CN100554883C - A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope - Google Patents

A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope Download PDF

Info

Publication number
CN100554883C
CN100554883C CNB2007101176203A CN200710117620A CN100554883C CN 100554883 C CN100554883 C CN 100554883C CN B2007101176203 A CNB2007101176203 A CN B2007101176203A CN 200710117620 A CN200710117620 A CN 200710117620A CN 100554883 C CN100554883 C CN 100554883C
Authority
CN
China
Prior art keywords
signal
filtering
channel interference
square
processing apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2007101176203A
Other languages
Chinese (zh)
Other versions
CN101071068A (en
Inventor
宋凝芳
潘雄
杜士森
马东营
徐小斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beihang University
Original Assignee
Beihang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beihang University filed Critical Beihang University
Priority to CNB2007101176203A priority Critical patent/CN100554883C/en
Publication of CN101071068A publication Critical patent/CN101071068A/en
Application granted granted Critical
Publication of CN100554883C publication Critical patent/CN100554883C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Gyroscopes (AREA)

Abstract

The invention discloses a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, this co-channel interference method of testing is by the light source drive voltage signal to light source driving circuit, f 3Disturb, the signal after the interference is after light source, coupling mechanism, Y waveguide, fiber optic loop, again through photodetector conversion Output optical power signal f 1, with the square-wave signal f of Y waveguide 2With reference to input, adopt trivial phase amplification principle as signal to optical power signals f 1Square-wave signal f with Y waveguide 2Resolve and obtain noise amplitude signal f 4Realized optimization to interference type optical fiber gyroscope output information.

