CN103267522B - The two-way frequency locking switching method of microwave gyroscope irreplaceable error is carried for eliminating light - Google Patents
The two-way frequency locking switching method of microwave gyroscope irreplaceable error is carried for eliminating light Download PDFInfo
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Abstract
The invention discloses a kind of two-way frequency locking switching method of carrying microwave gyroscope irreplaceable error for eliminating light.The method is by exchanging the part of devices and loop that produce irreplaceable error, the frequency of forward and reverse optical-electronic oscillator is alternately locked onto on high stability clock source, realize long the replacing in relative chamber in forward and reverse loop, thus reach the object compensating irreplaceable error.The method effectively can improve the precision that light carries microwave gyroscope.
Description
Technical field
The present invention relates to a kind of measuring technique, particularly relating to a kind of two-way frequency locking switching method of carrying microwave gyroscope irreplaceable error for eliminating light.
Background technology
In inertial navigation field, gyroscope is usually adopted to carry out the measurement of inertia angular velocity.Gyroscope is widely used in the Guidance and control such as spacecraft, aircraft, guided missile, submarine, naval vessel, and the precision measurement in the fields such as military affairs, industry, science plays an important role.Common high accuracy gyroscope instrument mainly contains three types: mechanical gyro, laser gyro and optical fibre gyro.Laser gyro and optical fibre gyro are all optical gyroscope, although degree of stability is no more than mechanical gyro, have compact conformation, sensitivity high, occupy most of market share of high accuracy gyroscope at present.
The principle of optical gyroscope detection angle speed is based on Sagnac effect.In closed light path, the light sent by same light source needs simultaneously along carrying out transmitted in both directions clockwise with counterclockwise.Because light path that is clockwise and counterclockwise loop is identical, the optical path difference that this two-beam produces only comes from angle change.Optical path difference will cause phase differential or difference on the frequency.Angular velocity detection is carried out by detected phase or difference on the frequency.
Light carries microwave gyroscope to be needed to realize two-way microwave resonance equally, thus carries out angular velocity detection by difference on the frequency.Do not have an independent amplifier can realize the Bi-directional amplifier of electric signal at present, therefore need use two covering device to realize two-way microwave resonance.Just there is the incomplete same problem in electric loop in the middle of this, thus introduce irreplaceable error, reduce the precision that light carries microwave gyroscope.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of two-way frequency locking switching method of carrying microwave gyroscope irreplaceable error for eliminating light is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of two-way frequency locking switching method, the method is carried in microwave gyroscope at light and is realized, the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument, beam splitter, first electrooptic modulator, first photo-coupler, frequency regulator, optic fiber ring-shaped cavity, second photo-coupler, first photodetector, first electrical filter, first microwave power distributor, first electric amplifier, second electrooptic modulator, second photodetector, second electrical filter, second microwave power distributor, second electric amplifier, difference frequency testing circuit, frequency divider, standard time source, phase detector, low-pass filter, one 2 × 2 photoswitch, 22 × 2 photoswitch.
The method comprises the following steps:
Step 1: before exchange, the light that laser instrument exports is through beam splitter, be divided into two-beam, light beam sends into the first electrooptic modulator along clockwise direction, light after ovennodulation enters the one 2 × 2 photoswitch, light enters the first photo-coupler by after the one 2 × 2 photoswitch, from first photo-coupler export light through frequency regulator laggard enter optic fiber ring-shaped cavity, the 22 × 2 photoswitch is entered through the second photo-coupler again from the light of ring cavity outgoing, then the first photodetector is entered, convert light signal to electric signal, send into the first electrical filter afterwards, filtered microwave telecommunication number sends into the first microwave power distributor, first microwave power distributor has two-way to export, the first via exports and is connected to the first electrooptic modulator through electric amplifier, form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit as RF.
