CN106707260B - A kind of light frequency tracking lock system and method applied to laser coherence ranging - Google Patents
A kind of light frequency tracking lock system and method applied to laser coherence ranging Download PDFInfo
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- CN106707260B CN106707260B CN201611202248.1A CN201611202248A CN106707260B CN 106707260 B CN106707260 B CN 106707260B CN 201611202248 A CN201611202248 A CN 201611202248A CN 106707260 B CN106707260 B CN 106707260B
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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
- 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
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
-
- 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
Abstract
The invention discloses a kind of light frequency tracking lock system and methods applied to laser coherence ranging.The system includes: first laser device, second laser, transmitting-receiving camera lens, bundling device and frequency locking ring: first laser device, for generating transmitting light source in the first preset temperature；Second laser, for generating local oscillator reference light in the second preset temperature；Camera lens is received and dispatched, is emitted for light source will to be emitted to target, and receives the echo-signal of target reflection；Bundling device closes beam processing for carrying out echo-signal and local oscillator reference light；Frequency locking ring, when the frequency difference of local oscillator reference light and echo-signal meets preset condition, completes the tracking lock to echo-signal for carrying out frequency modulation(PFM) to local oscillator reference light according to closing beam treated signal.By means of technical solution of the present invention, the tracking lock to high-speed moving object light frequency can be realized, overcome influence of the Doppler frequency shift caused by high-speed moving object to relevant ranging to realize.
Description
Technical field
The present invention relates to field of mobile communication, in particular to a kind of light frequency tracking lock applied to laser coherence ranging
System and method.
Background technique
The high coherence of laser makes it possible coherent light as radar emission source, and laser coherence detection is compared traditional direct
Detecting has the detectivity for being higher by several magnitudes, and with good application prospect, therefore coherent detection technology is applied to
In laser radar.Ranging is a very important index of radar, and the principle of laser coherence range radar is to be divided into light source
Two-way, respectively as local oscillator light and transmitting light.Transmitting target illuminated carries the range information of target after returning, return light with
Local oscillator photomixing, it can be seen that range information, completes detection, the model schematic of traditional coherent range-measurement system is such as from mixing results
Shown in Fig. 1.
In actual tests, above scheme, which can satisfy, detects static or low-speed motion target, but if being detection high speed
Aircraft, echo-signal can be because airplane motion generate very big Doppler frequency shift, and frequency displacement is likely to be breached several hundred million or even several Jis
Hertz, such signal just exceeds the detective bandwidth of system, and system just loses range capability.
Summary of the invention
In order to effectively overcome moving target bring doppler interference, solve laser coherence ranging can only measure it is static or
The problem of low-speed motion target, the present invention provides a kind of applied to the light frequency tracking lock system of laser coherence ranging and side
Method.
The present invention provides a kind of light frequency tracking lock systems applied to laser coherence ranging, comprising: first laser
Device, second laser, transmitting-receiving camera lens, bundling device and frequency locking ring:
The first laser device, for generating transmitting light source in the first preset temperature；
The second laser, for generating local oscillator reference light in the second preset temperature；
The transmitting-receiving camera lens for emitting the transmitting light source to target, and receives the echo letter of the target reflection
Number；
The bundling device closes beam processing for carrying out the echo-signal and the local oscillator reference light；
The frequency locking ring works as institute for carrying out frequency modulation(PFM) to the local oscillator reference light according to closing beam treated signal
When stating the frequency difference of local oscillator reference light and the echo-signal and meeting preset condition, the tracking lock to the echo-signal is completed.
The present invention also provides a kind of light frequency tracking lock method applied to laser coherence ranging, including following step
It is rapid:
First laser device generates transmitting light source in the first preset temperature, is concurrently incident upon target；
Second laser generates local oscillator reference light in the second preset temperature；
Receive the echo-signal of the target reflection；
The echo-signal and the local oscillator reference light are carried out to close beam processing；
Frequency modulation(PFM) is carried out to the local oscillator reference light according to beam treated signal is closed, when the local oscillator reference light and institute
When stating the frequency difference of echo-signal and meeting preset condition, the tracking lock to the echo-signal is completed.
