CN106226778A - A kind of coherent lidar system of high resolution measurement remote object - Google Patents
A kind of coherent lidar system of high resolution measurement remote object Download PDFInfo
- Publication number
- CN106226778A CN106226778A CN201610711883.6A CN201610711883A CN106226778A CN 106226778 A CN106226778 A CN 106226778A CN 201610711883 A CN201610711883 A CN 201610711883A CN 106226778 A CN106226778 A CN 106226778A
- Authority
- CN
- China
- Prior art keywords
- signal
- fiber
- optical
- output
- fiber optic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01S17/50—Systems of measurement based on relative movement of target
- G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses the coherent lidar system of a kind of high resolution measurement remote object, including: narrow linewidth seed light source, double flat line phase manipulator, radio-frequency signal source, fiber optic splitter, acousto-optic modulator, fiber amplifier, collimator, polarising beam splitter, quarter-wave plate, optical antenna, 2 × 2 optical-fiber bundling devices, balanced detector, signal processing module.The present invention distance and speed to remote object can carry out high resolution measurement simultaneously.The present invention has high detection sensitivity, High Range Resolution, at high speed resolution, laser all-fiber structure, the feature of output lead polarization high-peak power laser, has a wide range of applications in national defence and civilian field of detecting.
Description
Technical field
The invention belongs to laser radar technique field, particularly relate to the coherent laser of a kind of high resolution measurement remote object
Radar system.
Background technology
Laser detection and ranging technology (Light Detection and Ranging, lidar), is also called laser radar
Technology, through the development of many decades, has primarily formed following several range findings and speed-measuring method: (1) flight time directly measures；
(2) phase discriminator type Amplitude Modulation Continuous Wave range finding；(3) chirp amplitude continuous wave；(4) pulse Doppler coherent detection；(5) frequency modulation(PFM) is even
Continuous ripple coherent detection；(6) wavelength tuning continuous wave coherent detection；(7) wideband phase coded pulse coherent detection；(8) frequency is adjusted
Pulse coherence processed detects.Wherein, flight time direct measuring method is the most frequently used distance-finding method, very-long-range precision distance measurement system
System can reach mm class precision；Phase laser distance measurement is primarily adapted for use in short distance high accuracy range measurement, typical products range accuracy
General up to 5mm ± 1ppm；Chirp amplitude continuous wave technology is that one obtains by continuous laser amplitude is carried out frequency modulation(PFM)
Obtain the Detection Techniques of range information；Utilize optical heterodyne detection technology to obtain laser Doppler shift information thus ask for radial velocity
The laser radar of component is referred to as coherent Doppler lidar；Typical case's application of linear frequency modulation continuous wave coherent detection technology is
In Synthetic Aperture Laser Radar and retrosynthesis aperture laser field of radar；Wavelength tuning continuous wave coherent detection method feature is logical
Cross increase Frequency modulation range, improve range measurement accuracy, it is adaptable to closely high-acruracy survey application, resolution is up to μm amount
Level；Phase encoding pulse signal by the phase-modulation of signal is obtained the biggest equivalent bandwidth, thus improves thunder in time domain
The range resolution reached；Big energy, linear frequency modulation short pulse must be used in the system with remote high-precision measurement requirement to rush
Coherent laser light source.
In above-mentioned laser radar range and speed-measuring method, only the flight time directly measure, coherent pulse Doppler,
Chirp coherent detection these three method is suitable for the detection of distant object.Wherein flight time direct detection method
Improving ranging and depend on raising laser pulse peaks power, detectivity is lower than coherent detection, and cannot measure target speed
Degree.The range resolution ratio of coherent pulse Doppler measurement with time width be inversely proportional to, velocity resolution to time width be directly proportional (low signal-to-noise ratio
Time), remote probe cannot realize High Range Resolution and high speed resolution measurement simultaneously.Linear frequency modulation pulsion phase
Drying method uses big Timed automata chirp pulse signal, and big Bandwidth guaranteed range resolution ratio, coherent detection technology carries
High detectivity, uses in signal processing and solves line frequency modulation pulse compression technique and can effectively solve the problem that range resolution ratio and average
Launch the contradiction between power, therefore, it is possible to realize High Range Resolution and tachometric survey simultaneously.But the narrow arteries and veins of high-peak power
Width characteristic when punching does not has big so that linear frequency modulation pulse coherence method cannot realize resolution measurement at high speed.
Summary of the invention
In order to overcome problem above, it is an object of the invention to provide the relevant of a kind of high resolution measurement remote object and swash
Optical detection and ranging system, it is achieved distance and speed to remote object carry out high resolution measurement simultaneously.
