CN105929407A - Laser wind-finding radar optical antenna focal length self-adaptive adjustment method - Google Patents
Laser wind-finding radar optical antenna focal length self-adaptive adjustment method Download PDFInfo
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- CN105929407A CN105929407A CN201610259832.4A CN201610259832A CN105929407A CN 105929407 A CN105929407 A CN 105929407A CN 201610259832 A CN201610259832 A CN 201610259832A CN 105929407 A CN105929407 A CN 105929407A
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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
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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Abstract
The invention discloses a laser wind-finding radar optical antenna focal length self-adaptive adjustment method. With application of the method, the radar detection range is enabled to have certain self-adaptability for the change of atmospheric visibility. The method is realized through the following technical scheme that radar control software and an echo distance door set value are set in a central control computer (1), and the radar control software compares the statistical number of echo signal-to-noise ratio standard distance doors with the set value so as to judge whether the statistical number of signal-to-noise ratio standard distance doors exceeds the set value; when the central control computer analyzes that the number of wind field measurement signal-to-noise ratio standard distance doors is lower than the set value, wind-finding radar optical antenna focal length is automatically adjusted, a focusing motor is controlled to slowly move an antenna secondary lens along the axis of an optical focusing antenna and the equivalent focal length of the optical focusing antenna is changed; meanwhile, the central control computer determines the focusing direction according to the currently measured change trend of the number of signal-to-noise ratio standard distance doors through focusing, updates the initial position of the focusing motor and searches the optimal focal length.
Description
Technical field
The present invention relates to the adaptive regulation method of a kind of windfinding radar optical antenna focal length, particularly pulsed optical fibre laser survey
Wind and thunder reaches the adaptive regulation method of optical antenna focal length.
Background technology
Pulsed optical fibre laser windfinding radar utilizes in air the small aerosol particle with wind drift many to laser light scattering echo
General Le frequency shift effect carries out the measurement of atmospheric wind, and the aerosol condition of atmospheric environment is to a certain extent to LDV technique
Detectivity (detection range, signal to noise ratio etc.) produces harmful effect.From domestic and international research and development present situation, pulse laser is surveyed
Wind and thunder reaches the optical antenna using fixed focal length more and laser carries out launching reception, but finds during long-term experiment is observed, and swashs
The detection performance of light windfinding radar is not only easily affected by atmospheric condition, also has substantial connection with radar optics antenna focusing position.
LDV technique based on fixed focal length optical antenna is under the conditions of polytropic atmosphere, and detection performance has significant difference, as at height
Original area and plains region, the former detectivity significantly reduces compared with the latter, therefore laser based on fixed focal length optical antenna
Windfinding radar has certain limitation on using.
Summary of the invention
The present invention is further improvement of existing technologies and development, its objective is the weak point for conventional art, carries
For a kind of pulsed optical fibre laser windfinding radar optical antenna focal length Automatic adjusument, thus improve Laser Measuring wind and thunder to a certain extent
The method reaching detection performance.
The technical solution of the present invention is as follows: the adaptive regulation method of a kind of windfinding radar optical antenna focal length, its feature
Be to comprise the steps: in windfinding radar, employing controlled computer 1 and is received back to ripple range gate signal-to-noise ratio data, and in
Built-in radar manipulation software and echo range gate setting value in control computer 1, the echo signal to noise ratio that radar manipulation software will count
Range gate number up to standard compares with setting value, it is judged that whether the signal to noise ratio range gate up to standard number counted exceedes setting value 8；
When central control computer analyzes Wind field measurement signal to noise ratio range gate up to standard number less than setting value, automatically it is adjusted windfinding radar light
Learning antenna focal length, control focusing motor, along optical focusing antenna axis slow portable antenna secondary mirror, changes optical focusing antenna
Equivalent focal length；Computer is controlled according to focusing when the variation tendency of the signal to noise ratio range gate up to standard number of pre-test determines focusing side in Tong Shi
To, make radar signal to noise ratio range gate up to standard number be maintained at more than setting value, or when reaching maximum under the conditions of Real-Time Atmospheric, order
Focusing motor quits work, and updates focusing motor initial position, continues monitoring windfinding radar signal to noise ratio range gate up to standard number and sets
The relation of definite value, enters in the circulation of search pinpointed focus.
