CN106289223A - Resonance type optical fiber gyro syntonic follow circuit and digital phase moudlation device and phase modulation method - Google Patents
Resonance type optical fiber gyro syntonic follow circuit and digital phase moudlation device and phase modulation method Download PDFInfo
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- CN106289223A CN106289223A CN201610709932.2A CN201610709932A CN106289223A CN 106289223 A CN106289223 A CN 106289223A CN 201610709932 A CN201610709932 A CN 201610709932A CN 106289223 A CN106289223 A CN 106289223A
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- 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
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Abstract
The invention belongs to resonance type optical fiber gyro technology, relate to a kind of resonance type optical fiber gyro syntonic follow circuit, digital phase moudlation device and phase modulation method.Described resonance type optical fiber gyro digital phase moudlation device includes cosine function look-up table means, the first multiplier, the second multiplier, SIN function look-up table means, the first low pass filter, the second low pass filter, phase shifter, phase difference calculating module.Described phase modulation method passes through closed loop feedback, it is demodulated the phase adjusted between reference signal and signal to be demodulated, demodulated reference signal is gone to zero with the phase contrast of signal to be demodulated, thus the efficiency of phase demodulation is the highest, the phase place change between the brought demodulated reference signal of creep effect and the signal to be demodulated that fiber loop brings in time can be eliminated, improve the functional reliability of resonance type optical fiber gyro control circuit.It addition, the present invention also provides for a kind of syntonic follow circuit using this resonance type optical fiber gyro digital phase moudlation device.
Description
Technical field
The invention belongs to resonance type optical fiber gyro technology, relate to a kind of resonance type optical fiber gyro syntonic follow circuit, numeral
Phase modulation apparatus and phase modulation method.
Background technology
The advantage that resonance type optical fiber gyro is integrated with laser gyro and interference type optical fiber gyroscope, it is possible to utilize the shortest optical fiber
And it is realized with a low cost navigation level and the performance of higher level.It measures the realization of function by during by narrow linewidth laser frequency
Carve the resonant frequency being locked to sensitive optical fibre ring, and the resonant frequency of sensitive optical fibre ring is determined by carrier speed.Resonant frequency with
Track technology is one of core technology of resonance type optical fiber gyro, and its tracking accuracy is directly connected to the essence of resonance type optical fiber gyro
Degree.
The core of resonant frequency tracking technique is phase demodulation (also referred to as coherent demodulation) circuit, and phase-sensitive demodulating circuits
One of important regulating step is to realize the phase adjusted between demodulated reference signal and signal to be demodulated, has been used for phase adjusted
Device be known as phase modulation apparatus.
In resonance type optical fiber gyro, the environmentally sensitive property of fiber loop is high, and the resonance peak operating point of fiber loop has
Spy with temperature Rapid Variable Design (under canonical parameter, the free spectrum width of every degree Celsius of resonance peak 1000 fiber loops of change)
Point, is difficult to have a constant phase contrast.Prior art is in order to ensure the phase between demodulated reference signal with signal to be demodulated
Potential difference goes to zero, and general employing analog circuit carries out phase modulation, but the zero phase difference that this mode is obtained understands time to time change,
Directly affect the performance of syntonic follow circuit.
Summary of the invention
The purpose of the present invention: provide a kind of and can realize self adaptation phase in the phase-sensitive demodulating circuits of resonance type optical fiber gyro
The digital phase moudlation device of position regulation and phase modulation method.
Additionally also provide for a kind of syntonic follow circuit using this resonance type optical fiber gyro digital phase moudlation device.
Technical scheme: a kind of resonance type optical fiber gyro digital phase moudlation device, it includes cosine function look-up table
Module, the first multiplier, the second multiplier, SIN function look-up table means, the first low pass filter, the second low pass filter,
Phase shifter, phase difference calculating module, wherein, the input of described first multiplier is looked into analog-digital converter and cosine function simultaneously
Looking for table module to connect, its outfan is connected to phase difference calculating module through the first low pass filter, and the second multiplier input is same
Time be connected with analog-digital converter and SIN function look-up table means, its outfan divides two-way one tunnel to connect through the second low pass filter
To phase difference calculating module, another road is connected to the first digital to analog converter, simultaneously SIN function look-up table means outfan and phase
Being also associated with the phase shifter between potential difference computing module, this phase shifter exports external second digital to analog converter.
Described cosine function look-up table means, the first multiplier, the second multiplier, SIN function look-up table means, first
Low pass filter, the second low pass filter, phase shifter, phase difference calculating module are all integrated on field programmable gate array.
Described cosine function look-up table means and SIN function look-up table means are based in field programmable gate array
Storage resource.
Described first low pass filter, the second low pass filter the value of cut-off frequency by SIN function look-up table mould
Within the scope of the 1/20～1/10 of the sinusoidal signal frequency stored in block.