First the output 1.5 micron wave length linear polarization continuous laser of narrow linewidth seed light source, enters the modulation of double flat line phase
Device obtains phase-modulation, obtains linear frequency modulation laser output.Double flat line phase manipulator Output of laser is through fiber optic splitter
Being divided into two-way, the local oscillator light that the lower-powered laser in road uses as radar, local oscillator light is divided into two bundles through fiber optic splitter again.
It is pulse signal that the laser that another road power is bigger enters acousto-optic modulator copped wave.After pulse laser enters fiber amplifier amplification
Output.Radio-frequency signal source produces linear frequency modulation signal and is loaded into double flat line phase manipulator, produces and linear frequency modulation simultaneously
The pulse chopping signal that signal synchronizes drives acousto-optic modulator.Pulse signal after acousto-optic copped wave is by fiber optic splitter sampling prison
Surveying, sampling pulse is concerned with a branch of local oscillator light, and coherent signal exports after closing bundle by 2 × 2 optical-fiber bundling devices by balance light electrical resistivity survey
Survey device detects.After fiber amplifier, the linearly polarized light beam of output is by incident from polarising beam splitter 1 port after collimating device collimation, warp
2 port outgoing, are then transformed to circularly polarized light via quarter-wave plate and launch through optical antenna.Radar uses receipts
Sending out unification optical antenna, the echo-signal therefore produced by target scattering returns along launching light path, echo-signal by four/
One wave plate is transformed to the line polarized light vertical with launching light beam polarization direction, from 3 port outputs of polarising beam splitter.Echo is believed
Balance photodetection is incided after closing bundle with another Shu Benzhen light by 2 × 2 optical-fiber bundling devices after number collimator injection fibre
Device uppermixing, obtains heterodyne signal.Monitoring signal and heterodyne signal are gathered by signal processing module and then process, and monitoring signal is made
For distance reference signal, for the light path transmitted in radar system with heterodyne signal combined measurement light beam, eliminate range measurement
Systematic error.The signal processing step of the present invention is: be calculated mesh initially with signal coherence detection method in range gate
Mark rough distance.Farthest with radar is measured apart from the required pulse turnaround time as the signal sampling time, to launch pulse
The physical distance resolution that width is corresponding is that range gate divides the signal gathered.After being linear frequency modulation due to Radar Local-oscillator laser
Continuous laser, target reflection echo only produces relevant beat frequency with local oscillator light in the range gate residing for target.By beat signal
Residing range gate position, available target range.After determining range gate residing for target, solution line frequency modulation method is then used to ask
Solve target accurate distance.What laser radar was launched is symmetric triangular chirp pulse signal.As long as recording upper and lower frequency sweep respectively
The respective beat frequency rate of section, can be achieved with the ranging and range rate to moving object.Additionally by upper and lower for symmetric triangular linear FM signal
The Beat Signal of frequency sweep carries out FFT process respectively, and the Doppler frequency utilizing moving target is right about target range frequency spectrum left and right
Claim the characteristic of skew, carry out spectral pair, distance speed Rhizoma Nelumbinis can be eliminated and close, be calculated target accurate distance.Finally use arteries and veins
Rush width when measuring method is increased signal thus improve tachometric survey resolution.
Further, described narrow linewidth seed light source is the narrow linewidth semiconductor laser of 1.5 micron waveband output continuous lasers
In device, DBR/DFB optical fiber laser, solid state laser any one, spectral line width is less than 5kHz, and polarization state is linear polarization, single
Mould polarization maintaining optical fibre exports, Output optical power 1～100mW.
Further, described double flat line phase manipulator 2 is the waveguide optical electrooptic modulator of 2 × 2MZI structure, and electric light is brilliant
Body material is Lithium metaniobate, potassium tantalate-niobate.
Further, described radio-frequency signal source is for producing what the linear frequency being applied on double flat line phase manipulator was modulated
Sine wave signal, signal(-) carrier frequency 10GHz, signal period 2 μ s, the signal in a cycle is by the upper frequency modulation of 1 μ s bandwidth 2GHz
Form with the lower FM signal of 1 μ s bandwidth 2GHz；Radio-frequency signal source is simultaneously used for producing the pulse being applied on acousto-optic modulator
Chopping signal, signal-pulse repetition frequency 1kHz, pulse duration 2 μ s.
Further, described fiber amplifier be single-mode optical fiber amplifier, double-cladding fiber amplifier or both combine composition
Multi-stage fiber amplifier.
Further, described fiber amplifier output laser pulse repetition rate 1kHz, pulse width 2 μ s, linear frequency modulation band
Wide 2GHz.
Further, the step of signal processing is: be calculated target initially with signal coherence detection method in range gate
Rough distance, then uses solution line frequency modulation method to process beat signal and is calculated target accurate distance, finally use pulse pair
Processing method is calculated target velocity.
