Gravity gradient demodulating method for gravity gradiometer of rotating accelerometer

A technology of rotational acceleration and gravity gradiometer, which is applied in the direction of instruments, scientific instruments, and gravitational field measurement, and can solve problems such as difficulty in extracting gravity gradient signals and weak gravity gradient abnormal signals

Active Publication Date: 2015-09-09
SOUTHEAST UNIV
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Problems solved by technology

[0003] The abnormal signal of the gravity gradient on the ground is very weak, and due to the processing technology of the accelerometer and the device performance of the gradiometer, there is considerable noise in the output signal of the gradiometer, and these noises are generally one or even several orders of magnitude of the gravity gradient signal , making the original very weak gravity gradient signal more difficult to extract; therefore, how to extract the weak gradient signal from the large noise signal has very great research value, and it is also a link that must be solved in the design and manufacture of the gravity gradiometer of the rotating accelerometer

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  • Gravity gradient demodulating method for gravity gradiometer of rotating accelerometer

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0024] figure 2 It is a schematic diagram of the online feedback adjustment of the accelerometer scale factor. The specific process steps are as follows:

[0025] 1) Obtain the disc angular position signal θ of the rotating accelerometer gravity gradiometer ij ;

[0026] Among them, θ ij is the angle information at the i-th position when the disk rotates jth circle, i=1, 2, ..., N, N is the number of position information obtained by each circle of the disk, and the number of disk rotation j>1 ;

[0027] 2) Use the disc angular position signal obtained in step 1) as the initial phase angle of the demodulation reference signal sin2ωt and cos2ωt, that is: the demodulation reference signal becomes sin2(ωt+θ ij ) and cos2(ωt+θ ij ), this reference signal is sent by the DSP processor;

[0028] Among them, ω is the rotational angular frequency of the disc, a...

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Abstract

The invention discloses a gravity gradient demodulating method for a gravity gradiometer of a rotating accelerometer. A high-density grating encoder is used for obtaining the angular position information of a disc at the current state. The angular position information of the disc is used as an initial phase angle for demodulating a reference signal. Gravity gradient demodulation is performed on the output signal of the gravity gradiometer for respectively demodulating the gravity gradient information at each disc rotating angle position. Then the gravity gradient information which is demodulated in each cycle is averaged. Finally smoothing filtering processing is performed on the two sets of demodulated gravity gradient information respectively, thereby obtaining gravity gradient components with higher precision. Through the gravity gradient demodulating method, the gravity gradient demodulating precision of the gravity gradiometer of the rotating accelerator can be further improved.

Description

technical field [0001] The invention relates to a demodulation method of a rotational accelerometer gravity gradiometer, in particular to a new method for improving the accuracy of gravity gradient demodulation by using disc angle position information as a gravity gradient auxiliary demodulation means. Background technique [0002] High-precision gravity gradient measurement is of great significance to the development of space science, earth science, geological science, and inertial navigation. At the same time, gravity gradient measurement is considered to be one of the most effective means of resource exploration. Basic geological research, geodesy, exploration of oil and gas mineral resources and other fields have important application prospects. Airborne gravity gradient measurement has important application value for the acquisition of basic data in mountainous areas, uninhabited areas, islands and coastal continental shelves. [0003] The abnormal signal of the gravity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/06
Inventor 蔡体菁钱学武
Owner SOUTHEAST UNIV
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