CN109085539B - Double-reflector radar imaging antenna - Google Patents
Double-reflector radar imaging antenna Download PDFInfo
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- CN109085539B CN109085539B CN201810911276.3A CN201810911276A CN109085539B CN 109085539 B CN109085539 B CN 109085539B CN 201810911276 A CN201810911276 A CN 201810911276A CN 109085539 B CN109085539 B CN 109085539B
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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
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
- G01S7/026—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects involving the transmission of elliptically or circularly polarised waves
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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
- 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
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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
- 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
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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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
- 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
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
- G01S2013/916—Airport surface monitoring [ASDE]
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The embodiment of the invention provides a double-reflector radar imaging antenna, and relates to the field of radar detection. The double-reflector radar imaging antenna comprises a servo turntable, a transmitting-receiving front end, a supporting device, a first reflector, a second reflector, a transmitting feed source assembly and a receiving feed source assembly, wherein the first reflector, the second reflector, the transmitting feed source assembly and the receiving feed source assembly are arranged on the supporting device; the supporting device is rotatably connected with the servo rotary table, the first reflecting surface and the transmitting feed source component form a transmitting antenna, the second reflecting surface and the receiving feed source component form a receiving antenna, and the transmitting feed source component and the receiving feed source component are respectively connected with the transmitting and receiving front ends. The dual-reflector radar imaging antenna can realize high frequency band and high resolution, thereby realizing the detection of small fragment targets and being used in an airport runway foreign matter detection system.
Description
Technical Field
The invention relates to the field of radar detection, in particular to a double-reflector radar imaging antenna.
Background
Airport runway intrusion Foreign Objects (FOD) pose a significant threat to flight safety. Aircraft are quite fragile for FOD, a bird or a small piece of plastic cloth sucked into an engine may cause idle stop, a small screw or metal sheet or even sharp stones may prick a tire to cause explosion, and the generated tire fragments may damage the aircraft body or important parts such as hydraulic pipes and oil tanks. Since the year 2000, after the france air crash accident, many research institutes and companies have been dedicated to research and development of systems for applying the FOD detection technology to prevent the tire damage or the engine damage of the airplane caused by the foreign objects on the runway, and the additional economic loss such as the closing of the runway or the late flight caused by the damage. The performance of the FOD detection system plays an important role in guaranteeing flight take-off and landing safety.
The radar detection method is one of means for detecting foreign matters in airports, but the existing domestic radar detection methods all have the defect of low resolution, so that a lot of false alarms can be caused in the detection process, and unnecessary cost waste is generated.
Disclosure of Invention
The invention aims to provide a double-reflector radar imaging antenna which can realize high resolution, can realize the detection of small fragment targets and can be used in an airport runway foreign matter detection system.
The embodiment of the invention is realized by the following steps:
a dual-reflector radar imaging antenna comprises a servo turntable, a transmitting-receiving front end, a supporting device, a first reflector, a second reflector, a transmitting feed source assembly and a receiving feed source assembly, wherein the first reflector, the second reflector, the transmitting feed source assembly and the receiving feed source assembly are arranged on the supporting device; the supporting device is rotatably connected with the servo rotary table, the first reflecting surface and the transmitting feed source component form a transmitting antenna, the second reflecting surface and the receiving feed source component form a receiving antenna, and the transmitting feed source component and the receiving feed source component are respectively connected with the transmitting and receiving front ends.
The double-reflector radar imaging antenna provided by the embodiment of the invention has the beneficial effects that: the supporting device is rotated relative to the servo turntable, the first reflecting surface, the second reflecting surface, the transmitting feed source assembly and the receiving feed source assembly which are arranged on the supporting device are driven to rotate, the first reflecting surface and the transmitting feed source assembly form a transmitting antenna for azimuth scanning, the second reflecting surface and the receiving feed source assembly receiving antenna are used for receiving scanned foreign matter information, the transmitting feed source assembly and the receiving feed source assembly are respectively connected with the transmitting and receiving front end, and the foreign matter information received by the receiving feed source assembly is transmitted through the transmitting and receiving front end so as to process the detection information. The dual-reflector radar imaging antenna provided by the embodiment of the invention is a transmitting and receiving common radar antenna, can realize high resolution, can realize the detection of small fragment targets, has the characteristics of light weight and simple structure, is convenient to use, and can be used in an airport runway foreign matter detection system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a perspective view of a dual reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of another view of a dual reflector radar imaging antenna provided by an embodiment of the present invention.
Fig. 3 is a perspective view of a first reflection surface of a dual reflection surface radar imaging antenna according to an embodiment of the present invention.