The coherent lidar system of the high resolution measurement remote object that the present invention provides, has as follows compared to existing technology
Beneficial effect:
The present invention has the advantages that detectivity is high, and radar system launches linear frequency modulation narrow linewidth pulse laser, is visited
The echo-signal surveying target scattering carries out coherent detection with local oscillator light, it is possible to detection micromicrowatt magnitude small-signal, detectivity
High.
The present invention has the advantages that range resolution ratio is high, and the range resolution ratio of described radar system is by the tune launching laser
Bandwidth processed determines, and the modulation bandwidth launching laser is determined by the modulation bandwidth of double flat line phase manipulator, the highest permissible
Reach 18GHz bandwidth, it is possible to realize the high-resolution range measurement of remote object Centimeter Level.
Output of laser of the present invention has the feature of eye-safe；The optical component band tail optical fiber output that the present invention uses, swashs
Light device structure has the feature of all-fiber；The present invention has the feature of output lead polarization laser.The present invention has a kilowatt peak
The feature of value power output, it is possible to meet the remote probe demand to laser power.
Accompanying drawing explanation
Fig. 1 is the coherent lidar system structural representation of the high resolution measurement remote object that the embodiment of the present invention provides
Figure；
In Fig. 1: 1-narrow linewidth seed light source, 2-double flat line phase manipulator, 3-radio-frequency signal source, 4-the first fiber beam splitting
Device, 5-the second fiber optic splitter, 6-acousto-optic modulator, 7-the 3rd fiber optic splitter, 8-fiber amplifier, 9-first collimator,
10-polarising beam splitter, 11-quarter-wave plate, 12-optical antenna, 13-the second collimator, 14-the one 2 × 2nd optical-fiber bundling
Device, 15-the first balanced detector, 16-the 22 × 2nd optical-fiber bundling device, 17-the second balanced detector, 18-signal processing module.
Fig. 2 is linear FM signal and the pulse chopping signal relation of the radio-frequency signal source transmitting that the embodiment of the present invention provides
Figure.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, to the present invention
It is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
Determine the present invention.
Below in conjunction with the accompanying drawings the application principle of the present invention is explained in detail.
Refering to Fig. 1, the coherent lidar system composition of high resolution measurement remote object includes: narrow linewidth seed light source
1, double flat line phase manipulator 2, radio-frequency signal source 3, the first fiber optic splitter 4, the second fiber optic splitter 5, acousto-optic modulator 6,
3rd fiber optic splitter 7, fiber amplifier 8, first collimator 9, polarising beam splitter 10, quarter-wave plate 11, optics sky
Line 12, the second collimator the 13, the one 2 × 2nd optical-fiber bundling device 4, the first balanced detector the 15, the 22 × 2nd optical-fiber bundling device 16,
Second balanced detector 17, signal processing module 18.Wherein:
Narrow linewidth seed light source 1 exports 1.5 micron wave length linear polarization continuous lasers.Radio-frequency signal source 3 produces linear frequency
Modulated signal, is loaded into double flat line phase manipulator 2.Narrow linewidth seed light source 1 outfan and double flat line phase manipulator 2 phase
Even, laser occurs linear frequency to modulate in double flat line phase manipulator 2.Double flat line phase manipulator 2 outfan and the first light
Fine beam splitter 4 is connected, and the first fiber optic splitter 4 one tunnel output is connected with acousto-optic modulator 6, and radio-frequency signal source 3 produces with linear
The pulse chopping signal that FM signal synchronizes, is loaded into acousto-optic modulator 6, and continuous laser is chopped into pulse laser output.Sound
Photomodulator 6 exports and is connected with the second fiber optic splitter 5, and the second fiber optic splitter 5 one tunnel output is connected with fiber amplifier 8,
Laser after amplification exports from fiber amplifier 8 and is collimated by first collimator 9, and first collimator 9 exports from polarising beam splitter
10 transmissions, become circularly polarized light through quarter-wave plate 11, and circularly polarized light is finally transmitted into target from optical antenna 12.The
One another road of fiber optic splitter 4 output is connected with the second fiber optic splitter 5, after the second fiber optic splitter 5 exports two-way modulation
Laser is as Radar Local-oscillator light.Second fiber optic splitter 5 one tunnel output is connected with the one 2 × 2nd optical-fiber bundling device 14, the 3rd optical fiber
The output of beam splitter 7 one tunnel is connected with the one 2 × 2nd optical-fiber bundling device 14, the light pulse of the 3rd fiber optic splitter 7 output and the second light
The continuous local oscillator light of fine beam splitter 5 output is relevant in the one 2 × 2nd optical-fiber bundling device 14, and coherent light signal is from the one 2 × 2nd light
Incide the first balanced detector 15 after fine bundling device 14 output and be converted to the signal of telecommunication, send into signal processing module 18 as distance
Reference signal.Echo optical signal after being reflected or scattering is received by optical antenna 12, becomes through quarter-wave plate 11
Becoming the line polarized light orthogonal with emergent light polarization direction, line polarized light is reflected into the second collimator by polarising beam splitter 10
13, then it is coupled in one end input optical fibre of the 22 × 2nd optical-fiber bundling device 16.Second fiber optic splitter 5 one tunnel output with
22 × 2nd optical-fiber bundling device 16 is connected, and continuous local oscillator light and echo light pulse are relevant in the 22 × 2nd optical-fiber bundling device 16,
Coherent light signal incides the second balanced detector 17 after the 22 × 2nd optical-fiber bundling device 16 output and is converted to the signal of telecommunication, sends into
Signal processing module 18 is jointly processed by with distance reference signal, calculates distance and the velocity information of target.
