CN112946637A - Radar system and method for differential interference double-station synchronous scanning high-resolution imaging - Google Patents
Radar system and method for differential interference double-station synchronous scanning high-resolution imaging Download PDFInfo
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- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G—PHYSICS
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- 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
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention belongs to the technical field of radar detection of airport runway deformation, and particularly relates to a radar system for differential interference double-station synchronous scanning high-resolution imaging, which comprises: the main coherent millimeter wave radar, the auxiliary coherent millimeter wave radar, the main frame elevated track and the auxiliary frame elevated track; the main coherent millimeter wave radar is arranged on the main elevated track, and the auxiliary coherent millimeter wave radar is arranged on the auxiliary elevated track; the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar can respectively and correspondingly synchronously slide on the main frame elevated track and the auxiliary frame elevated track, and the main frame elevated track and the auxiliary frame elevated track are arranged at two ends or two sides of the airport runway in parallel; the main coherent millimeter wave radar and the main coherent millimeter wave radar are respectively provided with a double parabolic antenna or a horn or a waveguide slot array for transmitting and receiving signals; the system utilizes two sets of radar equipment to realize high-resolution foreign object detection and airfield runway deformation detection of each airfield runway, and is easy to realize.
Description
Technical Field
The invention belongs to the technical field of radar detection of airport runway deformation, and particularly relates to a radar system and a method for differential interference double-station synchronous scanning high-resolution imaging.
Background
The takeoff and landing of the airplane are the most concerned stages of flight safety, the airport runway is an important facility for the takeoff and landing of the airplane, the safety is the most important in the management of the airport flight area, and no foreign matter or runway deformation can be generated on the runway so as not to influence the flight safety.
On 30.9.2009, FAA officially released a consultation notice of "airport foreign body detection facility" (AC No: 150/5220-24). In the advisory notice, it is clear that an airport foreign object is a foreign substance, debris or object that may damage the aircraft or system. Foreign objects that may damage the aircraft, such as metal parts, plastic cloth, chippings, paper dust, leaves, carcasses of animals, birds, etc., may all be referred to as airport foreign objects.
The aircraft is very fragile to foreign matters, the engine sucks foreign matters to possibly cause air parking, the screws, metal stones and the like can possibly cause tire damage and even burst, the foreign matters burst to possibly damage important parts such as the aircraft body, the engine or an oil tank, a hydraulic pipe and the like, so that economic loss is caused, and safety accidents are caused in serious cases. In 2000, the French aviation coordination and the airplane crash were caused by metal fragments falling from another airplane, and the accident caused 113 people to be in distress. Collaborate with the aircraft so the accident was completely retired 10 months in 2003.
At present, foreign objects on airfield runways and runway deformation detection mainly adopt manual visual inspection, infrared and visible light and radar detection technologies. However, manual visual inspection of the airport has some disadvantages, such as shutdown of the runway and reduction of airport capacity; the foreign matters and deformation of the airport are not found by the patrolman due to the poor weather condition; the airport foreign matter event and runway deformation analysis and tracing management cannot be carried out, and the adverse factors of low efficiency, low detection rate and complex airport scheduling exist. The infrared and visible light are greatly influenced by weather, and the detection of tiny targets is difficult.
Different from infrared light and visible light, the millimeter wave has a certain penetrating effect on cloud and rain atmosphere, is slightly influenced by weather, can work all day long, and has the advantages of large radar scanning coverage, high imaging resolution, high weak and small target detection rate, high scanning efficiency and the like. Currently, there are 4 international main runway foreign body automatic detection and identification systems, which are respectively a Tarsier system developed in the uk, a FODetect system developed in israel, a FODFinder system developed in the usa and an IFerret system developed in singapore, and the systems of these companies respectively or comprehensively adopt infrared/visible light and microwave radar technologies.
Among them, Tarsier1100(T1100) developed by QinetiQ corporation, uk is the first airport foreign body automatic radar detection system worldwide. The Tarsier system adopts FMCW (frequency modulated continuous wave) system radar and works in the W frequency band (94.5 GHz). The system adopts a tower structure to scan the airport runway in a sector or 360 degrees, the number of radars in the system is small, and the scanning efficiency is high; however, in this system, the azimuth resolution is limited by the radar beam width, and the resolution is low.
The FODdetect system was developed by Xsight corporation. The system consists of a plurality of detection units arranged along a runway. Each detection unit consists of a millimeter wave radar (77GHz) and a camera device, and all the units work cooperatively to monitor the foreign matters on the runway of the whole airport. By adopting the video identification technology, the detection result can be confirmed after the millimeter wave radar detects the airport foreign matter, so that the false alarm probability is greatly reduced. The system can borrow runway lamp positions, does not need special infrastructure and has high scanning efficiency; however, the azimuth resolution is limited by the radar beam width and is low.
The FOD Finder system was developed by the company Trex Enterprises in the United states. The vehicle-mounted mobile GPS system is characterized in that the vehicle-mounted mobile GPS system can move on a vehicle, and comprises a radar, a camera system and a GPS positioning system. The radar is arranged in a radar cover of the vehicle roof, and adopts a millimeter wave band, and the working frequency is between 78 and 81 GHz. The system can be moved, but the runway needs to be closed when in use, so that the take-off and landing efficiency of the airport is reduced.
The ifrret developed by Stratech, singapore is a set of video detection systems. The detection of the airport foreign matter is realized by a camera and image processing software. However, this system is not a radar system and has weather limitations.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a radar system and a method for differential interference double-station synchronous scanning high-resolution imaging, wherein the double-station synchronous scanning high-resolution millimeter wave imaging radar system is adopted to realize high resolution in the length direction of an airport runway by using a large-bandwidth signal; realizing beam scanning on the elevated track, and improving the resolution of the radar along the width direction of the airport runway by utilizing the synthetic aperture; differential interference is formed among multiple scans on the track, so that the micro-deformation detection capability of the airport runway is achieved. In addition, the all-weather and all-day-time continuous monitoring of the double-station synchronous scanning high-resolution millimeter wave imaging radar system is utilized, the accuracy and the timeliness of foreign object detection and runway deformation on the airport runway are improved, and the method has very important significance.
