Full-tensor gravity gradient dynamic measurement system and method

Abstract

The invention relates to a full-tensor gravity gradient measurement system and method. The system comprises a stabilized platform, a single rotary accelerometer type gravity gradient sensor, a singlerelative gravity sensor, and a display control computer. The single rotary accelerometer type gravity gradient sensor and the single relative gravity sensor are fixedly connected and are jointly installed on the stabilized platform. Signal output end chalks of the single rotary accelerometer type gravity gradient sensor, the single relative gravity sensor and the stable platform are connected witha display control computer and used for outputting collected horizontal component gravity gradient tensor data, relative gravity data and carrier motion data to the display control computer, and calculating full-tensor gravity gradient information. According to the invention, the real-time measurement function of the full-tensor gravity gradient information under a movable base can be realized through a mathematical decoupling method.

Description

technical field [0001] The invention belongs to the technical field of gravity gradient dynamic measurement, and relates to a gravity gradient dynamic measurement system for measuring current position full tensor gravity gradient information on a moving base (on a mobile platform such as a ship or an aircraft), especially a full tensor gravity gradient measurement system. Gradient dynamic measurement system and method. Background technique [0002] The gravity gradient is the spatial gradient of the gravity acceleration vector, that is, the second derivative of the gravity potential, which characterizes the spatial change rate of the gravity vector. In a geographic coordinate system, the gravity vector It can be decomposed into three components in the three directions of x, y, and z, and each component has a gradient along the direction parallel to the coordinate axis. Therefore, the gravity gradient tensor has a total of 3×3 components, such as figure 1 shown. [0003]...

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Problems solved by technology

[0021] In view of the weak gravity gradient signal, the full tensor gravity gradiometer has high requirements on the consistency of the three gravity gradient sensors, and the way of umbrella layout makes the accelerometer in each gravity gradiometer sensor need to be sensitive 5m / s 2 Left and right gravitational excitation, which also puts forward high requirements on the nonlinear error of the accelerometer, usually better than 10 -8 g / g 2 In addition, the three gravity gradient sensors in each full tensor gravity gradiometer also bring problems such as high cost and large geometric size. At the same time, the matching problem of the three gravity gradient sensors needs to be considered, and the engineering application cost high

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