Description

A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope
Technical field
The present invention relates to a kind of method of testing that interference is handled to signal, more particularly say, be meant a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope.
Background technology
Interference type optical fiber gyroscope is a kind of instrument of measured angular speed, and its hardware comprises light source 1, coupling mechanism 2, Y waveguide 3, fiber optic loop 4, photodetector 5 and signal processing apparatus 6 compositions (seeing also shown in Figure 1).Described signal processing apparatus 6 comprises the optical power signals f that is used for photodetector 5 outputs 1Put filtering circuit 61, A/D converter 62, center processor 63, D/A converter 64 before carrying out that filtering amplifies and amplify modulate circuit 65 and form (seeing also shown in Figure 2).The center reason device 63 can be realized by DSP, also can be realized by FPGA, also can be realized by DSP+FPGA.Interference type optical fiber gyroscope to the measurement of angular velocity be by the two bundles light in opposite directions in fiber optic loop 4, propagated in the rotation of optical fibre gyro self, the non-reciprocal phase extent that causes characterizes.Gyro is responsive device with respect to the inertial space angular motion.It is used to measure the attitude angle and the angular velocity of carrier as a kind of important inertial sensor, is the core devices that constitutes inertia system.Can be applied in aircraft navigation, ship navigation and land with in the navigation.
In the interference type optical fiber gyroscope ring interferometer, 1/2nd of the difference inverse in group's transmission time of the two-way light path of light wave between Y waveguide 3 and coupling mechanism 2 is called the eigenfrequency (eigen frequency) of optical fibre gyro.The response of the luminous power of optical fibre gyro minimum reciprocal structure is the cosine function of a protuberance, in order to obtain higher sensitivity, so apply a biasing to this signal, makes it to be operated near the non-vanishing point of response slope.And the parasitic non-linear or Modulation and Amplitude Modulation in the Y waveguide 3 may weaken the quality of biasing.Under Y waveguide 3 nonlinear situations, a kind of simple solution is that optical fibre gyro ring is operated on the eigenfrequency (or its odd harmonic), and therefore, the signal processing apparatus 6 of optical fibre gyro all is based on its eigenfrequency usually and designs its control timing.
Summary of the invention
The objective of the invention is to propose a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, this co-channel interference method of testing is by the light source drive voltage signal f to light source driving circuit 3Disturb, the signal after the interference is after light source, coupling mechanism, Y waveguide, fiber optic loop, again through photodetector conversion Output optical power signal f 1, with the square-wave signal f of Y waveguide 2With reference to input, adopt trivial phase amplification principle as signal to optical power signals f 1Square-wave signal f with Y waveguide 2Resolve and obtain noise amplitude signal f 4Realized optimization to interference type optical fiber gyroscope output information.
The present invention is a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, and the analyzing step of 7 pairs of described signal processing apparatus 6 internal informations of co-channel interference parsing module has:
The first step: produce the square-wave signal f that is used to drive Y waveguide 3 by center processor 63 2
Second step: produce the voltage signal f that is used for driving light source driving circuit 11 by center processor 63 3
The 3rd step: the optical power signals f of photodetector 5 outputs 1After before putting filtering circuit 61, A/D converter 62, enter center processor 63;
The 4th step: the optical power signals f of 7 pairs of receptions of co-channel interference parsing module 1With square-wave signal f 2Carry out the co-channel interference dissection process, obtain noise amplitude signal f 4
The 5th step: 7 pairs of noise amplitude signals of co-channel interference parsing module f 4After analyzing, to voltage signal f 3Compensate, thereby optimize optical fibre gyro output information.
Described co-channel interference parsing module 7 mainly includes signalling channel, reference channel, walkaway passage; The optical power signals f of photodetector 5 outputs 1, obtain detected signal f through A amplifier 71, wave filter 72, B amplifier 73 1-1Square-wave signal f 2Obtain the first reference signal f through trigger 74, phase-shifter 75,76 phase shifts of C amplifier after amplifying 2-1Square-wave signal f 2Through trigger 74, the E amplifier second reference signal f that obtains after 80s 2-2The first reference signal f 2-1With the second reference signal f 2-2Respectively with detected signal f 1-1Behind multiplier 77, obtain the first AC signal V M1With the second AC signal V M2The first AC signal V M1After filtering, filter out AC signal wherein and obtain DC filtering signal V M1+FILT, the second AC signal V M2After filtering, filter out AC signal wherein and DC filtering signal V after obtaining phase shift M2+FILTWith DC filtering signal V M1+FILTWith phase shift DC filtering signal V M2+FILTAsk mould optimization to obtain noise amplitude signal f 4