In order to achieve the above object, the present invention provides a radar system for differential interference dual-station synchronous scanning high resolution imaging, comprising:
the main coherent millimeter wave radar, the auxiliary coherent millimeter wave radar, the main frame elevated track and the auxiliary frame elevated track;
the main coherent millimeter wave radar is arranged on the main elevated track, and the auxiliary coherent millimeter wave radar is arranged on the auxiliary elevated track; the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar can respectively and correspondingly synchronously slide on the main frame elevated track and the auxiliary frame elevated track, and the main frame elevated track and the auxiliary frame elevated track are arranged at two ends or two sides of the airport runway in parallel; and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are respectively provided with a double parabolic antenna or a horn or a waveguide slot array for transmitting and receiving signals.
As one improvement of the technical scheme, two parabolic antennas in the double parabolic antennas are placed up and down; the parabolic antenna positioned above is used as a signal transmitting antenna for transmitting signals; the lower parabolic antenna is used as a signal receiving antenna for receiving signals.
As one improvement of the technical proposal, the length of the high track of the main frame is larger than the width or the length of the airport runway; the length of the auxiliary elevated track is greater than the width or length of the airport runway.
As an improvement of the technical scheme, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar both adopt a millimeter wave window frequency band of 92-97GHz, the signal forms of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are frequency modulated continuous waves, the signal bandwidth is greater than or equal to 5GHz, and the imaging resolution ratio of less than or equal to 3 cm is respectively realized in the distance direction and the azimuth direction.
As one improvement of the above technical solution, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar adopt a ping-pong transmission mode based on a two-station radar, the main coherent millimeter wave radar or the auxiliary coherent millimeter wave radar transmits signals, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, then the auxiliary coherent millimeter wave radar or the main coherent millimeter wave radar transmits signals, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, thereby forming a closed cycle.
As an improvement of the above technical solution, the main coherent millimeter wave radar includes:
the system comprises a transmitting antenna, a receiving antenna, a transmitting link, a receiving link, a direct digital synthesis signal generator, a continuous wave source, a high-stability crystal oscillator, a data acquisition module, a data storage module, an imaging processing module, a time schedule controller and a microwave → light conversion module;
the high-stability crystal oscillator is respectively connected with the direct digital synthesis signal generator, the continuous wave source, the data acquisition module, the time schedule controller and the microwave → light conversion module; the direct digital synthesis signal generator and the continuous wave source are respectively connected with a transmitting link, and the transmitting link is connected with a transmitting antenna; the data acquisition module is respectively connected with the data storage module, the imaging processing module and the receiving link; the imaging processing module is connected with the data storage module, and the receiving link is connected with the receiving antenna;
the transmitting link comprises a power amplifier, a power divider, an amplifier, a quadrupler, a first band-pass filter and a first mixer which are sequentially connected;
the receiving link comprises a low noise amplifier, a second mixer, a second band-pass filter and a baseband amplifier which are sequentially connected in sequence;
after the radar is started, a 100MHz reference oscillation frequency signal generated by a high-stability crystal oscillator is sent to a continuous wave source, and the continuous wave source generates a 22.8GHz first local oscillation signal required by a first frequency mixer; meanwhile, a 100MHz reference oscillation frequency signal is provided for a digital synthesis signal generator DDS, the digital synthesis signal generator DDS generates a baseband frequency modulation continuous wave signal of 0.2-1.45 GHz, and the baseband frequency modulation continuous wave signal is used as an input signal of a first frequency mixer; the first mixer modulates the baseband frequency modulation continuous wave signal to 23-24.25 GHz, outputs the continuous wave signal and sends the continuous wave signal to a post-stage band-pass filter; the band-pass filter filters stray and harmonic components in the continuous wave signal to obtain a filtered signal, and then the filtered signal is sent to the quadrupler; the four-frequency multiplier multiplies the frequency of the 23-24.25 GHz filtered signal to 92-97GHz frequency-multiplied signal, the frequency-multiplied signal is amplified by an amplifier to obtain an amplified signal, the amplified signal is divided into two paths by a power divider, one path of the amplified signal is continuously amplified by a power amplifier and is sent to a transmitting antenna, and the amplified signal is radiated to a preset target area in the form of electromagnetic waves through the transmitting antenna; and the other path of the signal is provided to a second mixer in the receiving chain as a mixing local oscillator signal of 92-97 GHz.
Electromagnetic wave signals radiated by the transmitting antenna are reflected or scattered after meeting a preset target; wherein, the backward scattering signal returns to the receiving antenna at one side of the transmitting antenna, and the forward scattering signal enters the receiving antenna of the auxiliary coherent millimeter wave radar.
After receiving the reflected or scattered electromagnetic wave signal, the receiving antenna amplifies the electromagnetic wave signal by a low noise amplifier and sends the amplified electromagnetic wave signal to a second mixer; the second frequency mixer mixes the echo signal with a 92-97GHz mixing local oscillator signal provided by the transmitting link power divider to generate a baseband signal; the baseband signal is filtered by a second band-pass filter and then sent to a baseband amplifier for amplification, and an analog baseband signal is obtained; the data acquisition module converts the analog baseband signal into a digital signal and divides the digital signal into two paths, wherein one path is sent to the data storage module for storage, and the other path is sent to the imaging processing module; the imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired digital signals to obtain a target image, and sends the target image to the data storage module; the data storage module packages the digital signal and the target image to form packaged data and sends the packaged data to the system controller.