The present invention has the advantages that compared to prior art
The present invention is directed to the LDV technique of the fixed focal length optical antenna limitation on using, swash at windfinding radar, pulse fiber
In light windfinding radar, employing is controlled computer 1 and is received back to ripple range gate signal-to-noise ratio data, and built-in thunder in middle control computer 1
Reach manipulation software and echo range gate setting value, radar manipulation software by the echo signal to noise ratio range gate up to standard number counted with set
Definite value compares, it is judged that whether the signal to noise ratio range gate up to standard number counted exceedes setting value；Use the side of Zoom optical antenna
Formula, when radar range reduces, by regulation optical antenna focal length, makes optical antenna focal position arrive an optimum bit
Put, real-time adaptive atmospheric condition, LDV technique detection performance can be improved to a certain extent so that it is by atmospheric condition
It is minimum that impact reduces.Solve prior art LDV technique based on fixed focal length optical antenna under the conditions of polytropic atmosphere,
Detection performance has the problem of significant difference, overcomes highlands and plains region, and the former detectivity is notable compared with the latter
The defect reduced.
The present invention, when pulsed optical fibre laser windfinding radar signal to noise ratio range gate up to standard number is less than setting value, passes through radar optics
Being automatically adjusted of antenna focal length, makes radar range that atmospheric visibility change is had the control strategy of certain adaptivity.
Accompanying drawing explanation
In order to further illustrate rather than limit the above-mentioned implementation of the present invention, further to the present invention below in conjunction with the accompanying drawings
Illustrate, but the most therefore limit the present invention among described practical range.All these designs should be regarded as disclosed in this technology
Content and protection scope of the present invention.
Fig. 1 be the adaptive regulation method of windfinding radar optical antenna focal length of the present invention substantially realize block diagram.
Fig. 2 is the workflow diagram of Fig. 1 of the present invention.
In figure: control computer, 2 motor drivers, 3 focusing motors, 4 optical antennas, 41 secondary mirrors, 42 primary mirrors in 1.
Detailed description of the invention
Refering to Fig. 1.In a most preferred embodiment described below, described windfinding radar is that pulsed optical fibre laser surveys wind and thunder
Reach, the optical antenna focal length Automatic adjusument of pulsed optical fibre laser windfinding radar mainly by middle control computer 1 in sequential series,
Motor driver 2 and focusing motor 3, and be arranged in optical antenna 4, it is connected to secondary mirror 41 He on motor 3 of focusing
Primary mirror 42 collaborative work being distributed with optical axis with secondary mirror 41 realizes.Wherein, optical antenna 4 is transmitting-receiving unification aperture structure light altogether
Learning focusing antenna, described optical focusing antenna includes primary mirror 42 and the secondary mirror 41 being coaxially distributed, and primary mirror is positive lens groups, secondary mirror
For negative lens group, secondary mirror 41 is connected to focus on motor by frame for movement, and can be existed along antenna axis by focusing driven by motor
Motion in certain limit.Middle control computer 1 is connected motor driver 2, motor driver 2 by RS232 communication interface with in
Control computer realizes communication.Focusing motor accurately drives optical focusing antenna secondary mirror along antenna axis with the fixing small step-length of 10nm
Line moves within the specific limits.
According to the present invention, in windfinding radar, employing is controlled computer 1 and is received back to ripple range gate signal-to-noise ratio data, and
Built-in radar manipulation software and echo range gate setting value in middle control computer 1, the echo noise that radar manipulation software will count
Compare with setting value than range gate number up to standard, it is judged that whether the signal to noise ratio range gate up to standard number counted exceedes setting value 8；
When central control computer analyzes Wind field measurement signal to noise ratio range gate up to standard number less than setting value, automatically it is adjusted windfinding radar light
Learning antenna focal length, control focusing motor, along optical focusing antenna axis slow portable antenna secondary mirror, changes optical focusing antenna
Equivalent focal length；Computer is controlled according to focusing when the variation tendency of the signal to noise ratio range gate up to standard number of pre-test determines focusing side in Tong Shi
To, make radar signal to noise ratio range gate up to standard number be maintained at more than setting value, or when reaching maximum under the conditions of Real-Time Atmospheric, order
Focusing motor quits work, and updates focusing motor initial position, continues monitoring windfinding radar signal to noise ratio range gate up to standard number and sets
The relation of definite value, enters in the circulation of search pinpointed focus.
Echo-signal is analyzed by middle control computer 1, obtains each echo range gate signal-to-noise ratio data, when echo signal to noise ratio
When range gate number up to standard is less than radar manipulation software built-in setting value, control computer 1 sends motor movement order to motor driver,
Motor driver 2 receives middle control computer 1 focusing instruction rear drive focusing motor 3 and works, and controls focusing motor along optics
Focusing antenna axis slow portable antenna secondary mirror 41.Focusing motor 3 is under motor driver 2 controls, with fixing small step-length
The secondary mirror 41 of mobile optical antenna 4, secondary mirror 41 progressively moves forward and backward with initial position for starting point, changes optical focusing antenna
Equivalent focal length, until echo signal to noise ratio range gate up to standard number is higher than setting value；Control computer 1 in Tong Shi to survey according to focusing simultaneously
The variation tendency of the signal to noise ratio range gate up to standard number of amount determines correct focusing direction, makes radar signal to noise ratio range gate up to standard number protect
Hold more than setting value, or under the conditions of Real-Time Atmospheric, reach maximum.When signal to noise ratio range gate up to standard number, not up to this sets all the time
During definite value, then quit work when motor movement of focusing is to signal to noise ratio range gate up to standard number maximum, after the EOT end of timeout, reenter Jiao
Away from search circulation.