Step 2: the another light beam that beam splitter separates sends into the second electrooptic modulator in the counterclockwise direction, through the one 2 × 2 photoswitch, optic fiber ring-shaped cavity is entered again through the second photo-coupler, from the light of ring cavity outgoing again through frequency regulator, first photo-coupler and the 22 × 2 photoswitch send into the second photodetector, convert light signal to electric signal, send into the second electrical filter afterwards, filtered microwave telecommunication number sends into the second microwave power distributor, second microwave power distributor has three tunnels to export, the first via exports and is connected to the second electrooptic modulator through the second electric amplifier, form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit as RF, 3rd tunnel exports and together send into phase detector with standard time source after frequency divider frequency division, phase demodulation exports and be connected to frequency regulator after low-pass filter, for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop.
Step 3: difference frequency testing circuit detects that the clockwise resonant microwave output RF#1 that step 1 obtains and the anticlockwise resonant microwave that step 2 obtains export the difference on the frequency of RF#2, is designated as
Step 4: after exchange, the one 2 × 2 photoswitch and the 22 × 2 photoswitch have exchanged the path of light simultaneously.Now clockwise first electrooptic modulator in loop, the first photodetector, the first electrical filter, the first microwave power distributor, the first electric amplifier become the ingredient in counterclockwise loop, and second electrooptic modulator in loop, the second photodetector, the second electrical filter, the second microwave power distributor, the second electric amplifier, frequency divider, standard time source, phase detector, low-pass filter become the ingredient in clockwise loop counterclockwise.Now, the difference on the frequency that difference frequency testing circuit 17 detects, is designated as
.
Step 5: the difference on the frequency obtained according to step 3
with the difference on the frequency that step 4 obtains
obtain angular velocity
:
Wherein,
for exchanging the angular velocity of pre-test,
for exchanging the angular velocity of rear measurement,
for fiber optic loop radius,
for the light velocity,
for loop length,
for
psubharmonic.
Object of the present invention also can be achieved through the following technical solutions: a kind of two-way frequency locking switching method, the method is carried in microwave gyroscope at light and is realized, the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument, beam splitter, first electrooptic modulator, first photo-coupler, frequency regulator, optic fiber ring-shaped cavity, second photo-coupler, first photodetector, first electrical filter, first microwave power distributor, first electric amplifier, second electrooptic modulator, second photodetector, second electrical filter, second microwave power distributor, second electric amplifier, difference frequency testing circuit, frequency divider, standard time source, phase detector, low-pass filter, one 2 × 2 microwave switch, 22 × 2 microwave switch.
Step 1: the light that laser instrument exports is through beam splitter, be divided into two-beam, light beam sends into the first electrooptic modulator along clockwise direction, enter the first photo-coupler again, from first photo-coupler export light through frequency regulator laggard enter optic fiber ring-shaped cavity, from the light of ring cavity outgoing again through the second photo-coupler, then the first photodetector is entered, convert light signal to electric signal, enter the 22 × 2 microwave switch afterwards, enter the first electrical filter again, filtered microwave telecommunication number sends into the first microwave power distributor, first microwave power distributor has two-way to export, the first via exports through electric amplifier, one 2 × 2 microwave switch, be connected to the first electrooptic modulator, form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit as RF.
Step 2: the another light beam that beam splitter separates sends into the second electrooptic modulator in the counterclockwise direction, optic fiber ring-shaped cavity is entered through the second photo-coupler, from the light of ring cavity outgoing again through frequency regulator, the second photodetector sent into by first photo-coupler, convert light signal to electric signal, enter the 22 × 2 microwave switch afterwards, enter the second electrical filter again, filtered microwave telecommunication number sends into the second microwave power distributor, second microwave power distributor has three tunnels to export, the first via exports through the second electric amplifier, one 2 × 2 microwave switch, be connected to the second electrooptic modulator, form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit as RF, 3rd tunnel exports and together send into phase detector with standard time source after frequency divider frequency division, phase demodulation exports and be connected to frequency regulator after low-pass filter, for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop.