As an improvement of the above technical solution, the auxiliary coherent millimeter wave radar includes:
the system comprises an auxiliary transmitting antenna, an auxiliary receiving antenna, an auxiliary transmitting link, an auxiliary receiving link, an auxiliary data acquisition module, an auxiliary data storage module, an auxiliary imaging processing module and an auxiliary time schedule controller;
the auxiliary transmitting antenna is connected with the auxiliary transmitting link, the auxiliary transmitting link is connected with the auxiliary time schedule controller, the auxiliary time schedule controller is connected with the auxiliary data acquisition module, the auxiliary data acquisition module is respectively connected with the auxiliary data storage module, the auxiliary imaging processing module and the auxiliary receiving link, the auxiliary data storage module is connected with the auxiliary imaging processing module, and the auxiliary receiving link is connected with the auxiliary receiving antenna;
the auxiliary transmitting link comprises an auxiliary power amplifier, an auxiliary power divider, an auxiliary amplifier, an auxiliary quadrupler, a first auxiliary band-pass filter and an optical → microwave conversion module which are sequentially connected;
the auxiliary receiving link comprises an auxiliary low noise amplifier, an auxiliary mixer, a second auxiliary band-pass filter and a baseband amplifier which are sequentially connected;
the method comprises the steps that a main coherent millimeter wave radar converts a signal of 23-24.25 GHz into an optical signal through a microwave → optical conversion module and sends the optical signal to a light → microwave conversion module of an auxiliary coherent millimeter wave radar through an optical fiber, the optical signal is converted into a microwave signal through the light → microwave conversion module and is input into a first auxiliary band-pass filter for filtering to obtain an auxiliary filtering signal, the auxiliary filtering signal is input into an auxiliary quadrupler for frequency multiplication to obtain an auxiliary frequency multiplication signal and is input into an auxiliary amplifier for signal amplification to obtain an auxiliary amplification signal, the auxiliary amplification signal is divided into two paths through an auxiliary power divider, one path is continuously amplified through an auxiliary power amplifier to obtain an auxiliary continuous amplification signal, the auxiliary continuous amplification signal is sent to an auxiliary transmitting antenna, and the auxiliary transmitting antenna radiates to a preset target area; the other path of the signal is provided for an auxiliary frequency mixer in an auxiliary receiving link to be used as an auxiliary frequency mixing local oscillator signal of 92-97 GHz;
after receiving the reflected or scattered electromagnetic wave signals, the auxiliary receiving antenna amplifies the reflected or scattered electromagnetic wave signals by the auxiliary low-noise amplifier and sends the amplified electromagnetic wave signals to the auxiliary mixer; the auxiliary frequency mixer mixes the echo signal with a 92-97GHz auxiliary frequency mixing local oscillator signal provided by the auxiliary transmitting link power divider to generate an auxiliary baseband signal; the auxiliary baseband signal is filtered by a second auxiliary band-pass filter and then sent to an auxiliary baseband amplifier for amplification, so that an auxiliary analog baseband signal is obtained; the auxiliary data acquisition module converts the auxiliary analog baseband signal into an auxiliary digital signal and divides the auxiliary digital signal into two paths, wherein one path is sent to the auxiliary data storage module for storage, and the other path is sent to the auxiliary imaging processing module; the auxiliary imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired auxiliary digital signals to obtain an auxiliary target image, and sends the auxiliary target image to the auxiliary data storage module; the auxiliary data storage module packs the auxiliary digital signal and the auxiliary target image to form auxiliary packed data, and sends the auxiliary packed data to the system controller.
The invention also provides a method for a radar system based on differential interference double-station synchronous scanning high-resolution imaging, which is realized by the system and comprises the following steps:
the beam axes of the double parabolic antennas point to the central position close to the landing area;
when the main coherent millimeter wave radar slides to a certain position of the main frame high track, the transmitting antenna radiates an electromagnetic wave signal to a first landing area, the electromagnetic wave signal enters a receiving antenna of the main coherent millimeter wave radar together with a backward reflection signal generated after the action of a preset target on the first landing area, meanwhile, the electromagnetic wave signal and a forward scattering signal generated after the action of the preset target on the first landing area enter an auxiliary receiving antenna of an auxiliary coherent millimeter wave radar sliding to a corresponding position, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the first landing area of the airport runway at the position of the main frame high track;
then, the auxiliary coherent millimeter wave radar transmitting antenna radiates electromagnetic wave signals to a second landing area, backward reflection signals generated after the backward reflection signals and preset targets on the second landing area react enter a receiving antenna of the auxiliary coherent millimeter wave radar, meanwhile, forward scattering signals generated after the electromagnetic wave signals and the preset targets on the second landing area react enter a receiving antenna of a main coherent millimeter wave radar, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the second landing area of the airport runway at the elevated track position;
in the sliding process of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar on the corresponding elevated track, through the steps, echo signals of preset targets are obtained at different positions of the corresponding elevated track and are used as azimuth signals; carrying out synthetic aperture radar imaging processing on the distance direction signal and the azimuth direction signal obtained in the process, namely the two-dimensional data of the distance direction and the azimuth direction, so as to obtain a two-dimensional image of the runway of the airport;
comparing the two-dimensional image of the airport runway with the initial image of the airport runway, and judging whether the airport runway is deformed or not according to the comparison result;
specifically, if the two-dimensional image of the airport runway is the same as the initial image of the airport runway, the airport runway is not deformed;
if the two-dimensional image of the airport runway is not the same as the initial image of the airport runway, the airport runway is deformed.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a novel high-resolution millimeter wave imaging system for detecting the deformation of an airport runway and the foreign objects on the airport runway, which improves the imaging resolution compared with other systems for detecting the deformation of the airport runway and the foreign objects on the airport runway, increases the detection function of the micro deformation of the airport runway and improves the integral detection capability; the invention realizes the high-resolution foreign object detection and the deformation detection of the airport runway by using two sets of radar equipment, and is easy to realize;
2. the invention adopts millimeter waves, thereby improving the all-weather all-day working capability;
3. the invention adopts the large bandwidth signal, thus improving the range resolution of the radar;
4. the synthetic aperture is formed by rail sliding, so that the azimuth imaging resolution of the radar is improved, and the detection rate of weak and small targets is improved;
5. according to the invention, the foreign object information of the airport runway is obtained by utilizing the phase interference among a plurality of images, so that the foreign object detection rate is improved;
6. the method utilizes the phase interference among a plurality of images to obtain the runway micro-deformation information, thereby enhancing the detection capability of the airport runway micro-deformation;
7. the method adopts a synchronous scanning mode of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar, simultaneously obtains the forward scattering information and the backward scattering information of the target, and improves the detection rate and the recognition rate of foreign objects on the airfield runway;
8. the method adopts a complementary enhancement mode of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar, and improves the detection rate and the recognition rate of foreign objects by combining the echo signal of a near landing area irradiated by the main coherent millimeter wave radar with the forward scattering signal of the auxiliary coherent millimeter wave radar;
9. the invention utilizes the light transmission microwave to ensure that the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar keep the system coherence, and the signals respectively acquired by the two radars can be subjected to coherent accumulation, thereby improving the detection rate of foreign objects on the airfield runway.