Fig. 4 is a perspective view of the back surface of the first reflection surface of the dual reflection surface radar imaging antenna according to the embodiment of the present invention.
Fig. 5 is a perspective view of a transmission feed component of a dual-reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 6 is a perspective view of a transmitting feed of a dual reflector radar imaging antenna provided by an embodiment of the present invention.
Fig. 7 is a perspective view of a transmitting curved waveguide of a dual-reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 8 is a standing wave ratio graph of a transmitting feed of the dual-reflector radar imaging antenna provided by the embodiment of the invention.
Fig. 9 is a directional diagram of a transmitting feed of a dual reflector radar imaging antenna provided by an embodiment of the invention.
Fig. 10 is an axial ratio directional diagram (wide beam section) of a transmitting feed of the dual reflector radar imaging antenna provided by the embodiment of the invention.
Fig. 11 is a radiation pattern of a transmitting feed horn of a dual reflector radar imaging antenna provided by an embodiment of the present invention.
Fig. 12 is a perspective view of a receive feed assembly of a dual reflector radar imaging antenna provided by an embodiment of the present invention.
Fig. 13 is a perspective view of a receiving feed of a dual reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 14 is a perspective view of a receiving curved waveguide of a dual reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 15 is a receiving feed standing wave ratio curve diagram of the dual-reflector radar imaging antenna provided by the embodiment of the invention.
Fig. 16 is a receiving feed direction diagram of a dual reflector radar imaging antenna provided by an embodiment of the present invention.
Fig. 17 is a receiving feed axial ratio directional diagram of the dual-reflector radar imaging antenna provided by the embodiment of the invention.
Fig. 18 is a perspective view of a feed adjustment device of a dual-reflector radar imaging antenna according to an embodiment of the present invention, in which adjustment of a transmission feed assembly is taken as an example.
Fig. 19 is a perspective view of a support frame and a digital box assembly of a dual reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 20 is a sectional structural view of a servo turntable of a dual-reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 21 is a block diagram schematically illustrating a structure of a servo control system of a servo turntable of a dual-reflector radar imaging antenna according to an embodiment of the present invention.
Fig. 22 is a perspective view of a radio frequency chassis of a dual-reflector radar imaging antenna according to an embodiment of the present invention.
Icon: 1-a dual reflector radar imaging antenna; 100-a first reflective surface; 110-a second reflective surface; 111-cross ribs; 112-positioning pin holes; 113-a mounting plane; 114-a reference hole; 115-a reference plane; 200-a transmit feed assembly; 210-a transmission feed source; 211-transmitting feed horn; 2111-a first mounting flange; 212-transmit feed spacer circular polarizer; 213-transmitting feed power divider; 2131-a second mounting flange; 220-launch curved waveguides; 221-a third mounting flange; 222-a fourth mounting flange; 300-receive a feed source component; 310-receive a feed; 311-receiving a feed horn; 3111-a fifth mounting flange; 312-receive feed spacer circular polarizer; 313-a first receive feed quarter bend waveguide; 314-second receive feed quarter bend waveguide; 315-first receive feed power divider; 316-second receive feed power divider; 3151-sixth mounting flange; 320-receive curved waveguide; 321-a seventh mounting flange; 322-eighth mounting flange; 400-a servo turntable; 410-a carrier chassis; 420-azimuth axis of rotation; 430-a bearing; 440-a bearing plate; 450-torque motor; 460-a rotary encoder; 470-a brake assembly; 471-brake; 472-brake support; 480-a motor bracket; 490-slip ring assembly; 491-a slip ring; 4911-slip ring stator; 4912-slip ring rotor; 492-slip ring rotor support; 493-slip ring stator support; 500-a transceiver front end; 600-a support device; 610-a support frame; 611-a reflecting surface support frame; 612-a support plate; 613-support frame closing plate; 614-radio frequency case side bracket; 620-digital chassis; 621-digital cabinet left support; 622-digital chassis right support; 623-digital case back panel; 624-digital chassis column; 625-digital chassis cover plate; 626-digital case front panel; 630-a radio frequency chassis; 631-a radio frequency cabinet; 6311-joint mounting hole; 6312-side seam allowance; 632-a radio frequency cover plate; 700-a feed source mounting bracket; 710-a first feed mounting bracket; 720-a second feed source mounting bracket; 800-feed source adjusting device; 810-a movable plate; 820-a fixed frame; 830-a first adjustment member; 840-a second adjustment member; 850-a third adjustment member; 900-servo control system; 910-a power supply system; 911-EMI filter; 912-air switch; 913-an ac contactor; 914-AC/DC power supply module; 920-a servo controller; 930-control device.
