CN106918814A - Ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM - Google Patents
Ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM Download PDFInfo
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- CN106918814A CN106918814A CN201710283808.9A CN201710283808A CN106918814A CN 106918814 A CN106918814 A CN 106918814A CN 201710283808 A CN201710283808 A CN 201710283808A CN 106918814 A CN106918814 A CN 106918814A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM, belong to laser ranging field.Solve traditional FM/CW laser radar modulation bandwidths limited, it is difficult to improve the problem of range accuracy.Modulated terminal of the present invention collectively forms signal modulating system to produce scalariform frequency modulated signal light using the optical fiber circuit that single-frequency continuous wave laser, double parallel MZM and optical fiber laser amplifier are constituted with adjustable F P optical fiber filters, and signal modulation bandwidth is up to the GHz of tens GHz to hundred；Receiving terminal is resolved using centroid algorithm to target echo, and utilizes the principle of double balance detections to suppress the errors of principles that scalariform frequency modulated signal brings, and further improves system range accuracy.Found range present invention is mainly used for measured target.
Description
Technical field
The invention belongs to laser ranging field.
Background technology
The height that CW with frequency modulation (frequency-modulated continuous-wave, FM/CW) laser radar has
The resolution of ranging high that signal modulation bandwidth is brought, and it is not high to the bandwidth requirement of detector and analog-digital converter (ADCS)
Feature, is increasingly becoming a kind of important Detecting System.
But the continuous improvement due to practical application to resolution requirement, to the modulation bandwidth of FM/CW laser radar systems
Demand is also improved constantly, and the electronic bandwidth limitation that the laser modulator and its driver for using at present are driven signal source cannot
Further improve, the limitation of modulation bandwidth is increasingly becoming the technical bottleneck that FM/CW laser radars improve range accuracy.
The content of the invention
The present invention is limited in order to solve traditional FM/CW laser radar modulation bandwidths, it is difficult to improve asking for range accuracy
Topic, the invention provides a kind of ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM.Mach-increase Dare
Modulator (Mach-Zehnder modulator, MZM).
Ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM, it includes single-frequency continuous wave laser, 3
Individual 2 × 1 coupler, 41 × 2 beam splitters, double parallel MZM, optical fiber laser amplifier, Tunable Fabry-Perot Filter, optical circulator, light
Fine self-focusing collimater, No. 1 photodetector, No. 2 photodetectors, analog-digital converter and digital signal processors；
32 × 1 couplers are respectively defined as No. 12 × 1 couplers, No. 22 × 1 couplers and No. 32 × 1 couplers；
41 × 2 beam splitters are respectively defined as No. 11 × 2 beam splitter, No. 21 × 2 beam splitters, No. 31 × 2 beam splitters and No. 4
1 × 2 beam splitter, and No. 11 × 2 beam splitter, No. 21 × 2 beam splitters and No. 3 equal beams of output intensity identical two of 1 × 2 beam splitter
Light；
The continuous light of single-frequency continuous wave laser output and the light of optical fiber laser amplifier output, through No. 12 × 1 coupler couplings
After conjunction, double parallel MZM is incident to, after the frequency of coupling light of the double parallel MZM to receiving is translated, and through No. 11 × 2 beam splitting
Device is split, and obtains two-beam；
Wherein, after light beam carries out power amplification through optical fiber laser amplifier, No. 12 × 1 couplers are incident to；
Another light beam is incident to after Tunable Fabry-Perot Filter is filtered, and after being split through No. 41 × 2 beam splitters, is obtained
Two-beam, the two-beam is respectively flashlight and local oscillator light, and flashlight light intensity of the light intensity more than local oscillator light；
After flashlight sequentially passes through optical circulator and optical fiber self-focusing collimater, measured target is incident to, measured target is anti-
The echo-signal light penetrated is incident to No. 31 × 2 beam splitters through optical circulator, and No. 31 × 2 beam splitters enter to the echo-signal light for receiving
Row beam splitting, two beam echo-signal light of acquisition are incident to No. 22 × 1 couplers and No. 32 × 1 couplers respectively；
Local oscillator light obtains two beam local oscillator light after No. 21 × 2 beam splitter beam splitting, wherein, a branch of local oscillator light passes through tunable optical
After fine delay line time delay, No. 22 × 1 couplers are incident to, another Shu Benzhen light is incident to No. 32 × 1 couplers；
After No. 22 × 1 couplers are coupled to the local oscillator light and a branch of echo-signal light after the time delay of reception, 1 is incident to
Number photodetector carries out photoelectric conversion,
After No. 32 × 1 couplers are coupled to the local oscillator light for receiving and another beam echo-signal light, No. 2 photoelectricity are incident to
Detector carries out photoelectric conversion,
After No. 1 photodetector and the electric signal of No. 2 photodetector outputs carry out analog-to-digital conversion through analog-digital converter, obtain
The data-signal for obtaining is input into digital signal processor, and digital signal processor is processed the data-signal for receiving, so that
Obtain the distance of measured target.