Drawings
FIG. 1 is a schematic structural diagram of a radar system for differential interference dual-station synchronous scanning high-resolution imaging according to the present invention;
FIG. 2 is a schematic structural diagram of a radar system for differential interference dual-station synchronous scanning high-resolution imaging for dual-station observation according to the present invention;
FIG. 3 is a schematic structural diagram of a main coherent millimeter wave radar of a radar system for differential interference dual-station synchronous scanning high-resolution imaging according to the present invention;
FIG. 4 is a schematic structural diagram of an auxiliary coherent millimeter wave radar of the radar system for differential interference dual-station synchronous scanning high-resolution imaging according to the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
As shown in figures 1 and 2, the invention provides a radar system for differential interference double-station synchronous scanning high-resolution imaging, which utilizes millimeter wave radar imaging, differential interference measurement, double-station radar observation and synchronous scanning to improve the imaging resolution of the system, the detection capability of the small and weak targets of the foreign objects on the airfield runway and the detection capability of the micro-deformation of the airfield runway, thereby meeting the safety requirements on the accurate detection of the deformation of the runway and the foreign objects on the runway. In addition, the detection of the small and weak targets of the foreign objects on the airfield runway and the detection of the micro-deformation of the airfield runway are realized by combining the synthetic aperture, the double-station radar observation and the differential interference measurement.
The system comprises: the main coherent millimeter wave radar, the auxiliary coherent millimeter wave radar, the main frame elevated track and the auxiliary frame elevated track;
the main coherent millimeter wave radar is arranged on the main elevated track, and the auxiliary coherent millimeter wave radar is arranged on the auxiliary elevated track; the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar can respectively and correspondingly synchronously slide on the main frame elevated track and the auxiliary frame elevated track, and the main frame elevated track and the auxiliary frame elevated track are arranged at two ends or two sides of the airport runway in parallel; and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are respectively provided with a double parabolic antenna or a horn or a waveguide slot array for transmitting and receiving signals. As shown in fig. 1, in the present embodiment, the main elevating rail and the auxiliary elevating rail are placed in parallel with each other at both ends of the airport runway; and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are respectively provided with a double-paraboloid antenna for transmitting and receiving signals.
The connecting line of the end points on the same side of the main frame elevated rail and the auxiliary frame elevated rail is vertical to the airport runway, and the connecting line of the end points on the same side of the main frame elevated rail and the auxiliary frame elevated rail is vertical to the main frame elevated rail and the auxiliary frame elevated rail respectively.
Two parabolic antennas in the double parabolic antennas are placed up and down; the parabolic antenna positioned above is used as a signal transmitting antenna for transmitting signals; the lower parabolic antenna is used as a signal receiving antenna for receiving signals.
The length of the main frame high track is larger than the width or length of the airport runway; the length of the auxiliary elevated track is greater than the width or length of the airport runway. The height of the main frame high track and the auxiliary frame high track is set according to the height of the fence outside the airport runway, and the height of the main frame high track and the auxiliary frame high track is slightly higher than the height of the fence outside the airport runway, preferably 2-6 meters. Wherein, the main frame high track and the auxiliary frame high track are all arranged oppositely along the width or length direction of the airport runway. In this embodiment, the length of the main frame high track is greater than the width of the airport runway; the length of the auxiliary elevated track is greater than the width of the airport runway. The main frame high track and the auxiliary frame high track are arranged oppositely along the width direction of the airport runway.
The main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar both adopt a millimeter wave window frequency band of 94GHz, the signal form of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar is frequency modulated continuous waves, the signal bandwidth is 5GHz, and 3 cm imaging resolution is respectively realized in the distance direction and the azimuth direction.
The main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar synchronously slide from one end of the respective elevated track to the other end to scan the airport runway at a constant speed, and a synthetic aperture is formed by scanning to generate a frame of airport runway width image, thereby realizing high-resolution imaging in the airport runway width direction.
Meanwhile, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar synchronously slide to the other end of each elevated track from one end of the elevated track to scan the airport runway at a constant speed by adopting a large-bandwidth signal (more than or equal to 5GHz), and form a real aperture through scanning to generate a frame of image of the length of the airport runway, thereby realizing high-resolution imaging in the length direction of the airport runway.
The main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar synchronously slide under the control of the system controller to perform uniform scanning, so that the emission of one coherent millimeter wave radar is realized, and a signal receiving system received by the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar can observe a target in a backward scattering mode and a forward scattering mode at the same time, so that the detection rate is improved; the transmission based on the double-station radar adopts a ping-pong mode, namely a main coherent millimeter wave radar or an auxiliary coherent millimeter wave radar transmits signals, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, then the auxiliary coherent millimeter wave radar or the main coherent millimeter wave radar transmits signals, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, and the steps are repeated.
The imaging technology is combined with a real aperture technology and a synthetic aperture technology, and the aperture required by imaging is realized through a main frame elevated rail and an auxiliary frame elevated rail which are erected at two ends or two sides of an airport runway.
As shown in fig. 3, the main coherent millimeter wave radar includes:
the system comprises a transmitting antenna, a receiving antenna, a transmitting link, a receiving link, a direct digital synthesis signal generator (DDS), a continuous wave source, a high-stability crystal oscillator, a data acquisition module, a data storage module, an imaging processing module, a time schedule controller and a microwave → light conversion module;
the high-stability crystal oscillator is respectively connected with the direct digital synthesis signal generator, the continuous wave source, the data acquisition module, the time schedule controller and the microwave → light conversion module; the direct digital synthesis signal generator and the continuous wave source are respectively connected with a transmitting link, and the transmitting link is connected with a transmitting antenna; the data acquisition module is respectively connected with the data storage module, the imaging processing module and the receiving link; the imaging processing module is connected with the data storage module, and the receiving link is connected with the receiving antenna;
the transmitting link comprises a power amplifier, a power divider, an amplifier, a quadrupler, a first band-pass filter and a first mixer which are sequentially connected;
the receiving link comprises a low noise amplifier, a second mixer, a second band-pass filter and a baseband amplifier which are sequentially connected in sequence;
after the radar is started, a 100MHz reference oscillation frequency signal generated by a high-stability crystal oscillator is sent to a continuous wave source, and the continuous wave source generates a 22.8GHz first local oscillation signal required by a first frequency mixer; meanwhile, a 100MHz reference oscillation frequency signal is provided for a digital synthesis signal generator DDS, the digital synthesis signal generator DDS generates a baseband frequency modulation continuous wave signal of 0.2-1.45 GHz, and the baseband frequency modulation continuous wave signal is used as an input signal of a first frequency mixer; the first mixer modulates the baseband frequency modulation continuous wave signal to 23-24.25 GHz, outputs the continuous wave signal and sends the continuous wave signal to a post-stage band-pass filter; the band-pass filter filters stray and harmonic components in the continuous wave signal to obtain a filtered signal, and then the filtered signal is sent to the quadrupler; the four-frequency multiplier multiplies the frequency of the 23-24.25 GHz filtered signal to 92-97GHz frequency-multiplied signal, the frequency-multiplied signal is amplified by an amplifier to obtain an amplified signal, the amplified signal is divided into two paths by a power divider, one path of the amplified signal is continuously amplified by a power amplifier and is sent to a transmitting antenna, and the amplified signal is radiated to a preset target area in the form of electromagnetic waves through the transmitting antenna; and the other path of the signal is provided to a second mixer in the receiving chain as a mixing local oscillator signal of 92-97 GHz.