Refering to Fig. 2.For realizing the optical antenna Self Adaptive Control of pulsed optical fibre laser windfinding radar, LDV technique is controlled
Computer receives each echo range gate signal-to-noise ratio data；Middle control computer statistics signal to noise ratio range gate up to standard number also judges whether low
In setting value；If signal to noise ratio range gate up to standard number is more than or equal to setting value, then radar proceeds to measure, and need not change antenna burnt
Away from.If signal to noise ratio range gate up to standard number is less than setting value, then middle control computer sends motor movement order to motor driver, electricity
Machine driver control focusing driven by motor optical focusing antenna secondary mirror slowly moves along antenna axis, change optical focusing antenna etc.
Effect focal length.The trend of the signal to noise ratio range gate up to standard number that radar manipulation software plug-in is measured according to focusing simultaneously is just
True focusing direction.When signal to noise ratio range gate up to standard number is less than setting value, middle control computer controls focusing motor and seesaws, and tastes
Examination scans near former focal length, if radar signal to noise ratio range gate up to standard number changes to exceed the radar manipulation built-in setting value of software,
Middle control computer command focusing motor quits work, and continues the relation of monitoring radar signal to noise ratio range gate up to standard number and setting value；If
Radar signal to noise ratio range gate up to standard number the most not can exceed that setting value, then focusing motor movement is maximum to signal to noise ratio range gate up to standard number
Position quits work, and suspends focus search, reenters focus search circulation after the EOT end of timeout.
Above-mentioned implementation can realize one by one according to following job step: after radar manipulation software starts, middle control computer 1
Control focusing motor to playback initial position, proceed by Wind field measurement.Middle control computer 1 obtains according to by echo-signal analysis
Echo range gate signal-to-noise ratio data, Statistic analysis signal to noise ratio range gate up to standard number whether exceed radar manipulation the built-in setting value of software,
If signal to noise ratio range gate up to standard number exceedes setting value, motor of focusing stops, and radar proceeds Wind field measurement；If signal to noise ratio is up to standard
Range gate number manipulates the built-in setting value of software less than radar, then middle control computer judges that focus search is complete no, if the most complete, adjusts
Burnt driven by motor antenna secondary mirror is finely tuned forward or backward along antenna axis, then carries out Wind field measurement, and middle control computer continues to judge
Signal to noise ratio range gate up to standard number manipulates the relation of the built-in setting value of software, if focus search is complete, then motor movement of focusing with radar
Quit work after the signal to noise ratio range gate up to standard number maximum position found in search and update focusing motor initial position, entering temporarily
Stop searching for timing, it is judged that after suspending search timing, be again introduced in the circulation of search pinpointed focus.
Claims (10)
1. the adaptive regulation method of a windfinding radar optical antenna focal length, it is characterised in that comprise the steps: in windfinding radar,
Employing is controlled computer (1) and is received back to ripple range gate signal-to-noise ratio data, and the manipulation of built-in radar is soft in middle control computer (1)
Part and echo range gate setting value, the echo signal to noise ratio range gate up to standard number counted is carried out by radar manipulation software with setting value
Relatively, it is judged that whether the signal to noise ratio range gate up to standard number counted exceedes setting value；Wind field measurement noise analyzed by central control computer
During than range gate number up to standard less than setting value, be automatically adjusted windfinding radar optical antenna focal length, control focusing motor along
Optical focusing antenna axis slow portable antenna secondary mirror, changes the equivalent focal length of optical focusing antenna；In Tong Shi control computer according to
Focusing determines focusing direction when the variation tendency of the signal to noise ratio range gate up to standard number of pre-test, makes radar signal to noise ratio range gate up to standard number
It is maintained at more than setting value, or when reaching maximum under the conditions of Real-Time Atmospheric, order focusing motor quits work, and updates focusing
Motor initial position, continues the relation of monitoring windfinding radar signal to noise ratio range gate up to standard number and setting value, enters search pinpointed focus
Circulation in.
2. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: described survey wind
Radar is pulsed optical fibre laser windfinding radar, and the optical antenna focal length Automatic adjusument of pulsed optical fibre laser windfinding radar mainly passes through
Middle control computer (1), motor driver (2) and focusing motor (3) in sequential series, and it is arranged on optical antenna (4)
In, it is connected to the secondary mirror (41) in focusing motor (3) and the collaborative work of primary mirror (42) being distributed with secondary mirror (41) with optical axis
Realize.
3. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: optical antenna (4)
For transmitting-receiving unification aperture structure optical focusing antenna altogether, described optical focusing antenna includes primary mirror (42) and the secondary mirror being coaxially distributed
(41), primary mirror is positive lens groups, and secondary mirror is negative lens group, and secondary mirror (41) is connected to focus on motor by frame for movement,
And moved within the specific limits along antenna axis by focusing motor (3) drive.
4. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: focusing motor with
The fixing small step-length of 10nm accurately drives the secondary mirror (41) of optical focusing antenna to move within the specific limits along antenna axis.
5. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 3, it is characterised in that: middle control computer
(1) echo-signal is analyzed, obtains each echo range gate signal-to-noise ratio data, when echo signal to noise ratio range gate up to standard number is low
When radar manipulation software built-in setting value, middle control computer (1) sends motor movement order to motor driver, and motor drives
Dynamic device (2) receives middle control computer (1) focusing instruction rear drive focusing motor (3) work, control focusing motor along
Optical focusing antenna axis slow portable antenna secondary mirror (41).
6. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 4, it is characterised in that: focusing motor (3)
Under motor driver (2) controls, move the secondary mirror (41) of optical antenna (4), secondary mirror (41) with fixing small step-length
Progressively move forward and backward for starting point with initial position, change the equivalent focal length of optical focusing antenna, until echo signal to noise ratio distance up to standard
Door number is higher than setting value；The change of the signal to noise ratio range gate up to standard number that computer (1) is measured simultaneously is controlled according to focusing in Tong Shi
Trend determines correct focusing direction, makes radar signal to noise ratio range gate up to standard number be maintained at more than setting value, or at Real-Time Atmospheric
Under the conditions of reach maximum；When signal to noise ratio range gate up to standard number is not up to setting value all the time, focusing motor movement reaches to signal to noise ratio
Quit work during subject distance door number maximum, after the EOT end of timeout, reenter focus search circulation.
7. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: middle control computer
Receiving each echo range gate signal-to-noise ratio data, statistics signal to noise ratio range gate up to standard number also judges whether less than setting value；If noise
Than range gate number up to standard more than or equal to setting value, then radar proceeds to measure, and need not change antenna focal length.
8. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: if signal to noise ratio reaches
Subject distance door number is less than setting value, and middle control computer sends motor movement order to motor driver, and motor driver controls focusing
Driven by motor optical focusing antenna secondary mirror slowly moves along antenna axis, changes the equivalent focal length of optical focusing antenna.
9. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: radar manipulation is soft
The focusing direction that the trend of signal to noise ratio range gate up to standard number that part plug-in is measured according to focusing simultaneously is correct.
10. the adaptive regulation method of windfinding radar optical antenna focal length as claimed in claim 1, it is characterised in that: signal to noise ratio is up to standard
When range gate number is less than setting value, middle control computer controls focusing motor and seesaws, and attempts scanning near former focal length,
If radar signal to noise ratio range gate up to standard number changes to exceed the radar manipulation built-in setting value of software, middle control computer command focusing motor
Quit work, continue the relation of monitoring radar signal to noise ratio range gate up to standard number and setting value；If radar signal to noise ratio range gate up to standard number
The most not can exceed that setting value, then focusing motor movement quits work to signal to noise ratio range gate up to standard number maximum position, and suspends Jiao
Away from search, after the EOT end of timeout, reenter focus search circulation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106878622A (en) * | 2017-04-20 | 2017-06-20 | 长春欧意光电技术有限公司 | A kind of automatic focusing processing system and processing method |
| CN107643601A (en) * | 2017-11-09 | 2018-01-30 | 北京电子工程总体研究所 | One kind is based on CO2Laser tube light source expand and real-time focusing device |
| CN109061671A (en) * | 2018-05-24 | 2018-12-21 | 远景能源（江苏）有限公司 | A kind of device and method for improving LDV technique scene availability |
| CN109597213A (en) * | 2018-12-29 | 2019-04-09 | 深圳航星光网空间技术有限公司 | Draw the method and device of optical antenna outgoing beam optical axis |
| CN109597214A (en) * | 2018-12-29 | 2019-04-09 | 深圳航星光网空间技术有限公司 | The system for drawing optical antenna outgoing beam optical axis |
| CN112034611A (en) * | 2020-09-23 | 2020-12-04 | 航天科工微电子***研究院有限公司 | Method for quickly focusing by using secondary mirror deformable mirror |
| CN115657080A (en) * | 2022-12-29 | 2023-01-31 | 南京牧镭激光科技股份有限公司 | Self-adaptive adjustment method for wind measuring distance gate of laser radar |
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| CN115657080A (en) * | 2022-12-29 | 2023-01-31 | 南京牧镭激光科技股份有限公司 | Self-adaptive adjustment method for wind measuring distance gate of laser radar |
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