Step 3: difference frequency testing circuit detects that the clockwise resonant microwave output RF#1 that step 1 obtains and the anticlockwise resonant microwave that step 2 obtains export the difference on the frequency of RF#2, is designated as
Step 4: the one 2 × 2 microwave switch and the 22 × 2 microwave switch have exchanged the path of light simultaneously.Now clockwise first electrical filter in loop, the first microwave power distributor, the first electric amplifier become the ingredient in counterclockwise loop, and second electrical filter in loop, the second microwave power distributor, the second electric amplifier, frequency divider, standard time source, phase detector, low-pass filter become the ingredient in clockwise loop counterclockwise.Now, the difference on the frequency that difference frequency testing circuit detects, is designated as
.
Step 5: the difference on the frequency obtained according to step 3
with the difference on the frequency that step 4 obtains
angular velocity is obtained by following formula
:
Wherein,
for exchanging the angular velocity of pre-test,
for exchanging the angular velocity of rear measurement,
for fiber optic loop radius,
for the light velocity,
for loop length,
for
psubharmonic.
The first exchanged form be carry out exchanging at opticator, the second exchanged form divides at electric department to exchange.
The first exchanged form can compensate the irreplaceable error of the first electrooptic modulator, the first photodetector, the first electrical filter, the first microwave power distributor, the first electric amplifier and the second electrooptic modulator, the second photodetector, the second electrical filter, the second microwave power distributor, the second electric amplifier part.The second exchanged form can compensate the irreplaceable error of the first electrical filter, the first microwave power distributor, the first electric amplifier and the second electrical filter, the second microwave power distributor, the second electric amplifier part.
Beneficial effect of the present invention is: by exchanging, compensate for the irreplaceable error that light carries microwave gyroscope, improve the measuring accuracy that light carries microwave gyroscope.
Accompanying drawing explanation
Fig. 1 is the schematic diagram before the two-way frequency locking switching method of the present invention changes photoswitch;
Fig. 2 is the schematic diagram before the two-way frequency locking switching method of the present invention changes microwave switch;
Fig. 3 is the schematic diagram after the two-way frequency locking switching method of the present invention changes photoswitch;
Fig. 4 is the schematic diagram after the two-way frequency locking switching method of the present invention changes microwave switch.
In figure, laser instrument 1, beam splitter 2, first electrooptic modulator 3, first photo-coupler 4, frequency regulator 5, optic fiber ring-shaped cavity 6, second photo-coupler 7, first photodetector 8, first electrical filter 9, first microwave power distributor 10, first electric amplifier 11, second electrooptic modulator 12, second photodetector 13, second electrical filter 14, second microwave power distributor 15, second electric amplifier 16, difference frequency testing circuit 17, frequency divider 18, standard time source 19, phase detector 20, low-pass filter 21, one 2 × 2 photoswitch 22, 22 × 2 photoswitch 23, one 2 × 2 microwave switch 24, 22 × 2 microwave switch 25.Bold portion represents that light path connects, and is light-path; Dotted portion indication circuit connects, and is electric pathway.
Embodiment
embodiment 1
Accompanying drawing 1 and accompanying drawing 3 are the first concrete embodiments.
Two-way frequency locking switching method of the present invention is carried in microwave gyroscope at light and is realized, the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument 1, beam splitter 2, first electrooptic modulator 3, first photo-coupler 4, frequency regulator 5, optic fiber ring-shaped cavity 6, second photo-coupler 7, first photodetector 8, first electrical filter 9, first microwave power distributor 10, first electric amplifier 11, second electrooptic modulator 12, second photodetector 13, second electrical filter 14, second microwave power distributor 15, second electric amplifier 16, difference frequency testing circuit 17, frequency divider 18, standard time source 19, phase detector 20, low-pass filter 21, one 2 × 2 photoswitch 22, 22 × 2 photoswitch 23.
