CN108225299A - A kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit - Google Patents
A kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit Download PDFInfo
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- CN108225299A CN108225299A CN201711390094.8A CN201711390094A CN108225299A CN 108225299 A CN108225299 A CN 108225299A CN 201711390094 A CN201711390094 A CN 201711390094A CN 108225299 A CN108225299 A CN 108225299A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
Abstract
The present invention relates to a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuits, its technical characteristics is to include FPGA module, three tunnel filter amplification circuits and respective analog to digital conversion circuit, three way analog conversion circuits and respective filter amplification circuit, three tunnel filter amplification circuits are connected with three detector signals and are input in FPGA module through analog to digital conversion circuit respectively, and Jing San Road D/A converting circuit and filter amplification circuit export three tunnel modulated signals to FPGA module after processing.Three road detector signals are sent into same fpga chip by the present invention, are demodulated operation respectively, and operation result is exported respectively, and in addition to per the necessary Simulation scale-up filtering chip of signal all the way, all digital signals carry out digital processing by one piece of fpga chip；Meanwhile the function of second servo loop compensation operation is realized using software scenario, independent serial digital-analog conversion chip is eliminated, wiring board area is greatly saved, reduces the reuse of chip, reduces cost.
Description
Technical field
The invention belongs to fiber-optics gyroscope field, especially a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit.
Background technology
Inertial navigation system has the characteristics that entirely autonomous property, common-path interference, height concealment, be sea, land and sky, day,
Latent crucial positioning navigating device necessary to waiting fields weapon system.Simultaneously also to inertial positioning navigation equipment in precision, reaction
Ability, adverse circumstances adaptability, miniaturization, low cost etc. also gradually propose higher requirement.It is led as inertial positioning
The gyro of boat device core component develops the development that profound influence always inertial technology.Wherein optical fibre gyro has complete
Solid-state, long lifespan, dynamic range are big, instantaneous starting, the advantages that simple in structure, size is small, light-weight, it has also become inertia of new generation
Guide the leading device in measuring system.
Gyro is the core of navigation equipment, and performance, size and the cost of gyro have been largely fixed whole equipment
Performance, size and cost.Shared by light source, optical element integrates, optical parameter matches, relax optical element technology will
Seek, reduce the comprehensive performance of raising optical fibre gyro on the basis of device cost.Good optical fibre gyro integration thermal design, magnetic cup
It is realization system small light to cover design, Seal Design, low-cost design, reduces system cost, improves optical fibre gyro environment and fits
The key technology of answering property.
In single axis fiber gyro, the groundwork that modulation /demodulation circuit is completed is：Pick-up probe output includes
The electric signal of Sagnac phase shifts → be filtered to small-signal amplification → amplified analog signal is carried out digital-to-analogue conversion →
The modulated signal containing rotary speed information → modulated signal that operation → demodulation output is demodulated in digital processing chip carries out
The filter and amplification of digital-to-analogue conversion → modulated signal.Fig. 1 gives the minimalist program of digital closed-loop optic fiber gyroscope modulation /demodulation, real
The modulation /demodulation of existing three axis optical fibre gyro instrument, and will be after processing by number it is necessary to carry out above-mentioned processing to each axis respectively
The tach signal that signal represents is exported with certain agreement and sequential.
Traditional processing scheme is：Three road rings match complete modulation /demodulation circuit all the way respectively, and by three
The unified output after specific agreement and sequential processing of the output signal on road.The advantages of this scheme is the digital signal on three tunnels
Independently of one another, unification is only carried out in numeral output, the signal cross-talk between three axis is reduced, also just reduces the design of circuit
Difficulty.But the program increases the area of wiring board due to the use of three pieces of independent modulation /demodulation circuits；On the other hand,
The reuse of segment chip also increases line cost.It is unfavorable for miniaturization, the design of inexpensive three axis optical fibre gyro.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art, a kind of reasonable design, compact-sized and at low cost is proposed
Honest and clean miniaturization three axis optical fibre gyro modulation /demodulation circuit.