Described digital signal processor is processed the data-signal for receiving, so that obtain the distance of measured target
Detailed process is：
Step one, digital signal processor (12) carry out Fourier transformation and intermediate frequency filtering to the data-signal for receiving, and obtain
The heterodyne signal frequency spectrum of local oscillator time delay must be introducedWith the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delayAnd draw
Enter the heterodyne signal frequency spectrum of local oscillator time delayWith the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delayBy N number of
Sinc functions are constituted, and the amplitude of described N number of sinc functions forms two sinc function envelopes, and N is more than and equal to 10
Integer；
Step 2, the heterodyne signal frequency spectrum for extracting introducing local oscillator time delayIn two amplitudes of sinc function envelopes
Maximum A1f-And A1f+, and amplitude maximum A1f-And A1f+The corresponding crest frequency f of difference1-And f1+, and f1+>f1-, A1f+>A1f-；
Similarly, the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delay is extractedIn two amplitude maximums of sinc function envelopes
A2f-And A2f+, and amplitude maximum A2f-And A2f+The corresponding crest frequency f of difference2-And f2+, and f2+>f2-, A2f+>A2f-；
Step 3, by crest frequency f1-, crest frequency f1+, amplitude maximum A1f-With amplitude maximum A1f+It is updated to public affairs
Barycenter resolving is carried out in formula one, reference distance value R is obtained1；
By crest frequency f2-, crest frequency f2+, amplitude maximum A2f-With amplitude maximum A2f+It is updated in formula two
Row barycenter is resolved, and obtains measurement distance value R2；
Wherein, c represents the light velocity, t0Time interval is represented, △ f represent that frequency modulation(PFM) is spaced；
Step 4, by reference distance value R1With measurement distance value R2In substituting into following formula three, so as to obtain measured target
Actual distance value Rreal；
Rreal=(R1+R2-cτL/ 2)/2 (formula three),
Wherein, τLRepresent the phase delay time of local oscillator light.
The light of described Tunable Fabry-Perot Filter output is the signal of the stepped change of frequency.
The drive signal that described double parallel MZM is received is sine voltage signal.
The drive signal that described Tunable Fabry-Perot Filter is received is stepwise voltage signal.
The beneficial effect that the present invention brings is：
1st, modulated terminal using single-frequency continuous laser source, double parallel MZM and optical fiber laser amplifier constitute optical fiber circuit with
Adjustable F-P optical fiber filters collectively form signal modulating system to produce scalariform frequency modulated signal, and signal modulation bandwidth is reachable
The GHz of tens GHz to hundred.
2nd, receiving terminal is resolved using centroid algorithm to target echo, and suppresses scalariform frequently using double flat weighing apparatus detecting module
The errors of principles that rate modulated signal is brought, further improves system range accuracy, and wherein double flat weighing apparatus detecting module includes No. 22 × 1
Coupler and No. 32 × 1 couplers, No. 21 × 2 beam splitters, No. 31 × 2 beam splitters, No. 1 photodetector, No. 2 photodetectors
And analog-digital converter.
3rd, full light path element uses fiber optic component.
4th, the present invention can effectively improve frequency modulated signal bandwidth, and then improve the range accuracy of system；Simultaneity factor
Element uses fiber optic components, and system light path belongs to flexible optical circuit, and the stability of a system is good, and integrated level is high.
