CN109459010A - A kind of novel chopper circuit for fibre optic gyroscope - Google Patents
A kind of novel chopper circuit for fibre optic gyroscope Download PDFInfo
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- CN109459010A CN109459010A CN201811598020.8A CN201811598020A CN109459010A CN 109459010 A CN109459010 A CN 109459010A CN 201811598020 A CN201811598020 A CN 201811598020A CN 109459010 A CN109459010 A CN 109459010A
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- analog switch
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- pass filter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
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- Optics & Photonics (AREA)
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- Radar, Positioning & Navigation (AREA)
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- Gyroscopes (AREA)
Abstract
The invention belongs to fibre optic gyroscope fields；Specially a kind of novel chopper circuit for fibre optic gyroscope；The circuit includes the first high-pass filter, sampling hold circuit, pulse signal generator, the first analog switch, the second analog switch and the second high-pass filter；The output end of first high-pass filter is separately connected the first analog switch and sampling hold circuit；The output end of the sampling hold circuit connects the second analog switch；The pulse signal generator sends pulse signal to sampling hold circuit, the first analog switch and the second analog switch respectively；Second high-pass filter receives the signal from the first analog switch and the second analog switch；The present invention provides a kind of novel chopper circuit for digital closed-loop optic fiber gyroscope instrument, can thoroughly eliminate spike burr and make the straight no step of signal and mean value is zero, be very beneficial for the signal processing of subsequent conditioning circuit.Entire circuit composition is simple, high reliablity.
Description
Technical field
The present invention relates to the improvement of chopper circuit in fibre optic gyroscope, for removing spike in detector output signal
Interference, belongs to fibre optic gyroscope field；Specially a kind of novel chopper circuit for fibre optic gyroscope.
Background technique
Optical fibre gyro is a kind of to utilize the novel complete solid of Sagnac Sagnac effect sensitivity rotation angle or turning rate
State inertia type instrument, with all solid state, at low cost, miniaturization, the service life is long, dynamic range is big, the design of precision broad covered area, structure is clever
The many advantages such as work, simple production process are widely used in Aeronautics and Astronautics, navigation, terrestrial weapon system and industrial circle, are
One of most commonly used novel gyroscope of application range at present.
Fibre optic gyroscope is made of two parts of optical path and circuit.Optical path is mainly made of light source, Y waveguide, detector
Sagnac interferometer, circuit part is realized that interferometer signal extracts, angle rate signal demodulates and is integrated, modulated signal generates and rank
The functions such as terraced wave closed loop feedback.Interferometer signal, which is extracted, directly affects optical fiber gyroscope precision with angle rate signal demodulation, is optical fiber
One of gyro circuit system key technology.
Light wave is known as eigenfrequency in reciprocal 1/2 in propagation time in optical fibre gyro sensor coil.It is being based on square wave tune
In the digital closed-loop optic fiber gyroscope of system, the frequency of modulated square wave should be equal to the eigenfrequency of optical fibre gyro.When modulating frequency not
When equal to eigenfrequency, the equivalent voltage for having twice to be applied in optical waveguide in a cycle of modulated square wave is zero,
Light i.e. in this two sections of time inner fiber rings actually and is not affected by effective modulation, this twice are known as Ineffective modulation
Area shows as spike in the signal of optical power response.Detector carries out the signal exported after photoelectric conversion to optical signal
In just there is periodical spike signal, during the processing such as signal being amplified, being filtered, sharp cutting edge of a knife or a sword pulse can be broadened very
To saturation.Pulse broadening can enter effective carrier signal section and cause demodulating error, and pulse saturation will lead to operational amplifier work
Make abnormal.Therefore, to high-precision optical fiber gyro, it is usually necessary to use chopper circuits to be removed to spike, right to eliminate its
The influence of signal conditioning circuit.Common chopper circuit can introduce new signal station while being removed to sharp cutting edge of a knife or a sword pulse
Rank.The usual present invention provides a kind of new chopper circuit, directly cuts to what the eradicating efficacy of sharp cutting edge of a knife or a sword pulse was better than generalling use
Wave mode.
Summary of the invention
For the needs for meeting optical fibre gyro especially high precision fiber optic gyroscope, detector spike is solved to signal tune
The interference for managing circuit, overcomes the shortcomings of usual chopper circuit.It is an object of the invention to provide a kind of for fibre optic gyroscope
Novel chopper circuit.The configuration of the present invention is simple will not introduce new signal while eliminating detector point cutting edge of a knife or a sword impulse disturbances
Step.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of novel chopper circuit for fibre optic gyroscope, including the first high-pass filter, sampling hold circuit, pulse
Signal generator, the first analog switch, the second analog switch and the second high-pass filter；First high-pass filter it is defeated
Outlet is separately connected the first analog switch and sampling hold circuit；The second simulation of output end connection of the sampling hold circuit is opened
It closes；The pulse signal generator sends pulse letter to sampling hold circuit, the first analog switch and the second analog switch respectively
Number；Second high-pass filter receives the signal from the first analog switch and the second analog switch.
