CN114721010A - Laser radar system for detecting bird condition in airport and working method thereof - Google Patents
Laser radar system for detecting bird condition in airport and working method thereof Download PDFInfo
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- CN114721010A CN114721010A CN202210356769.1A CN202210356769A CN114721010A CN 114721010 A CN114721010 A CN 114721010A CN 202210356769 A CN202210356769 A CN 202210356769A CN 114721010 A CN114721010 A CN 114721010A
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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
- G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
- G01S17/933—Lidar systems specially adapted for specific applications for anti-collision purposes of aircraft or spacecraft
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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
- G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
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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
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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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
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4865—Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak
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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
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Abstract
The invention provides an airport bird condition detection laser radar system and a working method thereof, wherein the airport bird condition detection laser radar system comprises the following steps: the device comprises a multi-beam laser emitting module, an optical receiving and detecting module, a signal collecting and processing module and a photoelectric scanning table; the multi-beam laser emission module is used for generating and emitting a multi-beam laser line array to irradiate a small-volume target according to a preset safe wavelength and a preset beam angle; the optical receiving and detecting module is used for receiving and converting the laser pulse signal scattered by the small-volume target so as to obtain a bird situation pulse electrical signal; the signal acquisition and processing module receives and processes the bird condition pulse electric signal and the pulse laser emission time so as to obtain flight target state detection data; the photoelectric scanning turntable is provided with a photoelectric motor box, and the multi-beam laser emission module, the optical receiving and detecting module and the signal acquisition and processing module are integrated in the photoelectric motor box and used for rotating and scanning airport bird conditions according to a preset view field. The technical problems of short detection distance, small detection view field and serious clutter interference are solved.
Description
Technical Field
The invention relates to an airport bird condition detection laser radar system and a working mode thereof, belongs to the field of radar detection, and particularly relates to an airport bird condition detection laser radar system and a working method thereof.
Background
With the rapid development of aviation industry in China and the continuous improvement of ecological environment, the frequency of bird collisions in China in recent years is increased continuously, and great threats are brought to personnel safety, economic property and the like. According to data reported annually around the world, more than 90% of bird strike events occur in areas above or around airports, and therefore bird strike prevention is one of the security issues that are highly valued at airports. The task of preventing the bird strike in the airport is to adopt various means and methods to prevent and control the bird damage in the airport, and avoid the occurrence of the bird hitting the aircraft to the maximum extent, thereby ensuring the flight safety. The advanced technology is utilized to detect the bird situation in time in the airport, and effective information and warning are provided for relevant personnel in the airport, so that the method is one of important means for reducing the occurrence of bird strike events.
The main problem of the prior airport is that the bird target can be effectively detected and positioned, and a plurality of technical difficulties exist. The microwave radar mainly detects targets according to the Doppler effect, and bird targets with low flying speed are difficult to identify; in addition, the microwave scattering characteristic of the bird target is poor, the bird target flies in an ultra-low altitude range which is below one hundred meters away from the ground, and the microwave radar is seriously interfered by ground clutter and is difficult to remotely detect and track. The acoustic means mainly depends on sound disturbance generated when the target flies for detection, the bird flying speed is very slow, the generated disturbance noise is very small, and the acoustic means is difficult to identify the bird from the surrounding environment noise. The principle of infrared detection is that the infrared radiation of a target is measured according to the temperature difference between the target and the environment, and because the temperature difference between the bird target and the environment is not obvious, the level of the generated infrared radiation is very low relative to the background of the environment, so that the infrared detection difficulty is high, and the long detection distance cannot be realized.
