CN108693507B - Multi-band scanning calibration and radiation detection system based on shaped torus antenna - Google Patents
Multi-band scanning calibration and radiation detection system based on shaped torus antenna Download PDFInfo
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Abstract
The invention discloses a multi-band scanning calibration and radiation detection system based on a forming torus antenna, which comprises the forming torus antenna, a calibration source, a multi-band forming subreflector array, a multi-band receiver, a feed source array, a scanning mechanism, a supporting structure, a control power distribution module, a data acquisition processing module and a platform supporting structure. The invention adopts the torus antenna as the main reflecting surface of the system, realizes the control of a receiving beam directional pattern by shaping design of the torus antenna and the subreflector, and realizes the periodic calibration and scanning detection of the system by fixing the shaped torus antenna and the calibration source and driving a multi-band receiver, a feed source array and a multi-band shaped subreflector array to periodically rotate by using a scanning mechanism.
Description
Technical Field
The invention belongs to the technical field of radiation detection or scanning imaging, and particularly relates to a multi-band scanning calibration and radiation detection system based on a forming torus antenna.
Background
The detection of the atmosphere and the cloud is the most important data source in weather and climate application and is one of the most difficult weather elements to determine, the high-resolution and high-precision detection of the atmosphere and the cloud has important application in the aspects of improving weather prediction and numerical weather forecast precision, enhancing artificial influence weather implementation efficiency and extreme weather prediction capability and the like, and the method has great significance in meeting the increasing demands of climate prediction and weather forecast for military and civilian. The atmosphere and the cloud have rich radiation and scattering spectra in the millimeter wave and terahertz frequency ranges, and a radiometer/detector/imager in the millimeter wave and terahertz frequency ranges has become an important means for detecting the background radiation of the earth atmosphere, the planet atmosphere and the universe, see Peter H.Siegel.THz Instruments for space. IEEE Transactions on Antennas and Propagation,55(11),2957, 2965, 2007.
However, detection and imaging in millimeter wave and terahertz frequency bands are significantly different from optical and low-frequency microwave frequency bands, the optical frequency band is typically two-dimensional imaging realized by a one-dimensional linear array through platform motion or direct imaging through a two-dimensional focal plane receiving array, and the microwave low-frequency band can realize two-dimensional imaging in phased array, multi-input multi-output array and other ways. However, in most cases, the integration difficulty of the feed source and the receiver of millimeter wave and terahertz frequency bands is high, the price is high, the arrayed focal plane high-sensitivity detection and imaging of a large number of receiving channels are difficult to realize, and the problem is solved by a mechanical scanning mode and platform motion by generally adopting a quasi-optical feed network, a feed source array, multiple antennas and a combination mode of the quasi-optical feed network, the feed source array and the multiple antennas. Typical for comparison are EOS/MLS (the Earth maintaining System Microwave Limb sounding) loads on Euler satellites, ICI (Ice Cloud imager) loads on MetOp-SG (Meta optical Operational controlled Generation, Meta Second Generation) satellites to be launched, and advanced Microwave atmospheric sounding instruments on the Fengyun series.
