CN108693507B - A Multi-band Scanning Calibration and Radiation Detection System Based on Shaped Loop Antenna - Google Patents

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

A Multi-band Scanning Calibration and Radiation Detection System Based on Shaped Loop Antenna

technical field

The invention belongs to the technical field of radiation detection or scanning imaging, and in particular relates to a multi-band scanning calibration and radiation detection system based on a shaped torus antenna.

Background technique

The detection of atmosphere and clouds is the most important data source in meteorological and climate applications, and it is also one of the most difficult meteorological elements to determine. It has important applications in many aspects such as weather implementation efficiency and extreme weather forecasting ability, which is of great significance to meet the growing demands of military and civilian climate forecasting and weather forecasting. The atmosphere and clouds have rich radiation and scattering spectra in the millimeter-wave and terahertz frequency bands. Radiometers/detectors/imagers in the millimeter-wave and terahertz frequency bands have become important means of detecting the Earth's atmosphere, planetary atmospheres and cosmic background radiation. See Peter H. Siegel. THz Instruments for Space. IEEE Transactions on Antennas and Propagation, 55(11), 2957-2965, 2007.

However, the detection and imaging in the millimeter wave and terahertz frequency bands are significantly different from the optical and low-frequency microwave frequency bands. The optical frequency band is typically a one-dimensional linear array to achieve two-dimensional imaging through platform motion or through a two-dimensional focal plane. The receiving array performs imaging directly, while the low-frequency microwave frequency uses phased arrays and multiple-input multiple-output arrays to achieve two-dimensional imaging. However, in most cases, the integration of feeds and receivers in the millimeter wave and terahertz frequency bands is difficult and expensive, and it is difficult to achieve high-sensitivity detection and imaging of arrayed focal planes with a large number of receiving channels. Source arrays, multiple antennas, and their combinations are addressed by mechanical scanning and stage motion. The typical ones are the EOS/MLS (The Earth Observing System Microwave Limb Sounder) payload on the Euler satellite, the ICI (Ice Cloud Imager) payload on the upcoming MetOp-SG (Meteorological Operational Second Generation, MetOp second generation) satellite and the Advanced Microwave Atmospheric Sounder on the Fengyun series.

The EOS/MLS payload on the Euler satellite was launched and applied by NASA (National Aeronautics and Space Administration, NASA) in 2004. The main scientific mission is to detect O3 in the stratosphere, O3 in the troposphere, pollutants and environmental changes, including 3 modules: ①GHz radiometer module, including radiometers with detection frequencies of 118GHz, 190GHz, 240GHz and 640GHz; ②2.5THz radiometer with two polarizations; ③Spectrometer module, see Joe W. Waters, Lucien Froidevaux, Robert S. Harwood, et al., The earth observing system microwave limb sounder (EOS MLS) on the Aura satellite, IEEE Transactionson Geoscience and Remote Sensing, 44(5), 1075-1092, 2006. The three modules use separate antennas to achieve separate scanning imaging, and in order to achieve a typical GHz radiometer module, a quasi-optical feed network is used to achieve scanning calibration and detection of four frequency points and five feeds. ICI is one of the main payloads of the next generation EU solar polarized orbiting satellites, see D'Addio, S., Kangas, V., Klein, U., et al., Ice cloud imager instrument for MetOpSecond Generation, Microwave Radiometry and Remote Sensing of the Environment (MicroRad), 2014 13th Specialist Meeting on, 228-231, Espoo, 2014., The payload system covers 5 terahertz channels in the range of 183 to 664 GHz, of which the 243 and 664 GHz channels are designed with dual polarization. Because there are too many feeds, the feed array is arranged, and the distance between the feeds is too large, which leads to too serious defocusing of the edge feed and too small distance, which puts forward high requirements for the miniaturized integration and heat dissipation of the receiver. The design and development of Extremely difficult. Fengyun-3 satellite advanced microwave atmospheric sounder receiver consists of high-frequency front-end, medium and low frequency receivers, see Zhang Shengwei, Wang Zhenzhan and Sun Maohua, etc., Fengyun-3 satellite advanced microwave atmospheric sounder system design and development, China Engineering Science, 15 ( 7), 81-87, 2013. The high-frequency front-end includes 89/118.75GHz front-end and 150/183.31GHz front-end. The calibration and scanning detection of four feeds are realized through two quasi-optical feed networks and two antennas. It is worth noting that the entire system uses two heat sources.