The method comprises the following steps:
Step 1: as accompanying drawing 1, the light that laser instrument 1 exports is through beam splitter 2, be divided into two-beam, light beam sends into the first electrooptic modulator 3 along clockwise direction, light after ovennodulation enters the one 2 × 2 photoswitch 22, light enters the first photo-coupler 4 by after the one 2 × 2 photoswitch 22, from first photo-coupler 4 export light through frequency regulator 5 laggard enter optic fiber ring-shaped cavity 6, the 22 × 2 photoswitch 23 is entered through the second photo-coupler 7 again from the light of ring cavity outgoing, then the first photodetector 8 is entered, convert light signal to electric signal, send into the first electrical filter 9 afterwards, filtered microwave telecommunication number sends into the first microwave power distributor 10, first microwave power distributor 10 has two-way to export, the first via exports and is connected to the first electrooptic modulator 3 through electric amplifier 11, form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit 17 as RF.
Step 2: the another light beam that beam splitter 2 separates sends into the second electrooptic modulator 12 in the counterclockwise direction, through the one 2 × 2 photoswitch 22, optic fiber ring-shaped cavity 6 is entered again through the second photo-coupler 7, from the light of ring cavity outgoing again through frequency regulator 5, first photo-coupler the 4 and the 22 × 2 photoswitch 23 sends into the second photodetector 13, convert light signal to electric signal, send into the second electrical filter 14 afterwards, filtered microwave telecommunication number sends into the second microwave power distributor 15, second microwave power distributor 15 has three tunnels to export, the first via exports and is connected to the second electrooptic modulator 12 through the second electric amplifier 16, form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit 17 as RF, 3rd tunnel exports and together send into phase detector 20 with standard time source 19 after frequency divider 18 frequency division, phase demodulation exports and be connected to frequency regulator 5 after low-pass filter 21, for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop.
Step 3: difference frequency testing circuit 17 detects that the clockwise resonant microwave output RF#1 that step 1 obtains and the anticlockwise resonant microwave that step 2 obtains export the difference on the frequency of RF#2, is designated as
Step 4: as shown in Figure 3, the one 2 × 2 photoswitch the 22 and the 22 × 2 photoswitch 23 have exchanged the path of light simultaneously.Now clockwise first electrooptic modulator 3, first photodetector 8, first electrical filter 9, first microwave power distributor 10, first electric amplifier 11 in loop becomes the ingredient in counterclockwise loop, and second electrooptic modulator 12, second photodetector 13, second electrical filter 14, second microwave power distributor 15, second electric amplifier 16 in loop, frequency divider 18, standard time source 19, phase detector 20, low-pass filter 21 become the ingredient in clockwise loop counterclockwise.Now, the difference on the frequency that difference frequency testing circuit 17 detects, is designated as
.
Step 5: the difference on the frequency obtained according to step 3
with the difference on the frequency that step 4 obtains
obtain angular velocity
:
Under initial rest state, by using the equal cable of length, optical fiber carries out the mode that connects, ensures the same length in clockwise loop and counterclockwise loop, is designated as
.Before exchange, counterclockwise loop is subject to the adjustment of frequency regulator 5, and frequency is locked, and relative length keeps always
constant; The relative length in clockwise loop is then subject to true rotation, the adjustment of frequency regulator 5 and the impact of self loop change of cavity length and changes always.
The relative length chang that true rotation causes is designated as
:
Wherein:
for real motion angular velocity,
for fiber optic loop radius,
for the light velocity
The adjustment of frequency regulator 5 is divided into two parts: the compensation truly rotating the counterclockwise loop relative length chang caused, is similarly
; The compensation of counterclockwise loop change of cavity length, is designated as
.
Self clockwise loop change of cavity length, is designated as
.
Standard lock frequency counterclockwise in loop is:
Wherein:
for
psubharmonic
Frequency in clockwise direction loop is:
Close between difference on the frequency and angular velocity and be:
Formula (1) is brought into formula (4) and abbreviation obtains angular velocity is:
After exchange, clockwise loop is subject to the adjustment of frequency regulator 5, and frequency is locked, and relative length keeps always
constant; The length in counterclockwise loop is then subject to true rotation, the adjustment of frequency regulator 5 and the impact of self loop change of cavity length and changes always.
The same formula of the relative length chang that true rotation causes (1), is designated as
.