The EOS/MLS load on euler satellites was launched by NASA (National Aeronautics and SpaceAdministration, the united states aerospace agency) in 2004 for applications, the main scientific task being the detection of stratospheric O3, tropospheric O3, pollutants and environmental changes, etc., comprising 3 modules: a GHz radiometer module, which comprises radiometers with the detection frequencies of 118GHz, 190GHz, 240GHz and 640 GHz; 2.5THz radiometer with two polarizations; (iii) spectrometer modules, see Joe W.Waters, Lucien Froedevaux, Robert S.Harwood, et al, The earth operating system microwave bathing sounder (EOS MLS) on The Austa satellite, IEEE transaction on Geoscience and removal Sensing,44(5),1075 + 1092, 2006. The three modules adopt a sub-antenna mode to realize independent scanning imaging, and in order to realize a typical GHz radiometer module, a quasi-optical feed network is adopted to realize scanning calibration and detection of four frequency points and five feed sources. ICI is one of the main loads of the next Generation of eu solar polarization orbital satellites, see D' additive, s., Kangas, v., Klein, u, et al, Ice closed image instrument for metalp second Generation, Microwave Radiometry and Remote Sensing of the Environment (micro rad), 201413 th specific testing on, 228-. Due to the fact that the feed sources are too many and arranged in a feed source array, too large feed source spacing leads to too serious edge feed source deflection and too small spacing, too high requirements for miniaturization integration and heat dissipation of a receiver are provided, and design and development difficulty is very high. The advanced microwave atmosphere detector receiver of Fengyun No. three satellite consists of a high-frequency front end and a medium-low frequency receiver, namely Zhang Shengwei, Wang Zhen Sheng and Sun Luohua, and the design and development of the advanced microwave atmosphere detector system of Fengyun No. three satellite are Chinese engineering science, 15(7), 81-87 and 2013. The high-frequency front end comprises an 89/118.75GHz front end and a 150/183.31GHz front end, and the calibration and scanning detection of four feeds are realized through two quasi-optical feed networks and two antennas. Notably, the entire system uses two heat sources.
The system in the method has too many feed sources, which causes the problems of too large scale of quasi-optical network and too large loss, too focal deflection of edge feed sources in a feed source array, incapability of realizing a common calibration source in a multi-antenna method and the like, so that a method is needed to accommodate more feed sources, ensure beam characteristics, avoid too high requirements on focal deflection and receiver integration (miniaturization) and the like. One idea is to use a torus antenna to achieve multi-beam detection, which has been reported and patented in communications and radar detection, see Biao Du, Edward k.n.yung, Ke-Zhong Yang, et al, Design of multi-beam spatial detectors antennas, Microwave and Optical technology letters,27:5,343-: dai, Zuoxing performs simulation calculation on large angle scanning detection by using a parabolic torus antenna in the aspect of radiation detection, see Dai, Zuoxing, Shang Yuanbo, Liu, Yu, Yuanyun Xuan, et al, Fengwei Design of wire-angle scanning paraolic us refiectarized by rotation of sub-reflector, IELCONF,367-369, 2013; richard E.Cofield et al, JPL (Jetpropulsion laboratory), designed to use a parabolic torus as a secondary reflector to achieve scanning detection of the beam, essentially used a quasi-optical feed network to solve the above problems, see Richard E.Cofield and Eldon P.Kaslm, Thermal stability of a 4meter primary reflector for the scanning Microwave soap, Earth observer Systems XVI,8153,81530Y-1-81530Y-9,2011.
How to adopt the loop surface antenna to realize the periodic calibration and scanning detection of the multi-band detection system does not have an effective method in the prior art.
Disclosure of Invention
The technical problem solved by the invention is as follows: the multi-band scanning calibration and radiation detection system based on the shaped torus antenna is provided, the periodic calibration and scanning detection of the multi-band detection system are realized by adopting the torus antenna, so that more receivers and feed sources are accommodated while the structure is simple, and the problem of deflection of each frequency band is solved.