The invention patent with application number CN202010754986.7, entitled detection method for remote low-power bird-detecting radar, uses pulse type chirp signals as radar transmission signals through a radar transmission end, divides the radar detection distance into a near detection distance section and a far detection distance section, adopts a narrow-pulse radar transmission signal when detecting the near detection distance section, and adopts a medium-pulse radar transmission signal when detecting the far detection distance section; the radar controls the directional change of the wave beam, and three-dimensional full airspace coverage scanning of 0-360 degrees in azimuth direction and 0-90 degrees in elevation direction is realized. Meanwhile, the radar action distance is divided into a near action distance section and a far action distance section, the narrow pulse wave and the middle pulse wave are respectively adopted as transmitting signals to realize the detection of low power consumption, long distance and low blind distance of the radar, and meanwhile, the active phased array is combined with mechanical scanning to realize the full airspace coverage detection. Compared with detection means such as microwave, acoustics and infrared in the prior art, the optical scattering characteristic of the bird target is better, the target detection and ranging in all days can be realized by utilizing the laser active detection technology, and the bird target detection and ranging device has the advantages of high spatial resolution, accurate ranging precision, small influence of electromagnetic interference and the like. However, the divergence angle of laser is usually in the order of mrad, and the detection field of view is limited, so that the scanning efficiency of the laser detection technology in a large field of view is low; because the bird target volume is small, the laser echo power scattered in several kilometers is very weak, which is far lower than the noise level of the traditional photoelectric detection technology, and effective signal detection cannot be realized. In addition, in an airport practical application environment, the emitted laser needs to meet the eye safety of ground personnel and onboard personnel, so that the safe operation of the airport and the airplane is ensured. The prior art has the technical problems of short detection distance, small detection view field and serious clutter interference.
Disclosure of Invention
The invention aims to solve the technical problems of short detection distance, small detection field of view and serious clutter interference.
The invention adopts the following technical scheme to solve the technical problems: an airport bird detection lidar system comprising:
the device comprises a multi-beam laser emitting module, an optical receiving and detecting module, a signal collecting and processing module and a photoelectric scanning table;
the multi-beam laser emission module is an emission optical fiber device group and is used for irradiating a small-volume target by a multi-beam laser line array generated and emitted according to a preset safe wavelength and a preset beam angle, wherein the multi-beam laser line array is 1550nm human eye safe wavelength laser;
the optical receiving and detecting module is a photon receiver group and is used for receiving and converting the laser pulse signals scattered by the small-volume target so as to obtain bird situation pulse electrical signals, and the optical receiving and detecting module comprises a photoelectric detector which adopts an InGaAs/InP Geiger APD detector in a self-use operation mode to carry out photon counting detection on the bird situation pulse electrical signals;
the signal acquisition and processing module is connected with the multi-beam laser emission module and the optical receiving and detecting module, and receives and processes the bird condition pulse electrical signal and the pulse laser emission time to obtain flight target state detection data;
the photoelectric scanning turntable is provided with a photoelectric box, and the multi-beam laser emission module, the optical receiving and detecting module and the signal collecting and processing module are integrated in the photoelectric box and used for rotating and scanning airport bird conditions according to a preset view field.
The bird target detection system disclosed by the invention can be used for realizing bird target detection in a large view field range by adopting the fiber laser, fiber beam splitting and fiber array emission multi-beam laser linens, has the advantages of dense beam arrangement, high receiving and transmitting registration precision, full-fiber structure and the like, and is stable in performance and strong in environmental adaptability. The invention transmits and receives 1550nm human eye safe wavelength laser, adopts a free running mode InGaAs/InP Geiger APD detector to perform photon counting detection on echo signals, has the advantages of high detection sensitivity, accurate distance measurement and the like, and thus realizes the detection of extremely weak scattering signals of the bird target over several kilometers.
In a more specific aspect, the multi-beam laser emitting module includes: a pulse laser, a beam splitter, an optical fiber array and a beam expander,
the pulse laser is a nanosecond pulse fiber laser and is used for generating pulse laser with preset safe wavelength;
the beam splitter is an optical fiber beam splitting network, is connected with the pulse laser and is used for splitting the pulse laser, and controls the beam angle of the beam of the pulse laser to be smaller than the beam divergence angle so as to obtain split pulse laser;
the optical fiber array is used for converting the beam splitting pulse laser into the multi-beam laser line array;
the beam expander is arranged in the irradiation direction of the multi-beam laser array, is a projection type optical lens and is used for emitting the multi-beam laser array.
In a more specific aspect, the pulsed laser, which employs a directly modulated semiconductor seed source and a multi-stage fiber amplifier, produces a high repetition-frequency, narrow pulse width, large pulse energy laser.