The adjustment of frequency regulator 5 is divided into two parts: the compensation truly rotating the clockwise loop relative length chang caused, is similarly
; The compensation (before namely exchanging counterclockwise loop change of cavity length) of clockwise loop change of cavity length, is designated as
.
Self is counterclockwise loop change of cavity length (before namely exchanging clockwise loop change of cavity length), is designated as
.
Standard lock frequency in clockwise direction loop is:
Frequency counterclockwise in loop is:.
Close between difference on the frequency and angular velocity and be:
Bring formula (1) into formula (8) and abbreviation obtains:
When exchange process carries out at a high speed, the change of cavity length between twice exchange is substantially constant, and the mean angular velocity before and after therefore exchanging is added by formula (5) and formula (9) and obtains:
The visible mode exchanged by two-way frequency locking, can compensate the irreplaceable error introduced because two way circuit causes the long difference in chamber.
embodiment 2
Accompanying drawing 2 and accompanying drawing 4 are the concrete embodiments of the second.
Two-way frequency locking switching method of the present invention is carried in microwave gyroscope at light and is realized, the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument 1, beam splitter 2, first electrooptic modulator 3, first photo-coupler 4, frequency regulator 5, optic fiber ring-shaped cavity 6, second photo-coupler 7, first photodetector 8, first electrical filter 9, first microwave power distributor 10, first electric amplifier 11, second electrooptic modulator 12, second photodetector 13, second electrical filter 14, second microwave power distributor 15, second electric amplifier 16, difference frequency testing circuit 17, frequency divider 18, standard time source 19, phase detector 20, low-pass filter 21, one 2 × 2 microwave switch 24, 22 × 2 microwave switch 25.
Step 1: as accompanying drawing 2, the light that laser instrument 1 exports is through beam splitter 2, be divided into two-beam, light beam sends into the first electrooptic modulator 3 along clockwise direction, enter the first photo-coupler 4 again, from first photo-coupler 4 export light through frequency regulator 5 laggard enter optic fiber ring-shaped cavity 6, from the light of ring cavity outgoing again through the second photo-coupler 7, then the first photodetector 8 is entered, convert light signal to electric signal, enter the 22 × 2 microwave switch 25 afterwards, enter the first electrical filter 9 again, filtered microwave telecommunication number sends into the first microwave power distributor 10, first microwave power distributor 10 has two-way to export, the first via exports through electric amplifier 11, one 2 × 2 microwave switch 24, be connected to the first electrooptic modulator 3, form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit 17 as RF.
Step 2: the another light beam that beam splitter 2 separates sends into the second electrooptic modulator 12 in the counterclockwise direction, optic fiber ring-shaped cavity 6 is entered through the second photo-coupler 7, from the light of ring cavity outgoing again through frequency regulator 5, the second photodetector 13 sent into by first photo-coupler 4, convert light signal to electric signal, enter the 22 × 2 microwave switch 25 afterwards, enter the second electrical filter 14 again, filtered microwave telecommunication number sends into the second microwave power distributor 15, second microwave power distributor 15 has three tunnels to export, the first via exports through the second electric amplifier 16, one 2 × 2 microwave switch 24, be connected to the second electrooptic modulator 12, form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit 17 as RF, 3rd tunnel exports and together send into phase detector 20 with standard time source 19 after frequency divider 18 frequency division, phase demodulation exports and be connected to frequency regulator 5 after low-pass filter 21, for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop.
Step 3: difference frequency testing circuit 17 detects that the clockwise resonant microwave output RF#1 that step 1 obtains and the anticlockwise resonant microwave that step 2 obtains export the difference on the frequency of RF#2, is designated as
Step 4: as shown in Figure 4, the one 2 × 2 microwave switch the 24 and the 22 × 2 microwave switch 25 have exchanged the path of light simultaneously.Now clockwise first electrical filter 9, first microwave power distributor 10, first electric amplifier 11 in loop becomes the ingredient in counterclockwise loop, and second electrical filter 14, second microwave power distributor 15, second electric amplifier 16 in loop, frequency divider 18, standard time source 19, phase detector 20, low-pass filter 21 become the ingredient in clockwise loop counterclockwise.Now, the difference on the frequency that difference frequency testing circuit 17 detects, is designated as
.