The present invention has the beneficial effect that:
Light frequency tracking lock system and method provided in an embodiment of the present invention applied to laser coherence ranging, for height
Fast moving target, which leads to the problem of large doppler frequency displacement, causes signal beyond system bandwidth, using two lasers respectively as
Then emission source and local vibration source carry out frequency sweep using local vibration source, complete to make echo meet system the search and track of echo-signal
Bandwidth can be realized the tracking lock to high-speed moving object light frequency, overcome the frequency of Doppler caused by high-speed moving object
The influence to relevant ranging is moved, and then realizes the coherent detection to high-speed moving object, it is high to solve laser coherence ranging measurement
The problem of fast moving target.
Detailed description of the invention
Fig. 1 is the model schematic of traditional coherent range-measurement system；
Fig. 2 is that the structure of the light frequency tracking lock system applied to laser coherence ranging of apparatus of the present invention embodiment is shown
It is intended to；
Fig. 3 is the structural schematic diagram of the frequency locking ring of apparatus of the present invention embodiment；
Fig. 4 is the process of the light frequency tracking lock method applied to laser coherence ranging of embodiment of the present invention method
Figure；
Fig. 5 is the schematic diagram that control algolithm is locked in embodiment of the present invention method.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
In order to effectively overcome moving target bring doppler interference, solve laser coherence ranging can only measure it is static or
The problem of low-speed motion target, the present invention provides a kind of light frequency tracking lock methods and dress applied to laser coherence ranging
It sets, below in conjunction with attached drawing and embodiment, the present invention will be described in further detail.It should be appreciated that tool described herein
Body embodiment is only used to explain the present invention, does not limit the present invention.
Apparatus according to the invention embodiment provides a kind of light frequency tracking lock dress applied to laser coherence ranging
It setting, Fig. 2 is the structural schematic diagram of the light frequency tracking lock system applied to laser coherence ranging of apparatus of the present invention embodiment,
As shown in Fig. 2, the light frequency tracking locking apparatus applied to laser coherence ranging of Installation practice includes: according to the present invention
One laser 20, second laser 22, transmitting-receiving camera lens 24, bundling device 26 and frequency locking ring 28, below to each of the embodiment of the present invention
A module is described in detail.
Apparatus of the present invention embodiment uses first laser device 20 and second laser 22, and two laser wavelengths can not be done
To absolutely unanimously, wavelength may differ by dozens of micromicron.For wavelength 1550nm laser, it is assumed that wavelength differs 1 micromicron (pm),
Optical frequency difference is up to hundred megahertzs.Also, laser wavelength is extremely sensitive to temperature and modulation curent change, temperature and modulation electricity
Greatly, frequency difference is easy for reaching several girz the variation of frequency drift caused by rheology, it is therefore desirable to set the work of first laser device
Make the operating temperature (i.e. the second preset temperature) of temperature (i.e. the first preset temperature) and second laser.
The first laser device 20, for generating transmitting light source in the first preset temperature；
The second laser 22, for generating local oscillator reference light in the second preset temperature；
The transmitting-receiving camera lens 24 for emitting the transmitting light source to target, and receives the echo of the target reflection
Signal；
The bundling device 26 closes beam processing for carrying out the echo-signal and the local oscillator reference light；
The frequency locking ring 28, for carrying out frequency modulation(PFM) to the local oscillator reference light according to closing beam treated signal, when
When the frequency difference of the local oscillator reference light and the echo-signal meets preset condition, completes the tracking to the echo-signal and lock
It is fixed.
If echo-signal frequency is f1, local oscillator light frequency is f2, they reach the light amplitude difference of optical detector cathode surface
Are as follows:
In formula, A1、A2Respectively amplitude of the two-beam at time pole surface；f1、f2The respectively optical frequency of two-beam；φ1、
φ2The respectively initial phase of two-beam.Net amplitude degree of the two-beam in time pole surface are as follows:
Switch to electric signal after mixing:
From in formula in latter, the optical frequency difference f of available two-beamd=f1-f2。fdFor caused by high-speed moving object
Doppler frequency shift, the i.e. foundation as closed loop frequency tracking lock.