The present invention solves its technical problem and following technical scheme is taken to realize：
It is a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit, including FPGA module, the 1st tunnel filter amplification circuit and its
Analog to digital conversion circuit, the 2nd road analog to digital conversion circuit and its analog to digital conversion circuit, the 3rd tunnel filter amplification circuit and its analog-to-digital conversion
Circuit, the 1st way analog conversion circuit and its filter amplification circuit, the 2nd way analog conversion circuit and its filter amplification circuit, the 3rd
Way analog conversion circuit and its filter amplification circuit, three tunnel filter amplification circuits are connected and pass through with three detector signals respectively
Analog to digital conversion circuit is input in FPGA module, FPGA module Jing San Road D/A converting circuit and filter amplification circuit after processing
Export three tunnel modulated signals.
Be provided in the FPGA module the 1st road demodulation module and its second servo loop compensating module, the 2nd road demodulation module and
Its second servo loop compensating module, the 3rd road demodulation module and its second servo loop compensating module realize the demodulation and second per road signal
Loop compensation function.
Host computer communication module is additionally provided in the FPGA module, which is connected with RS422 modules
And the tach signal for demodulating output is sent to the numeral output of host computer and optical fibre gyro angle.
The advantages and positive effects of the present invention are：
Three road detector signals are sent into same fpga chips by the present invention, are demodulated operation respectively, and by operation knot
Fruit exports respectively, and in addition to per the necessary Simulation scale-up filtering chip of signal all the way, all digital signals are by one piece of fpga chip
Carry out digital processing；Meanwhile the function of second servo loop compensation operation is realized using software scenario, eliminate independent serial number
Mould conversion chip so as to which wiring board area be greatly saved, reduces the reuse of chip, reduces cost.
Description of the drawings
Fig. 1 is the light channel structure schematic diagram of three axis miniaturization optical fiber gyros；
Fig. 2 is the miniaturization three axis optical fibre gyro modulation /demodulation circuit block-diagram of the present invention；
Fig. 3 is the optical fibre gyro modem procedue schematic diagram of the present invention；
Fig. 4 is that there are detector output waveform figures during gain error under the modulation of four states；
Fig. 5 is the optical fibre gyro second servo loop demodulation principle of operation schematic diagram of the present invention.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
The present invention design philosophy be：
Firstth, three rings are modulated with demodulation and are demodulated fortune respectively it is necessary to be directed to the eigenfrequency of three rings
It calculates.The length of three rings is required in the range of 1 meter in three-axis integrative minimizes modulation /demodulation circuit, if with 1200 meters
For ring, then between 1199 meters to 1200 meters, eigenfrequency error can make the length of three rings within 70Hz
It is not right that with same modulating frequency three axis are demodulated with operation spike caused by without generating hesitation modulating frequency error
Title property, so as to be impacted to the full temperature bias repeatability of gyro.Therefore, the present invention can use a crystal oscillator, by number
Same global clock is generated after lock phase processor, modulation /demodulation operation is carried out at the same time to three road signals.
Second, to digital processing chip, three axis share a piece of fpga chip.It is being put per signal all the way by individually filtering
After big, digital processing chip is sent by modulus conversion chip and is demodulated operation.Therefore, three road signals are sent by the present invention
Same fpga chip is demodulated operation, and operation result is exported respectively respectively.It removes per the necessary simulation of signal all the way
To amplify outside filtering chip, all digital signals carry out digital processing by one piece of fpga chip, and wiring board area is greatly saved,
Reduce the reuse of chip, reduce cost.
Third, in high-precision optical fiber gyro, the gain of forward path and backfeed loop can all occur with factors such as temperature
Drift, and this drift is rather low-frequency.Electronic original part used in actual circuit is since PCB design is unreasonable, environment
The influences such as temperature change will appear the deterioration of performance, and the drift that electronic chip power supply is brought can also influence operation amplifier
The gain error of device, these inside and outside factor weave ins will all bring feedback channel gain error.This drift
Caused by gain error can not subtract each other to eliminate by odd even, it is necessary to carry out special Compensation Design.Namely second time
Road control measure.In the present invention special measure is also taken for second servo loop compensation.
In traditional scheme, often by an individual serial digital-analog conversion chip come to the half-wave voltage of Y waveguide into
Row adjustment operation in real time.To the half-wave voltage under different temperatures, different numbers is obtained by the compensation operation of second servo loop
Information, and this digital signal is converted into half-wave voltage reference value by above-mentioned independent serial digital-analog conversion chip.It is right in this way
For three axis accelerometer, it is necessary to which the individual serial digital-analog conversion chip of three pieces completes the second servo loop compensation operation per all the way.
