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A d/f conversion method based on dual-scale output

A conversion method and dual-scale technology, applied in gyroscope/steering sensing equipment, instruments, surveying and navigation, etc., can solve the problems of increasing hardware resource consumption, unable to meet the range and resolution of fiber optic gyroscope at the same time, and reduce the Circuit complexity, resolving the contradiction between range and resolution, and reducing difficulty

Active Publication Date: 2019-04-09
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical solution problem of the present invention is: overcome above shortcoming, provide the D / F conversion method based on double-scale output, this method is a kind of simple and easy D / F conversion method that realizes in all-digital closed-loop fiber optic gyroscope, solves In order to solve the problem of increasing the consumption of hardware resources, the present invention further solves the contradiction that the single-scale output cannot satisfy the range and resolution of the fiber optic gyroscope at the same time.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] Based on the D / F conversion method of dual-scale output, the steps of the method include:

[0044] (1) The data update period of the fiber optic gyroscope, that is, the period of the strobe signal is T filter_b = 1 / 137.5KHz = 7.27us, T filter_s =1 / 137.5KHz=7.27us. According to the eigenfrequency of the fiber optic gyroscope being f=137.5KHz, the measurement range A=300° / s of the fiber optic gyroscope and the final output scaling factor K=24000 of the fiber optic gyroscope, the output data digit 2n+1 of the fiber optic gyroscope is determined. The method satisfies formula (8):

[0045] ((2 n -1)+2 n ×(2 n -1))×f=K×A (8)

[0046] The calculated data digits are rounded up, and n is a natural number;

[0047] Calculated to obtain ((2 n -1)+2 n ×(2 n -1)) is greater than 52.4, and when n=3 meets the requirements of the formula, recalculate K=28875 according to n=3.

[0048] (2) Divide the pulse output scale of the fiber optic gyroscope into a large scale k 1 and ...

Embodiment 2

[0071] Based on the D / F conversion method of dual-scale output, the steps of the method include:

[0072] (1) The data update period of the fiber optic gyroscope, that is, the period of the strobe signal is T filter_b = 1 / 137.5KHz = 7.27us, T filter_s =1 / 137.5KHz=7.27us. According to the eigenfrequency of the fiber optic gyroscope being f=137.5KHz, the measurement range A=300° / s of the fiber optic gyroscope and the final output scaling factor K=24000 of the fiber optic gyroscope, the output data digit 2n+1 of the fiber optic gyroscope is determined. The method satisfies formula (13):

[0073] ((2 n -1)+2 n ×(2 n -1))×f=K×A (13)

[0074] The calculated data digits are rounded up, and n is a natural number;

[0075] Calculated to obtain ((2 n -1)+2 n ×(2 n -1)) is greater than 52.4, and when n=3 meets the requirements of the formula, recalculate K=28875 according to n=3.

[0076] (2) Divide the pulse output scale of the fiber optic gyroscope into a large scale k 1 an...

Embodiment 3

[0099] Based on the D / F conversion method of dual-scale output, the steps of the method include:

[0100] (1) The data update period of the fiber optic gyroscope, that is, the period of the strobe signal is T filter_b = 1 / 137.5KHz = 7.27us, T filter_s =1 / 137.5KHz=7.27us. According to the eigenfrequency of the fiber optic gyroscope being f=137.5KHz, the measurement range A=300° / s of the fiber optic gyroscope and the final output scaling factor K=24000 of the fiber optic gyroscope, the output data digit 2n+1 of the fiber optic gyroscope is determined. The method satisfies formula (18):

[0101] ((2 n -1)+2 n ×(2 n -1))×f=K×A (18);

[0102] The calculated data digits are rounded up, and n is a natural number;

[0103] Calculated to obtain ((2 n -1)+2 n ×(2 n -1)) is greater than 52.4, and when n=3 meets the requirements of the formula, recalculate K=28875 according to n=3.

[0104] (2) Divide the pulse output scale of the fiber optic gyroscope into a large scale k 1 a...

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Abstract

The invention relates to a D / F conversion method based on double scale outputting, in particular to the D / F conversion method based on double scale outputting and applied to an all-digital closed-loop fiber-optic gyroscope, and belongs to the technical field of fiber-optic-gyroscope-angle rate measurement. The D / F conversion method is achieved through pure codes, hardware resources such as a D / A convertor and a V / F conversion circuit are avoided, and the complex degree of the circuit is reduced; according to eigen frequency and the measurement ranges of different fiber-optic gyroscopes for calculating, the required pulse output scheme can be quite easy to obtain; according to the measurement range and resolution ratio requirements of the fiber-optic gyroscopes, a large scale K1 and a small scale K2 are used respectively for outputting, the problem that as the measurement ranges are extended, high-frequency pulse outputting is adopted is solved, and the problem that the resolution ratio is lacked after the measurement ranges are extended with low-frequency pulses.

Description

technical field [0001] The invention relates to a D / F conversion method based on dual-scale output, in particular to a D / F conversion method based on dual-scale output applied to an all-digital closed-loop optical fiber gyroscope, and belongs to the technical field of optical fiber gyroscope angular rate measurement. Background technique [0002] D / F conversion is a typical conversion process from digital output to analog pulse output. During the development and commercialization of fiber optic gyroscope models, in order to meet the interface requirements of different models and facilitate subsequent adaptive changes, fiber optic gyroscope products In the all-digital closed-loop detection circuit, the pulse output method is adopted, that is, the digital quantity is converted into pulse output. [0003] At present, D / F conversion mainly includes D-V-F conversion and pure D / F conversion. D-V-F conversion is to indirectly convert digital quantities into frequency signal output...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 李勇赵亚飞杨博付明睿孙丽张金保林松李建鹏
Owner BEIJING INST OF CONTROL ENG
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