The present invention is the method for the inner co-channel interference of a kind of measuring optical fiber gyro, and its advantage is: (one) can effectively measure the situation that detector signal after the opto-electronic conversion is subjected to co-channel interference; (2) use square-wave signal that signal processing apparatus itself sends as the reference signal, can effectively measure noise amplitude; (3) signal processing is through Filtering Processing, and measuring accuracy is higher.
Description of drawings
Fig. 1 is the structured flowchart of interference type optical fiber gyroscope in the background technology.
Fig. 2 is the structured flowchart of the signal processing apparatus of interference type optical fiber gyroscope in the background technology.
Fig. 3 is the analytic structure block diagram of center processor of the present invention to signal.
Fig. 4 is the Analytic principle block diagram of co-channel interference resolution unit of the present invention.
Among the figure: 1. light source 11. light source driving circuits 2. coupling mechanism 3.Y waveguides
4. put filtering circuit before fiber optic loop 5. photodetectors 6. signal processing apparatus 61.
62.A/D converter 63. center processor 64.D/A converters 65. amplify modulate circuit
7. co-channel interference resolution unit 71.A amplifier 72.A wave filter
73.B amplifier 74. triggers 75. phase-shifter 76.C amplifiers
77. multiplier 78.B wave filter 79.D amplifier 80.E amplifier
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, this kind measuring method can be measured the interference between the homogenous frequency signal of interference type optical fiber gyroscope inside effectively, and the actual conditions (referring to shown in Figure 2) of analog interferometric optical fibre gyro inside (signal processing apparatus 6) effectively, promptly center processor 63 is provided for the voltage signal f of driving light source driving circuit 11 for light source 1 3, light source driving circuit 11 provides drive current for light source 1, and 4 decay enter photodetector 5 to the light signal that light source 1 sends through fiber optic loop; The light that sends from fiber optic loop 4 is put filtering circuit 61 before entering through opto-electronic conversion.Center processor 63 is by square-wave signal f 2Input f with photodetector 5 signals 1(also being meant the optical power signals of photodetector 5 outputs) is with square-wave signal f 2Be benchmark, the amplitude size that measuring light electric explorer 5 output signals are disturbed.Use co-channel interference method of testing of the present invention and realized optimization interference type optical fiber gyroscope output information.
The present invention is a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, is the parsing of adopting 7 pairs of described signal processing apparatus 6 internal informations of co-channel interference parsing module, includes the following step:
The first step: produce the square-wave signal f that is used to drive Y waveguide 3 by center processor 63 2
Second step: produce the voltage signal f that is used for driving light source driving circuit 11 by center processor 63 3
The 3rd step: the optical power signals f of photodetector 5 outputs 1After before putting filtering circuit 61, A/D converter 62, enter center processor 63;
The 4th step: the optical power signals f of 7 pairs of receptions of co-channel interference parsing module 1With square-wave signal f 2Carry out the co-channel interference dissection process, obtain noise amplitude signal f 4
The 5th step: 7 pairs of noise amplitude signals of co-channel interference parsing module f 4After analyzing, to voltage signal f 3Compensate, thereby optimize optical fibre gyro output information.
See also shown in Figure 2, in the present invention, the voltage signal f of co-channel interference parsing module 7 output 3Affact output constant current signal in back on the light source driving circuit 11, the optical information of light source 1 output obtains optical power signals f by photodetector 5 after coupling mechanism 2, Y waveguide 3, fiber optic loop 4 1Optical power signals f 1With the square-wave signal f that drives Y waveguide 2In co-channel interference parsing module 7, carry out the parsing of co-channel interference; Undesired signal is to drive by light source, become light signal by electrical signal conversion, convert electric signal to by light signal again through detector 5, the reference signal of electric signal and 6 outputs of gyro signal treatment circuit is input to two input ends (referring to shown in Figure 3) of co-channel interference parsing module 7 respectively, by the amplitude of trivial phase amplifier measuring noise signal.The amplitude of measuring-signal changes the size that size has reflected noise signal.The variation of co-channel interference signal amplitude can cause the variation of measurement result amplitude, therefore can be by result's variation of co-channel interference signal as can be seen of co-channel interference parsing module 7 measurements.
See also shown in Figure 4ly, co-channel interference parsing module 7 mainly includes signalling channel, reference channel, walkaway passage.The optical power signals f of photodetector 5 outputs 1, obtain detected signal f through A amplifier 71, wave filter 72, B amplifier 73 1-1Square-wave signal f 2Obtain the first reference signal f through trigger 74, phase-shifter 75,76 phase shifts of C amplifier after amplifying 2-1Square-wave signal f 2Through trigger 74, the E amplifier second reference signal f that obtains after 80s 2-2The first reference signal f 2-1With the second reference signal f 2-2Respectively with detected signal f 1-1Behind multiplier 77, obtain the first AC signal V M1With the second AC signal V M2The first AC signal V M1After filtering, filter out AC signal wherein and obtain DC filtering signal V M1+FILT, the second AC signal V M2After filtering, filter out AC signal wherein and DC filtering signal V after obtaining phase shift M2+FILTWith DC filtering signal V M1+FILTWith phase shift DC filtering signal V M2+FILTAsk mould optimization to obtain noise amplitude signal f 4
