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Vector modulator of precision measuring using vector sensor

A technology of vector modulation and sensors, applied in the direction of mitigating undesired effects, etc., can solve problems such as suboptimal solutions

Inactive Publication Date: 2005-01-05
赵岳生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, many experts and scholars are committed to the research of measurement error correction. Methods such as optimal estimation, filtering, feedback, compensation, isolation, and shielding can reduce sensor system errors to a certain extent, but they are not the best solution.

Method used

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  • Vector modulator of precision measuring using vector sensor

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Embodiment Construction

[0011] Here we take the fiber optic gyroscope to measure the input angular rate as an example to illustrate the vector modulation method, and other applications are the same.

[0012] As shown in the figure, when the rotation is modulated, Ω is the measurement axis of the gyroscope, and the input angular rate is in the plane perpendicular to the ω axis. Rotate the fiber optic gyroscope around the ω axis at a certain rate, such as 20 revolutions per second, extract the amplitude and phase of the 20HZ harmonic component from the output signal of the gyroscope, and after signal processing, it is the amplitude and direction of the inertial quantity to be measured information.

[0013] During swing modulation, Ω is the measurement axis of the gyroscope, and the input signal is in its vertical direction. With ω as the axis, the fiber optic gyroscope swings to the left and right sides of the Ω axis with an equal amplitude, for example, a maximum of 45 degrees, and swings back and for...

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Abstract

The invention is a vector modulation method which uses modulation and demodulation principle, it is a high precise measuring method separating offset of sensor, offset deviation, inner noise and external disturbance affection. The vector modulation method modulates the input signal into amplitude sine wave, extracts the component with the same frequency from the signal outputted by the sensor, which is the lowest noise inputting response of the physical quantity to be measured.

Description

Technical field [0001] The invention relates to a method for high-precision measurement. Significantly reduce the measurement error caused by the sensor's internal offset, offset drift, various noises and external interference, and accurately separate the response caused by the input quantity, which is suitable for precise measurement of vector physical quantities, referred to as "vector modulation method". Background technique [0002] There are generally offsets, offset drifts, and various noises inside the sensor, and they are subject to external interference, causing system errors. The main factor limiting the accuracy of a measurement system is sensor error. [0003] Common methods to reduce sensor errors are: isolation, protection, shielding, modulation, filtering, optimal estimation, feedback, and compensation. It should be considered to modulate the signal as early as possible. Once the interference or noise enters the signal and becomes part of the signal, it can ...

Claims

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Application Information

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IPC IPC(8): G01D3/028
Inventor 赵岳生邓正隆
Owner 赵岳生