The purpose of the invention is realized by the following technical scheme: a multi-band scanning calibration and radiation detection system based on a shaped torus antenna comprises: the device comprises a shaped torus antenna, a multi-band shaped subreflector array, a high-temperature calibration source, a low-temperature calibration source, a multi-band receiver, a feed source array, a scanning support structure, a control power distribution module, a data acquisition processing module and a platform support structure; the multi-band shaped subreflector array, the multi-band receiver and feed source array, the control power distribution module and the data acquisition processing module are all arranged on the scanning support structure; the scanning support structure is connected with the platform support structure, and the scanning support structure can rotate around the central axis of the scanning support structure; the shaped torus antenna receives electromagnetic radiation within a specified angle range; the multi-band shaped subreflector array receives electromagnetic radiation; the high-temperature calibration source is arranged on the platform supporting structure and used for providing high-temperature radiation reference; the low-temperature calibration source is arranged on the platform supporting structure and used for providing a low-temperature radiation reference; the scanning support structure takes the axis of the shaped torus antenna as the center to drive the multi-band shaped subreflector array, the multi-band receiver, the feed source array, the control power distribution module and the data acquisition and processing module to periodically rotate, so that the periodic calibration and scanning detection of the system are realized; the control power distribution module is used for distributing and controlling the multi-band shaped subreflector array, the multi-band receiver, the feed source array, the control power distribution module and the data acquisition and processing module; the data acquisition processing module is used for acquiring, processing, storing and transmitting detection data of each frequency band in the multi-band receiver and the feed source array.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the sub-reflecting surfaces of each frequency band in the multi-band shaped sub-reflecting surface array are distributed along the circumference of the central axis of the scanning support structure.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the multi-band receiver and the feed source array comprise a plurality of receiver feed source units; the receiver feed source units are distributed on the surface of the scanning support structure coaxial with the shaped torus antenna in a circumferential manner; each receiver feed source unit comprises a receiver and a feed source; wherein the receiver is connected to the feed.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the phase center of the feed source of each frequency band is superposed with the beam focus formed by the shaped torus antenna and the shaped subreflector of the corresponding frequency band in the multi-band shaped subreflector array; the central axis of the receiving beam of the feed source of each frequency band is superposed with the central axis of the beam formed by the shaped ring surface antenna and the shaped subreflector of the corresponding frequency band in the multi-frequency band shaped subreflector array.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the radiation port surface of the high-temperature calibration source is parallel to the feed source port surface rotating at the same angle, and the distance is within 2 cm.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the scanning support structure comprises a rotating shaft, a motor, a support plate, a conical part and a plurality of support rods; wherein the rotating shaft is connected with the platform supporting structure; the motor is connected with the rotating shaft; the supporting plate is connected with the rotating shaft, and the center of the supporting plate is superposed with the center of the rotating shaft; one end of the conical part is connected with the outer peripheral end of the supporting plate; the sub-reflecting surfaces of each frequency band are connected with the rotating shaft through corresponding supporting rods; a plurality of multiband receiver and feed source units are circumferentially distributed on the surface of the conical part.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the center of the rotating shaft of the scanning supporting structure is superposed with the central axis of the shaped torus antenna.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the rotation center of the multi-band shaped secondary reflecting surface array is overlapped with the central axis of the shaped torus antenna.
In the multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the rotation centers of the multi-band receiver and the feed source array are overlapped with the central axis of the shaped torus antenna.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, periodic calibration and scanning detection can be realized only by rotating the feed source array and the subreflector through the scanning support structure, so that the quality of a rotating part of the system is greatly reduced, and the service life of the system is favorably ensured;
(2) the multi-band receiver and the feed source array are circumferentially distributed on the conical surface coaxial with the shaped torus antenna, so that the system can hold more receivers and feed sources while keeping simple structure, and each frequency band has no deflection problem.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a block diagram of a multiband scanning calibration and radiation detection system based on a shaped torus antenna according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a multiband receiver and a feed array according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a block diagram of a multiband scanning calibration and radiation detection system based on a shaped torus antenna according to an embodiment of the present invention. As shown in fig. 1, the multiband scanning calibration and radiation detection system based on the shaped torus antenna comprises: the device comprises a shaped torus antenna 1, a multi-band shaped subreflector array 2, a high-temperature calibration source 3, a low-temperature calibration source 4, a multi-band receiver and feed source array 5, a scanning support structure 6, a control power distribution module 7, a data acquisition processing module 8 and a platform support structure 9; wherein,
the multi-band shaped subreflector array 2, the multi-band receiver and feed source array 5, the control power distribution module 7 and the data acquisition processing module 8 are all arranged on the scanning support structure 6; the scanning support structure 6 and the platform support structure 9 are connected, the scanning support structure 6 being rotatable about its central axis; the shaped torus antenna 1 receives electromagnetic radiation within a specified angle range; the multi-band shaped subreflector array 2 receives electromagnetic radiation; the high-temperature calibration source 3 is arranged on the platform supporting structure 9 and used for providing a high-temperature radiation reference; the low-temperature calibration source 4 is arranged on the platform supporting structure 9 and used for providing a low-temperature radiation reference; the scanning support structure 6 takes the axis of the shaped torus antenna 1 as the center to drive the multi-band shaped subreflector array 2, the multi-band receiver and feed source array 5, the control power distribution module 7 and the data acquisition processing module 8 to periodically rotate, so that the periodic calibration and scanning detection of the system are realized; the control power distribution module 7 is used for distributing and controlling the multi-band shaped subreflector array 2, the multi-band receiver and feed source array 5, the control power distribution module 7 and the data acquisition processing module 8; the data acquisition processing module 8 is used for acquiring, processing, storing and transmitting detection data of each frequency band in the multi-band receiver and the feed source array 5.