5th, because system resolution of ranging △ R and system modulation bandwidth B meet following relation：
Thus, it can be known that system resolution of ranging is inversely proportional with laser frequency-modulation scope, and traditional CW with frequency modulation laser radar
Modulating bandwidth is limited to, therefore its resolution of ranging is limited, and the present invention is by using single-frequency continuous laser source+double parallel
The signal modulating system that the optical fiber circuit that MZM and fiber amplifier are constituted+adjustable F-P optical fiber filters are constituted, its swept frequency range
Significantly increase and controllable, therefore the present invention can effectively strengthen resolution of ranging.
Brief description of the drawings
Fig. 1 is the principle of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM of the present invention
Schematic diagram.
Fig. 2 is double parallel MZM and the structural representation of the loop configuration of optical fiber laser amplifier composition.
Fig. 3 is the principle schematic of double flat weighing apparatus detecting module.
Fig. 4 is the heterodyne signal frequency spectrum for introducing local oscillator time delaySpectrogram.
Specific embodiment
Specific embodiment one：Illustrate present embodiment referring to Fig. 1, described in present embodiment based on double parallel MZM's
Ultra wide band scalariform FM/CW laser radar range systems, it include 1,32 × 1 couplers of single-frequency continuous wave laser, 41 × 2 point
Beam device, double parallel MZM3, optical fiber laser amplifier 5, Tunable Fabry-Perot Filter 6, optical circulator 7, optical fiber self-focusing collimater 8,1
Number photodetector 9, No. 2 photodetectors 10, analog-digital converter 11 and digital signal processors 12；
32 × 1 couplers are respectively defined as No. 12 × 1 coupler 2-1, No. 22 × 1 coupler 2-2 and No. 32 × 1 couplings
Device 2-3；
41 × 2 beam splitters are respectively defined as No. 11 × 2 beam splitter 4-1, No. 21 × 2 beam splitter 4-2, No. 31 × 2 beam splitting
Device 4-3 and No. 41 × 2 beam splitter 4-4, and No. 11 × 2 beam splitter 4-1, No. 21 × 2 beam splitter 4-2 and No. 31 × 2 beam splitter 4-3
Equal output intensity identical two-beam；
The continuous light of the output of single-frequency continuous wave laser 1 and the light of the output of optical fiber laser amplifier 5, through No. 12 × 1 couplers
After 2-1 couplings, double parallel MZM3 is incident to, after the frequency of coupling light of the double parallel MZM3 to receiving is translated, and through No. 11
× 2 beam splitter 4-1 are split, and obtain two-beam；
Wherein, after light beam carries out power amplification through optical fiber laser amplifier 5, No. 12 × 1 coupler 2-1 are incident to；
Another light beam is incident to after Tunable Fabry-Perot Filter 6 is filtered, and is split through No. 41 × 2 beam splitter 4-4
Afterwards, obtain two-beam, the two-beam is respectively flashlight and local oscillator light, and flashlight light intensity of the light intensity more than local oscillator light；
After flashlight sequentially passes through optical circulator 7 and optical fiber self-focusing collimater 8, measured target, measured target are incident to
The echo-signal light of reflection is incident to No. 31 × 2 beam splitter 4-3 through optical circulator 7, and No. 31 × 2 beam splitter 4-3 are returned to reception
Ripple flashlight is split, and two beam echo-signal light of acquisition are incident to No. 22 × 1 coupler 2-2 and No. 32 × 1 couplings respectively
Device 2-3；
Local oscillator light obtains two beam local oscillator light after No. 21 × 2 beam splitter 4-2 beam splitting, wherein, a branch of local oscillator light is by adjustable
After the time delay of fiber delay line 13, No. 22 × 1 coupler 2-2 are incident to, another Shu Benzhen light is incident to No. 32 × 1 coupler 2-3；
It is incident after No. 22 × 1 coupler 2-2 are coupled to the local oscillator light and a branch of echo-signal light after the time delay of reception
Photoelectric conversion is carried out to No. 1 photodetector 9,
After No. 32 × 1 coupler 2-3 are coupled to the local oscillator light for receiving and another beam echo-signal light, No. 2 are incident to
Photodetector 10 carries out photoelectric conversion,
No. 1 photodetector 9 and the electric signal of No. 2 outputs of photodetector 10 carry out analog-to-digital conversion through analog-digital converter 11
Afterwards, the data-signal of acquisition is input into digital signal processor 12, and the data-signal of 12 pairs of receptions of digital signal processor is carried out
Treatment, so as to obtain the distance of measured target.