The structural schematic diagram of the frequency locking ring 28 of Fig. 3 apparatus of the present invention embodiment, as shown in figure 3, the frequency locking ring includes: light
Electric explorer, frequency discriminator, FPGA and digital analog converter DAC；
The photodetector carries out photoelectricity mixing for that will close the optical signal after beam, obtains electric signal；
The frequency discriminator, for obtaining the frequency difference of the local oscillator reference light and the echo-signal according to the electric signal；
The FPGA, for judging whether the frequency difference meets preset condition, if the frequency difference meets preset condition,
Complete the tracking lock to the echo-signal；If the frequency difference is unsatisfactory for preset condition, tune is generated according to the frequency difference
Voltage processed, and the modulation voltage is output to the DAC；
The modulation electric current for generating modulation electric current according to the modulation voltage, and is output to described the by the DAC
Dual-laser device, to reduce the frequency difference of the local oscillator reference light that the second laser generates and the echo-signal.
Specifically, as shown in figure 3, the frequency locking ring 28 further includes temperature control module:
The FPGA is also used to obtain the temperature difference of first laser device and the temperature difference of second laser according to the frequency difference；
The temperature control module, for the temperature difference according to the first laser device to the operating temperature of the first laser device into
Row adjustment, so that the first laser device maintains first preset temperature；According to the temperature difference of the second laser to institute
The operating temperature for stating second laser is adjusted, so that the second laser maintains second preset temperature.
Specifically, the method for determination of first preset temperature and second preset temperature includes: according to first laser
The change curve of the wavelength with temperature of device and second laser, finds wavelength coincidence point, respectively obtains first preset temperature
With second preset temperature.
Preferably, as shown in figure 3, programming for convenience, the frequency locking ring 28 further includes the micro-control connecting with the FPGA
Single-chip microprocessor MCU.
The principal element for influencing laser frequency is temperature and modulation voltage, and the present invention needs accurately to control the two factors
System.Laser frequency by temperature change compared with modulation electric current it is much bigger, and heat absorb and release all relatively slowly, therefore need
First laser device is wanted to work in the first preset temperature, second laser works in the second preset temperature；By temperature control module, make
The operating temperature of one laser and second laser keeps stablizing.Modulation voltage is the mistake of electronics conversion to the change of laser frequency
Journey is swift in response, and completes fine tuning to optical frequency using high-precision analog-digital chip, completes closed-loop control according to count results.
In apparatus of the present invention embodiment, using two-stage temperature control.The thermal coefficient of copper is preferable, and two lasers are fixed on
In the closed box of copper, while a certain number of TEC refrigeration heat devices are fixed on shell, made by single-chip microcontroller collocation bridge circuit
It is operated close in the stable environment of room temperature, forms first order temperature control.Second level temperature control is the temperature control to laser seed source,
Using high-precision, efficient temperature control module, and temperature spot is tunable, is advantageously implemented the coarse adjustment to optical frequency.
Laser seed ource electric current is modulated using high-accuracy voltage, realizes the fine tuning to optical frequency, voltage modulated has selected ADI public
The DAC digital-to-analogue chip of model AD5790 is taken charge of, precision is 20.Feedback arrangement is optic fibre light path combination high speed signal counting processing
System.Optic fibre light path is an optical-fiber bundling device, is irradiated to photodetector after two beams are swashed combiner, the electricity after photoelectricity is mixed
Signal enters frequency discriminator, obtains current frequency difference, is sent into processor and calculates voltage adjustment amount, feeds back onto local oscillator laser, thus
Realize local oscillator laser to the tracking lock of echo-signal frequency.
Embodiment according to the method for the present invention provides a kind of light frequency tracking lock side applied to laser coherence ranging
Method, Fig. 4 are the flow charts of the light frequency tracking lock method applied to laser coherence ranging of embodiment of the present invention method, are such as schemed
Shown in 4, the light frequency tracking lock method according to an embodiment of the invention applied to laser coherence ranging, including locate as follows
Reason:
Step 401, first laser device generates transmitting light source in the first preset temperature, is concurrently incident upon target；
Step 402, second laser generates local oscillator reference light in the second preset temperature；
Step 403, the echo-signal of the target reflection is received；
Step 404, the echo-signal and the local oscillator reference light are carried out closing beam processing；
Step 405, frequency modulation(PFM) is carried out to the local oscillator reference light according to closing beam treated signal, when the local oscillator is joined
When examining the frequency difference of light and the echo-signal and meeting preset condition, the tracking lock to the echo-signal is completed.
