Selection method of rotary accelerometer type gravity gradient sensor original sampling frequency

Abstract

The invention relates to a selection method of rotary accelerometer type gravity gradient sensor original sampling frequency. The method is technically characterized by comprising the following steps:step one, performing discrete sampling on an accelerometer combinatorial output analog signal in a rotary accelerometer type gravity gradient sensor in the work; step two, obtaining multiple groups of system output digital signals with different sampling frequencies through a group of signals obtained in the step one by using a sampling method; step three, computing the power spectral density values of multiple groups of signals obtained in the step two at the rotary frequency double-frequency; step four, performing first-order linear fitting on the sampling frequency reciprocal of multiple groups of signals in the step three and the corresponding power spectral density values by utilizing the least square method, thereby obtaining a monomial term coefficient a1 and an absolute term coefficient a0; and step five, determining the optimal original sampling frequency. The minimum of white noise energy nearby the double frequency of the output signal can be realized, and the hardware realization cost is lowest.

Description

technical field [0001] The invention belongs to the technical field of gravity gradient sensors, and relates to a method for selecting an original sampling frequency of a gravity gradient sensor, in particular to a method for selecting an original sampling frequency of a rotational accelerometer type gravity gradient sensor. Background technique [0002] Rotational accelerometer-type gravity gradiometer is an instrument for continuous measurement of micro-gravity gradient changes on the earth's surface. Such as figure 2 As shown, the gravity gradient measurement assembly as the core sensor is composed of four equidistant pair-mounted quartz flexible accelerometers mounted on a rotating disk. The detection centroid of each accelerometer is equal to the distance from the center of the disk, the sensitive axis of the accelerometer is tangent to the circle, two sets of accelerometers are installed orthogonally, and the sensitive axis of each set of accelerometers is installed i...

AI Technical Summary

Problems solved by technology

However, increasing the original sampling frequency of the system not only requires a higher rate of precision ADC, but also takes up a lot of processor resources, and also significantly increases the amount of data and increases the data transmission load.

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