The key components in embodiment used be presented herein below:
Narrow linewidth seed light source 1 can be 1.5 micron waveband the output narrow linewidth semiconductor laser of continuous laser, DBR/
In DFB optical fiber laser, solid state laser any one, spectral line width be less than 5kHz, polarization state is linear polarization, single mode protect polarisation
Fine output, Output optical power 1～100mW.
Double flat line phase manipulator 2 is the waveguide optical electrooptic modulator of 2 × 2MZI structure, and Electrooptic crystal material can be
Lithium metaniobate, potassium tantalate-niobate etc..It is capable of exporting light with the radio frequency signals drive double flat line phase manipulator of linear frequency modulation
Shift frequency amount radio frequency signal intensity, it is achieved the linear frequency modulation of light frequency.
Radio-frequency signal source 3 is for producing the sinusoidal wave letter of the linear frequency modulation being applied on double flat line phase manipulator 2
Number, signal(-) carrier frequency 10GHz, signal period 2 μ s, the signal in a cycle is by the upper frequency modulation of 1 μ s bandwidth 2GHz and 1 μ s bandwidth
The lower FM signal composition of 2GHz.Radio-frequency signal source 3 is simultaneously used for producing the pulse chopping letter being applied on acousto-optic modulator 6
Number, signal-pulse repetition frequency 1kHz, pulse duration 2 μ s.
Fiber amplifier 8 can be single-mode optical fiber amplifier, double-cladding fiber amplifier or both combine the multistage of composition
Fiber amplifier.
Polarising beam splitter 10 is made up of polarization splitting prism.
Repetition rate 1kHz of radar emission narrow-linewidth laser pulse, pulse width 2 μ s, linear frequency modulation bandwidth 2GHz.
The signal relation that the radio-frequency signal source of the present invention is launched is:
In the present invention, described radio-frequency signal source 3 produces linear frequency modulated sinusoid signal and pulse chopping respectively
Signal, two signals have the requirement of synchronicity, and mutual relation refers to Fig. 2.The band of linear frequency modulated sinusoid signal is a width of
F, the cycle is T, and front T/2 is chirp signal in frequency, and rear T/2 is frequency down-chirp signal, and signal is the most continuously every output.Pulse
The pulse duration t of chopping signal is equal to the cycle T of linear frequency modulated sinusoid signal, t with T initial time is identical, arteries and veins
The pulse rushing chopping signal just includes a cycle of linear frequency modulated sinusoid signal or multiple cycle.Linear frequency
The repetition rate of rate modulated sinusoid signal is more than the repetition rate of pulse chopping signal.
The signal processing step of the present invention is:
It is calculated the rough distance of target initially with signal coherence detection method in range gate.Farthest measurement with radar
The distance required pulse turnaround time is the signal sampling time, with physical distance resolution corresponding to fire pulse width for away from
The signal gathered is divided from door.Owing to Radar Local-oscillator laser is the continuous laser after linear frequency modulation, target reflection echo only exists
Produce relevant beat frequency with local oscillator light in range gate residing for target.By the range gate position residing for beat signal, available target
Distance.
After determining range gate residing for target, solution line frequency modulation method is then used to solve target accurate distance.Laser radar
Launch is symmetric triangular chirp pulse signal.As long as recording the upper and lower respective beat frequency rate of frequency sweep section respectively, just can be real
The now ranging and range rate to moving object.Additionally the Beat Signal of upper and lower for symmetric triangular linear FM signal frequency sweep is carried out respectively
FFT process, utilizes the Doppler frequency characteristic about the symmetrical skew of target range frequency spectrum of moving target, carries out frequency spectrum and join
Right, distance speed Rhizoma Nelumbinis can be eliminated and close, be calculated target accurate distance.
Pulse is finally used to width during measuring method increase signal thus to improve tachometric survey resolution.Waveform is by pulse
A kind of high Timed automata waveform, it is possible to simultaneously realize distance and speed high-acruracy survey.In Pulse Doppler Weather Radar
As long as it has been proved that the Doppler frequency standard deviation of target is more much smaller than signal sampling rate, pulse method being calculated
Doppler's average speed and variance are just very close to actual value.