Step 5: the difference on the frequency obtained according to step 3
with the difference on the frequency that step 4 obtains
angular velocity is obtained by following formula
:
Wherein,
for exchanging the angular velocity of pre-test,
for exchanging the angular velocity of rear measurement,
for fiber optic loop radius,
for the light velocity,
for loop length,
for
psubharmonic.
The first embodiment be carry out exchanging at opticator, the second embodiment divides at electric department to exchange.
The first embodiment can compensate the irreplaceable error of the first electrooptic modulator 3, first photodetector 8, first electrical filter 9, first microwave power distributor 10, first electric amplifier 11 and the second electrooptic modulator 12, second photodetector 13, second electrical filter 14, second microwave power distributor 15, second electric amplifier 16 part.The second embodiment can compensate the irreplaceable error of the first electrical filter 9, first microwave power distributor 10, first electric amplifier 11 and the second electrical filter 14, second microwave power distributor 15, second electric amplifier 16 part.
Claims (2)
1. a two-way frequency locking switching method, is characterized in that, the method is carried in microwave gyroscope at the light eliminating irreplaceable error and realized, and the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument (1), beam splitter (2), first electrooptic modulator (3), first photo-coupler (4), frequency regulator (5), optic fiber ring-shaped cavity (6), second photo-coupler (7), first photodetector (8), first electrical filter (9), first microwave power distributor (10), first electric amplifier (11), second electrooptic modulator (12), second photodetector (13), second electrical filter (14), second microwave power distributor (15), second electric amplifier (16), difference frequency testing circuit (17), frequency divider (18), standard time source (19), phase detector (20), low-pass filter (21), one 2 × 2 photoswitch (22), 22 × 2 photoswitch (23), the method comprises the following steps:
Step 1: the light that laser instrument 1 exports is through beam splitter (2), be divided into two-beam, light beam sends into the first electrooptic modulator (3) along clockwise direction, light after ovennodulation enters the one 2 × 2 photoswitch (22), light enters the first photo-coupler (4) by after the one 2 × 2 photoswitch (22), the light exported from the first photo-coupler (4) through frequency regulator (5) laggard enter optic fiber ring-shaped cavity (6), the 22 × 2 photoswitch (23) is entered through the second photo-coupler (7) again from the light of ring cavity outgoing, then the first photodetector (8) is entered, convert light signal to electric signal, send into the first electrical filter (9) afterwards, filtered microwave telecommunication number sends into the first microwave power distributor (10), first microwave power distributor (10) has two-way to export, the first via exports and is connected to the first electrooptic modulator (3) through the first electric amplifier (11), form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit (17) as RF,
Step 2: the another light beam that beam splitter (2) separates sends into the second electrooptic modulator (12) in the counterclockwise direction, through the one 2 × 2 photoswitch (22), optic fiber ring-shaped cavity (6) is entered again through the second photo-coupler (7), from the light of ring cavity outgoing again through frequency regulator (5), first photo-coupler (4) and the 22 × 2 photoswitch (23) send into the second photodetector (13), convert light signal to electric signal, send into the second electrical filter (14) afterwards, filtered microwave telecommunication number sends into the second microwave power distributor (15), second microwave power distributor (15) has three tunnels to export, the first via exports and is connected to the second electrooptic modulator (12) through the second electric amplifier (16), form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit (17) as RF, 3rd tunnel exports and together send into phase detector (20) with standard time source (19) after frequency divider (18) frequency division, phase demodulation exports and be connected to frequency regulator (5) after low-pass filter (21), for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop,
Step 3: difference frequency testing circuit (17) detects that the clockwise RF output #1 that step 1 obtains and the anticlockwise RF that step 2 obtains exports the difference on the frequency of #2, is designated as Δ f
1
Step 4: the one 2 × 2 photoswitch (22) and the 22 × 2 photoswitch (23) have exchanged the path of light simultaneously, now first electrooptic modulator (3) in clockwise loop, first photodetector (8), first electrical filter (9), first microwave power distributor (10), first electric amplifier (11) becomes the ingredient in counterclockwise loop, and second electrooptic modulator (12) in counterclockwise loop, second photodetector (13), second electrical filter (14), second microwave power distributor (15), second electric amplifier (16), frequency divider (18), standard time source (19), phase detector (20), low-pass filter (21) becomes the ingredient in clockwise loop, now, the difference on the frequency that difference frequency testing circuit (17) detects, is designated as Δ f
2,
Step 5: the difference on the frequency Δ f obtained according to step 3
1with the difference on the frequency Δ f that step 4 obtains
2angular velocity Ω is obtained by following formula:
Wherein, Ω
1for exchanging the angular velocity of pre-test, Ω
2for exchanging the angular velocity of rear measurement, R is fiber optic loop radius, and C is the light velocity, and L is loop length, and p is p subharmonic.