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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Referring to fig. 1 and fig. 2, the present embodiment provides a dual reflector radar imaging antenna 1, which can be used as a radar antenna for detecting and detecting a foreign object on an airport runway, and has the characteristics of high frequency band and high resolution, and the operating frequency band can be a W frequency band. The method can detect the foreign matters with potential safety hazards on the airport runway from the millimeter level, and plays an important role in guaranteeing the taking-off and landing safety of flights.
The dual-reflector radar imaging antenna 1 provided by this embodiment includes a servo turntable 400, a transceiver front end 500, a supporting device 600, a first reflector 100, a second reflector 110, a transmitting feed source assembly 200, and a receiving feed source assembly 300. The first reflecting surface 100, the second reflecting surface 110, the transmission feed assembly 200 and the reception feed assembly 300 are all disposed on the supporting device 600. The supporting device 600 is rotatably connected with the servo turntable 400, the first reflecting surface 100 and the transmitting feed source assembly 200 form a transmitting antenna, the second reflecting surface 110 and the receiving feed source assembly 300 form a receiving antenna, and the transmitting feed source assembly 200 and the receiving feed source assembly 300 are respectively connected with the transmitting and receiving front end 500. The transmitting antenna is used for carrying out azimuth scanning, and the receiving antenna is used for receiving the scanned foreign matter information. Optionally, in this embodiment, the transceiver front end 500 employs the millimeter wave transceiver front end 500, and further can detect the foreign object from a millimeter level. In addition, the transmitting antenna is right-hand circularly polarized, and the receiving antenna is double circularly polarized.
In this embodiment, the supporting device 600 includes a supporting frame 610, a digital chassis 620 and a radio frequency chassis 630, and the digital chassis 620 and the radio frequency chassis 630 are disposed on the supporting frame 610. Wherein, a digital unit is arranged in the digital case 620, the transceiving front end 500 is connected with the digital unit through a cable, and the supporting frame 610 is rotatably connected with the servo turntable 400. The digital unit is connected with an external signal processing device through the servo turret 400 to transmit signals to the signal processing device for back-end processing.
In this embodiment, the transceiver front end 500 is disposed in the rf chassis 630. In addition, the rf chassis 630 is also used to mount rf devices such as a video amplifier, the transceiver front end 500 is connected to the video amplifier, the video amplifier is connected to the digital unit, and the video amplifier can amplify the signal received by the transceiver front end 500 and transmit the amplified signal to the digital unit.
Referring to fig. 3 and 4, in the present embodiment, the first reflective surface 100 and the second reflective surface 110 are both cut strip-shaped offset paraboloids, and the working surfaces thereof have high surface smoothness and high profile accuracy. The first reflecting surface 100 and the second reflecting surface 110 are respectively located above and below the rf chassis 630, and are arranged symmetrically up and down. The focus of the first reflecting surface 100 coincides with the phase center of the transmission feed source assembly 200, thereby forming a transmission antenna; the focal point of the second reflecting surface 110 coincides with the phase center of the reception feed assembly 300, thereby constituting a reception antenna. Optionally, the back surfaces of the first reflecting surface 100 and the second reflecting surface 110 are both provided with crossed reinforcing ribs 111, so that the structural strength is ensured; the first reflecting surface 100 and the second reflecting surface 110 are installed with a positioning pin hole 112 and an installation plane 113, positioning is realized through the positioning pin hole 112 and the support frame 610, and the installation plane 113 is connected with the support frame 610 through a connecting piece, so that the installation accuracy of the first reflecting surface 100 and the second reflecting surface 110 is guaranteed. The top surfaces of the first and second reflection surfaces 100 and 110 are each provided with a reference hole 114 and a reference plane 115.
Referring to fig. 5, further, the dual reflector radar imaging antenna 1 may further include a feed mounting bracket 700, where the feed mounting bracket 700 includes a first feed mounting bracket 710. The transmit feed assembly 200 is mounted to the rf chassis 630 by a first feed mounting bracket 710. Of course, the transmission feed assembly 200 may be mounted to other structures of the support device 600 via the first feed mounting bracket 710. The top position in the middle of the tail of the radio frequency case 630 is provided with a rectangular groove for installing the transmission feed source assembly 200.
The transmission feed source assembly 200 comprises a transmission feed source 210 and a transmission curved waveguide 220, wherein the transmission feed source 210 is installed on a first feed source installation bracket 710, one end of the transmission curved waveguide 220 is connected with the transmission feed source 210, and the other end is connected with the transceiving front end 500.