Described signalling channel to the am signals of input amplify, processing such as filtering.Because detected weak output signal, and accompanied by noise is relatively large, and this just requires the prime amplifier of signalling channel must possess the characteristics of low noise, high-gain, and dynamic range wants big.
The function of described reference channel is to provide control signal with detected signal coherence for multiplier.With reference to input is square-wave signal, and its frequency is the same with the noise signal of wishing detection.
In the present invention, the input of co-channel interference parsing module 7 requires to have a reference frequency, i.e. square-wave signal f 2Co-channel interference parsing module 7 is measured measured signal by reference frequency; The hypothetical reference signal is a square-wave signal, and its frequency is ω RCo-channel interference parsing module 7 is output as sinusoidal signal, and the response of supposing sinusoidal signal is V ISin (ω IT+ θ I), V wherein IThe amplitude of expression photodetector 5 outputs.
Co-channel interference parsing module 7 is measuring-signal and reference signal V RSin (ω RT+ θ R) multiply each other, multiplier 77 has two input ends, an output terminal.
V M1＝f 1-1×f 2-1 (1)
Through being converted to: V M 1 = 1 2 V I V R cos ( θ R - θ I ) + 1 2 V I V R sin ( 2 ω R t + θ R + θ I ) - - - ( 2 )
Because two input ends of co-channel interference parsing module 7 have identical frequency, first of the output of multiplier 77 is DC quantity; Second is that frequency is 2 ω RAC signal, this signal can fall by low pass filter filters out.Obtain DC filtering signal V M1+FILT:
V M 1 + FILT = 1 2 V I V R cos ( θ R - θ I ) - - - ( 3 )
Amplitude V for 5 outputs of measuring light electric explorer I, we utilize formula 3, and under the situation that the phase differential of input signal and reference signal must be known, we are the amplitude V of energy measurement input signal just in other words IIt is through the later signal of phase shift that co-channel interference parsing module 7 addresses this problem the signal that has adopted multiplier, reference signal to be input to multiplier 77:
V M 2 = 1 2 V I V R cos ( θ R - θ I - π 2 ) + 1 2 V I V R sin ( 2 ω R t + θ R + θ I - π 2 ) - - - ( 4 )
Through after the filtering:
V M 2 + FILT = 1 2 V I V R cos ( θ R - θ I - π 2 ) = 1 2 V I V R sin ( θ R - θ I ) - - - ( 5 )
Therefore the mould optimization of asking by above formula obtains noise amplitude signal f 4:
f 4 = ( 2 V R ) ( V M 1 + FILT ) 2 + ( V M 2 + FILT ) 2 - - - ( 6 )
Co-channel interference method of testing of the present invention is by the light source drive voltage signal f to light source driving circuit 3Disturb, the signal after the interference is after light source, coupling mechanism, Y waveguide, fiber optic loop, again through photodetector conversion Output optical power signal f 1, with the square-wave signal f of Y waveguide 2With reference to input, adopt trivial phase amplification principle as signal to optical power signals f 1Square-wave signal f with Y waveguide 2Resolve and obtain noise amplitude signal f 4Realized optimization to interference type optical fiber gyroscope output information.
The physical significance of quotation mark sees the following form in the present invention:
f 1 Expression is by the optical power signals of photodetector 5 outputs.f 1=V ISin (ω RT+ θ I)
f 1-1 Expression optical power signals f 1The detected signal that is used for multiplier 77 inputs after filtering is amplified.
f 2 The square-wave signal that is used to drive Y waveguide 3 that expression is produced by center processor 63.f 2=V RSin (ω RT+ θ R)
f 2-1 Expression square-wave signal f 2First reference signal that is used for multiplier 77 inputs after phase shift is amplified.
f 2-2 Expression square-wave signal f 2Second reference signal that is used for multiplier 77 inputs after amplifying.
f 3 The voltage signal that is used for driving light source driving circuit 11 that expression is produced by center processor 63.
f 4 The optical power signals f of 63 pairs of receptions of expression center processor 1With square-wave signal f 2Carry out the noise amplitude signal that obtains after the co-channel interference dissection process.
V M1 Represent detected signal f 1-1With the first reference signal f 2-1First AC signal of output after in multiplier 77, multiplying each other.
V M2 Represent detected signal f 1-1With the second reference signal f 2-2Second AC signal of output after in multiplier 77, multiplying each other.
t The time of expression photodetector 5 outputs, unit: second S.
V I The amplitude of expression photodetector 5 outputs.
V R Expression square-wave signal f 2The amplitude of input.
θ I The phase place of expression photodetector 5 outputs, unit: radian rad.
θ R Expression square-wave signal f 2The input phase place, unit: radian rad.
ω I The frequency of expression photodetector 5 outputs, unit: hertz Hz.
ω R Expression square-wave signal f 2Frequency, unit: hertz Hz.ω I=ω R
V M1+FILT Expression DC filtering signal.
V M2+FILT Expression is through the DC filtering signal of phase shift.