Specifically, described carry out frequency modulation(PFM) to the local oscillator reference light according to closing beam treated signal, when described
When vibration reference light and the frequency difference of the echo-signal meet preset condition, complete include to the tracking lock of the echo-signal with
Lower step:
Step 1: the optical signal after conjunction beam being subjected to photoelectric conversion and photoelectricity is mixed, obtains electric signal；
Step 2: obtaining the frequency difference of the local oscillator reference light and the echo-signal according to the electric signal；
Step 3: judging whether the frequency difference meets preset condition, if the frequency difference meets preset condition, completion pair
The tracking lock of the echo-signal；If the frequency difference is unsatisfactory for preset condition, modulation voltage is generated according to the frequency difference,
Modulation electric current is generated according to the modulation voltage；
Step 4: the second laser generates new local oscillator reference light according to the modulation electric current, to believe with the echo
It number carries out closing beam processing；
Step 5: step 1~4 are repeated, until completing the tracking lock to the echo-signal.
Specifically, in step 3, modulation voltage can be generated according to locking control algolithm, Fig. 5 is embodiment of the present invention method
The schematic diagram of middle locking control algolithm.
Specifically, the light frequency tracking lock method applied to laser coherence ranging of embodiment of the present invention method further includes
Following steps:
The temperature difference of first laser device and the temperature difference of second laser are obtained according to the frequency difference；
The operating temperature of the first laser device is adjusted according to the temperature difference of the first laser device, so that described
One laser maintains first preset temperature；
The operating temperature of the second laser is adjusted according to the temperature difference of the second laser, so that described
Dual-laser device maintains second preset temperature.
Specifically, the light frequency tracking lock method applied to laser coherence ranging of embodiment of the present invention method further includes
Following steps: according to the change curve of first laser device and the wavelength with temperature of second laser, finding wavelength coincidence point, respectively
Obtain first preset temperature and second preset temperature
Illustrate embodiment of the method for the invention in order to more detailed, provides example 1.
(1) curve varied with temperature using two laser wavelengths of spectrometer measurement, finds wavelength coincidence point with determination
The operating temperature of two-laser.
(2) temperature control of laser two-stage is opened, makes its work in set temperature.
(3) when measuring high-speed moving object, enter mirror after light echo and local oscillator photomixing with large doppler frequency displacement
Frequency device calculates current frequency difference.
(4) FPGA according to frequency discrimination as a result, calculating the adjustment amount of high-speed digital-analog chip DAC, realize by change local oscillator light optical frequency
To the tracking lock of echo-signal, ranging is completed.
In order to which the Doppler frequency shift for overcoming high-speed moving object to generate is distinguished using scheme such as Fig. 2 using two lasers
As transmitting light source and local oscillator reference light source.Increase frequency locking ring, to local oscillator reference light source carry out frequency modulation(PFM), realize to echo into
Line frequency tracking, after local oscillator light is completed to echo-signal Frequency Locking, signal meets the detective bandwidth of system, to complete
To the range information extraction of high-speed moving object.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (4)
1. a kind of light frequency tracking lock system applied to laser coherence ranging, which is characterized in that including first laser device,
Dual-laser device, transmitting-receiving camera lens, bundling device and frequency locking ring:
The first laser device, for generating transmitting light source in the first preset temperature；
The second laser, for generating local oscillator reference light in the second preset temperature；
The transmitting-receiving camera lens for emitting the transmitting light source to target, and receives the echo-signal of the target reflection；
The bundling device closes beam processing for carrying out the echo-signal and the local oscillator reference light；
The frequency locking ring, for carrying out frequency modulation(PFM) to the local oscillator reference light according to closing beam treated signal, when described
When the frequency difference of vibration reference light and the echo-signal meets preset condition, the tracking lock to the echo-signal is completed；
The method of determination of first preset temperature and second preset temperature includes:
According to the change curve of first laser device and the wavelength with temperature of second laser, wavelength coincidence point is found, according to wavelength
Coincidence point respectively obtains first preset temperature and second preset temperature；
The frequency locking ring includes: photodetector, frequency discriminator, FPGA and digital analog converter DAC；
The photodetector carries out photoelectricity mixing for that will close the optical signal after beam, obtains electric signal；
The frequency discriminator, for obtaining the frequency difference of the local oscillator reference light and the echo-signal according to the electric signal；
The FPGA, if the frequency difference meets preset condition, is completed for judging whether the frequency difference meets preset condition
To the tracking lock of the echo-signal；If the frequency difference is unsatisfactory for preset condition, modulation electricity is generated according to the frequency difference
Pressure, and the modulation voltage is output to the DAC；
The modulation electric current for generating modulation electric current according to the modulation voltage, and is output to described second and swashed by the DAC
Light device, to reduce the frequency difference of the local oscillator reference light that the second laser generates and the echo-signal.
