Method for evaluating resolution of fiber-optic gyroscope

A technology of fiber optic gyroscope and evaluation method, which is applied in the field of guidance and control and navigation, and can solve problems such as the inability to provide the angular rate change of the resolution of the fiber optic gyroscope, the lack of strict testing methods for the resolution of the fiber optic gyroscope, and the lack of open literature. Achieve short test time, eliminate the influence of zero bias and environmental magnetic field, and fill the gap

Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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Problems solved by technology

First of all, the current rate turntable cannot provide the angular rate change of the resolution level of the fiber optic gyroscope (0.0001 degrees / second). The noise and drift of the gyroscope are equivalent to the magnitude of the resolution. Using a fixed zero bias to calculate will inevitably bring a large error
[0005] At present, domestic research and development units do not have very strict testing methods for the resolution of fiber optic gyroscopes, and there are no relevant public documents abroad.

Method used

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  • Method for evaluating resolution of fiber-optic gyroscope
  • Method for evaluating resolution of fiber-optic gyroscope
  • Method for evaluating resolution of fiber-optic gyroscope

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Embodiment Construction

[0041] The principle of resolution test is to try to add a small angular rate increment to the input of the fiber optic gyroscope, test its output increment and compare it with the theoretical value. First, according to the "specified input angular rate" described in the definition of resolution, determine the basic position, that is, the value of the angle θ between the input axis of the fiber optic gyroscope and true north. Since there is no strict selection method for this "specified input angular rate", it is only necessary to select the value of θ as θ in actual operation 0 The position of is used as the base position, the theoretical input angular rate of this position is an order of magnitude larger than the threshold, and near this position, that is, the value of θ is within θ 0 When the vicinity changes, there is a required test position. At this test position, the angular rate on the input axis of the fiber optic gyroscope has an angular rate change of the order of t...

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Abstract

The invention discloses a method for evaluating resolution of a fiber-optic gyroscope, comprising the following steps of: installing the fiber-optic gyroscope on an aiming-north single-axis position turntable, making its input shaft parallel to the horizontal plane, determining a test position according to indexes of the resolution to be measured and the local latitude, turning the position turntable to the test position, acquiring multi-group fiber-optic gyroscope data, calculating, and evaluating whether the resolution of the fiber-optic gyroscope satisfies the requirement of the indexes to be measured. The method provided by the invention is simple to operate, is easy to realize, and can be used to guarantee accuracy and precision of the test.

Description

technical field [0001] The invention relates to the fields of navigation, guidance and control, in particular to a method for evaluating the resolution of an optical fiber gyroscope. Background technique [0002] The resolution of the fiber optic gyroscope refers to the minimum input angular rate increment that the fiber optic gyroscope can be sensitive to at a specified input angular rate. The output increment produced by this angular rate increment should be at least equal to 50% of the expected output increment value by the scaling factor. [0003] The resolution reflects the measurement accuracy of the fiber optic gyroscope. If the resolution is low, even for a certain input angular rate, the measurement error of the fiber optic gyroscope is not large. In practical applications, the resulting measurement error may exceed that of the fiber optic gyroscope. noise error and drift error. Assuming that the resolution of the FOG is 1 degree / hour, it means that for an angular...

Claims

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Application Information

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IPC IPC(8): G01C25/00
Inventor 楼奇哲周一览杨建华舒晓武
Owner ZHEJIANG UNIV
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