Above technical scheme can realize a kind of high resolution measurement remote object distance and the coherent laser radar of speed
System, has a wide range of applications in national defence and civilian field of detecting.
According to above-described embodiment, the present invention just can be realized well.What deserves to be explained is, before above-mentioned design principle
Put, for solving same technical problem, even if some made on architecture basics disclosed in this invention are without substantial
Changing or polishing, the essence of the technical scheme used is still as the present invention, therefore it should also be as the protection model in the present invention
In enclosing.
Claims (5)
1. a coherent lidar system for high resolution measurement remote object, is characterised by, its this high resolution measurement is remote
Journey mesh target coherent lidar system includes: narrow linewidth seed light source (1), double flat line phase manipulator (2), radio-frequency signal source
(3), the first fiber optic splitter (4), the second fiber optic splitter (5), acousto-optic modulator (6), the 3rd fiber optic splitter (7), optical fiber
Amplifier (8), first collimator (9), polarising beam splitter (10), quarter-wave plate (11), optical antenna (12), second is accurate
Straight device (13), 1 the one 2 × 2nd optical-fiber bundling device (14), the first balanced detector (15), the 22 × 2nd optical-fiber bundling device (16), the
Two balanced detector (17), signal processing module (18)；
Above-mentioned each element annexation is as follows:
Radio-frequency signal source (3) is connected with double flat line phase manipulator (2) and acousto-optic modulator (6) is connected；Narrow linewidth seed light source
(1) outfan is connected with double flat line phase manipulator (2), double flat line phase manipulator (2) outfan and the first fiber optic splitter
(4) being connected, the first fiber optic splitter (4) tunnel output is connected with acousto-optic modulator (6), and acousto-optic modulator (6) output is with second
Fiber optic splitter (5) is connected, and the second fiber optic splitter (5) tunnel output is connected with fiber amplifier (8), fiber amplifier (8)
Exporting and collimated by first collimator (9), first collimator (9) exports from polarising beam splitter (10) transmission, through 1/4th
Wave plate (11) is launched from optical antenna (12)；The output of first fiber optic splitter (4) another road and the second fiber optic splitter (5) phase
Even, the second fiber optic splitter (5) tunnel output is connected with the one 2 × 2nd optical-fiber bundling device (14), the 3rd fiber optic splitter (7)
Road output is connected with the one 2 × 2nd optical-fiber bundling device (14), the 3rd fiber optic splitter (7) output and the second fiber optic splitter (5)
Road output is connected in the one 2 × 2nd optical-fiber bundling device (14), the one 2 × 2nd optical-fiber bundling device (14) and the first balanced detector
(15) being connected, the first balanced detector (15) is connected with signal processing module (18)；Optical antenna (12) is received back to the glistening light of waves and passes through
It is reflected into the second collimator (13) by polarising beam splitter (10), the second collimator (13) and the after quarter-wave plate (11)
One end input optical fibre of 22 × 2 optical-fiber bundling devices (16) is connected；Second fiber optic splitter (5) road output optical fibre and the 2nd 2 ×
2 optical-fiber bundling devices (16) are connected, and the 22 × 2nd optical-fiber bundling device (16) is connected with the second balanced detector (17), and the second balance is visited
Survey device (17) to be connected with signal processing module (18).
The coherent lidar system of a kind of high resolution measurement remote object the most according to claim 1, its feature exists
In, narrow linewidth seed light source (1), double flat line phase manipulator (2), radio-frequency signal source (3), acousto-optic modulator (6), fiber amplifier
Device (8) constitutes the laser module of radar system, produces the output of wide-band Chirp pulse laser；Narrow linewidth seed light source (1)
Export 1.5 micron wave length linear polarization continuous lasers；Radio-frequency signal source (3) produces linear frequency modulation signal, is loaded into double flat row
Phase-modulator (2)；Radio-frequency signal source (3) produces the pulse chopping signal Tong Bu with linear FM signal, is loaded into acousto-optic and adjusts
Device processed (6)；Narrow linewidth seed light source (1) outfan is connected with double flat line phase manipulator (2), and laser is modulated at double flat line phase
Device (2) occurs linear frequency modulation；Double flat line phase manipulator (2) output continuous laser is connected by acousto-optic modulator (6) and cuts
Ripple is pulse laser output, and acousto-optic modulator (6) output pulse laser is amplified output by fiber amplifier (8).
The coherent lidar system of a kind of high resolution measurement remote object the most according to claim 1, its feature exists
In, radar system uses transmitting-receiving unification optical antenna；The linearly polarized light beam that fiber amplifier (8) exports is by the first collimation
From the incidence of polarising beam splitter (10) Single port after device (9) collimation, through Two-port netwerk outgoing, then become by quarter-wave plate (11)
It is changed to circularly polarized light launch through optical antenna (12)；Therefore the echo-signal produced by target scattering is returned along launching light path
Returning, echo-signal is transformed to the line polarized light vertical with launching light beam polarization direction, from polarization by quarter-wave plate (11)
Three port outputs of beam splitter (10) enter the second collimator (13).