The system in the above method has too many feeds, which will lead to many problems such as the large scale of the quasi-optical network and the excessive loss, the excessively defocused edge feeds in the feed array, and the inability to achieve a shared calibration source in the multi-antenna method. There is a need for a method that can accommodate more feeds, ensure beam characteristics, and avoid problems such as off-focus and high requirements for receiver integration (miniaturization). One idea is to use a loop antenna to achieve multi-beam detection, which has appeared in some reports and patents in communications and radar detection, see Biao Du, Edward K.N.Yung, Ke-Zhong Yang, et al., Design ofmultibeam parabolic torus reflector antennas, Microwave and Optical Technology Letters, 27:5, 343-347, 2000. See also the literature: Dai Zuoxing, Shang Yuanbo, Xuan Xiaobo, etc., A beam continuous scanning double reflector antenna, CN201420455395.X. In radiation detection , Dai, Zuoxing made a simulation calculation for wide-angle scanning detection using parabolic torus antenna, see Dai, Zuoxing, Shang Yuanbo, Liu, Yuanyun Xuan, et al., Fengwei Design of wide-angle scanning parabolic torus reflector antenna realized by rotation of sub-reflector, IELCONF, 367-369, 2013.; Richard E. Cofield et al. of JPL (JetPropulsion Laboratory) designed a parabolic torus as a sub-reflector to realize beam scanning detection, but essentially still uses quasi-optical feed Electric network to solve the above problem, see Richard E. Cofield and Eldon P. Kaslm, Thermal stability of a 4meter primary reflector for the Scanning Microwave Limb Sounder, Earth Observing Systems XVI, 8153, 81530Y-1-81530Y-9, 2011.

There is no effective method in the prior art on how to implement periodic calibration and scanning detection of a multi-band detection system by using a torus antenna.

SUMMARY OF THE INVENTION

The technical problem solved by the invention is: to overcome the deficiencies of the prior art, a multi-band scanning calibration and radiation detection system based on a shaped toroid antenna is provided, and the torus antenna is used to realize the periodic calibration of the multi-band detection system and scanning detection, making the structure simple and accommodating more receivers and feeds, and there is no defocusing problem in each frequency band.

The object of the present invention is achieved through the following technical solutions: a multi-band scanning calibration and radiation detection system based on a shaped torus antenna, comprising: a shaped torus antenna, a multi-band shaped sub-reflector array, a high-temperature calibration source , low temperature calibration source, multi-band receiver and feed array, scanning support structure, control power distribution module, data acquisition and processing module and platform support structure; wherein, the multi-band shaping sub-reflector array, the multi-band The receiver and feed array, the control power distribution module and the data acquisition and 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 surround Its central axis rotates; the shaped torus antenna receives electromagnetic radiation in a specified angular range; the multi-band shaped sub-reflector array receives electromagnetic radiation; the high-temperature calibration source is arranged on the platform support structure and is used for providing a high temperature radiation reference; the low temperature calibration source is arranged on the platform support structure to provide a low temperature radiation reference; the scanning support structure drives the multi-band shaped sub-reflector array with the axis of the shaped loop antenna as the center , multi-band receiver and feed array, control power distribution module and data acquisition and processing module to perform periodic rotation to realize periodic calibration and scanning detection of the system; the control power distribution module is used to shape sub-reflections for multi-band Area array, multi-band receiver and feed array, control power distribution module and data acquisition and processing module perform power distribution and control; the data acquisition and processing module is used for the detection data of each frequency band in the multi-band receiver and feed array. Acquisition, processing, storage and transmission.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped loop antenna, the sub-reflectors of each frequency band in the multi-band shaped sub-reflector array are distributed along the circumference of the central axis of the scanning support structure.