Referring to fig. 6, in the present embodiment, the transmission feed source 210 includes a transmission feed source horn 211, a transmission feed source partition circular polarizer 212, and a transmission feed source power divider 213, which are connected in sequence. Wherein, the transmitting feed power divider 213 is connected with the transmitting curved waveguide 220. The transmitting feed horn 211 is provided with a first mounting flange 2111, and the transmitting feed horn 211 is connected with the first feed mounting bracket 710 through the first mounting flange 2111. The first mounting flange 2111 may optionally be positioned with the first feed mounting bracket 710 via pin holes and fastened with screws.
The transmitting feed source horn 211 adopts a square caliber as a radiation unit, and the mouth surface of the radiation unit is fully utilized. Moreover, a horn form with a single layer and eight ports is adopted to realize a one-dimensional array (8 multiplied by 1). One path of the transmitting feed source partition plate circular polarizer 212 adopts a short circuit design, so that the complexity is reduced, and the single circular polarization is realized. In this embodiment, the transmit feed spacer circular polarizer 212 employs right circular polarization. The transmitting feed source power divider 213 adopts a folding H-plane Y-section power divider, and has good index and compact structure. The common port of the transmitting feed source power divider 213 is a BJ900 standard waveguide port, and a second mounting flange 2131 is arranged at one end of the common port. The transmitting feed power divider 213 is connected with the transmitting curved waveguide 220 through a second mounting flange 2131. Optionally, the second mounting flange 2131 is a non-standard flange, and a pin hole for positioning is also designed in the non-standard flange, so that the mounting accuracy is ensured.
Therefore, the transmission feed source 210 adopts a form of a horn, a diaphragm circular polarizer and a power division network, and the single-layer one-to-eight power division network feeds eight circular polarized horn units to realize a one-dimensional array (8 × 1).
Referring to fig. 7, the inner cavity of the launch curved waveguide 220 is a BJ900 waveguide cavity, and has a spatial curved waveguide structure, wherein a third mounting flange 221 is disposed at one end, and a fourth mounting flange 222 is disposed at the other end. The third mounting flange 221 is connected with the second mounting flange 2131 so as to realize the connection between the transmitting curved waveguide 220 and the transmitting feed power divider 213, and the third mounting flange 221 can be a non-standard flange. The fourth mounting flange 222 is configured to be connected to the transceiver front end 500, and the fourth mounting flange 222 may be a standard FUGP type flange.
Fig. 8 is a standing wave ratio graph of the transmission feed 210 of the dual-reflector radar imaging antenna 1 according to the embodiment of the present invention. Fig. 9 is a directional diagram of the transmitting feed 210 of the dual-reflector radar imaging antenna 1 according to the embodiment of the present invention. Fig. 10 is an axial ratio directional diagram (wide beam section) of the transmission feed 210 of the dual reflector radar imaging antenna 1 according to the embodiment of the present invention. Fig. 11 is a radiation pattern of the transmitting feed horn 211 of the dual reflector radar imaging antenna 1 according to the embodiment of the present invention. As can be seen from fig. 8 to 10, the dual-reflector radar imaging antenna 1 provided by the embodiment of the present invention has good radiation performance.
Referring to fig. 12, the feed source mounting bracket 700 may further include a second feed source mounting bracket 720, the second feed source mounting bracket 720 is connected to the radio frequency chassis 630, and the receiving feed source assembly 300 is mounted on the second feed source mounting bracket 720. Of course, the receiving feed assembly 300 may be mounted to other structures of the support apparatus 600 via the first feed mounting bracket 710. The bottom of the middle of the tail of the rf chassis 630 is provided with a rectangular slot for mounting the receiving feed source assembly 300.
The receiving feed source assembly 300 comprises a receiving feed source 310 and a receiving bent waveguide 320, wherein the receiving feed source 310 is installed on a second feed source installation support 720, one end of the receiving bent waveguide 320 is connected with the receiving feed source 310, and the other end is connected with the transceiving front end 500.
Referring to fig. 13, the receiving feed 310 includes a receiving feed horn 311, a receiving feed diaphragm circular polarizer 312, a first receiving feed quarter-turn waveguide 313, a second receiving feed quarter-turn waveguide 314, a first receiving feed power divider 315, and a second receiving feed power divider 316. One end of the receiving feed diaphragm circular polarizer 312 is connected to the receiving feed horn 311, and the other two ends are respectively connected to the first receiving feed right-angled bent waveguide 313 and the second receiving feed right-angled bent waveguide 314. The other end of the first receiving feed right-angle bent waveguide 313 is connected with a first receiving feed power divider 315, and the other end of the second receiving feed right-angle bent waveguide 314 is connected with a second receiving feed power divider 316. The number of the receiving curved waveguides 320 is two, the first receiving feed power divider 315 and the second receiving feed power divider 316 are respectively connected to one end of one receiving curved waveguide 320, and the other ends of the two receiving curved waveguides 320 are connected to the transceiving front end 500.