Electromagnetic wave signals radiated by the transmitting antenna are reflected or scattered after meeting a preset target; wherein the backward scattering signal returns to the receiving antenna at one side of the transmitting antenna, and the forward scattering signal enters the receiving antenna of the auxiliary coherent millimeter wave radar.
After receiving reflected or scattered electromagnetic wave signals (echo signals) by the receiving antenna, amplifying the reflected or scattered electromagnetic wave signals by the low-noise amplifier and sending the signals to the second mixer; the second frequency mixer mixes the echo signal with a 92-97GHz mixing local oscillator signal provided by the transmitting link power divider to generate a baseband signal; the baseband signal is filtered by a second band-pass filter and then sent to a baseband amplifier for amplification, and an analog baseband signal is obtained; the data acquisition module converts the analog baseband signal into a digital signal and divides the digital signal into two paths, wherein one path is sent to the data storage module for storage, and the other path is sent to the imaging processing module; the imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired digital signals to obtain a target image, and sends the target image to the data storage module; the data storage module packages the digital signal and the target image to form packaged data and sends the packaged data to the system controller.
In addition, the microwave → optical conversion module in the main coherent millimeter wave radar sends the 23-24.25 GHz filtered signal to the auxiliary coherent millimeter wave radar to generate a local oscillation signal required by a mixer of the auxiliary coherent millimeter wave radar.
Further, a microwave → optical conversion module, an optical → microwave conversion module, and an optical fiber for signal transmission are provided between the two stations.
As shown in fig. 4, the auxiliary coherent millimeter wave radar includes:
the system comprises an auxiliary transmitting antenna, an auxiliary receiving antenna, an auxiliary transmitting link, an auxiliary receiving link, an auxiliary data acquisition module, an auxiliary data storage module, an auxiliary imaging processing module and an auxiliary time schedule controller;
the auxiliary transmitting antenna is connected with the auxiliary transmitting link, the auxiliary transmitting link is connected with the auxiliary time schedule controller, the auxiliary time schedule controller is connected with the auxiliary data acquisition module, the auxiliary data acquisition module is respectively connected with the auxiliary data storage module, the auxiliary imaging processing module and the auxiliary receiving link, the auxiliary data storage module is connected with the auxiliary imaging processing module, and the auxiliary receiving link is connected with the auxiliary receiving antenna;
the auxiliary transmitting link comprises an auxiliary power amplifier, an auxiliary power divider, an auxiliary amplifier, an auxiliary quadrupler, a first auxiliary band-pass filter and an optical → microwave conversion module which are sequentially connected;
the auxiliary receiving link comprises an auxiliary low noise amplifier, an auxiliary mixer, a second auxiliary band-pass filter and a baseband amplifier which are sequentially connected;
the method comprises the steps that a main coherent millimeter wave radar converts a signal of 23-24.25 GHz into an optical signal through a microwave → optical conversion module and sends the optical signal to a light → microwave conversion module of an auxiliary coherent millimeter wave radar through an optical fiber, the optical signal is converted into a microwave signal through the light → microwave conversion module and is input into a first auxiliary band-pass filter for filtering to obtain an auxiliary filtering signal, the auxiliary filtering signal is input into an auxiliary quadrupler for frequency multiplication to obtain an auxiliary frequency multiplication signal and is input into an auxiliary amplifier for signal amplification to obtain an auxiliary amplification signal, the auxiliary amplification signal is divided into two paths through an auxiliary power divider, one path is continuously amplified through an auxiliary power amplifier to obtain an auxiliary continuous amplification signal, the auxiliary continuous amplification signal is sent to an auxiliary transmitting antenna, and the auxiliary transmitting antenna radiates to a preset target area; the other path of the signal is provided for an auxiliary frequency mixer in an auxiliary receiving link to be used as an auxiliary frequency mixing local oscillator signal of 92-97 GHz;
after receiving the reflected or scattered electromagnetic wave signals, the auxiliary receiving antenna amplifies the reflected or scattered electromagnetic wave signals by the auxiliary low-noise amplifier and sends the amplified electromagnetic wave signals to the auxiliary mixer; the auxiliary frequency mixer mixes the echo signal with a 92-97GHz auxiliary frequency mixing local oscillator signal provided by the auxiliary transmitting link power divider to generate an auxiliary baseband signal; the auxiliary baseband signal is filtered by a second auxiliary band-pass filter and then sent to an auxiliary baseband amplifier for amplification, so that an auxiliary analog baseband signal is obtained; the auxiliary data acquisition module converts the auxiliary analog baseband signal into an auxiliary digital signal and divides the auxiliary digital signal into two paths, wherein one path is sent to the auxiliary data storage module for storage, and the other path is sent to the auxiliary imaging processing module; the auxiliary imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired auxiliary digital signals to obtain an auxiliary target image, and sends the auxiliary target image to the auxiliary data storage module; the auxiliary data storage module packs the auxiliary digital signal and the auxiliary target image to form auxiliary packed data, and sends the auxiliary packed data to the system controller.
The working process is basically the same as that of the main coherent millimeter wave radar, and the difference is that: the auxiliary coherent millimeter wave radar does not need to generate a signal of 23-24.25 GHz by itself, and the signal is provided by the main coherent millimeter wave radar through an optical fiber; the signal transmitting and receiving process is the same as that of the main coherent millimeter wave radar. In addition, the auxiliary coherent millimeter wave radar obtains a mixer local oscillator signal required by the deskew processing provided by the main coherent millimeter wave radar through the light → microwave conversion module. The main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are interconnected through optical fibers, and microwave signals are transmitted in a microwave → light → microwave signal transmission mode, so that the problems that the space transmission process is easily interfered and distortion is generated due to environmental change are solved.