In the above-mentioned multi-band scanning calibration and radiation detection system based on shaped loop antenna, the multi-band receiver and feed array include multiple receiver feed units; The torus-shaped torus antenna is distributed circumferentially on the surface of the coaxial scanning support structure; each receiver feed unit includes a receiver and a feed; wherein the receiver and the feed are connected.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped torus antenna, the phase center of the feed in each frequency band is related to the shaped sub-reflection of the corresponding frequency band in the shaped torus antenna and the multi-band shaped sub-reflector array. The focal points of the beams formed by the surface coincide; the central axis of the receiving beam of the feed in each frequency band is coincident with the central axis of the beam formed by the shaped torus antenna and the shaped sub-reflectors of the corresponding frequency bands in the multi-band shaped sub-reflector array.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped loop antenna, the radiation port surface of the high temperature calibration source is parallel to the feed port surface rotated at the same angle and the distance is within 2cm.

In the above-mentioned multi-band scanning calibration and radiation detection system based on shaped loop antenna, the scanning support structure includes a rotating shaft, a motor, a support plate, a conical portion and a plurality of support rods; wherein, the rotating shaft and the platform support structure are in phase with each other. The motor is connected with the rotating shaft; the supporting plate is connected with the rotating shaft, the center of the supporting plate is coincident with the center of the rotating shaft; one end of the conical part is in line with the outer peripheral end of the supporting plate connection; the sub-reflection surfaces of each frequency band are connected with the rotating shaft through corresponding support rods; a plurality of multi-band receivers and feed units are circumferentially distributed on the surface of the cone.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped loop antenna, the center of the rotating shaft of the scanning support structure coincides with the central axis of the shaped loop antenna.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped loop antenna, the rotation center of the multi-band shaped sub-reflector array coincides with the central axis of the shaped loop antenna.

In the above-mentioned multi-band scanning calibration and radiation detection system based on the shaped loop antenna, the rotation centers of the multi-band receiver and the feed array coincide with the central axis of the shaped loop antenna.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention only needs to rotate the feed array and the sub-reflection surface by scanning the support structure to realize periodic calibration and scanning detection, which greatly reduces the quality of the rotating part of the system and is beneficial to guarantee the life of the system;

(2) In the present invention, the multi-band receiver and feed array are arranged in a circle on the conical surface coaxial with the shaped loop antenna, so the system can keep the structure simple while accommodating more receivers and feeds, and There is no out-of-focus problem in each frequency band.

Description of 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 for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a structural block diagram of a multi-band scanning calibration and radiation detection system based on a shaped loop antenna provided by an embodiment of the present invention;

FIG. 2 is a schematic plan view of a multi-band receiver and a feed array provided by an embodiment of the present invention.

Detailed ways

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 by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

FIG. 1 is a structural block diagram of a multi-band scanning calibration and radiation detection system based on a shaped loop antenna provided by an embodiment of the present invention. As shown in Figure 1, the multi-band scanning calibration and radiation detection system based on the shaped toroid antenna includes: a shaped torus antenna 1, a multi-band shaped sub-reflector array 2, a high-temperature calibration source 3, a low-temperature calibration source Target source 4, multi-band receiver and feed array 5, scanning support structure 6, control power distribution module 7, data acquisition and processing module 8 and platform support structure 9; wherein,

The multi-band shaped sub-reflector array 2, the multi-band receiver and feed array 5, the control power distribution module 7 and the data acquisition and 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 , the scanning support structure 6 can rotate around its central axis; the shaped torus antenna 1 receives electromagnetic radiation in a specified angular range; the multi-band shaped sub-reflector array 2 receives electromagnetic radiation; the high-temperature calibration source 3 is arranged on the platform support structure 9 , used to provide a high temperature radiation reference; the low temperature calibration source 4 is arranged on the platform support structure 9 to provide a low temperature radiation reference; the scanning support structure 6 takes the axis of the shaped toroid antenna 1 as the center to drive the multi-band shaped sub-reflector Array 2, multi-band receiver and feed array 5, control power distribution module 7 and data acquisition and processing module 8 perform periodic rotation to realize periodic calibration and scanning detection of the system; control power distribution module 7 is used for multi-band Shaped sub-reflector array 2, multi-band receiver and feed array 5, control power distribution module 7 and data acquisition and processing module 8 for power distribution and control; data acquisition and processing module 8 is used for multi-band receivers and feeds. The acquisition, processing, storage and transmission of the detection data of each frequency band in the array 5.