2. a two-way frequency locking switching method, is characterized in that, the method is carried in microwave gyroscope at the light eliminating irreplaceable error and realized, and the light of described elimination irreplaceable error carries microwave gyroscope and comprises: laser instrument (1), beam splitter (2), first electrooptic modulator (3), first photo-coupler (4), frequency regulator (5), optic fiber ring-shaped cavity (6), second photo-coupler (7), first photodetector (8), first electrical filter (9), first microwave power distributor (10), first electric amplifier (11), second electrooptic modulator (12), second photodetector (13), second electrical filter (14), second microwave power distributor (15), second electric amplifier (16), difference frequency testing circuit (17), frequency divider (18), standard time source (19), phase detector (20), low-pass filter (21), one 2 × 2 microwave switch (24), 22 × 2 microwave switch (25),
Step 1: the light that laser instrument (1) exports is through beam splitter (2), be divided into two-beam, light beam sends into the first electrooptic modulator (3) along clockwise direction, enter the first photo-coupler (4) again, the light exported from the first photo-coupler (4) through frequency regulator (5) laggard enter optic fiber ring-shaped cavity (6), from the light of ring cavity outgoing again through the second photo-coupler (7), then the first photodetector (8) is entered, convert light signal to electric signal, enter the 22 × 2 microwave switch (25) afterwards, enter the first electrical filter (9) again, filtered microwave telecommunication number sends into the first microwave power distributor (10), first microwave power distributor (10) has two-way to export, the first via exports through the first electric amplifier (11), one 2 × 2 microwave switch (24), be connected to the first electrooptic modulator (3), form a positive feedback oscillation loop, second tunnel exports and exports #1 feeding difference frequency testing circuit (17) as RF,
Step 2: the another light beam that beam splitter (2) separates sends into the second electrooptic modulator (12) in the counterclockwise direction, optic fiber ring-shaped cavity (6) is entered through the second photo-coupler (7), from the light of ring cavity outgoing again through frequency regulator (5), the second photodetector (13) sent into by first photo-coupler (4), convert light signal to electric signal, enter the 22 × 2 microwave switch (25) afterwards, enter the second electrical filter (14) again, filtered microwave telecommunication number sends into the second microwave power distributor (15), second microwave power distributor (15) has three tunnels to export, the first via exports through the second electric amplifier (16), one 2 × 2 microwave switch (24), be connected to the second electrooptic modulator (12), form another positive feedback oscillation loop, second tunnel exports and exports #2 feeding difference frequency testing circuit (17) as RF, 3rd tunnel exports and together send into phase detector (20) with standard time source (19) after frequency divider (18) frequency division, phase demodulation exports and be connected to frequency regulator (5) after low-pass filter (21), for regulating resonance frequency, thus form a unidirectional Frequency-locked-loop,
Step 3: difference frequency testing circuit (17) detects that the clockwise RF output #1 that step 1 obtains and the anticlockwise RF that step 2 obtains exports the difference on the frequency of #2, is designated as Δ f
1
Step 4: the one 2 × 2 microwave switch (24) and the 22 × 2 microwave switch (25) have exchanged the path of light simultaneously; Now clockwise first electrical filter (9) in loop, the first microwave power distributor (10), the first electric amplifier (11) become the ingredient in counterclockwise loop, and second electrical filter (14) in loop, the second microwave power distributor (15), the second electric amplifier (16), frequency divider (18), standard time source (19), phase detector (20), low-pass filter (21) become the ingredient in clockwise loop counterclockwise; Now, the difference on the frequency that difference frequency testing circuit (17) detects, is designated as Δ f
2;
Step 5: the difference on the frequency Δ f obtained according to step 3
1with the difference on the frequency Δ f that step 4 obtains
2angular velocity Ω is obtained by following formula:
Wherein, Ω
1for exchanging the angular velocity of pre-test, Ω
2for exchanging the angular velocity of rear measurement, R is fiber optic loop radius, and C is the light velocity, and L is loop length, and p is p subharmonic.