In a kind of reduction procedure, by the selection of special chip, the serial digital-analog conversion chip with the output of 3 tunnels can be selected, is led to
Modification software algorithm is crossed, the function of the second servo loop compensation operation of three road signals is controlled so as to fulfill chip piece.
The present invention realizes the function of second servo loop compensation operation using software scenario.In the second loop, different temperatures
Lower half-wave voltage has difference.The half-wave voltage value under different temperatures is calculated by second servo loop compensation circuit, and with number
The form of amount represents.It is multiplied as coefficient with quadratic integral staircase waveform, the biasing wave exported, obtains final complete modulation letter
Number.Eliminate independent serial digital-analog conversion chip.
Based on above-mentioned mentality of designing, three-axis integrative is designed for the three axis miniaturization optical fiber gyro light channel structures that Fig. 1 is provided
Miniaturization optical fiber gyro modulation /demodulation circuit.Three axis miniaturization optical fiber gyro light channel structures are illustrated first, the light path knot
Structure is by a high-power ASE light source, 1 × 3 coupler, three 2 × 2 couplers, 3 Y waveguide integrated optical devices, 3 optical fiber
Ring and 3 detector compositions.The light sent out from high-power ASE light sources is divided into the identical light in 3 tunnels by 1 × 3 coupler and believes
Number, respectively three axis provide input optical signal.Per in gyro all the way, the light that light source is sent out is divided into two after 2 × 2 couplers
Lu Guang all the way into gyro light path, enters optical fiber loop, from fiber optic loop by being divided into two-way after Y waveguide integrated optical device
The interference light come is irised out by entering photodetector after coupler.In terms of ring making, 3 only with the symmetrical winding of multipole
Fiber optic coils length difference is controlled within 1m.
As shown in Fig. 2, three-axis integrative miniaturization optical fiber gyro modulation /demodulation circuit includes FPGA module, the filtering of the 1st tunnel is put
Big circuit and its analog to digital conversion circuit, the 2nd road analog to digital conversion circuit and its analog to digital conversion circuit, the 3rd tunnel filter amplification circuit and
Its analog to digital conversion circuit, the 1st way analog conversion circuit and its filter amplification circuit, the 2nd way analog conversion circuit and its filtering are put
Big circuit, the 3rd way analog conversion circuit and its filter amplification circuit and RS422 modules, 3 filter amplification circuits respectively with three
Detector signal is connected and is input in FPGA module after analog to digital conversion circuit, FPGA module Jing San Road digital-to-analogue after processing
Conversion circuit and filter amplification circuit export three tunnel modulated signals.The 1st road demodulation module and its second are provided in FPGA module
Loop compensation module, the 2nd road demodulation module and its second servo loop compensating module, the 3rd road demodulation module and its second servo loop compensation
Module and host computer communication module, the host computer communication module are connected with RS422 modules, and RS422 modules will demodulate output
Tach signal is transmitted to the numeral output of host computer and optical fibre gyro angle all with fixed transmitting-receiving agreement.
The principles of modulation and demodulation of three-axis integrative miniaturization optical fiber gyro modulation /demodulation circuit will be as shown in Fig. 2, detector will be adopted
The electric signal collected is transmitted to by modulus conversion chip in FPGA, the demodulated meter in FPGA by filter amplification circuit
The modulated signal obtained after calculation is applied to Y waveguide electrode by rear class D/A converting circuit and filter amplification circuit, forms closed loop
Feedback.