The receiving feed source horn 311 adopts a square aperture as a radiation unit, and makes full use of the aperture surface of the radiation unit. Moreover, a horn form with a single layer and eight ports is adopted to realize a one-dimensional array (8 multiplied by 1). A fifth mounting flange 3111 is arranged on the receiving feed source horn 311, and is connected with the second feed source mounting bracket 720 through the fifth mounting flange 3111. A fifth mounting flange 3111 may optionally be positioned with the second feed mounting bracket 720 via pin holes and fastened via screws.
Dual circular polarization is achieved by the receive feed spacer circular polarizer 312. The first receiving feed power divider 315 and the second receiving feed power divider 316 both adopt power dividers in the form of H-plane T-shaped sections, and have good indexes and compact structures. The common port of the first receiving feed power divider 315 and the second receiving feed power divider 316 is a BJ900 standard waveguide port. Sixth mounting flanges 3151 are respectively arranged at one end of the first receiving feed power divider 315 and one end of the second receiving feed power divider 316, and the first receiving feed power divider 315 and the second receiving feed power divider 316 are respectively connected with one receiving curved waveguide 320 through the sixth mounting flanges 3151. Optionally, the sixth mounting flange 3151 is a non-standard flange, and a pin hole for positioning is also designed on the sixth mounting flange 3151, so as to ensure mounting accuracy.
Therefore, the receiving feed source 310 adopts the form of a horn, a diaphragm circular polarizer and a power dividing network, and the eight circular polarized horn units are fed by the double-layer one-to-eight power dividing network, so that a one-dimensional array (8 × 1) is realized.
Referring to fig. 14, the two receiving waveguides 320 have the same structure and both adopt a bent structure, and the inner cavity of the receiving waveguide 320 is a BJ900 waveguide cavity in the form of an H-plane double-curved waveguide. One end of the receiving curved waveguide 320 is provided with a seventh mounting flange 321, and the other end is provided with an eighth mounting flange 322. The seventh mounting flanges 321 of the two receiving curved waveguides 320 are respectively connected with the sixth mounting flange 3151 on the first receiving feed power divider 315 and the sixth mounting flange 3151 of the second receiving feed power divider 316. The seventh mounting flange 321 may be a non-standard flange. The eighth mounting flange 322 is used for connecting with the transceiver front end 500, and the eighth mounting flange 322 may be a standard FUGP type flange.
Fig. 15 is a standing-wave ratio graph of the receiving feed 310 of the dual-reflector radar imaging antenna 1 according to the embodiment of the present invention. Fig. 16 is a receiving feed 310 directional diagram of the dual reflector radar imaging antenna 1 according to the embodiment of the present invention. Fig. 17 is an axial ratio directional diagram of the receiving feed 310 of the dual-reflector radar imaging antenna 1 according to the embodiment of the present invention. As can be seen from fig. 15 to 17, the dual-reflector radar imaging antenna 1 provided by the embodiment of the present invention has good radiation performance.
Referring to fig. 18, further, the dual reflector radar imaging antenna 1 may further include a feed adjusting device 800, where the feed adjusting device 800 includes a movable plate 810, a fixed frame 820, a first adjusting member 830, a second adjusting member 840, and a third adjusting member 850. The feed source mounting bracket 700 is connected with the movable plate 810, the fixed frame 820 is connected with the supporting device 600, the side surface of the movable plate 810 in the first direction is connected with the fixed frame 820 through the first adjusting part 830 to adjust the position of the movable plate 810 in the first direction relative to the fixed frame 820, the side surface of the movable plate 810 in the second direction is connected with the fixed frame 820 through the second adjusting part 840 to adjust the position of the movable plate 810 in the second direction relative to the fixed frame 820, and the side surface of the movable plate 810 in the third direction is connected with the fixed frame 820 through the third adjusting part 850 to adjust the position of the movable plate 810 in the third direction relative to the fixed frame 820.
It should be noted that the feed source mounting bracket 700 may be a first feed source mounting bracket 710, or may also be a second feed source mounting bracket 720, or both the first feed source mounting bracket 710 and the second feed source mounting bracket 720 may be connected to the supporting device 600 through the feed source adjusting device 800, so as to adjust the positions of the transmitting feed source component 200 and the receiving feed source component 300 as required, and achieve the feed source adjusting function with three degrees of freedom, i.e., front-back, left-right, and pitching. In addition, the first direction, the second direction and the third direction are mutually orthogonal pairwise. Wherein the first direction is represented by the X-direction, the second direction is represented by the Y-direction, and the third direction is represented by the pitch direction. Alternatively, the first, second and third adjusting members 830, 840 and 850 may be X-direction adjusting screws, Y-direction adjusting screws and pitch adjusting screws, respectively. The first adjusting members 830 may be provided in multiple groups, each group of the first adjusting members 830 includes two X-direction adjusting screws respectively disposed on two opposite side surfaces of the movable plate 810 in the first direction; the second adjusting members 840 may be a plurality of groups, and each group of the second adjusting members 840 includes two Y-direction adjusting screws respectively disposed on two opposite sides of the movable plate 810 in the second direction.