The coherent lidar system of a kind of high resolution measurement remote object the most according to claim 1, its feature exists
In, the continuous local oscillator light that the light pulse of the 3rd fiber optic splitter 7 output and the second fiber optic splitter 5 export is at the one 2 × 2nd optical fiber
Being concerned with in bundling device 14, coherent light signal incides the first balanced detector 15 turns after the one 2 × 2nd optical-fiber bundling device 14 output
It is changed to the signal of telecommunication, sends into signal processing module 18 as distance reference signal；Distance reference signal is for combining with heterodyne signal
The light path that measuring beam transmits in radar system, eliminates the systematic error of range measurement.
The coherent lidar system of a kind of high resolution measurement remote object the most according to claim 1, its feature exists
In, signal processing step is: be calculated the rough distance of target initially with signal coherence detection method in range gate；With radar
Farthest to measure the distance required pulse turnaround time be the signal sampling time, with the physical distance that fire pulse width is corresponding
Resolution is the signal that range gate divides the second balanced detector (17) input signal processing module (18)；Residing for beat signal
Range gate position, available target range；After determining range gate residing for target, solution line frequency modulation method is then used to solve mesh
Mark accurate distance；When finally using pulse that measuring method is increased signal, width obtains resolution at high speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610711883.6A CN106226778A (en) | 2016-08-23 | 2016-08-23 | A kind of coherent lidar system of high resolution measurement remote object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610711883.6A CN106226778A (en) | 2016-08-23 | 2016-08-23 | A kind of coherent lidar system of high resolution measurement remote object |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106226778A true CN106226778A (en) | 2016-12-14 |
Family
ID=57554141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610711883.6A Pending CN106226778A (en) | 2016-08-23 | 2016-08-23 | A kind of coherent lidar system of high resolution measurement remote object |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106226778A (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594256A (en) * | 2018-04-16 | 2018-09-28 | 合肥菲涅尔光电科技有限公司 | A kind of coherent laser radar based on pulse coding technique |
| CN108761426A (en) * | 2018-09-04 | 2018-11-06 | 南京牧镭激光科技有限公司 | A kind of coherent pulse laser radar |
| CN108761487A (en) * | 2018-07-13 | 2018-11-06 | 中国电子科技集团公司第二十六研究所 | A kind of big bandwidth laser windfinding radar system |
| CN109375229A (en) * | 2018-09-19 | 2019-02-22 | 北京遥感设备研究所 | A kind of laser radar for remote high-speed target measurement |
| CN109581411A (en) * | 2019-01-15 | 2019-04-05 | 中国科学院上海光学精密机械研究所 | Synthetic aperture laser imaging radar receive-transmit system based on light beam optics coherence tomography |
| CN110261644A (en) * | 2018-07-27 | 2019-09-20 | 成都信息工程大学 | A kind of airborne measuring wind speed laser radar system |
| CN110346778A (en) * | 2018-04-03 | 2019-10-18 | 通用汽车环球科技运作有限责任公司 | Coherent lidar system with extended field of view |
| CN110596718A (en) * | 2019-09-20 | 2019-12-20 | 梧州学院 | Phase distance measuring device and method based on laser heterodyne detection |
| CN110806586A (en) * | 2020-01-08 | 2020-02-18 | 杭州爱莱达科技有限公司 | Non-scanning linear frequency modulation continuous wave speed and distance measuring laser three-dimensional imaging method and device |
| CN110954909A (en) * | 2018-09-27 | 2020-04-03 | 苏州溯光科技信息有限公司 | Linear frequency sweep coherent laser radar system |
| CN112305550A (en) * | 2019-08-01 | 2021-02-02 | 宁波飞芯电子科技有限公司 | Coherent detection device and method |
| CN112433221A (en) * | 2020-12-15 | 2021-03-02 | 深圳市中图仪器股份有限公司 | Absolute distance measuring device based on polarization modulation |
| CN112432664A (en) * | 2020-11-11 | 2021-03-02 | 山东大学 | All-fiber laser detection system for tunnel safety monitoring and working method |
| CN112630746A (en) * | 2020-12-01 | 2021-04-09 | 北京遥感设备研究所 | Pulse Doppler laser radar for long-distance target measurement |