In a more specific aspect, the optical receiving and detecting module includes: a receiving mirror, a receiving optical fiber array, an optical fiber filter and a photoelectric detector,
the receiving optical fiber array is coupled with the receiving mirror;
the receive mirror, which is a transmissive optical telescope, is coupled to the receive optical line array through the fiber filter for coupling the multi-beam laser line array onto the receive optical fiber array;
the optical fiber filter is a narrow-band tube optical fiber filter and is used for removing stray light of each optical fiber receiving signal in the multi-beam laser line array and coupling the multi-beam laser line array to the photoelectric detector.
In a more specific technical scheme, the optical fiber filter operates the InGaAs/InP Geiger APD detector in a negative feedback avalanche quenching mode.
The invention adopts a negative feedback avalanche quenching mode to enable the APD detector to operate freely, thereby realizing photon counting detection of extremely weak echo signals at any arrival time.
In a more specific technical scheme, the signal acquisition and processing module comprises an FPGA acquisition unit, an FPGA photon flight time unit and a data accumulation unit,
the FPGA acquisition unit realizes acquisition and processing of signals of the multi-path single photon detector by using an FPGA;
the FPGA photon flight time unit is connected with the FPGA acquisition unit and is used for precisely measuring photon flight time data in a mode of combining FPGA clock counting and carry chain counting;
the data accumulation unit is connected with the FPGA photon flight time unit and used for accumulating the photon flight time data of a plurality of pulse periods in real time through the FPGA so as to extract and detect a target signal.
In a more specific technical scheme, the photoelectric scanning turntable adopts a high-bearing precision U-shaped turntable, and the photoelectric motor box is arranged on a side arm of the U-shaped turntable.
The invention realizes the scanning of the multi-beam laser line array through the photoelectric turntable with the U-shaped structure, has the advantages of high bearing, large scanning range, high scanning speed and the like, and avoids the problem of image rotation of the multi-beam laser line array in the space.
In a more specific technical scheme, the photoelectric scanning turntable adopts a 360-degree continuous scanning mode in the azimuth direction, and is fixed in pointing direction in the pitching direction, so that the space above an airport is periodically and quickly scanned, and target three-dimensional coordinate data are generated and processed according to the azimuth direction of the photoelectric scanning turntable and the pitching direction of a laser line array.
In a more specific technical scheme, the airport bird condition detection laser radar system is arranged at the edge of an airport, and the installation height of the airport bird condition detection laser radar system is matched with the preset detection height.
The laser radar system for detecting bird conditions in the airport is arranged around the runway of the airport and is elevated, so that the detection of low-altitude flying birds and bird group targets below 100 meters in the range of several kilometers near the airport is realized.
In a more specific technical scheme, an airport bird situation detection laser radar working method is characterized by comprising the following steps:
irradiating a small-volume target by using a multi-beam laser line array generated and emitted by a multi-beam laser emission module according to a preset safe wavelength and a preset beam angle, wherein the multi-beam laser line array is 1550-nanometer human-eye safe wavelength laser;
receiving and converting the laser pulse signal scattered by the small-volume target by an optical receiving and detecting module to obtain a bird situation pulse electrical signal, wherein the optical receiving and detecting module comprises a photoelectric detector, and the photoelectric detector adopts a self-use operation mode InGaAs/InP Geiger APD detector to perform photon counting detection on the bird situation pulse electrical signal;
receiving and processing the bird condition pulse electric signal and the pulse laser emission moment by a signal acquisition and processing module so as to obtain flight target state detection data;
and a photoelectric chassis of the photoelectric scanning turntable is used for integrating the multi-beam laser emission module, the optical receiving and detecting module and the signal acquisition and processing module, and the photoelectric scanning turntable is used for rotating and scanning airport bird conditions according to a preset view field.