Referring to fig. 19, the supporting frame 610 may further include a reflective surface supporting frame 611, a supporting plate 612, a supporting frame sealing plate 613 and an rf chassis side bracket 614. The number of the reflecting surface supports 611 may be two, and the two reflecting surface supports 611 are arranged in parallel. One side of the supporting plate 612 is connected to one side of the reflecting surface supporting frame 611 to form a main supporting structure of the antenna, and optionally, the supporting plate and the main supporting structure are connected by screws to form an L-shaped structure. The support frame closing plate 613 is connected between the two reflective surface support frames 611. The bottom of the support plate 612 is fitted to the servo turntable 400 and is coupled thereto by screws. The rf chassis side supports 614 are mounted on two sides of the reflecting surface support 611 by screws, and are connected to the rf chassis 630 for supporting the rf chassis 630.
The digital chassis 620 may be considered integrated with the support frame 610. The digital case 620 may include a left digital case support 621, a right digital case support 622, a rear digital case panel 623, a stand column 624, a cover plate 625 and a front digital case panel 626, wherein the front digital case panel 626, the left digital case support 621, the rear digital case panel 623 and the right digital case support 622 are sequentially connected end to end and enclose a rectangular frame structure, and the cover plate 625 is covered on the rectangular frame structure and is connected with the front digital case panel 626, the left digital case support 621, the rear digital case panel 623 and the right digital case support 622 all around. In addition, the digital case right support 622 and the digital case rear panel 623 and the digital case left support 621 and the digital case rear panel 623 are respectively connected through a digital case upright 624. Thus, the digital chassis 620 of a rectangular body structure is formed.
Referring to fig. 20, the servo turntable 400 is used as a driving component for radar scanning detection, and adopts a direct-drive mode. Under the drive of the servo turntable 400, the actions of continuous rotation, reciprocating scanning, accurate pointing and the like are realized. The servo turntable 400 comprises a bearing case 410, and an orientation rotating shaft 420, a bearing 430, a force bearing plate 440, a torque motor 450, a rotary encoder 460, a brake assembly 470, a motor bracket 480 and a slip ring assembly 490 which are arranged in the bearing case 410. The carrier case 410 is made of sheet metal and is a carrier of the whole set of antennas. The bottom of the chassis 410 is mounted with casters and legs, which are directly placed on the horizontal ground or fixed by anchor bolts. The motor bracket 480 is connected with the bearing case 410, the torque motor 450 is installed on the motor bracket 480, the torque motor 450 is connected with the azimuth rotating shaft 420, the azimuth rotating shaft 420 is connected with the supporting frame 610, and the rotary encoder 460 is arranged on the azimuth rotating shaft 420 and used for measuring the rotation angle information of the azimuth rotating shaft 420 during movement in real time. The bearing 430 adopts a high-precision slewing bearing 430, the inner ring of the bearing 430 is in transition fit with the azimuth rotating shaft 420, better coaxiality is ensured, and the outer ring is in small-gap fit with the bearing plate 440. The bearing plate 440 is mounted on the upper surface of the carrier case 410 by screws. In this embodiment, the azimuth spindle 420 has a stepped structure, and the rotary encoder 460, the torque motor 450, and the brake assembly 470 are sequentially installed from top to bottom, and the number inside the azimuth spindle 420 has a hollow through hole for a wire harness to pass through. The digital unit is connected to the signal processing equipment at the back end via the slip ring assembly 490. The top of the servo turntable 400 is closely matched with the spigot at the bottom of the support 610 by the azimuth rotary shaft 420 and is connected by a screw.
The brake assembly 470 includes a brake 471 and a brake holder 472, wherein the brake 471 is disposed on the orientation rotating shaft 420 and below the torque motor 450, and is used for limiting the rotation of the orientation rotating shaft 420 when the power failure phenomenon occurs due to an abnormal condition. The stopper 471 is installed at the stopper bracket 472, and the stopper bracket 472 is connected with the motor bracket 480.