A kind of syntonic follow circuit, it include pre processing circuit 11, analog-digital converter the 12, first digital to analog converter, second
Resonance type optical fiber gyro digital phase moudlation device any one of digital to analog converter and Claims 1-4, wherein, pre-treatment electricity
Road is connected with the first multiplier in resonance type optical fiber gyro digital phase moudlation device and the second multiplier after analog-digital converter, the
One digital to analog converter and the second digital to analog converter are connected to the second low pass filtered of resonance type optical fiber gyro digital phase moudlation device
Ripple device and phase shifter.
A kind of resonance type optical fiber gyro digital phase moudlation method, the output of its analog-digital converter 12 utilizes the first multiplier 21 He
Second multiplier 22, is multiplied with cosine function look-up table means 20 and SIN function look-up table means 23 respectively, the first multiplier
21 and second the output of multiplier 22 respectively through the first low pass filter 24 and the second low pass filter 25, be input to phase meter
Calculating module 27, the output of phase difference calculating module 27 calculates the phase place between demodulated reference signal D23 and signal D12 to be demodulated
Difference, carries out time delay by the phase shifter 26 to the output of sinusoidal look-up table of functions module 23, thus changes modulated signal D26 and demodulation
Phase contrast between reference signal D23 because signal D12 to be demodulated be by modulated signal D26 through the second digital to analog converter 15,
Physical link that phase-modulator 3, fiber loop the 6, first photodetector 8 are formed and obtain so that letter to be demodulated
Number between D12 and modulated signal D26, there is fixing phase contrast, so by regulation modulated signal D26 and demodulated reference signal
Phase contrast between D23 just can change the phase contrast between demodulated reference signal D23 and signal D12 to be demodulated so that demodulation
Phase contrast between reference signal D23 and signal D12 to be demodulated goes to zero.
The output result of described phase difference calculating module 27 is according to the first obtained low pass filter and the second low pass filtered
The output of ripple device, calculates the phase contrast between demodulated reference signal and signal to be demodulated
Wherein, D27 is the phase contrast between demodulated reference signal and signal to be demodulated, and D24 is the first low pass filter
Output, D25 is the output of the second low pass filter.
Advantages of the present invention and providing the benefit that: the present invention is directed to fiber loop in resonance type optical fiber gyro quick to environment
Perception is high, and with temperature Rapid Variable Design, (under canonical parameter, every degree Celsius of resonance peak changes 1000 optical fiber resonance in resonance peak operating point
The free spectrum width of ring) feature, it is proposed that a kind of number based on analog-digital converter+field programmable gate array+digital to analog converter
Word phase modulation apparatus and phase modulation method.Described phase modulation method passes through closed loop feedback, can eliminate the creep effect institute of fiber loop
Phase contrast change between the demodulated reference signal brought and signal to be demodulated, it is possible at the phase demodulation electricity of resonance type optical fiber gyro
Road realizes the regulation of self adaptation phase contrast, thus improves the functional reliability of resonance type optical fiber gyro control circuit.
Accompanying drawing explanation
Fig. 1 is fiber loop frequency-tracking system schematic；
Wherein, 1-laser instrument, 2-fiber coupler, 3-phase-modulator, 4-optical fiber, 5-fiber coupler, 6-optical fiber is humorous
Shake ring, 7-fiber coupler, 8-the first photodetector, 9-the second photodetector, 10-syntonic follow circuit.
Fig. 2 is the theory diagram of syntonic follow circuit,
Wherein, 11-pre processing circuit, 12-analog-digital converter, 13-field programmable gate array, 14-the first digital-to-analogue conversion
Device, 15-the second digital to analog converter, 20-cosine function look-up table means, 21-the first multiplier, 22-the second multiplier, 23-is just
String look-up table of functions module, 24-the first low pass filter, 25-the second low pass filter, the 26-phase shifter, 27-phase difference calculating
Module, 28-proportional integral differential control link.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings:
Referring to Fig. 2, resonance type optical fiber gyro digital phase moudlation device of the present invention is mainly by pre processing circuit 11, analog digital conversion
Device 12, field programmable gate array the 13, first digital to analog converter 14 and the second digital to analog converter 15 form.