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| CN103471579B (en) * | 2013-09-29 | 2016-02-17 | 浙江大学 | A kind of angular velocity detection method adopting two-way full reciprocity coupling light electrical oscillator |
| CN107084713B (en) * | 2017-05-26 | 2019-08-06 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| WO2020087422A1 (en) * | 2018-10-31 | 2020-05-07 | 浙江大学 | Polarization-maintaining fully-reciprocal bi-directional optical carrier microwave resonance system and angular velocity measurement method thereof |
| CN109357672B (en) * | 2018-10-31 | 2020-11-27 | 浙江大学 | Two-way optical carrier microwave resonance system based on circulator structure and method for detecting angular velocity of two-way optical carrier microwave resonance system |
| EP3875903B1 (en) * | 2018-10-31 | 2023-09-13 | Zhejiang University | Bidirectional optical-carrying microwave resonance system based on circulator structure and method for detecting angular velocity by said system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5636022A (en) * | 1994-07-29 | 1997-06-03 | Litton Systems, Inc. | Closed loop unmodulated fiber optic rate gyroscope with 3×3 coupler and method |
| US5777737A (en) * | 1994-07-22 | 1998-07-07 | Litton Systems, Inc. | Apparatus and method for processing signals output from fiber optic rate gyroscope having 3×3 coupler |
| CN101709971A (en) * | 2009-11-11 | 2010-05-19 | 哈尔滨工程大学 | Signal demodulating method for inhibiting vibration error of fiber optic gyro |
| CN102706340A (en) * | 2012-05-14 | 2012-10-03 | 北京大学 | Interference optical fiber gyroscope |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5926275A (en) * | 1997-06-19 | 1999-07-20 | Honeywell Inc. | Vibration error reduction servo for a fiber optic gyroscope |
-
2013
- 2013-05-10 CN CN201310171209.XA patent/CN103267522B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5777737A (en) * | 1994-07-22 | 1998-07-07 | Litton Systems, Inc. | Apparatus and method for processing signals output from fiber optic rate gyroscope having 3×3 coupler |
| US5636022A (en) * | 1994-07-29 | 1997-06-03 | Litton Systems, Inc. | Closed loop unmodulated fiber optic rate gyroscope with 3×3 coupler and method |
| CN101709971A (en) * | 2009-11-11 | 2010-05-19 | 哈尔滨工程大学 | Signal demodulating method for inhibiting vibration error of fiber optic gyro |
| CN102706340A (en) * | 2012-05-14 | 2012-10-03 | 北京大学 | Interference optical fiber gyroscope |
Non-Patent Citations (2)
| Title |
|---|
| Online effective backscattering estimation for ring laser gyro;Zhengfang Fan等;《Chinese Optics Letters》;20120510;全文 * |
| 消偏光纤陀螺的非互易性相位误差的研究;王淑敏等;《激光与红外》;20021031;第32卷(第5期);第336-338页 * |
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