Principle analysis：The frequency of the output of single-frequency continuous wave laser 1 is f0Continuous light, it is incoming by double parallel MZM3 and optical fiber
The loop configuration that laser amplifier 5 is constituted, referring specifically to Fig. 2, the loop configuration is used for producing the frequency displacement of carrier-suppressed SSB
The frequency comb that signal is constituted.It is the sine voltage signal of △ f that the drive signal of double parallel MZM 3 is incident to for frequency, and is divided
It is, with 90 ° of two parts of phase difference, to be separately input to two modulator ports of double parallel MZM 3, it is suitable by setting
Bias, carrier wave is suppressed and laser energy focuses on upper side band, and the centre frequency of upper side band is f0+△f.Through the list of ovennodulation
Sideband signals are divided into two parts：A part is input to next system architecture, and another part is then by optical fiber laser amplifier 5
Double parallel MZM 3 is returned to after amplification, into next circulation.By after a series of circulation, the output signal of modulator loop is just
Form a series of frequency combs with △ f as frequency interval.
The optical signal of the outputs of double parallel MZM 3 needs to process after filtering.Therefore, one can be set behind modulator loop
The frequency comb of 6 pairs of generations of the Tunable Fabry-Perot Filter that the individual drive signal by scalariform function is driven chronologically is filtered successively,
Stepped time interval finally be can obtain for t0, light modulating signal of the stair-stepping frequency modulation(PFM) at intervals of △ f.
In ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM 3 of the present invention, each optics
Part is connected by single-mode polarization maintaining fiber realization, it is ensured that flashlight and local oscillator light, linear frequency modulation light and single-frequency laser it
Preceding polarization direction is identical, improves heterodyne efficiency, and then improve the detection performance of system.
Specific embodiment two：Present embodiment is illustrated referring to Fig. 1, described in present embodiment and specific embodiment one
The difference of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM is, described digital signal processor
The data-signal of 12 pairs of receptions is processed, so that the detailed process for obtaining the distance of measured target is：
Step one, the data-signal of 12 pairs of receptions of digital signal processor carry out Fourier transformation and intermediate frequency filtering, obtain
Introduce the heterodyne signal frequency spectrum of local oscillator time delayWith the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delay
Step 2, the heterodyne signal frequency spectrum for extracting introducing local oscillator time delayTwo crest frequency f1-、f1+And peak value
Frequency f1-Corresponding amplitude A1f-With crest frequency f1+Corresponding amplitude A1f+, similarly, extraction is not introduced into the outer of local oscillator time delay
The frequency spectrum of difference signalTwo crest frequency f2-、f2+And crest frequency f2-Corresponding amplitude A2f-With crest frequency f2+
Corresponding amplitude A2f+；
Step 3, by crest frequency f1-, crest frequency f1+, amplitude A1f-With amplitude A1f+Being updated in formula one carries out matter
The heart is resolved, and obtains reference distance value R1；
By crest frequency f2-, crest frequency f2+, amplitude A2f-With amplitude A2f+Being updated in formula two carries out barycenter resolving,
Obtain measurement distance value R2；
Wherein, c represents the light velocity, t0Time interval is represented, △ f represent that frequency modulation(PFM) is spaced；
Step 4, by reference distance value R1With measurement distance value R2In substituting into following formula three, so as to obtain measured target
Actual distance value Rreal；
Rreal=(R1+R2-cτL/ 2)/2 (formula three),
Wherein, τLRepresent the phase delay time of local oscillator light.