Referring to fig. 21, the servo turntable 400 is provided with a servo control system 900, and the servo control system 900 is disposed in the carrying case 410. The servo control system 900 includes a power supply system 910, a servo controller 920, and a control device 930. The power supply system 910 is electrically connected to the servo controller 920, the servo controller 920 is electrically connected to the control device 930, and the servo controller 920 is electrically connected to the digital unit and configured to control the control device 930 to complete corresponding actions according to instructions sent by the digital unit. The power supply system 910 includes an EMI filter 911, an air switch 912, an AC contactor 913, and an AC/DC power module 914, which are connected in sequence. The AC/DC power module 914 is electrically connected to the servo controller 920. Optionally, the servo control system 900 adopts an ARM + FPGA core architecture, and its working principle is: the primary power enters an AC/DC power module 914 through an EMI filter, an air switch 912 and an AC contactor 913, and outputs 24VDC power to a servo controller 920; a digital unit sends a power on-off instruction (OC) to a servo system, and the servo system realizes on-off control of a 24VDC main power supply to a board-level DC/DC power supply module through a hardware circuit; after the power-on is completed, the servo controller 920 completes system initialization and enters an instruction interrupt waiting state, and completes task scheduling management, data uploading, state feedback and motion control according to various instructions sent by the digital unit; the servo system periodically performs system self-check (if abnormal, fault tolerance and fault handling are performed), and simultaneously records logs according to the working state of the system.
Referring to fig. 22, further, the rf chassis 630 is a rectangular structure and is composed of an rf box 631 and an rf cover 632. Radiating holes are designed on the side of the radio frequency box 631 and the radio frequency cover plate 632 for radiating heat; a connector mounting hole 6311 is designed on the front end face of the connector for mounting a radio frequency connector and an aviation connector; the front end side surface is provided with a side surface seam allowance 6312 for connecting with the rf chassis side bracket 614 through screws.
In summary, the dual-reflector radar imaging antenna 1 provided in this embodiment may be fixed on the ground, and belongs to an eccentric turntable structure; the working frequency band can be W frequency band, and is a common radar antenna for receiving and transmitting. By the design of the high-frequency-band antenna, high resolution can be realized, and therefore the small fragment target can be detected. The dual-reflector radar imaging antenna 1 drives the azimuth rotating shaft 420 through the torque motor 450, so as to drive the supporting device 600 and the transmitting antenna thereon to perform azimuth scanning. According to different control instructions, the actions of continuous rotation, reciprocating scanning, accurate pointing and the like can be realized, so that the detection and positioning functions of the radar are realized. Foreign matter information detected by the antenna is processed by a radio frequency device in the radio frequency case 630 and then transmitted to a digital processing system at the rear end, so that the detection information is processed. The rotary encoder 460 on the azimuth rotating shaft 420 can measure the rotation angle information in real time during movement and transmit the rotation angle information back to the servo system in real time, so as to realize accurate positioning and speed measurement. If the power failure occurs due to an abnormal condition, the brake 471 acts to limit the rotation of the azimuth spindle 420. The dual-reflector radar imaging antenna 1 has the advantages of being high in frequency band, high in molded surface precision, light in weight, simple in structure and convenient to use.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A radar imaging antenna with double reflecting surfaces is characterized by comprising a servo turntable, a transmitting and receiving front end, a supporting device, a first reflecting surface, a second reflecting surface, a transmitting feed source assembly and a receiving feed source assembly, wherein the first reflecting surface, the second reflecting surface, the transmitting feed source assembly and the receiving feed source assembly are arranged on the supporting device; the supporting device is rotatably connected with the servo turntable, the first reflecting surface and the transmitting feed source component form a transmitting antenna, the second reflecting surface and the receiving feed source component form a receiving antenna, and the transmitting feed source component and the receiving feed source component are respectively connected with the transmitting and receiving front ends;
the supporting device comprises a supporting frame, a digital case and a radio frequency case, wherein the digital case and the radio frequency case are arranged on the supporting frame, the transceiving front end is arranged in the radio frequency case, a digital unit is arranged in the digital case, the transceiving front end is connected with the digital unit through a cable, the supporting frame is rotatably connected with the servo turntable, and the first reflecting surface and the second reflecting surface are respectively positioned above and below the radio frequency case;
the transmitting feed source component comprises a transmitting feed source and a transmitting curved waveguide, the dual-reflector radar imaging antenna further comprises a feed source mounting support, the feed source mounting support comprises a first feed source mounting support, the first feed source mounting support is connected with the supporting device, the transmitting feed source is mounted on the first feed source mounting support, one end of the transmitting curved waveguide is connected with the transmitting feed source, and the other end of the transmitting curved waveguide is connected with the transmitting and receiving front end;