As shown in fig. 2, the sub-reflecting surfaces 13 of each frequency band in the multi-band shaped sub-reflecting surface array 2 are distributed along the circumference of the central axis of the scanning support structure 6.
As shown in fig. 2, the multiband receiver and feed array 5 comprises a plurality of receiver feed units; wherein,
a plurality of receiver feed source units are distributed on the surface of a scanning support structure 6 coaxial with the shaped torus antenna 1 in a circumferential manner; each receiver feed unit comprises a receiver 10 and a feed 11; wherein the receiver 10 and the feed 11 are connected.
The phase center of the feed source 11 of each frequency band is superposed with the beam focus formed by the shaped annular surface antenna 1 and the shaped subreflector of the corresponding frequency band in the multi-frequency band shaped subreflector array 2; the central axis of the receiving beam of the feed source 11 of each frequency band is superposed with the central axis of the beam formed by the shaped annular surface antenna 1 and the shaped sub-reflecting surface of the corresponding frequency band in the multi-band shaped sub-reflecting surface array 2.
As shown in fig. 1, the scanning support structure 6 includes a rotation shaft 62, a motor 63, a support plate 64, a conical portion 61, and a plurality of support rods 65; wherein,
the spindle 62 is connected to the platform support structure 9. The shaft 62 is able to rotate about its central axis. The motor 63 is connected to the rotating shaft 62. The motor 63 provides a rotational force to the rotating shaft 62. The support plate 64 is connected to the rotating shaft 62, and the center of the support plate 64 coincides with the center of the rotating shaft 62. One end of the conical portion 61 is connected to the outer circumferential end of the support plate 64. The bottom end of the conical portion 61 is fixedly connected to the outer circumferential end of the support plate 64. The sub-reflecting surfaces 13 of the respective frequency bands are connected to the rotating shaft 62 through the corresponding support rods 65. A plurality of multiband receiver and feed elements are distributed circumferentially on the surface of the conical section 61. The central axis of the conical portion 61 coincides with the central axis of the shaped torus antenna 1.
As shown in fig. 1, the shaped torus antenna 1, the high temperature calibration source 3 and the low temperature calibration source 4 are fixed on the platform support structure 9 and are respectively arranged with the central axis of the scanning support structure 6 as the axis.
As shown in fig. 2, in the periodic calibration and scanning detection process, the positions of the shaped sub-reflectors in each frequency band in the shaped sub-reflector array 2, the receivers in the corresponding frequency bands in the multiband receiver and the feed source array 5 and the feed source are kept relatively fixed by the scanning support structure 6.
As shown in fig. 1, when a shaped subreflector in a certain frequency band in the shaped subreflector array 2 is driven by the scanning support structure 6 to rotate in an angle range facing the shaped torus antenna 1, the shaped torus antenna 1 receives electromagnetic radiation of a beam coverage area, and then the electromagnetic radiation is reflected by the surface of the shaped torus antenna 1 and transmitted to the shaped subreflector, the shaped subreflector shapes and reflects the beam and transmits the beam to a feed source in a corresponding frequency band, the frequency band feed source feeds the received electromagnetic radiation into a receiver, the receiver converts and processes the electromagnetic radiation and transmits the electromagnetic radiation to a data acquisition processing module 8, and finally the data acquisition processing module 8 acquires, processes, stores and transmits the signal.