Programmable gate array 13 is internal at the scene, the signal gathered from analog-digital converter 12 and cosine function look-up table
Module 20 and SIN function look-up table means 23 are multiplied (utilizing the first multiplier 21 and the second multiplier 22) respectively, the first multiplication
The output of device 21 and the second multiplier 22, respectively through the first low pass filter 24 and the second low pass filter 25, enters phase contrast
Computing module 27.The output of phase difference calculating module 27 is according to the first obtained low pass filter 24 and the second low pass filter
The output of 25 calculates the phase contrast between demodulated reference signal D23 and signal D12 to be demodulated, thus is changed by the phase shifter 26
The phase shift momentum of SIN function look-up table means, and then change the phase contrast of modulated signal D26, because signal D12 to be demodulated
It is through the second digital to analog converter 15, phase-modulator 3, fiber loop the 6, first photodetector 8 institute by modulated signal D26
Composition physical link and obtain so that there is fixing phase contrast between signal D12 to be demodulated and modulated signal D26, make
The phase contrast obtained between demodulated reference signal D23 and signal D12 to be demodulated goes to zero.
Described cosine function look-up table means 20 and SIN function look-up table means 23, by field programmable gate array 13
Memory resource realize, cosine function look-up table means 20 stores in the range of 0～2 π equidistantly with array form
The cosine function value of the data point of distribution, stores the scope at 0～2 π with array form in SIN function look-up table means 23
The sine function of the interior equidistantly data point of distribution.
Described first multiplier 21 and the second multiplier 22, can be provided by the hardware multiplier in field programmable gate array 13
Source realizes, or field programmable gate array 13 is carried out hardware programming, by field-programmable gate array by hardware description language
Logical resource in row 13 realizes.
The value of the cut-off frequency of described first low pass filter 24 and the second low pass filter 25 should be by sinusoidal letter
In the 1/20～1/10 of the sinusoidal signal frequency stored in number look-up table means 23, with in the premise ensureing phase-detection precision
Under, it is to avoid introduce excessive time delay.
Described phase difference calculating module 27, the output according to the first low pass filter 24 and the second low pass filter 25 is advanced
After row division arithmetic, carrying out arctangent cp cp operation and draw, wherein division and arctangent cp cp operation programmable gate array 13 at the scene passes through
Hardware description language uses cordic algorithm (Coordinate Rotation Digital Computer, Coordinate Rotation Digital
Computational methods) realize, its formula is:
The core of syntonic follow circuit is phase demodulation (also referred to as coherent demodulation) circuit, and phase-sensitive demodulating circuits is important
One of regulating step is to realize the phase adjusted between demodulated reference signal and signal to be demodulated, is used for realizing described phase adjusted
Software and hardware be known as phase modulation apparatus.When syntonic follow circuit real work, described digital phase modulation circuit ensures demodulation reference
Signal D23 goes to zero with the phase contrast of signal D12 to be demodulated, so that the efficiency of phase-sensitive demodulating circuits is the highest, and then improves
The functional reliability of resonance type optical fiber gyro control circuit.
During resonance type optical fiber gyro digital phase moudlation method real work of the present invention, when demodulated reference signal D23 is with to be demodulated
When there is, between signal D12, the phase contrast fixed and be not zero, the calculated phase contrast of phase difference calculating module 27 is not
Zero, thus drive the phase shifter 26, change the phase contrast between modulated signal D26 and demodulated reference signal D23.Because of signal to be demodulated
D12 is through the second digital to analog converter 15, phase-modulator 3, fiber loop the 6, first photodetector by modulated signal D26
8 physical links formed and obtain, so there is fixing phase contrast between signal D12 to be demodulated and modulated signal D26.
The phase place between D12 and D23 just can be changed by the phase contrast between regulation modulated signal D26 and demodulated reference signal D23
Difference so that the phase contrast between demodulated reference signal D23 and signal D12 to be demodulated goes to zero.
Described digital phase moudlation method can not only be correct by the phase adjusted of phase-sensitive demodulating circuits when system initialization, with
Time, it is also possible in the whole work process of resonance type optical fiber gyro, on backstage in real time trace demodulation reference signal D23 with treat
The change of the phase contrast between demodulated signal D12, and carry out real-time feedback regulation.
Compared to traditional phase modulation means, the digital phase moudlation method simplicity that the present invention is introduced is easy-to-use, precision is high, Ke Yishi
Online phase adjusted during reality.
It addition, syntonic follow circuit of the present invention includes pre processing circuit 11, analog-digital converter the 12, first digital to analog converter
14, the second digital to analog converter 15 and resonance type optical fiber gyro digital phase moudlation device provide above.Wherein, pre-treatment electricity
Road 11 after analog-digital converter 12 with the first multiplier 21 and the second multiplier in resonance type optical fiber gyro digital phase moudlation device
22 connect, and the first digital to analog converter 14 and the second digital to analog converter 15 are connected to resonance type optical fiber gyro digital phase moudlation device
The second low pass filter 25 and the phase shifter 26.The syntonic follow circuit that the present invention is introduced is owing to have employed the number of closed loop feedback
Tone of Chinese characters phase method, it is possible to ensure that the efficiency of phase-sensitive demodulating circuits reaches maximum, thus improve resonance type optical fiber gyro control circuit
Functional reliability.