Present embodiment, Tunable Fabry-Perot Filter 6 is split by 1 × 2 beam splitter 4-1, is divided into flashlight and local oscillator
Light, flashlight by after the beam-expanding collimation of optical fiber self-focusing collimater 8, being irradiated to measured target, through measured target reflect after, target
Through No. 2 photodetectors 10, local oscillator light, through No. 1 photodetector 9, and the two result of detection is passed through echo-signal after time delay
It is input into after analog-to-digital conversion to digital signal processor 12, the data-signal of 12 pairs of receptions of digital signal processor carries out Fourier's change
The spectrum information for changing and after intermediate frequency filtering, obtaining Fig. 4, can just be calculated using centroid algorithm target range laser radar away from
From.
In Fig. 4, laser radar system is influenced whether with the phase difference between two frequency components being included in each frequency spectrum
Range accuracy, and inference this influence has periodic, and and surrounding is two difference frequencies of frequency component, i.e. △ f, therefore this
Invention employs a set of double flat weighing apparatus detecting module as shown in Figure 3 receiving terminal, and double flat weighing apparatus detecting module includes No. 22 × 1
Coupler 2-2 and No. 32 × 1 coupler 2-3, No. 21 × 2 beam splitter 4-2, No. 31 × 2 beam splitter 4-3, No. 1 photodetector 9,
No. 2 photodetectors 10 and analog-digital converter 11；And detect local oscillator light by No. 1 photodetector 9 and No. 2 photodetectors 10
With the intermediate frequency difference frequency signal in echo-signal, the purpose for setting double balance detection moulds is to eliminate phase difference to of the present invention
The detection accuracy of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM.
Specific embodiment three：Present embodiment is illustrated referring to Fig. 1, described in present embodiment and specific embodiment one
The difference of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM is, described Tunable Fabry-Perot Filter 6
The light of output is the signal of the stepped change of frequency.
Specific embodiment four：Present embodiment is illustrated referring to Fig. 1, described in present embodiment and specific embodiment one
The difference of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM is that described double parallel MZM3 is received
Drive signal be sine voltage signal.
Specific embodiment five：Present embodiment is illustrated referring to Fig. 1, described in present embodiment and specific embodiment one
The difference of the ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM is, described Tunable Fabry-Perot Filter 6
The drive signal of reception is stepwise voltage signal.
Claims (5)
1. the ultra wide band scalariform FM/CW laser radar range systems of double parallel MZM are based on, it is characterised in that it includes that single-frequency connects
Continuous laser (1), 32 × 1 couplers, 41 × 2 beam splitters, double parallel MZM (3), optical fiber laser amplifier (5), adjustable F-
P wave filters (6), optical circulator (7), optical fiber self-focusing collimater (8), No. 1 photodetector (9), No. 2 photodetectors
(10), analog-digital converter (11) and digital signal processor (12)；
32 × 1 couplers are respectively defined as No. 12 × 1 coupler (2-1), No. 22 × 1 couplers (2-2) and No. 32 × 1 couplings
Device (2-3)；
41 × 2 beam splitters are respectively defined as No. 11 × 2 beam splitter (4-1), No. 21 × 2 beam splitters (4-2), No. 31 × 2 beam splitting
Device (4-3) and No. 41 × 2 beam splitters (4-4), and No. 11 × 2 beam splitter (4-1), No. 21 × 2 beam splitters (4-2) and No. 31 × 2
Beam splitter (4-3) output intensity identical two-beam；
The continuous light of single-frequency continuous wave laser (1) output and the light of optical fiber laser amplifier (5) output, through No. 12 × 1 couplers
After (2-1) coupling, double parallel MZM (3) is incident to, after the frequency of coupling light of the double parallel MZM (3) to receiving is translated, and
It is split through No. 11 × 2 beam splitter (4-1), obtains two-beam；
Wherein, after light beam carries out power amplification through optical fiber laser amplifier (5), it is incident to No. 12 × 1 coupler (2-1)；
Another light beam is incident to after Tunable Fabry-Perot Filter (6) is filtered, and is split through No. 41 × 2 beam splitters (4-4)
Afterwards, obtain two-beam, the two-beam is respectively flashlight and local oscillator light, and flashlight light intensity of the light intensity more than local oscillator light；