Further, the sampling hold circuit includes third analog switch, third sampling capacitance Ch and operation amplifier
Device；The input terminal of the sampling hold circuit is third analog switch, its output end is operational amplifier；Third sampling capacitance Ch
One end be connected between third analog switch and operational amplifier；And the other end is grounded.
Further, the pulse signal generator includes issuing the first pulse signal P1 and the second pulse signal P2；Institute
The first pulse signal is stated for controlling the opening and closing of third analog switch；Second pulse signal is for controlling the first analog switch
And second analog switch opening and closing.
Further, when the first pulse signal P1 of pulse signal generator is high level, third analog switch is connected,
The input signal of third analog switch charges to third sampling capacitance Ch, keeps the voltage of Ch equal with input signal；First pulse
When signal P1 is low level, third analog switch is disconnected, and the voltage on Ch is maintained at instantaneous before the second pulse signal P2 is lower
Voltage no longer changes；Voltage value in the output and Ch of operational amplifier is always consistent；To which output to the second simulation is opened
It closes.
Further, the chopper circuit includes that the first high-pass filter output signal is sent to the first analog switch, and first
Analog switch and the second analog switch are switched under the control of pulse signal generator；When the pulse signal generator
The conducting of the first analog switch, the second analog switch disconnect when second pulse signal P2 is high level, when second pulse signal
The first analog switch disconnects when P2 is low level, the second analog switch is connected.
Further, the second pulse signal P2 is low level during spike, is high during useful signal
Level；In the second pulse signal P2 between high period, the first analog switch conducting, useful signal passes through；Believe in the second pulse
Between low period, the first analog switch is disconnected by number P2, and spike can not pass through, and go to realize to the copped wave of spike
It removes.
Preferably, first high-pass filter includes that the first sampling capacitance C1 and first resistor R1 constitutes the filter of single order high pass
Wave device；Second high-pass filter includes that the second sampling capacitance C2 and second resistance R2 constitute single order high-pass filter, to cutting
Signal after wave carries out high-pass filtering again.
It is understood that the present invention can be not limited to the description above, art technology to the high-pass filter of use
Personnel can carry out corresponding accommodation according to the actual situation.
Compared to common chopping method, the invention has the following beneficial effects:
1, the present invention replaces ground connection using sampling hold circuit, and copped wave removal part is filled by useful signal, avoids letter
Number new step is generated, the mean value of signal is zero.Zero-mean signal is very beneficial for the enhanced processing and AD sampling of subsequent conditioning circuit.
2, the present invention extracts the bias voltage of useful signal with sampling hold circuit, during copped wave removes spike burr
Instead of 0 voltage generallyd use, so as to avoid new signal jump is generated；It realizes useful signal and is biased to 0, significantly favorably
In follow-up signal processing；.
3, the present invention is formed using analog circuit, at low cost, low in energy consumption, small in size, high reliablity；Thus the present invention is constituted
Circuit composition it is simple, practical, promoted convenient for a wide range of.
In short, the present invention provides a kind of novel chopper circuit for digital closed-loop optic fiber gyroscope instrument, spike can be thoroughly eliminated
Burr simultaneously makes the straight no step of signal and mean value is zero, is very beneficial for the signal processing of subsequent conditioning circuit.Entire circuit composition
Simply, high reliablity.
Detailed description of the invention
Fig. 1 is novel chopper circuit of the invention；
Fig. 2 is common chopper circuit；
Fig. 3 is two kinds of chopper circuit timing comparison schematic diagrams of the present invention with the prior art.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to of the invention real
The technical solution applied in example is clearly and completely described, it is clear that described embodiment is only that present invention a part is implemented
Example, instead of all the embodiments.
Embodiment 1
The invention proposes a kind of novel chopper circuits for fibre optic gyroscope, including the first high-pass filter, sampling
Holding circuit, pulse signal generator, the first analog switch, the second analog switch and the second high-pass filter；The circuit
Copped wave is carried out to sharp cutting edge of a knife or a sword pulse by the analog switch under pulse control, while useful signal is sampled and kept, finally
By being combined to each analog switch, realizing the removal to spike interference signal and useful signal being made to be 0 biasing.
Novel chopper circuit of the invention realizes that the process of spike removal may include as follows:
1) modulated signal of detector output eliminates most zero offset by the first high-pass filter；
2) the filtered signal of step 1 is respectively fed to the first analog switch and sampling hold circuit, sampling hold circuit
It is made of third analog switch, third sampling capacitance, operational amplifier.The control terminal of third analog switch and sampling hold circuit
The pulse signal sent by impulse generator is controlled.