Compared with the prior art, the invention has the following advantages: the bird target detection system disclosed by the invention can be used for realizing bird target detection in a large view field range by adopting the fiber laser, fiber beam splitting and fiber array emission multi-beam laser linens, has the advantages of dense beam arrangement, high receiving and transmitting registration precision, full-fiber structure and the like, and is stable in performance and strong in environmental adaptability. The invention transmits and receives 1550nm human eye safe wavelength laser, adopts a free running mode InGaAs/InP Geiger APD detector to perform photon counting detection on echo signals, has the advantages of high detection sensitivity, accurate distance measurement and the like, and thus realizes the detection of extremely weak scattering signals of the bird target over several kilometers. The invention realizes the scanning of the multi-beam laser line array through the photoelectric turntable with the U-shaped structure, has the advantages of high bearing, large scanning range, high scanning speed and the like, and avoids the problem of image rotation of the multi-beam laser line array in the space. The invention solves the technical problems of short detection distance, small detection field of view and serious clutter interference in the prior art.
Drawings
Fig. 1 is a block diagram of an airport bird situation detection lidar system and its operation.
Fig. 2 is a schematic diagram of an airport bird situation detection laser radar system and its working mode of optical fiber beam splitting.
Fig. 3 is a schematic diagram of an optical fiber arrangement of an airport bird situation detection laser radar system and its operation mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, an airport bird situation detection laser radar system and its working method includes: the device comprises a multi-beam laser emitting module, an optical receiving and detecting module, a signal collecting and processing module and a photoelectric scanning turntable; the multi-beam laser emission module comprises a pulse laser, a beam splitter, an optical fiber array and a beam expander; the optical receiving and detecting module comprises a receiving mirror, an optical fiber array, an optical fiber filter and a photoelectric detector; the multi-beam laser emission module, the optical receiving and detecting module and the signal acquisition and processing module are integrated in a photoelectric machine box, and the photoelectric machine box is arranged on a photoelectric scanning turntable to realize large-field scanning in 360-degree azimuth;
as shown in FIG. 3, the system transmits and receives pulse laser with the wavelength of 1550nm, and the purpose of eye safety detection in an airport range is achieved; the multi-beam laser emission module generates 128 beam laser lines which are vertically arranged, the beam angle between beams is 1mard (beam peak energy 1/e2 position), and the beam divergence angle is 1mrad (beam peak energy 1/e2 position); the optical receiving and detecting module receives a pulse laser signal scattered by a target and is coupled to the photoelectric detector, and the photoelectric detector converts a pulse laser echo signal into a pulse electric signal; the signal acquisition and processing module measures the time interval between the pulse laser emission time and the pulse arrival time of the photoelectric detector, calculates the flight time, and realizes target signal detection and ranging.
As shown in fig. 2, the multi-beam laser emission module adopts a KEOPSYS PEFL series nanosecond pulse fiber laser, the pulse width is 6ns, the peak power is 25kW, the pulse energy is 150 μ J, and the output fiber is 25/125 μm few-mode fiber; as shown in FIGS. 2 and 3, a 128-beam laser line array is generated by 25/125-micron optical fiber beam splitting and 1 × 128 optical fiber close packing, and multi-beam laser line array emission is realized by adopting a transmission type optical lens with the aperture of 100mm and the focal length of 150 mm.
The optical receiving and detecting module adopts a transmission type optical telescope with the caliber of 100mm and the focal length of 150mm to couple the multi-beam laser line array to a 50/125 mu m optical fiber array with the diameter of 1 x 128; for signals received by each optical fiber, a 100GHz narrow-band optical fiber filter is adopted to remove stray light and is coupled to 128 paths of photoelectric detectors;
the photoelectric detector adopts an InGaAs/InP Geiger APD detector, and the reverse bias voltage applied to two ends of the APD detector is higher than the breakdown voltage of the APD detector, so that single photon sensitivity detection is realized; and a negative feedback avalanche quenching mode is adopted, so that the APD detector operates in free operation, and photon counting detection of extremely weak echo signals at any arrival time is realized.
The signal acquisition and processing module adopts an FPGA to realize the acquisition and processing of signals of a 128-path single photon detector; precisely measuring the photon flight time by combining FPGA clock counting and carry chain counting; and accumulating photon flight time data of a plurality of pulse periods in real time through the FPGA to realize target signal extraction and ranging.