The frequency synthesis reference signal and the reference signal required by the deskew processing between the two-station radar are interconnected through the optical fiber, and a signal transmission mode of microwave → light → microwave is adopted.
The system controller receives the packed data of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar, and performs synthetic aperture radar imaging processing to obtain a two-dimensional image of the airport runway;
comparing the two-dimensional image of the airport runway with the initial image of the airport runway, and judging whether the airport runway is deformed or not according to the comparison result;
specifically, if the two-dimensional image of the airport runway is the same as the initial image of the airport runway, the airport runway is not deformed;
if the two-dimensional image of the airport runway is not the same as the initial image of the airport runway, the airport runway is deformed.
As shown in FIG. 2, the invention provides a radar method for differential interference dual-station synchronous scanning high-resolution imaging, which comprises the following steps:
the beam axes of the double parabolic antennas point to the central position close to the landing area;
when the main coherent millimeter wave radar slides to a certain position of the main frame high track, the transmitting antenna radiates an electromagnetic wave signal to a first landing area, the electromagnetic wave signal enters a receiving antenna of the main coherent millimeter wave radar together with a backward reflection signal generated after the action of a preset target on the first landing area, meanwhile, the electromagnetic wave signal and a forward scattering signal generated after the action of the preset target on the first landing area enter an auxiliary receiving antenna of an auxiliary coherent millimeter wave radar sliding to a corresponding position, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the first landing area of the airport runway at the position of the main frame high track; in the process, the main coherent millimeter wave radar transmits and receives signals, and the auxiliary coherent millimeter wave radar only receives signals.
Then, the auxiliary coherent millimeter wave radar transmitting antenna radiates electromagnetic wave signals to a second landing area, backward reflection signals generated after the backward reflection signals and preset targets on the second landing area react enter a receiving antenna of the auxiliary coherent millimeter wave radar, meanwhile, forward scattering signals generated after the electromagnetic wave signals and the preset targets on the second landing area react enter a receiving antenna of a main coherent millimeter wave radar, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the second landing area of the airport runway at the elevated track position; in the process, the auxiliary coherent millimeter wave radar transmits and receives signals, and the main coherent millimeter wave radar only receives signals.
In the sliding process of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar on the corresponding elevated track, through the steps, echo signals of preset targets are obtained at different positions of the corresponding elevated track and are used as azimuth signals; carrying out synthetic aperture radar imaging processing on the distance direction signal and the azimuth direction signal obtained in the process, namely the two-dimensional data of the distance direction and the azimuth direction, so as to obtain a two-dimensional image of the runway of the airport;
comparing the two-dimensional image of the airport runway with the initial image of the airport runway, and judging whether the airport runway is deformed or not according to the comparison result;
specifically, if the two-dimensional image of the airport runway is the same as the initial image of the airport runway, the airport runway is not deformed;
if the two-dimensional image of the airport runway is not the same as the initial image of the airport runway, the airport runway is deformed.
Wherein the preset target is any position area on the airport runway.
Replacing the preset target with a position area containing foreign matters on the airport runway; based on the above method process, comparing the airport runway image containing the foreign object with the airport runway image without the foreign object, the distribution position of the foreign object and the size information thereof can be obtained.
The method of the invention uses a main coherent millimeter wave radar and an auxiliary coherent millimeter wave radar to form a double-station synchronous scanning high-resolution millimeter wave imaging radar system on a main elevated track and an auxiliary elevated track at two ends of an airport runway respectively; the two main coherent millimeter wave radars and the auxiliary coherent millimeter wave radar respectively utilize the large-bandwidth signals to realize high resolution in the length direction or the distance direction of the airport runway to obtain a distance direction image; realizing beam scanning on respective elevated tracks by utilizing translation to form a synthetic aperture so as to improve the resolution along the width direction or the azimuth direction of the airport runway and obtain an azimuth direction image; generating an airport runway two-dimensional image from the obtained airport runway distance direction image and the airport runway azimuth direction image; and comparing the two-dimensional image of the airport runway with the initial image of the airport runway, and judging whether the airport runway is deformed or not according to the comparison result.
Comprehensively utilizing forward scattering and backward reflecting signals of the radar to carry out high-resolution radar imaging on a preset target; identifying and detecting the target in the single-time double-station observation radar amplitude image to obtain a preliminary result; comparing the obtained preliminary result with the preset initial state of the target, and if the preliminary result is consistent with the preset initial state of the target, the airport runway is not deformed; if not, the airfield runway deforms;
the system can continuously scan on the track for multiple times, differential interference is formed among the multiple times of scanning, targets can be further identified and detected from phase images obtained by interference, and the system has the micro-deformation detection capability of the airport runway due to the observation mode.
Through one-time sliding scanning observation, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain high resolution in the length (distance direction) and width (azimuth direction) directions of the airport runway by using a large-bandwidth signal and a synthetic aperture, so that a high-resolution airport runway two-dimensional image is formed. And acquiring the microwave attribute result of the object on the airport runway and the airport runway through the differential interference information among the multiple sliding, and comparing the microwave attribute result with the initial state of the object on the airport runway and the airport runway, thereby judging the deformation of the airport runway. And then the radar cross section of single imaging detects and the difference interference between many times of formation of image detects airport runway deformation and the foreign matter of airport runway, has improved the detection rate to airport runway deformation and foreign matter or foreign matter on the airport runway greatly.
According to the information such as the shape, the size, the strength and the like of the target such as airport facilities, runway deformation, foreign objects and the like on the image, the target can be detected and identified as a judgment basis.
The observation means utilizes radar high-resolution imaging to acquire amplitude detail information of a backscattering center of a target so as to distinguish the target.
Through the complementary enhanced mode of work of two station synchronous scanning, the backscatter signal of its own radar and the forward scattering signal of another radar are received to every radar promptly to realize the synchronous observation to airport runway, airport foreign object or the forward scattering signal and the backscatter signal of foreign matter. The information of airfield runways, airfield foreign objects or foreign matters is integrated in two observation directions through the difference of forward scattering and backward reflection signals acquired by the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar, and the identification of targets is improved to perform high-resolution radar imaging. The observation means utilizes more target information obtained by different angles (forward scattering signals and backward reflecting signals) of radar observation to detect the target.