3) output of the sampling hold circuit of step 2 is sent to the second analog switch, the output of the second analog switch and the 2nd
The output of first analog switch of step connects together.The ON/OFF logic of the two analog switches is opposite and is sent out by pulse signal
The same pulse signal i.e. the second pulse signal P2 control of raw device, alternately switching realizes that useful signal and sampling keep letter for they
Number splice and combine, thus realize spike removal and signal it is straight.
Embodiment 2
The present embodiment combines specific data, and novel chopper circuit of the invention is described further；The present invention is available
Spike in removal fibre optic gyroscope detector output signal；The present invention mainly may include four parts: the first high pass
Filter, chopping process, sampling is kept and the second high-pass filter；The novel chopper circuit include the first high-pass filter,
Sampling hold circuit, pulse signal generator, the first analog switch, the second analog switch and the second high-pass filter；Such as Fig. 1
It is shown.
A point is detector output signal i.e. this circuit input signal, and signal schematic representation is as shown in Figure 3.Useful letter in Fig. 3
It number is expressed as the curve of noise bounce, spike interference signal is indicated with ideal rectangle square wave.
First high-pass filtering part of the invention is further elaborated:
First sampling capacitance C1 and first resistor R1 constitutes single order high-pass filter.A curve can see from Fig. 3, visit
The useful signal or useful signal for surveying device output are not zero, and usually have a bias voltage.Signal is amplified in order to subsequent,
First high-pass filter is for eliminating the bias voltage or offset signal.
But due to the presence of spike burr, the B point signal after high-pass filtering is not zero offset, but has one
With the bias voltage Δ V of spike opposite direction.Such as B signal in Fig. 3, i.e. signal after blocking.
If the height of spike burr relative efficiency signal is Δ h, the duration is Δ t, period T.Then useful signal
Duration is T- Δ t.This signal with burr after the first high-pass filter, the mean value of signal be 0.That is:
Δ t ×-Δ V × (T- Δ t)=0 (Δ h- Δ V)
As it can be seen that useful signal can not achieve zero-mean after high-pass filtering, but deviate 0 due to the presence of spike burr
Voltage certain distance Δ V, its size are proportional to the height Δ h of accounting and spike in spike in cycle T；
Chopping process of the invention is described further:
As shown in Figure 1, the first high-pass filter output signal B is sent to the first analog switch SW1, the first analog switch SW1
It is switched under the control of pulse signal generator P2 with the second analog switch SW2.SW1 conducting, SW2 are disconnected when P2 is high level
It opens, SW1 is disconnected when P2 is low level, SW2 is connected.P2 is low level during spike, is high electricity during useful signal
It is flat.In P2 between high period, SW1 conducting, useful signal passes through.In P2 between low period, SW1 disconnect, spike without
Method passes through, to realize that the copped wave to spike removes.
In P2 between low period, SW2 conducting.The input end grounding of usual SW2, as shown in Figure 2.I.e. in spike quilt
During this of copped wave removal, C point exports 0 voltage, i.e. 0 voltage realizes the continuous of signal instead of spike.Due to height
Useful signal deviates 0 voltage Δ V, C point output signal and switchs to the low level th moment by high level in P2 after pass filter, by Δ V
Jump is 0 voltage.Signal still has spike, and only the relative altitude of spike is reduced by Δ h for Δ V.For high-precision top
For spiral shell, follow-up signal processing can still be impacted.
Present invention sampling hold circuit can thoroughly eliminate Δ V jump instead of the ground signalling of SW2 in Fig. 2.
Process is kept to be further elaborated sampling of the invention below:
Such as Fig. 1, ground signalling of the present invention sampling hold circuit instead of SW2 in Fig. 2.
Sampling hold circuit is made of third analog switch SW3, third sampling capacitance Ch, operational amplifier OP.Pulse letter
Number generator has increased the first pulse signal P1 newly.SW3 is connected when P1 is high level, and the input signal of SW3 is to third sampling capacitance
Ch charging, Ch capacitor very little can make in a short period of time the voltage of Ch equal with input signal.When P2 is low level,
SW3 is disconnected, and since operational amplifier OP input section impedance in the same direction below is very high, the charge on Ch will not be leaked, the voltage on Ch
The instantaneous voltage before P2 is lower is maintained at no longer to change.Operational amplifier OP is connected in voltage follower, in its output and Ch
Voltage value is always consistent.
As shown in figure 3, P1 becomes high level at the ts moment before P2 will be become the low level th moment from high level.
The purpose is to be sampled and held on Ch by the instantaneous level position Vs of useful signal.It arrives until the th moment.Such as preceding institute
It states, analog switch SW2 is connected after P2 becomes low level, and Vs signal appears in output end instead of spike.As C ' believes in Fig. 3
Number, which is expressed as the signal after copped wave and samples signal obtained by the signal after keeping is overlapped.
