracy cannot be improved.

Images