As shown in fig. 1, when a frequency band forming subreflector in the forming subreflector array 2 sequentially rotates to face a hot calibration source and a cold calibration source, radiation of the hot calibration source or the cold calibration source is directly collected by a feed source of the frequency band or is sequentially reflected and transmitted by the frequency band forming subreflector and collected by a corresponding feed source, and then enters a receiver to be converted and processed, and finally transmitted to a data acquisition processing module 8, so that the signals are acquired, processed, stored and transmitted.
As shown in fig. 1, in a periodic rotation process of a frequency band shaped subreflector in the shaped subreflector array 2, the data acquisition and processing module 8 may sequentially obtain electromagnetic radiation receiving detection data when the frequency band shaped subreflector passes through the shaped torus antenna, the hot calibration source and the cold calibration source, and since a signal obtained by the data acquisition and processing module 8 and an electromagnetic radiation signal intensity received by the feed source are in a linear relationship, under the condition that the electromagnetic radiation signal intensities of the hot calibration source and the cold calibration source are known, the electromagnetic radiation signal intensities of the shaped subreflector facing different positions of the shaped torus antenna 1 may be calculated, so as to obtain electromagnetic radiation information of a detection region facing the shaped torus antenna 1 at the position. Through the rotary scanning and the movement of the platform on which the system is positioned, the system finally realizes the scanning, detection and imaging of a certain area.
Specifically, as shown in fig. 1, the system proposed in this embodiment includes a forming torus antenna 1, a multi-band forming subreflector array 2, a high-temperature calibration source 3, a low-temperature calibration source 4, a multi-band receiver and feed source array 5, a scanning support structure 6, a control power distribution module 7, a data acquisition and processing module 8, and a platform support structure 9. The shaped torus antenna 1 is fixed on a platform supporting structure 9, and is shaped with the multi-band shaped subreflector array 2 according to the application requirements of the system, so that the electromagnetic radiation within the angle range required by the application of the system is received from the detection area.
As shown in fig. 2, the detection frequency bands are 118GHz V-polarized radiation, 183GHz V-polarized radiation, 220GHz V-polarized radiation, 325GHz V-polarized radiation, and 667GHz V-polarized radiation, respectively, and the centers of the 7 frequency bands of the sub-reflecting surfaces are sequentially distributed on a circular ring coaxial with the torus antenna without shielding electromagnetic radiation that should be received by adjacent sub-reflecting surfaces; the phase center and the central axis of the receiving beam of the feed source 11 of each frequency band coincide with the beam focus and the central axis of the beam formed by the shaped sub-reflecting surface of the corresponding frequency band in the shaped torus antenna 1 and the multi-band shaped sub-reflecting surface array 2; the receivers 10 of each frequency band are located immediately behind the corresponding feed and are fixed on the conical edge of the disc support structure of the scanning mechanism with a fixed axis for fixing the shaped subreflector 13. The high-temperature calibration source 3 and the low-temperature calibration source 4 are positioned according to the system application, so that the high-temperature calibration source and the low-temperature calibration source are fixed in a specific area together with the platform supporting structure 9, high-temperature and low-temperature radiation references are provided for a detection system, and the rotary motion of the multi-band shaped subreflector array 2 and the multi-band receiver and feed source array 5 is not influenced.