Since Vs comes from useful signal, average value is equal with the average bias voltage Δ V of useful signal.
For the second high-pass filter capacitor, the second sampling capacitance C2 and second resistance R2 constitute single order high-pass filtering
Device carries out high-pass filtering to the signal after copped wave again.For the C point signal of usual chopper circuit output shown in Fig. 2, filtering
Useful signal is not still 0 voltage afterwards.Signal is put for the C ' of novel chopper circuit output of the invention shown in Fig. 1, partially due to it
It sets continuous and is Δ V, Δ V will become 0 voltage after high-pass filtering.It, will be only right when subsequent conditioning circuit amplifies the signal
Useful signal amplifies, and biasing remains 0, is very beneficial for high-precision optical fiber gyro to the processing requirement of signal.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Embodiment provided above has carried out further detailed description, institute to the object, technical solutions and advantages of the present invention
It should be understood that embodiment provided above is only the preferred embodiment of the present invention, be not intended to limit the invention, it is all
Any modification, equivalent substitution, improvement and etc. made for the present invention, should be included in the present invention within the spirit and principles in the present invention
Protection scope within.
Claims (7)
1. a kind of novel chopper circuit for fibre optic gyroscope, including the first high-pass filter, sampling hold circuit, pulse letter
Number generator, the first analog switch, the second analog switch and the second high-pass filter；It is characterized in that, first high pass
The output end of filter is separately connected the first analog switch and sampling hold circuit；The output end of the sampling hold circuit connects
Second analog switch；The pulse signal generator is respectively to sampling hold circuit, the first analog switch and the second analog switch
Send pulse signal；Second high-pass filter receives the signal from the first analog switch and the second analog switch.
2. a kind of novel chopper circuit for fibre optic gyroscope according to claim 1, which is characterized in that the sampling
Holding circuit includes third analog switch, third sampling capacitance Ch and operational amplifier；The input of the sampling hold circuit
End is third analog switch, its output end is operational amplifier；One end of third sampling capacitance Ch is connected to third analog switch
Between operational amplifier；And the other end is grounded.
3. a kind of novel chopper circuit for fibre optic gyroscope according to claim 2, which is characterized in that the pulse
Signal generator includes issuing the first pulse signal P1 and the second pulse signal P2；First pulse signal is for controlling third
The opening and closing of analog switch；Second pulse signal is used to control the opening and closing of the first analog switch and the second analog switch.
4. a kind of novel chopper circuit for fibre optic gyroscope according to claim 3, which is characterized in that when pulse is believed
Third analog switch is connected when first pulse signal P1 of number generator is high level, and the input signal of third analog switch is to the
Three sampling capacitance Ch charging, keeps the voltage of Ch equal with input signal；When first pulse signal P1 is low level, third simulation is opened
Shutdown is opened, and the voltage on Ch, which is maintained at the instantaneous voltage before the second pulse signal P2 is lower, no longer to be changed；Operational amplifier it is defeated
It is always consistent with the voltage value on Ch out；To output to the second analog switch.
5. a kind of novel chopper circuit for fibre optic gyroscope according to claim 3, which is characterized in that the copped wave
Circuit includes that the first high-pass filter output signal is sent to the first analog switch, and the first analog switch and the second analog switch are in arteries and veins
It rushes under the control of signal generator and is switched；When the second pulse signal P2 of the pulse signal generator is high level the
The conducting of one analog switch, the second analog switch disconnect, and when the second pulse signal P2 is low level, the first analog switch is disconnected
It opens, the conducting of the second analog switch.
6. a kind of novel chopper circuit for fibre optic gyroscope according to claim 5, which is characterized in that described second
Pulse signal P2 is low level during spike, is high level during useful signal；It is height in the second pulse signal P2
During level, the first analog switch conducting, useful signal passes through；In the second pulse signal P2 between low period, the first simulation
Switch disconnects, and spike can not pass through, to realize that the copped wave to spike removes.
7. a kind of novel chopper circuit for fibre optic gyroscope according to claim 1, which is characterized in that described first
High-pass filter includes that the first sampling capacitance C1 and first resistor R1 constitutes single order high-pass filter；Second high-pass filter
Single order high-pass filter is constituted including the second sampling capacitance C2 and second resistance R2, high pass filter is carried out again to the signal after copped wave
Wave.
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| CN201811598020.8A CN109459010B (en) | 2018-12-26 | 2018-12-26 | Novel chopper circuit for optical fiber gyroscope |
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| CN201811598020.8A CN109459010B (en) | 2018-12-26 | 2018-12-26 | Novel chopper circuit for optical fiber gyroscope |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045952A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Polarization maintaining fiber-optic gyroscope and peak removing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045952A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Polarization maintaining fiber-optic gyroscope and peak removing method thereof |
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