2. being applied to the light frequency tracking lock system of laser coherence ranging as described in claim 1, which is characterized in that described
Frequency locking ring further includes temperature control module:
The FPGA is also used to determine the temperature difference of the first laser device and the temperature of the second laser according to the frequency difference
Difference；
The temperature control module is adjusted for operating temperature of the temperature difference according to the first laser device to the first laser device
It is whole, so that the first laser device maintains first preset temperature；According to the temperature difference of the second laser to described
The operating temperature of dual-laser device is adjusted, so that the second laser maintains second preset temperature.
3. a kind of light frequency tracking lock method applied to laser coherence ranging, which comprises the following steps:
First laser device generates transmitting light source in the first preset temperature, is concurrently incident upon target；
Second laser generates local oscillator reference light in the second preset temperature；
Receive the echo-signal of the target reflection；
The echo-signal and the local oscillator reference light are carried out to close beam processing；
Frequency modulation(PFM) is carried out to the local oscillator reference light according to beam treated signal is closed, when the local oscillator reference light and described time
When the frequency difference of wave signal meets preset condition, the tracking lock to the echo-signal is completed；
It is described that frequency modulation(PFM) is carried out to the local oscillator reference light according to closing beam treated signal, when the local oscillator reference light and institute
When stating the frequency difference of echo-signal and meeting preset condition, complete to the tracking lock of the echo-signal the following steps are included:
Step 1: the optical signal after conjunction beam being subjected to photoelectric conversion and photoelectricity is mixed, obtains electric signal；
Step 2: obtaining the frequency difference of the local oscillator reference light and the echo-signal according to the electric signal；
Step 3: judging whether the frequency difference meets preset condition, if the frequency difference meets preset condition, complete to described
The tracking lock of echo-signal；If the frequency difference is unsatisfactory for preset condition, modulation voltage is generated according to the frequency difference, according to
The modulation voltage generates modulation electric current；
Step 4: the second laser generates new local oscillator reference light according to the modulation electric current, with the echo-signal into
Row closes beam processing；
Step 5: step 1~4 are repeated, until completing the tracking lock to the echo-signal；
It is further comprising the steps of:
According to the change curve of first laser device and the wavelength with temperature of second laser, wavelength coincidence point is found, is respectively obtained
First preset temperature and second preset temperature.
4. being applied to the light frequency tracking lock method of laser coherence ranging as claimed in claim 3, which is characterized in that also wrap
Include following steps:
The temperature difference of first laser device and the temperature difference of second laser are obtained according to the frequency difference；
The operating temperature of the first laser device is adjusted according to the temperature difference of the first laser device, so that described first swashs
Light device maintains first preset temperature；
The operating temperature of the second laser is adjusted according to the temperature difference of the second laser, so that described second swashs
Light device maintains second preset temperature.
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| CN107238843A (en) * | 2017-06-07 | 2017-10-10 | 深圳市东方宇之光科技股份有限公司 | laser imaging control method and device |
| CN107607943B (en) * | 2017-09-07 | 2020-06-23 | 西安电子科技大学 | Height measurement method of delay Doppler radar altimeter based on interference phase assistance |
| CN108923859B (en) * | 2018-07-16 | 2020-04-10 | 西安空间无线电技术研究所 | Coherent tracking device and method based on electro-optic deflection |
| CN109274432A (en) * | 2018-08-29 | 2019-01-25 | 西安电子科技大学 | Coherent tracking system and compensation method based on free space optical communication |
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