Due to the influence of the factors such as temperature change, the Ripple Noise of power source supplying voltage, the gain of backfeed loop can generate
Variation, the output interference signal of photodetector change.By taking the modulation of four states as an example, as shown in Figure 5.By to output error
Demodulation operation, adjust 2 π voltage values in real time, reach the accuracy that 2 π reset in complete warm range, this namely optical fibre gyro second
Circuit demodulates operation.In traditional sense, carrying out second servo loop demodulation operation needs to introduce additional serial D A digital analog converters, will
2 π voltage values under the different condition that second servo loop demodulates are by walking DA outputs.Additional chip can be introduced in this way, it is unfavorable
In the Miniaturization Design of three axis modulation /demodulation circuits.The present invention realizes above-mentioned function by software mode, and concrete methods of realizing is
It is also realized by FPGA module.As shown in figure 5, FPGA module includes the first loop modulation demodulation output module, second servo loop solution
Mode transfer block, second servo loop demodulation module demodulate 2 π voltage values under different condition, and 2 π voltage values are converted into different ratios
COEFFICIENT K, and COEFFICIENT K is multiplied with the staircase waveform of the first loop modulation demodulation output module output, so as to real-time compensation amendment system
Number K, achievees the effect that real-time compensation second servo loop.
It is emphasized that embodiment of the present invention is illustrative rather than limited, therefore present invention packet
Include the embodiment being not limited to described in specific embodiment, it is every by those skilled in the art according to the technique and scheme of the present invention
The other embodiment obtained, also belongs to the scope of protection of the invention.
Claims (3)
1. a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit, it is characterised in that：It is put including FPGA module, the filtering of the 1st tunnel
Big circuit and its analog to digital conversion circuit, the 2nd road analog to digital conversion circuit and its analog to digital conversion circuit, the 3rd tunnel filter amplification circuit and
Its analog to digital conversion circuit, the 1st way analog conversion circuit and its filter amplification circuit, the 2nd way analog conversion circuit and its filtering are put
Big circuit, the 3rd way analog conversion circuit and its filter amplification circuit, three tunnel filter amplification circuits respectively with three detector signals
It is connected and is input in FPGA module through analog to digital conversion circuit, FPGA module Jing San Road D/A converting circuit and filter after processing
Wave amplifying circuit exports three tunnel modulated signals.
2. a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit according to claim 1, it is characterised in that：It is described
The 1st road demodulation module and its second servo loop compensating module is provided in FPGA module, the 2nd road demodulation module and its second servo loop is mended
Module, the 3rd road demodulation module and its second servo loop compensating module are repaid, realizes and compensates work(per the demodulation of road signal and second servo loop
Energy.
3. a kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit according to claim 1, it is characterised in that：It is described
Host computer communication module is additionally provided in FPGA module, which is connected with RS422 modules and exports demodulation
Tach signal be sent to the numeral output of host computer and optical fibre gyro angle.
Priority Applications (1)
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| CN201711390094.8A CN108225299A (en) | 2017-12-21 | 2017-12-21 | A kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit |
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| CN201711390094.8A CN108225299A (en) | 2017-12-21 | 2017-12-21 | A kind of miniaturization three axis optical fibre gyro modulation /demodulation circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520490A (en) * | 2019-01-02 | 2019-03-26 | 中国船舶重工集团公司第七0七研究所 | A kind of fibre optic gyroscope communication adaptive approach |
| CN109974682A (en) * | 2019-03-21 | 2019-07-05 | 中国船舶重工集团公司第七0七研究所 | A kind of three axis optical fiber top modulation-demodulation device of microminiature |
| CN111998844A (en) * | 2020-08-13 | 2020-11-27 | 北京航空航天大学 | ASE light source for spherical inertial navigation system |
| CN112833874A (en) * | 2021-01-08 | 2021-05-25 | 中国船舶重工集团公司第七0七研究所 | Novel four-state modulation and demodulation method suitable for fiber-optic gyroscope |
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| CN1657876A (en) * | 2005-04-08 | 2005-08-24 | 北京航空航天大学 | Light small triaxial integral fibre-optical gyrometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109520490A (en) * | 2019-01-02 | 2019-03-26 | 中国船舶重工集团公司第七0七研究所 | A kind of fibre optic gyroscope communication adaptive approach |
| CN109974682A (en) * | 2019-03-21 | 2019-07-05 | 中国船舶重工集团公司第七0七研究所 | A kind of three axis optical fiber top modulation-demodulation device of microminiature |
| CN111998844A (en) * | 2020-08-13 | 2020-11-27 | 北京航空航天大学 | ASE light source for spherical inertial navigation system |
| CN112833874A (en) * | 2021-01-08 | 2021-05-25 | 中国船舶重工集团公司第七0七研究所 | Novel four-state modulation and demodulation method suitable for fiber-optic gyroscope |
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