During rotary scanning, taking detection of a 118GHz frequency band as an example, the receiver 10 and the feed source 11 of the frequency band and the shaped subreflector 13 periodically rotate around the axis of the shaped torus antenna as a center, and sequentially pass through the high-temperature calibration source 3, the low-temperature calibration source 4 and the shaped torus antenna 1, so that scanning detection of the hot calibration source, the cold calibration source and the detection region is respectively realized. When the 118GHz frequency band receiver and the feed source together with the forming auxiliary reflecting surface pass through the angle direction of the high-temperature calibration source, the radiation port surface of the feed source is parallel to the source port surface of the high-temperature calibration source and the distance is within 2cm, so that the calibration from the port surface to the port surface is realized; when the 118GHz frequency band receiver and the feed source together with the shaped auxiliary reflecting surface pass through the angle direction of the low-temperature calibration source, the feed source or the auxiliary reflecting surface receives the radiation of the low-temperature calibration source or the cold air radiation reflected by the low-temperature calibration source, so that low-temperature calibration is realized; when the 118GHz band receiver and the feed source together with the shaped sub-reflector 13 pass through the range of the shaped torus antenna 1, the receiver receives the radiation of the area faced by the shaped torus antenna from the feed source and the corresponding sub-reflector in turn. Through rotation, the data acquisition processing module 8 can sequentially obtain electromagnetic radiation receiving detection data when the 118GHz band shaped subreflector passes through the shaped torus antenna, the hot calibration source and the cold calibration source, and because the signal parameters obtained by the data acquisition processing module 8 and the intensity of the electromagnetic radiation signal received by the feed source form a linear relationship, under the condition that the intensity of the electromagnetic radiation signal of the hot calibration source and the intensity of the electromagnetic radiation signal of the cold calibration source are known, the electromagnetic radiation information of a detection area facing the 118GHz band shaped torus antenna 1 can be calculated. Through the rotary scanning and the movement of the platform on which the system is arranged, the system finally realizes the scanning detection imaging of the designed specific area.
The power distribution and control of the receiver and the scanning mechanism in the working process of the system are realized by a control power distribution module 7; the acquisition, processing, storage and transmission of the detection data of each frequency band receiver are realized by a data acquisition and processing module 8, and a control power distribution module 7, the data acquisition and processing module 8 is arranged on a scanning support structure 6 and rotates together with the multi-frequency band shaped subreflector array 2, the multi-frequency band receiver and the feed source array 5.
The embodiment provides a system scheme that a shaped torus antenna is used as a main reflecting surface, and a multi-band receiver, a feed source and a shaped auxiliary reflecting surface are circumferentially distributed near a conical surface coaxial with the torus antenna, so that the system can hold more receivers and feed sources while keeping simple structure, and each frequency band has no deflection problem. The system realizes the wave beam required in the application through the shaping design of the torus antenna and the subreflector, and when the system works, the system can realize periodic calibration and scanning detection imaging only by rotating the feed source array and the subreflector, thereby greatly reducing the quality of the rotating part of the system, being beneficial to ensuring the service life of the system and providing an effective system solution for multi-band radiation scanning detection.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A multi-band scanning calibration and radiation detection system based on a shaped torus antenna is characterized by comprising: the device comprises a shaped torus antenna (1), a multi-band shaped subreflector array (2), a high-temperature calibration source (3), a low-temperature calibration source (4), a multi-band receiver and feed source array (5), a scanning support structure (6), a control power distribution module (7), a data acquisition processing module (8) and a platform support structure (9); wherein,
the multi-band shaped subreflector array (2), the multi-band receiver and feed source array (5), the control power distribution module (7) and the data acquisition processing module (8) are all arranged on the scanning support structure (6);
the scanning support structure (6) is connected with the platform support structure (9), and the scanning support structure (6) can rotate around the central axis of the scanning support structure (6);
the shaped torus antenna (1) is arranged on the platform supporting structure (9), receives electromagnetic radiation within a specified angle range, and reflects the electromagnetic radiation to the multi-band shaped subreflector array (2);
the multi-band shaped subreflector array (2) receives electromagnetic radiation;
the multi-band receiver and the feed source array (5) receive electromagnetic radiation from the multi-band shaped subreflector array (2), convert the electromagnetic radiation into detection data and transmit the detection data to the data acquisition and processing module (8);
the high-temperature calibration source (3) is arranged on the platform supporting structure (9) and is used for providing high-temperature radiation reference;
the low-temperature calibration source (4) is arranged on the platform supporting structure (9) and is used for providing a low-temperature radiation reference;
the scanning support structure (6) drives the multi-band forming subreflector array (2), the multi-band receiver and feed source array (5), the control power distribution module (7) and the data acquisition processing module (8) to periodically rotate by taking the axis of the forming torus antenna (1) as the center, so that the periodic calibration and scanning detection of the system are realized;
the control power distribution module (7) is used for distributing and controlling the multi-band shaped subreflector array (2), the multi-band receiver and feed source array (5), the control power distribution module (7) and the data acquisition processing module (8);
the data acquisition processing module (8) is used for acquiring, processing, storing and transmitting detection data of each frequency band in the multi-band receiver and the feed source array (5).
2. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 1, wherein: the sub-reflecting surfaces (13) of each frequency band in the multi-band shaped sub-reflecting surface array (2) are distributed along the circumference of the central axis of the scanning supporting structure (6).
3. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 1, wherein: the multi-band receiver and feed array (5) comprises a plurality of receiver feed units; wherein,
a plurality of receiver feed source units are distributed on the surface of a scanning support structure (6) coaxial with the shaped torus antenna (1) in a circumferential manner;
each receiver feed unit comprises a receiver (10) and a feed (11); wherein the receiver (10) is connected to the feed (11).
4. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 3, wherein:
the phase center of the feed source (11) of each frequency band is superposed with the beam focus formed by the shaped annular antenna (1) and the shaped subreflector of the corresponding frequency band in the multi-band shaped subreflector array (2).
5. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 4, wherein:
the central axis of the receiving beam of the feed source (11) of each frequency band is superposed with the central axis of the beam formed by the shaped torus antenna (1) and the shaped subreflector of the corresponding frequency band in the multi-band shaped subreflector array (2).
6. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 3, wherein: the radiation opening surface of the high-temperature calibration source (3) is parallel to the opening surface of the feed source (11) rotating at the same angle and the distance is within 2 cm.
7. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 3, wherein: the scanning support structure (6) comprises a rotating shaft (62), a motor (63), a support plate (64), a conical part (61) and a plurality of support rods (65); wherein,
the rotating shaft (62) is connected with the platform supporting structure (9);
the motor (63) is connected with the rotating shaft (62);
the support plate (64) is connected with the rotating shaft (62), and the center of the support plate (64) is superposed with the center of the rotating shaft (62);
one end of the conical part (61) is connected with the outer peripheral end of the supporting plate (64);
the sub-reflecting surface (13) of each frequency band is connected with the rotating shaft (62) through a corresponding supporting rod (65);
a plurality of multiband receiver and feed elements are distributed circumferentially on the surface of the conical section (61).
8. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 6, wherein: the center of a rotating shaft (62) of the scanning support structure (6) is superposed with the central axis of the shaped torus antenna (1).
9. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 6, wherein: the rotation center of the multi-band shaped subreflector array (2) is superposed with the central axis of the shaped torus antenna (1).
10. The multi-band scanning calibration and radiation detection system based on a shaped torus antenna of claim 6, wherein: the rotation centers of the multi-band receiver and the feed source array (5) are superposed with the central axis of the shaped torus antenna (1).
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| CN110609330B (en) * | 2019-09-06 | 2021-03-26 | 北京理工大学 | Sparse array real-beam electric scanning rapid imaging system |
| CN113218510B (en) * | 2021-05-13 | 2022-05-27 | 上海航天测控通信研究所 | Feed source mouth surface external calibration device of satellite-borne one-dimensional synthetic aperture radiometer |
| CN116577747B (en) * | 2023-07-12 | 2023-09-15 | 中国科学院空天信息创新研究院 | System and method for testing reliability of stratospheric radar phased array antenna |
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