| CN113661411A (en) * | 2019-03-29 | 2021-11-16 | 我们科技有限责任公司 | Switchable coherent pixel array for frequency modulated continuous wave optical detection and ranging |
| CN113661410A (en) * | 2018-12-20 | 2021-11-16 | 通用汽车巡航控股有限公司 | Lidar system configured to compute intervals at different interval resolutions |
| CN114019534A (en) * | 2021-11-22 | 2022-02-08 | 上海科乃特激光科技有限公司 | Wind measuring radar |
| CN115508858A (en) * | 2022-11-10 | 2022-12-23 | 武汉光谷航天三江激光产业技术研究院有限公司 | Multi-beam linear frequency modulation pulse coherent laser three-dimensional imaging system and method |
| WO2024139685A1 (en) * | 2022-12-28 | 2024-07-04 | 武汉万集光电技术有限公司 | Opa laser radar, object detection method and apparatus, medium and product |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004255A (en) * | 2010-09-17 | 2011-04-06 | 中国科学院上海技术物理研究所 | Chirp amplitude laser infrared radar distance-Doppler zero-difference detection system |
| CN102495411A (en) * | 2011-10-18 | 2012-06-13 | 中国科学院上海技术物理研究所 | Submillimeter-level linear tuning laser ranging system and signal processing method |
| CN104914444A (en) * | 2015-07-06 | 2015-09-16 | 江苏安智光电科技有限公司 | Long-distance laser heterodyne interference range-finding structure |
| CN105470798A (en) * | 2016-01-29 | 2016-04-06 | 成都信息工程大学 | Linear frequency modulation single frequency pulse optical fiber laser device |
| CN206114903U (en) * | 2016-08-23 | 2017-04-19 | 成都信息工程大学 | High resolution measures coherent laser radar system of long -range target |
-
2016
- 2016-08-23 CN CN201610711883.6A patent/CN106226778A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004255A (en) * | 2010-09-17 | 2011-04-06 | 中国科学院上海技术物理研究所 | Chirp amplitude laser infrared radar distance-Doppler zero-difference detection system |
| CN102495411A (en) * | 2011-10-18 | 2012-06-13 | 中国科学院上海技术物理研究所 | Submillimeter-level linear tuning laser ranging system and signal processing method |
| CN104914444A (en) * | 2015-07-06 | 2015-09-16 | 江苏安智光电科技有限公司 | Long-distance laser heterodyne interference range-finding structure |
| CN105470798A (en) * | 2016-01-29 | 2016-04-06 | 成都信息工程大学 | Linear frequency modulation single frequency pulse optical fiber laser device |
| CN206114903U (en) * | 2016-08-23 | 2017-04-19 | 成都信息工程大学 | High resolution measures coherent laser radar system of long -range target |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346778B (en) * | 2018-04-03 | 2023-11-21 | 通用汽车环球科技运作有限责任公司 | Coherent lidar system with extended field of view |
| CN110346778A (en) * | 2018-04-03 | 2019-10-18 | 通用汽车环球科技运作有限责任公司 | Coherent lidar system with extended field of view |
| CN108594256A (en) * | 2018-04-16 | 2018-09-28 | 合肥菲涅尔光电科技有限公司 | A kind of coherent laser radar based on pulse coding technique |
| CN108594256B (en) * | 2018-04-16 | 2021-10-12 | 夏和娣 | Coherent laser radar based on pulse coding technology |
| CN108761487A (en) * | 2018-07-13 | 2018-11-06 | 中国电子科技集团公司第二十六研究所 | A kind of big bandwidth laser windfinding radar system |
| CN108761487B (en) * | 2018-07-13 | 2024-02-23 | 中国电子科技集团公司第二十六研究所 | Large-bandwidth laser wind-finding radar system |
| CN110261644A (en) * | 2018-07-27 | 2019-09-20 | 成都信息工程大学 | A kind of airborne measuring wind speed laser radar system |
| CN110261644B (en) * | 2018-07-27 | 2024-05-28 | 成都信息工程大学 | Airborne wind speed measurement laser radar system |
| CN108761426A (en) * | 2018-09-04 | 2018-11-06 | 南京牧镭激光科技有限公司 | A kind of coherent pulse laser radar |
| CN109375229A (en) * | 2018-09-19 | 2019-02-22 | 北京遥感设备研究所 | A kind of laser radar for remote high-speed target measurement |
| CN110954909A (en) * | 2018-09-27 | 2020-04-03 | 苏州溯光科技信息有限公司 | Linear frequency sweep coherent laser radar system |
| CN113661410A (en) * | 2018-12-20 | 2021-11-16 | 通用汽车巡航控股有限公司 | Lidar system configured to compute intervals at different interval resolutions |
| CN109581411A (en) * | 2019-01-15 | 2019-04-05 | 中国科学院上海光学精密机械研究所 | Synthetic aperture laser imaging radar receive-transmit system based on light beam optics coherence tomography |
| CN113661411A (en) * | 2019-03-29 | 2021-11-16 | 我们科技有限责任公司 | Switchable coherent pixel array for frequency modulated continuous wave optical detection and ranging |
| CN112305550A (en) * | 2019-08-01 | 2021-02-02 | 宁波飞芯电子科技有限公司 | Coherent detection device and method |
| CN110596718A (en) * | 2019-09-20 | 2019-12-20 | 梧州学院 | Phase distance measuring device and method based on laser heterodyne detection |