Through continuous multiple scanning imaging on the track, differential phase interference is formed between high-resolution radar images obtained through multiple scanning. The phase difference value of the airport fixing facility in the multi-scanning imaging is 0, and after a foreign object exists on an airport runway and the airport runway deforms, the phase of the obtained radar image is obviously different from the phase of the radar image when the foreign object does not exist and the radar image does not deform before. The difference in phase enables the phase change caused by foreign objects and deformation to be highlighted in the radar phase image through difference and accumulation processing, and the amplitude image is comprehensively researched and judged, so that the target can be further identified and detected.
The method comprehensively uses the high-resolution amplitude image of the single-station radar, the images of the front and the rear directions of the double-station radar and the differential interference phase image for multiple times to detect the deformation of the airport runway and foreign objects, thereby greatly improving the detection rate of the deformation of the airport runway and the foreign objects in the airport.
The system of the invention adopts the millimeter wave with the wave band of 92-97GHz, the wavelength is short, the target shape and size change are obviously reflected on the signal phase, and the deformation with the magnitude of hundred microns can be detected when the precision of phase detection reaches the magnitude of 10 degrees according to the corresponding relation between the wavelength and the phase, so that the system is favorable for obtaining the micro-deformation information of the airport runway caused by aging cracking, swelling, landing impact and the like of the runway material, and provides a basis for the health state and maintenance of the runway.
The system adopts a working mode of double-station synchronous scanning complementary enhancement, the distance from each radar to two landing areas on the runway of the airport is different, and the synchronous observation of forward scattering signals of foreign matters and backward scattering signals of the airport is realized by a double-station synchronous scanning observation mode, namely each radar receives the backward scattering signal of the radar and the forward scattering signal of the other radar, so that the synchronous observation of the forward scattering signals and the backward scattering signals of the foreign matters in the airport is realized, and the target detection rate is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A radar system for differential interference dual-station synchronous scanning high resolution imaging, the system comprising: the main coherent millimeter wave radar, the auxiliary coherent millimeter wave radar, the main frame elevated track and the auxiliary frame elevated track;
the main coherent millimeter wave radar is arranged on the main elevated track, and the auxiliary coherent millimeter wave radar is arranged on the auxiliary elevated track; the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar can respectively and correspondingly synchronously slide on the main frame elevated track and the auxiliary frame elevated track, and the main frame elevated track and the auxiliary frame elevated track are arranged at two ends or two sides of the airport runway in parallel; and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are respectively provided with a double parabolic antenna or a horn or a waveguide slot array for transmitting and receiving signals.
2. The system of claim 1, wherein two of the dual parabolic antennas are placed in an up and down orientation; the parabolic antenna positioned above is used as a signal transmitting antenna for transmitting signals; the lower parabolic antenna is used as a signal receiving antenna for receiving signals.
3. The system of claim 1, wherein the length of the main frame high track is greater than the width or length of the airport runway; the length of the auxiliary elevated track is greater than the width or length of the airport runway.
4. The system of claim 1, wherein the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar both use a millimeter wave window frequency band of 92-97GHz, and the signals are in the form of frequency modulated continuous waves, and have a signal bandwidth of 5GHz or more, and achieve an imaging resolution of 3 cm or less in the distance direction and the azimuth direction, respectively.
5. The system of claim 4, wherein the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar are in ping-pong transmission mode based on a two-station radar, the main coherent millimeter wave radar or the auxiliary coherent millimeter wave radar transmits signals, the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, and then the auxiliary coherent millimeter wave radar or the main coherent millimeter wave radar transmits signals, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar receive signals, forming a closed loop.
6. The system of claim 1, wherein the dominant coherent millimeter wave radar comprises:
the system comprises a transmitting antenna, a receiving antenna, a transmitting link, a receiving link, a direct digital synthesis signal generator, a continuous wave source, a high-stability crystal oscillator, a data acquisition module, a data storage module, an imaging processing module, a time schedule controller and a microwave → light conversion module;
the high-stability crystal oscillator is respectively connected with the direct digital synthesis signal generator, the continuous wave source, the data acquisition module, the time schedule controller and the microwave → light conversion module; the direct digital synthesis signal generator and the continuous wave source are respectively connected with a transmitting link, and the transmitting link is connected with a transmitting antenna; the data acquisition module is respectively connected with the data storage module, the imaging processing module and the receiving link; the imaging processing module is connected with the data storage module, and the receiving link is connected with the receiving antenna;
the transmitting link comprises a power amplifier, a power divider, an amplifier, a quadrupler, a first band-pass filter and a first mixer which are sequentially connected;
the receiving link comprises a low noise amplifier, a second mixer, a second band-pass filter and a baseband amplifier which are sequentially connected in sequence;
after the radar is started, a 100MHz reference oscillation frequency signal generated by a high-stability crystal oscillator is sent to a continuous wave source, and the continuous wave source generates a 22.8GHz first local oscillation signal required by a first frequency mixer; meanwhile, a 100MHz reference oscillation frequency signal is provided for a digital synthesis signal generator DDS, the digital synthesis signal generator DDS generates a baseband frequency modulation continuous wave signal of 0.2-1.45 GHz, and the baseband frequency modulation continuous wave signal is used as an input signal of a first frequency mixer; the first mixer modulates the baseband frequency modulation continuous wave signal to 23-24.25 GHz, outputs the continuous wave signal and sends the continuous wave signal to a post-stage band-pass filter; the band-pass filter filters stray and harmonic components in the continuous wave signal to obtain a filtered signal, and then the filtered signal is sent to the quadrupler; the four-frequency multiplier multiplies the frequency of the 23-24.25 GHz filtered signal to 92-97GHz frequency-multiplied signal, the frequency-multiplied signal is amplified by an amplifier to obtain an amplified signal, the amplified signal is divided into two paths by a power divider, one path of the amplified signal is continuously amplified by a power amplifier and is sent to a transmitting antenna, and the amplified signal is radiated to a preset target area in the form of electromagnetic waves through the transmitting antenna; the other path of the signal is provided for a second frequency mixer in a receiving link to be used as a frequency mixing local oscillator signal of 92-97 GHz;
electromagnetic wave signals radiated by the transmitting antenna are reflected or scattered after meeting a preset target; the backward scattering signals return to a receiving antenna on one side of the transmitting antenna, and the forward scattering signals enter a receiving antenna of the auxiliary coherent millimeter wave radar;
after receiving the reflected or scattered electromagnetic wave signal, the receiving antenna amplifies the electromagnetic wave signal by a low noise amplifier and sends the amplified electromagnetic wave signal to a second mixer; the second frequency mixer mixes the echo signal with a 92-97GHz mixing local oscillator signal provided by the transmitting link power divider to generate a baseband signal; the baseband signal is filtered by a second band-pass filter and then sent to a baseband amplifier for amplification, and an analog baseband signal is obtained; the data acquisition module converts the analog baseband signal into a digital signal and divides the digital signal into two paths, wherein one path is sent to the data storage module for storage, and the other path is sent to the imaging processing module; the imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired digital signals to obtain a target image, and sends the target image to the data storage module; the data storage module packages the digital signal and the target image to form packaged data and sends the packaged data to the system controller.