the receiving feed source assembly comprises a receiving feed source and a receiving curved waveguide, the double-reflector radar imaging antenna further comprises a feed source mounting support, the feed source mounting support comprises a second feed source mounting support, the second feed source mounting support is connected with the supporting device, the receiving feed source is mounted on the second feed source mounting support, one end of the receiving curved waveguide is connected with the receiving feed source, and the other end of the receiving curved waveguide is connected with the receiving front end;
the receiving feed source comprises a receiving feed source horn, a receiving feed source clapboard circular polarizer, a first receiving feed source right-angled bent waveguide, a second receiving feed source right-angled bent waveguide, a first receiving feed source power divider and a second receiving feed source power divider, one end of the receiving feed source clapboard circular polarizer is connected with the receiving feed source horn, the other two ends are respectively connected with the first receiving feed source right-angled bent waveguide and the second receiving feed source right-angled bent waveguide, the other end of the first receiving feed source right-angled bent waveguide is connected with the first receiving feed source power divider, the other end of the second receiving feed source right-angled bent waveguide is connected with the second receiving feed source power divider, the receiving curved waveguides are two, the first receiving feed source power divider and the second receiving feed source power divider are respectively connected with one end of one receiving curved waveguide, and the other ends of the two receiving curved waveguides are connected with the receiving and transmitting front end;
the double-reflector radar imaging antenna also comprises a feed source adjusting device, the feed source adjusting device comprises a movable plate, a fixed frame, a first adjusting piece, a second adjusting piece and a third adjusting piece, the feed source mounting bracket is connected with the movable plate, the fixed frame is connected with the supporting device, the side surface of the movable plate in the first direction is connected with the fixed frame through the first adjusting piece, so as to adjust the position of the movable plate relative to the fixed frame in the first direction, the side surface of the movable plate in the second direction is connected with the fixed frame through the second adjusting piece, in order to adjust the fly leaf is relative fixed frame in the ascending position of second direction, the side of fly leaf on the third direction passes through the third regulating part with fixed frame is connected, in order to adjust the fly leaf is relative fixed frame in the position of third direction.
2. The dual-reflector radar imaging antenna of claim 1, wherein the transmitting feed comprises a transmitting feed horn, a transmitting feed partition circular polarizer and a transmitting feed power divider connected in sequence, and the transmitting feed power divider is connected to the transmitting curved waveguide.
3. The dual-reflector radar imaging antenna of claim 1, wherein the servo turntable is provided with a servo control system, the servo control system comprises a power supply system, a servo controller and a control device, the power supply system is electrically connected with the servo controller, the servo controller is electrically connected with the control device, and the servo controller is electrically connected with the digital unit and is configured to control the control device to perform corresponding actions according to instructions sent by the digital unit.
4. The dual-reflector radar imaging antenna of claim 1, wherein the servo turntable comprises a carrying case, and an orientation rotating shaft, a torque motor, a rotary encoder and a motor bracket which are arranged in the carrying case, the motor bracket is connected with the carrying case, the torque motor is mounted on the motor bracket, the torque motor is connected with the orientation rotating shaft, the orientation rotating shaft is connected with the supporting frame, and the rotary encoder is arranged on the orientation rotating shaft and is used for measuring rotation angle information of the orientation rotating shaft during movement in real time.
5. The dual-reflector radar imaging antenna of claim 4, wherein the servo turntable further comprises a slip ring, the slip ring comprises a slip ring rotor and a slip ring stator sleeved outside the slip ring rotor, the azimuth axis is connected to the slip ring rotor for driving the slip ring rotor to rotate relative to the slip ring stator, and the slip ring rotor is electrically connected to the digital unit and is electrically connected to an external signal processing device.
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| RU2744210C1 (en) * | 2020-08-07 | 2021-03-03 | Публичное акционерное общество "Научно-производственное объединение "Алмаз" имени академика А.А. Расплетина" (ПАО "НПО "Алмаз") | Small target detection radiolocation station |
| CN112701437B (en) * | 2020-12-22 | 2023-01-31 | 苏州度风科技有限公司 | Multi-beam forming antenna system applied to wind profile radar |
| CN113900085A (en) * | 2021-09-22 | 2022-01-07 | 张海杨 | Radio directional receiving reflectometer capable of receiving signals from multiple directions |
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Address after: No.6 Xingkang South Road, Yuelu District, Changsha City, Hunan Province Applicant after: HUNAN SPACEFLIGHT HUANYU COMMUNICATION TECHNOLOGY Co.,Ltd. Address before: No. 229, tongzipo West Road, Yuelu District, Changsha City, Hunan Province, 410205 Applicant before: HUNAN SPACEFLIGHT HUANYU COMMUNICATION TECHNOLOGY Co.,Ltd. |
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