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Dynamic real-time estimation method for scale factor inconsistency of accelerometer of gravity gradiometer

A technology of gravity gradiometer and scale factor, which is applied in the directions of instruments, scientific instruments, measuring gravitational fields, etc., can solve problems such as lack of in-depth research, and achieve the effect of improving estimation accuracy, dynamic measurement accuracy, and dynamic estimation accuracy.

Pending Publication Date: 2022-01-04
TIANJIN NAVIGATION INSTR RES INST
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Problems solved by technology

For this reason, many researchers have proposed different adjustment methods for accelerometer scale factors, but the absolute majority of the solutions are only for adjustment methods under static conditions, and there is a lack of in-depth research on how to deal with dynamic disturbances under dynamic conditions

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  • Dynamic real-time estimation method for scale factor inconsistency of accelerometer of gravity gradiometer
  • Dynamic real-time estimation method for scale factor inconsistency of accelerometer of gravity gradiometer
  • Dynamic real-time estimation method for scale factor inconsistency of accelerometer of gravity gradiometer

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Embodiment Construction

[0063] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0064] A method for dynamically and real-time estimating the scale factor inconsistency of a gravity gradiometer accelerometer, comprising the following steps:

[0065] Step 1. Under dynamic conditions, demodulate the output signal of the gravity gradiometer at the rotation frequency ω, and obtain the double frequency component D of the output signal of the gravity gradiometer 1 and D 2 ;

[0066] The concrete formula of described step 1 is:

[0067]

[0068] In the formula, D 1 and D 2 is the rotation frequency ω sine component and cosine component of the output signal of the gravity gradiometer, and F() means to low-pass filter the signal in the brackets.

[0069] Step 2. In order to improve the accuracy of information extraction of inconsistencies in the scale factors of the two accelerometers under dynamic conditions, based on the one-o...

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Abstract

The invention relates to a dynamic real-time estimation method for the scale factor inconsistency of an accelerometer of a gravity gradiometer, and the method comprises the following steps: step 1, carrying out the demodulation of an output signal of the gravity gradiometer at a rotation frequency omega under a dynamic condition, and obtaining a frequency multiplication component D1 and a frequency multiplication component D2 of the output signal of the gravity gradiometer; step 2, introducing a Kalman filtering link in inconsistent information extraction based on the frequency multiplication component of the output signal of the gravity gradiometer obtained in the step 1, and realizing optimal estimation of two paths of information; and step 3, introducing an adaptive filtering method in the step 2 to obtain real-time optimal estimation of scale factor inconsistent signals of the two paths of symmetrically mounted accelerometers. According to the invention, the dynamic adjustment precision of the scale factor of the accelerometer can be improved, so that the dynamic measurement precision of the rotary accelerometer type gravity gradiometer is improved.

Description

technical field [0001] The invention belongs to the technical field of gravity gradiometers, in particular to a dynamic real-time estimation method for the inconsistency of scale factors of gravity gradiometer accelerometers. Background technique [0002] Gravity gradient is the spatial change rate of gravity vector, which is of great significance in mineral resource exploration, earth science research and inertial navigation. Gravity gradiometer is a precision device used to measure gravity gradient. The gravity gradiometer based on the measurement principle of rotating accelerometer proposed by Bell Aerospace is the only practical near-surface dynamic gravity gradiometer so far. Such as figure 1 As shown, the gravity gradient measurement component as the core sensor is based on the principle of accelerometer position differential measurement, and modulates the gravity gradient tensor component to the double frequency of the system rotation frequency through mechanical rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00G01V7/00
CPCG01V13/00G01V7/00
Inventor 李达李城锁高巍刘万国李中
Owner TIANJIN NAVIGATION INSTR RES INST
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