The photoelectric scanning rotary table adopts a high-bearing precision U-shaped rotary table, and the photoelectric motor box is arranged on two side arms of the U-shaped rotary table, so that the large-field scanning of 360 degrees in direction is realized.
The photoelectric scanning turntable adopts a 360-degree continuous scanning mode in the azimuth direction, points and fixes in the pitching direction, and carries out 5-second periodic rapid scanning on the air above an airport; the system transmits 20kHz high repetition frequency pulse laser, and carries out pulse accumulation according to the residence time of the beam on a target; and when a target signal is detected, acquiring target three-dimensional coordinate data according to a pulse laser ranging result, the photoelectric scanning turntable azimuth direction and the laser linear array pitch direction.
The system is arranged around an airport runway and is elevated, so that the detection of low-altitude flying birds and bird group targets below 100 meters in the range of several kilometers near the airport is realized.
In conclusion, the bird target detection system disclosed by the invention realizes the detection of the bird target in a large visual field range by adopting the fiber laser, the fiber beam splitting and the fiber array to emit the multi-beam laser line array, has the advantages of dense beam arrangement, high receiving and transmitting registration precision, full-fiber structure and the like, and has stable performance and strong environmental adaptability. The invention transmits and receives 1550nm human eye safe wavelength laser, adopts a free running mode InGaAs/InP Geiger APD detector to perform photon counting detection on echo signals, has the advantages of high detection sensitivity, accurate distance measurement and the like, and thus realizes the detection of extremely weak scattering signals of the bird target over several kilometers. The invention realizes the scanning of the multi-beam laser line array through the photoelectric turntable with the U-shaped structure, has the advantages of high bearing, large scanning range, high scanning speed and the like, and avoids the problem of image rotation of the multi-beam laser line array in the space. The invention solves the technical problems of short detection distance, small detection field of view and serious clutter interference in the prior art.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An airport bird detection lidar system, comprising: the device comprises a multi-beam laser emitting module, an optical receiving and detecting module, a signal collecting and processing module and a photoelectric scanning table;
the multi-beam laser emission module is an emission optical fiber device group and is used for irradiating a small-volume target by a multi-beam laser line array generated and emitted according to a preset safe wavelength and a preset inter-beam angle, wherein the multi-beam laser line array is 1550 nanometer human eye safe wavelength laser;
the optical receiving and detecting module is a photon receiver group and is used for receiving and converting the laser pulse signals scattered by the small-volume target so as to obtain bird situation pulse electrical signals, and the optical receiving and detecting module comprises a photoelectric detector which adopts an InGaAs/InP Geiger APD detector in a self-use operation mode to carry out photon counting detection on the bird situation pulse electrical signals;
the signal acquisition and processing module is connected with the multi-beam laser emission module and the optical receiving and detecting module, and receives and processes the bird condition pulse electrical signal and the pulse laser emission time to obtain flight target state detection data;
the photoelectric scanning turntable is provided with a photoelectric box, and the multi-beam laser emission module, the optical receiving and detecting module and the signal collecting and processing module are integrated in the photoelectric box and used for rotating and scanning airport bird conditions according to a preset view field.
2. The airport bird detection lidar system of claim 1, wherein the multi-beam laser transmitting module comprises: a pulse laser, a beam splitter, an optical fiber array and a beam expander,
the pulse laser is a nanosecond pulse fiber laser and is used for generating pulse laser with preset safe wavelength;
the beam splitter is an optical fiber beam splitting network, is connected with the pulse laser and is used for splitting the pulse laser, and controls the beam angle of the beam of the pulse laser to be smaller than the beam divergence angle so as to obtain split pulse laser;
the optical fiber array is used for converting the beam splitting pulse laser into the multi-beam laser line array;
the beam expander is arranged in the irradiation direction of the multi-beam laser array, is a projection type optical lens and is used for emitting the multi-beam laser array.
3. The airport bird detection lidar system of claim 2, wherein the pulsed laser employs a directly modulated semiconductor seed source and a multi-stage fiber amplifier to produce high repetition rate, narrow pulse width, high pulse energy laser.