After flashlight sequentially passes through optical circulator (7) and optical fiber self-focusing collimater (8), measured target, measured target are incident to
The echo-signal light of reflection is incident to No. 31 × 2 beam splitters (4-3), No. 31 × 2 beam splitter (4-3) docking through optical circulator (7)
The echo-signal light of receipts is split, and two beam echo-signal light of acquisition are incident to No. 22 × 1 couplers (2-2) and No. 32 respectively
× 1 coupler (2-3)；
Local oscillator light obtains two beam local oscillator light after the beam splitting of No. 21 × 2 beam splitters (4-2), wherein, a branch of local oscillator light passes through tunable optical
After the time delay of fine delay line (13), No. 22 × 1 couplers (2-2) are incident to, another Shu Benzhen light is incident to No. 32 × 1 couplers
(2-3)；
After No. 22 × 1 couplers (2-2) couple to the local oscillator light and a branch of echo-signal light after the time delay of reception, it is incident to
No. 1 photodetector (9) carries out photoelectric conversion,
After No. 32 × 1 couplers (2-3) couple to the local oscillator light for receiving and another beam echo-signal light, No. 2 light are incident to
Electric explorer (10) carries out photoelectric conversion,
No. 1 photodetector (9) and No. 2 electric signals of photodetector (10) output carry out modulus and turn through analog-digital converter (11)
After change, the data-signal of acquisition is input into digital signal processor (12), and digital signal processor (12) is believed the data for receiving
Number processed, so as to obtain the distance of measured target.
2. ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM according to claim 1, it is special
Levy and be, described digital signal processor (12) is processed the data-signal for receiving, thus obtain measured target away from
From detailed process be：
Step one, digital signal processor (12) carry out Fourier transformation and intermediate frequency filtering to the data-signal for receiving, and are drawn
Enter the heterodyne signal frequency spectrum of local oscillator time delayWith the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delayAnd introduce this
Shake the heterodyne signal frequency spectrum of time delayWith the frequency spectrum of the heterodyne signal for being not introduced into local oscillator time delayBy N number of sinc letters
Number is constituted, and the amplitude of described N number of sinc functions forms two sinc function envelopes, and N is the integer more than and equal to 10；
Step 2, the heterodyne signal frequency spectrum for extracting introducing local oscillator time delayIn two amplitude maximums of sinc function envelopes
Value A1f_And A1f+, and amplitude maximum A1f_And A1f+The corresponding crest frequency f of difference1-And f1+, and f1+>f1-, A1f+>A1f_；Together
Reason, extraction is not introduced into the frequency spectrum of the heterodyne signal of local oscillator time delayIn two amplitude maximums of sinc function envelopes
A2f_And A2f+, and amplitude maximum A2f_And A2f+The corresponding crest frequency f of difference2-And f2+, and f2+>f2-, A2f+>A2f-；
Step 3, by crest frequency f1-, crest frequency f1+, amplitude maximum A1f-With amplitude maximum A1f+It is updated in formula one
Barycenter resolving is carried out, reference distance value R is obtained1；
By crest frequency f2-, crest frequency f2+, amplitude maximum A2f-With amplitude maximum A2f+Being updated in formula two carries out matter
The heart is resolved, and obtains measurement distance value R2；
Wherein, c represents the light velocity, t0Time interval is represented, △ f represent that frequency modulation(PFM) is spaced；
Step 4, by reference distance value R1With measurement distance value R2In substituting into following formula three, so as to obtain the reality of measured target
Distance value Rreal；
Rreal=(R1+R2-cτL/ 2)/2 (formula three),
Wherein, τLRepresent the phase delay time of local oscillator light.
3. ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM according to claim 1, it is special
Levy and be, the light of described Tunable Fabry-Perot Filter (6) output is the signal of the stepped change of frequency.
4. ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM according to claim 1, it is special
Levy and be, the drive signal that described double parallel MZM (3) is received is sine voltage signal.
5. ultra wide band scalariform FM/CW laser radar range systems based on double parallel MZM according to claim 1, it is special
Levy and be, the drive signal that described Tunable Fabry-Perot Filter (6) is received is stepwise voltage signal.
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