7. The system of claim 1, wherein the assisted coherent millimeter wave radar comprises:
the system comprises an auxiliary transmitting antenna, an auxiliary receiving antenna, an auxiliary transmitting link, an auxiliary receiving link, an auxiliary data acquisition module, an auxiliary data storage module, an auxiliary imaging processing module and an auxiliary time schedule controller;
the auxiliary transmitting antenna is connected with the auxiliary transmitting link, the auxiliary transmitting link is connected with the auxiliary time schedule controller, the auxiliary time schedule controller is connected with the auxiliary data acquisition module, the auxiliary data acquisition module is respectively connected with the auxiliary data storage module, the auxiliary imaging processing module and the auxiliary receiving link, the auxiliary data storage module is connected with the auxiliary imaging processing module, and the auxiliary receiving link is connected with the auxiliary receiving antenna;
the auxiliary transmitting link comprises an auxiliary power amplifier, an auxiliary power divider, an auxiliary amplifier, an auxiliary quadrupler, a first auxiliary band-pass filter and an optical → microwave conversion module which are sequentially connected;
the auxiliary receiving link comprises an auxiliary low noise amplifier, an auxiliary mixer, a second auxiliary band-pass filter and a baseband amplifier which are sequentially connected;
the method comprises the steps that a main coherent millimeter wave radar converts a signal of 23-24.25 GHz into an optical signal through a microwave → optical conversion module and sends the optical signal to a light → microwave conversion module of an auxiliary coherent millimeter wave radar through an optical fiber, the optical signal is converted into a microwave signal through the light → microwave conversion module and is input into a first auxiliary band-pass filter for filtering to obtain an auxiliary filtering signal, the auxiliary filtering signal is input into an auxiliary quadrupler for frequency multiplication to obtain an auxiliary frequency multiplication signal and is input into an auxiliary amplifier for signal amplification to obtain an auxiliary amplification signal, the auxiliary amplification signal is divided into two paths through an auxiliary power divider, one path is continuously amplified through an auxiliary power amplifier to obtain an auxiliary continuous amplification signal, the auxiliary continuous amplification signal is sent to an auxiliary transmitting antenna, and the auxiliary transmitting antenna radiates to a preset target area; the other path of the signal is provided for an auxiliary frequency mixer in an auxiliary receiving link to be used as an auxiliary frequency mixing local oscillator signal of 92-97 GHz;
after receiving the reflected or scattered electromagnetic wave signals, the auxiliary receiving antenna amplifies the reflected or scattered electromagnetic wave signals by the auxiliary low-noise amplifier and sends the amplified electromagnetic wave signals to the auxiliary mixer; the auxiliary frequency mixer mixes the echo signal with a 92-97GHz auxiliary frequency mixing local oscillator signal provided by the auxiliary transmitting link power divider to generate an auxiliary baseband signal; the auxiliary baseband signal is filtered by a second auxiliary band-pass filter and then sent to an auxiliary baseband amplifier for amplification, so that an auxiliary analog baseband signal is obtained; the auxiliary data acquisition module converts the auxiliary analog baseband signal into an auxiliary digital signal and divides the auxiliary digital signal into two paths, wherein one path is sent to the auxiliary data storage module for storage, and the other path is sent to the auxiliary imaging processing module; the auxiliary imaging processing module performs amplitude-phase preprocessing, Fourier transform and azimuth compression on the acquired auxiliary digital signals to obtain an auxiliary target image, and sends the auxiliary target image to the auxiliary data storage module; the auxiliary data storage module packs the auxiliary digital signal and the auxiliary target image to form auxiliary packed data, and sends the auxiliary packed data to the system controller.
8. A method for radar system based on differential interference two-station synchronous scanning high resolution imaging, characterized in that the method is realized by the system of any one of the above claims 1-7, which comprises:
the beam axes of the double parabolic antennas point to the central position close to the landing area;
when the main coherent millimeter wave radar slides to a certain position of the main frame high track, the transmitting antenna radiates an electromagnetic wave signal to a first landing area, the electromagnetic wave signal enters a receiving antenna of the main coherent millimeter wave radar together with a backward reflection signal generated after the action of a preset target on the first landing area, meanwhile, the electromagnetic wave signal and a forward scattering signal generated after the action of the preset target on the first landing area enter an auxiliary receiving antenna of an auxiliary coherent millimeter wave radar sliding to a corresponding position, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the first landing area of the airport runway at the position of the main frame high track;
then, the auxiliary coherent millimeter wave radar transmitting antenna radiates electromagnetic wave signals to a second landing area, backward reflection signals generated after the backward reflection signals and preset targets on the second landing area react enter a receiving antenna of the auxiliary coherent millimeter wave radar, meanwhile, forward scattering signals generated after the electromagnetic wave signals and the preset targets on the second landing area react enter a receiving antenna of a main coherent millimeter wave radar, and the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar respectively obtain corresponding distance direction signals of the second landing area of the airport runway at the elevated track position;
in the sliding process of the main coherent millimeter wave radar and the auxiliary coherent millimeter wave radar on the corresponding elevated track, through the steps, echo signals of preset targets are obtained at different positions of the corresponding elevated track and are used as azimuth signals; carrying out synthetic aperture radar imaging processing on the distance direction signal and the azimuth direction signal obtained in the process, namely the two-dimensional data of the distance direction and the azimuth direction, so as to obtain a two-dimensional image of the runway of the airport;
comparing the two-dimensional image of the airport runway with the initial image of the airport runway, and judging whether the airport runway is deformed or not according to the comparison result;
specifically, if the two-dimensional image of the airport runway is the same as the initial image of the airport runway, the airport runway is not deformed;
if the two-dimensional image of the airport runway is not the same as the initial image of the airport runway, the airport runway is deformed.
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