Claims (7)
1. a resonance type optical fiber gyro digital phase moudlation device, it is characterised in that include cosine function look-up table means, first take advantage of
Musical instruments used in a Buddhist or Taoist mass, the second multiplier, SIN function look-up table means, the first low pass filter, the second low pass filter, phase shifter, phase place
Difference computing module, wherein, the input of described first multiplier connects with analog-digital converter and cosine function look-up table means simultaneously
Connecing, its outfan is connected to phase difference calculating module through the first low pass filter, and the second multiplier input turns with modulus simultaneously
Parallel operation and SIN function look-up table means connect, and its outfan divides two-way one road to be connected to phase meter through the second low pass filter
Calculating module, another road is connected to the first digital to analog converter, simultaneously SIN function look-up table means outfan and phase difference calculating mould
Being also associated with the phase shifter between block, this phase shifter exports external second digital to analog converter.
Resonance type optical fiber gyro digital phase moudlation device the most according to claim 1, it is characterised in that described cosine function is looked into
Look for table module, the first multiplier, the second multiplier, SIN function look-up table means, the first low pass filter, the second low-pass filtering
Device, phase shifter, phase difference calculating module are all integrated on field programmable gate array.
Resonance type optical fiber gyro digital phase moudlation device the most according to claim 1, it is characterised in that described cosine function is looked into
Look for the storage resource that table module and SIN function look-up table means are based in field programmable gate array.
Resonance type optical fiber gyro digital phase moudlation device the most according to claim 1, it is characterised in that described first low pass filtered
The sinusoidal signal frequency that ripple device, the value of cut-off frequency of the second low pass filter are stored in by SIN function look-up table means
Within the scope of the 1/20～1/10 of rate.
5. a resonance type optical fiber gyro syntonic follow circuit, it is characterised in that include pre processing circuit (11), analog-digital converter
(12), the first digital to analog converter (14), the second digital to analog converter (15) and the resonant mode light any one of Claims 1-4
Fine gyro digital phase moudlation device, wherein, pre processing circuit after analog-digital converter with resonance type optical fiber gyro digital phase moudlation device
The first interior multiplier and the second multiplier connect, and the first digital to analog converter and the second digital to analog converter are connected to resonant mode
Second low pass filter of optical fibre gyro digital phase moudlation device and phase shifter.
6. a resonance type optical fiber gyro digital phase moudlation method, it is characterised in that the output of analog-digital converter (12) utilizes first
Multiplier (21) and the second multiplier (22), respectively with cosine function look-up table means (20) and SIN function look-up table means
(23) being multiplied, the output of the first multiplier (21) and the second multiplier (22) is low through the first low pass filter (24) and second respectively
Bandpass filter (25), is input to phase difference calculating module (27), and the output of phase difference calculating module (27) calculates demodulation reference
The phase contrast of signal (D23) and signal to be demodulated (D12), by defeated to sinusoidal look-up table of functions module (23) of phase shifter (26)
Go out and carry out time delay, thus change the phase contrast between modulated signal (D26) and demodulated reference signal (D23), because letter to be demodulated
Number (D12) be by modulated signal (D26) through the second digital to analog converter (15), phase-modulator (3), fiber loop (6),
Physical link that one photodetector (8) is formed and obtain so that signal to be demodulated (D12) and modulated signal (D26) it
Between there is fixing phase contrast, so by regulation modulated signal (D26) and demodulated reference signal (D23) between phase contrast just
The phase contrast between demodulated reference signal (D23) and signal to be demodulated (D12) can be changed so that demodulated reference signal (D23)
And the phase contrast between signal to be demodulated (D12) goes to zero.
Resonance type optical fiber gyro digital phase moudlation method the most according to claim 6, it is characterised in that described phase difference calculating
The output result of module is according to obtained the first low pass filter (24) and the output of the second low pass filter (25) and calculating
Go out the phase contrast between demodulated reference signal and signal to be demodulated
Wherein, D27 is the phase contrast between demodulated reference signal and signal to be demodulated, and D24 is the first low pass filter (24)
Output, D25 is the output of the second low pass filter (25).
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| CN113465630A (en) * | 2021-07-02 | 2021-10-01 | 浙江大学 | Optical resonant cavity free spectral line width online test system and method based on coherent demodulation |
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| CN108318020B (en) * | 2017-12-15 | 2021-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | Resonant mode fiber optic gyroscope resonant frequency tracking system based on pseudorandom signal |
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| CN113465630A (en) * | 2021-07-02 | 2021-10-01 | 浙江大学 | Optical resonant cavity free spectral line width online test system and method based on coherent demodulation |
| CN113465630B (en) * | 2021-07-02 | 2023-09-22 | 浙江大学 | Optical resonant cavity free spectral line width online test system and method based on coherent demodulation |
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