4. The airport bird detection lidar system of claim 1, wherein the optical receiving and detection module further comprises: a receiving mirror, a receiving optical fiber array, an optical fiber filter,
the receiving optical fiber array is coupled with the receiving mirror;
the receive mirror, which is a transmissive optical telescope, is coupled to the receive optical line array through the fiber filter for coupling the multi-beam laser line array onto the receive optical fiber array;
the optical fiber filter is a narrow-band tube optical fiber filter and is used for removing stray light of each optical fiber receiving signal in the multi-beam laser line array and coupling the multi-beam laser line array to the photoelectric detector.
5. The laser radar system for airport bird detection according to claim 4, wherein the fiber filter operates the InGaAs/InP Geiger APD detector with negative feedback avalanche quenching.
6. The laser radar system for detecting bird strike at airport according to claim 1, wherein said signal collection and processing module comprises FPGA collection unit, FPGA photon time-of-flight unit, and data accumulation unit,
the FPGA acquisition unit realizes acquisition and processing of signals of the multi-path single photon detector by using an FPGA;
the FPGA photon flight time unit is connected with the FPGA acquisition unit and is used for precisely measuring photon flight time data in a mode of combining FPGA clock counting and carry chain counting;
the data accumulation unit is connected with the FPGA photon flight time unit and used for accumulating the photon flight time data of a plurality of pulse periods in real time through the FPGA so as to extract and detect a target signal.
7. The laser radar system for detecting bird strike at airport according to claim 1, wherein said photoelectric scanning turntable is a high-bearing precision U-shaped turntable, and said photoelectric box is mounted on a side arm of said U-shaped turntable.
8. The laser radar system for detecting bird strike at airport according to claim 1, wherein the photoelectric scanning turntable adopts a 360 ° continuous scanning mode in azimuth direction and fixed in orientation direction in elevation direction, so as to perform periodic rapid scanning on the airport sky, and generate and process target three-dimensional coordinate data according to the azimuth orientation of the photoelectric scanning turntable and the elevation orientation of the laser line array.
9. The laser radar system for detecting bird strike at airport according to claim 1, wherein the laser radar system for detecting bird strike at airport is installed at the position of airport edge, and the installation height of the laser radar system is adapted to the preset detection height.
10. An airport bird detection laser radar working method is characterized by comprising the following steps:
irradiating a small-volume target by using a multi-beam laser line array generated and emitted by a multi-beam laser emission module according to a preset safe wavelength and a preset beam angle, wherein the multi-beam laser line array is 1550nm human eye safe wavelength laser;
receiving and converting the laser pulse signal scattered by the small-volume target by an optical receiving and detecting module to obtain a bird situation pulse electrical signal, wherein the optical receiving and detecting module comprises a photoelectric detector, and the photoelectric detector adopts a self-use operation mode InGaAs/InP Geiger APD detector to perform photon counting detection on the bird situation pulse electrical signal;
receiving and processing the bird condition pulse electric signal and the pulse laser emission moment by a signal acquisition and processing module so as to obtain flight target state detection data;
and a photoelectric chassis of the photoelectric scanning turntable is used for integrating the multi-beam laser emission module, the optical receiving and detecting module and the signal acquisition and processing module, and the photoelectric scanning turntable is used for rotating and scanning airport bird conditions according to a preset view field.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116828003A (en) * | 2023-08-30 | 2023-09-29 | 北京京航安机场工程有限公司 | Novel airport enclosure security intelligent control server |
| CN117075130A (en) * | 2023-07-07 | 2023-11-17 | 中国电子科技集团公司第三十八研究所 | Low-speed small target laser tracking device and working method thereof |
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2022
- 2022-04-06 CN CN202210356769.1A patent/CN114721010A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117075130A (en) * | 2023-07-07 | 2023-11-17 | 中国电子科技集团公司第三十八研究所 | Low-speed small target laser tracking device and working method thereof |
| CN116828003A (en) * | 2023-08-30 | 2023-09-29 | 北京京航安机场工程有限公司 | Novel airport enclosure security intelligent control server |
| CN116828003B (en) * | 2023-08-30 | 2023-11-07 | 北京京航安机场工程有限公司 | Airport enclosure security intelligent control server |
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