Claims (2)

1, a kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope, put filtering circuit (61), A/D converter (62), center processor (63), D/A converter (64) before described signal processing apparatus (6) includes at least and amplify modulate circuit (65), it is characterized in that: co-channel interference parsing module (7) has the analyzing step of described signal processing apparatus (6) internal information:
The first step: produce the square-wave signal f that is used to drive Y waveguide (3) by center processor (63) 2
Second step: produce the voltage signal f that is used for driving light source driving circuit (11) by center processor (63) 3
The 3rd step: the optical power signals f1 of photodetector (5) output enters center processor (63) after before putting filtering circuit (61), A/D converter (62);
The 4th step: the optical power signals f of co-channel interference parsing module (7) to receiving 1With square-wave signal f 2Carry out the co-channel interference dissection process, obtain noise amplitude signal f 4
The 5th step: co-channel interference parsing module (7) is to noise amplitude signal f 4After analyzing, to voltage signal f 3Compensate, thereby optimize optical fibre gyro output information; Co-channel interference parsing module (7) mainly includes signalling channel, reference channel, walkaway passage; The optical power signals f of photodetector (5) output 1, obtain detected signal f through A amplifier (71), wave filter (72), B amplifier (73) 1-1Square-wave signal f 2Obtain the first reference signal f through trigger (74), phase-shifter (75), C amplifier (76) phase shift after amplifying 2-1Square-wave signal f 2The second reference signal f that behind trigger (74), E amplifier (80), obtains 2-2The first reference signal f 2-1With the second reference signal f 2-2Respectively with detected signal f 1-1Behind multiplier (77), obtain the first AC signal V M1With the second AC signal V M2The first AC signal V M1After filtering, filter out AC signal wherein and obtain DC filtering signal V M1+FILT, the second AC signal V M2After filtering, filter out AC signal wherein and DC filtering signal V after obtaining phase shift M2+FILTWith DC filtering signal V M1+FILTWith phase shift DC filtering signal V M2+FILTAsk mould optimization to obtain noise amplitude signal f 4
2, the co-channel interference method of testing of signal processing apparatus according to claim 1 is characterized in that: ask mould to optimize noise amplitude signal f 4Satisfy
Figure C2007101176200002C1
In the formula, V RExpression square-wave signal f 2The amplitude of input, V M1+FILTExpression DC filtering signal, V M2+FILTExpression phase shift DC filtering signal.
CNB2007101176203A 2007-06-20 2007-06-20 A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope Expired - Fee Related CN100554883C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2007101176203A CN100554883C (en) 2007-06-20 2007-06-20 A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2007101176203A CN100554883C (en) 2007-06-20 2007-06-20 A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope

Publications (2)

Publication Number Publication Date
CN101071068A CN101071068A (en) 2007-11-14
CN100554883C true CN100554883C (en) 2009-10-28

Family

ID=38898401

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2007101176203A Expired - Fee Related CN100554883C (en) 2007-06-20 2007-06-20 A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope

Country Status (1)

Country Link
CN (1) CN100554883C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110986912B (en) * 2019-12-13 2021-09-17 西安航天精密机电研究所 Signal processing circuit signal interference detection method, storage medium and computer device
CN110987014B (en) * 2019-12-13 2024-02-23 西安航天精密机电研究所 Signal interference detection method for fiber-optic gyroscope signal processing circuit, storage medium and computer equipment
CN110987010B (en) * 2019-12-13 2021-10-22 西安航天精密机电研究所 Signal interference detection method, computer storage medium and computer equipment
CN112407325B (en) * 2020-11-10 2022-03-29 北京航空航天大学 Instruction exciter for evaluating seaworthiness conformity of civil aircraft stability control characteristic
CN116086496B (en) * 2023-03-31 2023-06-20 中国船舶集团有限公司第七〇七研究所 Method and system for improving sensitivity of integrated fiber optic gyroscope