| CN110596718B (en) * | 2019-09-20 | 2023-03-10 | 梧州学院 | Phase distance measuring device and method based on laser heterodyne detection |
| CN110806586A (en) * | 2020-01-08 | 2020-02-18 | 杭州爱莱达科技有限公司 | Non-scanning linear frequency modulation continuous wave speed and distance measuring laser three-dimensional imaging method and device |
| CN112432664A (en) * | 2020-11-11 | 2021-03-02 | 山东大学 | All-fiber laser detection system for tunnel safety monitoring and working method |
| CN112432664B (en) * | 2020-11-11 | 2022-04-08 | 山东大学 | All-fiber laser detection system for tunnel safety monitoring and working method |
| CN112630746B (en) * | 2020-12-01 | 2023-09-15 | 北京遥感设备研究所 | Pulse Doppler laser radar for measuring long-distance target |
| CN112630746A (en) * | 2020-12-01 | 2021-04-09 | 北京遥感设备研究所 | Pulse Doppler laser radar for long-distance target measurement |
| CN112433221B (en) * | 2020-12-15 | 2023-06-27 | 深圳市中图仪器股份有限公司 | Absolute distance measuring device based on polarization modulation |
| CN112433221A (en) * | 2020-12-15 | 2021-03-02 | 深圳市中图仪器股份有限公司 | Absolute distance measuring device based on polarization modulation |
| CN114019534A (en) * | 2021-11-22 | 2022-02-08 | 上海科乃特激光科技有限公司 | Wind measuring radar |
| CN115508858A (en) * | 2022-11-10 | 2022-12-23 | 武汉光谷航天三江激光产业技术研究院有限公司 | Multi-beam linear frequency modulation pulse coherent laser three-dimensional imaging system and method |
| WO2024139685A1 (en) * | 2022-12-28 | 2024-07-04 | 武汉万集光电技术有限公司 | Opa laser radar, object detection method and apparatus, medium and product |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106226778A (en) | A kind of coherent lidar system of high resolution measurement remote object | |
| CN206114903U (en) | High resolution measures coherent laser radar system of long -range target | |
| CN100478703C (en) | Chaos laser range-measurement method and device based on semiconductor laser | |
| CN106886031B (en) | Rayleigh Doppler anemometry laser radar based on wide range gating coherent detection | |
| CN105785395B (en) | A kind of coherent Doppler LDV technique of multi-wavelength beam synthesis | |
| CN103777207B (en) | A kind of three wavelength real-time calibration laser radars | |
| CN105629258A (en) | Speed measurement and distance measurement system and speed measurement and distance measurement method based on pseudo-random code phase modulation and heterodyne detection | |
| US20110292371A1 (en) | Method and Apparatus for a Pulsed Coherent Laser Range Finder | |
| CN106154289B (en) | Direct anemometry laser radar based on difference excited Brillouin enhancement effect | |
| CN101893475B (en) | A kind of distributed optical fiber vibration sensing system based on fiber delay line | |
| CN113383246B (en) | FMCW laser radar system | |
| CN111007526B (en) | System and method for suppressing optical noise of continuous wave all-fiber coherent Doppler laser speed measurement radar | |
| CN102495411A (en) | Submillimeter-level linear tuning laser ranging system and signal processing method | |
| CN104914444A (en) | Long-distance laser heterodyne interference range-finding structure | |
| US20210382164A1 (en) | Multi-tone continuous wave detection and ranging | |
| CN103116164A (en) | Heterodyne pulse compression type multifunctional laser radar and controlling method thereof | |
| CN112526538A (en) | Frequency modulation continuous wave laser radar capturing system and method based on FDML | |
| CN111912516A (en) | Phase-synchronized optical fiber distributed vibration measurement device, driver and method | |
| CN109884655A (en) | Light based on light Semiconductor Lasers carries FM-CW laser ranging system | |
| JPWO2019186914A1 (en) | Laser radar device | |
| CN109239731B (en) | Device and method for realizing detection and amplification of spatial weak signal based on spontaneous Brillouin scattering | |
| De et al. | Photonics radar modeling and simulation in opti-system platform for high resolution target detection | |
| CN110456383A (en) | A kind of molecular scattering coherent lidar system | |
| CN109669189A (en) | Wide range, the high-precision absolute distance meter device being switched fast based on OEO | |
| CN211905692U (en) | Triangular wave type frequency modulation continuous wave laser radar speed measurement system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161214 |