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
光纤陀螺随机调制的理论分析及实验. 张晞等.北京航空航天大学学报，第32卷第2期. 2006
光纤陀螺随机调制的理论分析及实验. 张晞等.北京航空航天大学学报，第32卷第2期. 2006 *

Also Published As

Publication number Publication date
CN101071068A (en) 2007-11-14

Similar Documents

Publication Publication Date Title
Dandridge et al. Homodyne demodulation scheme for fiber optic sensors using phase generated carrier
Sun et al. Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer
US10162245B2 (en) Distributed acoustic sensing system based on delayed optical hybrid phase demodulator
CN102353393B (en) Quadrature demodulation device for interference type photo-sensor based on pi/2 phase modulation
CN101713701B (en) Heterodyne technology based device and method for testing half-wave voltage of phase modulator
US20110174078A1 (en) FIBER-OPTIC, DIGITAL SYSTEM FOR LASER DOPPLER VIBROMETERS (LDVs)
CN100458367C (en) Four-state modulation and demodulation method for automatically tracking optical fiber gyro 2pai voltage
CN105067103A (en) Vibration detection device and method based on optical frequency domain reflectometer
CN100554883C (en) A kind of co-channel interference method of testing that is applicable to the signal processing apparatus of interference type optical fiber gyroscope
CN111609918A (en) Optical fiber distributed vibration sensing system based on envelope detection circuit
CN101464166B (en) Optical fiber distributed perturbation sensor and method for implementing perturbation positioning
CN108534686B (en) Zero-drift-free heterodyne laser Doppler measurement optical fiber light path and measurement method
CN1851403A (en) Looped optical-frequency detection apparatus of resonance type micro-light electromechanical gyro
CN113447110A (en) Distributed optical fiber vibration sensing system and phase carrier demodulation method thereof
CN100541127C (en) Adopt the asymmetrical square wave modulator approach to measure the method for interference type optical fiber gyroscope eigenfrequency
CN106907997A (en) A kind of displacement measurement signal analysis method based on optic fiber displacement sensor system
CN111307270B (en) Distributed optical fiber sensing system for improving vibration measurement sensitivity
Yu et al. Distributed optical fiber vibration sensing using phase-generated carrier demodulation algorithm
CN104457961B (en) The fibre-optical sensing device and method that a kind of vibrational waveform measures simultaneously with position
Li et al. Interferometric vibration sensor using phase-generated carrier method
CN205120239U (en) Vibration detection device based on optical frequency domain reflectometer
CN102607547A (en) Digital domain balanced detecting method and device for optical fiber gyroscope
Rzasa et al. Long-range vibration detection system using heterodyne interferometry
CN107328404B (en) Oversized Sagnac interference type fiber-optic gyroscope with N-multiplied effective fiber-optic length
CN1945209B (en) Combined modulating and demodulating method for inhibiting optic fiber gyroscope cross interference

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: General aviation (Beijing) Photoelectric Technology Co Ltd

Assignor: Beihang University

Contract record no.: 2010110000215

Denomination of invention: Co-channel interference measuring method of signal processing device for interference optical fiber gyroscope

Granted publication date: 20091028

License type: Exclusive License

Open date: 20071114

Record date: 20101227

EE01 Entry into force of recordation of patent licensing contract

Assignee: Aviation Gyro (Beijing) Photoelectricity Technology Co., Ltd.

Assignor: Beihang University

Contract record no.: 2010110000215

Denomination of invention: Same frequency interference test method for signal processing device of interferometric fiber optic gyroscope

Granted publication date: 20091028

License type: Exclusive license

Open date: 20071114

Record date: 20101227

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20091028

Termination date: 20190620