As shown in FIG. 2 , the sub-reflection surfaces 13 of each frequency band in the multi-band shaped sub-reflection surface array 2 are distributed along the circumference of the central axis of the scanning support structure 6 .

As shown in Figure 2, the multi-band receiver and feed array 5 includes a plurality of receiver feed units; wherein,

A plurality of receiver feed units are distributed circumferentially on the surface of the scanning support structure 6 coaxial with the shaped loop antenna 1; each receiver feed unit includes a receiver 10 and a feed 11; wherein the receiver 10 and The feed 11 is connected.

The phase center of the feed 11 of each frequency band coincides with the beam focus formed by the shaped torus antenna 1 and the shaped sub-reflector of the corresponding frequency band in the multi-band shaped sub-reflector array 2; the receiving beam of the feed 11 of each frequency band The central axis coincides with the central axis of the beam formed by the shaped torus antenna 1 and the shaped sub-reflectors of the corresponding frequency bands in the multi-band shaped sub-reflector array 2 .

As shown in FIG. 1 , the scanning support structure 6 includes a rotating shaft 62, a motor 63, a support plate 64, a conical portion 61 and a plurality of support rods 65; wherein,

The rotating shaft 62 is connected to the platform support structure 9 . The rotating shaft 62 can rotate around its own central axis. The motor 63 is connected to the rotating shaft 62 . The motor 63 provides rotational force to the rotating shaft 62 . The support plate 64 is connected with 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 peripheral end of the support plate 64 . The bottom end of the conical portion 61 is fixedly connected to the outer peripheral end of the support plate 64 . The sub-reflection surfaces 13 of each frequency band are connected to the rotating shaft 62 through corresponding support rods 65 . A plurality of multi-band receiver and feed units are distributed circumferentially on the surface of the cone 61 . The central axis of the conical portion 61 coincides with the central axis of the shaped loop antenna 1 .

As shown in FIG. 1 , the shaped loop 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 around the central axis of the scanning support structure 6 .

As shown in Figure 2, in the process of periodic calibration and scanning detection, each frequency band shaped sub-reflector in the shaped sub-reflector array 2 passes through the corresponding frequency band receivers and feeds in the multi-band receiver and feed array 5. The scanning support structure 6 remains relatively fixed in position.

As shown in FIG. 1 , when the shaped sub-reflection surface of a certain frequency band in the shaped sub-reflector array 2 is rotated to face the angle range of the shaped torus antenna 1 under the driving of the scanning support structure 6, the shaped torus is firstly formed by the shaped torus Antenna 1 receives the electromagnetic radiation in the area covered by its beam, and then reflects it through its surface and propagates it to the shaped sub-reflector. The feeder feeds the received electromagnetic radiation into the receiver, and the receiver performs signal conversion and certain processing on the electromagnetic radiation, and then transmits the signal to the data acquisition and processing module 8. Finally, the data acquisition and processing module 8 collects, processes, and processes the signal. storage and transmission.

As shown in Figure 1, when the shaped sub-reflector of a certain frequency band in the shaped sub-reflector array 2 rotates to face the hot calibration source and the cold calibration source in turn, the radiation of the hot calibration source or the cold calibration source is determined by the frequency band. The direct collection of the feed or the reflection and propagation of the sub-reflector and the collection of the corresponding feed through the frequency band shape sub-reflector in turn, and then enter the receiver for signal conversion and processing, and finally pass to the data acquisition and processing module 8, and then Acquire, process, store and transmit signals.

As shown in FIG. 1 , during a period of rotation of the shaped sub-reflection surface of a certain frequency band in the shaped sub-reflector array 2, the data acquisition and processing module 8 can sequentially obtain the shaped sub-reflection surface of the frequency band through the shaped torus antenna. , the electromagnetic radiation reception detection data of the thermal calibration source and the cold calibration source, since the signal obtained by the data acquisition and processing module 8 has a linear relationship with the electromagnetic radiation signal intensity received by the feed source, it is known that the thermal calibration source and the cold calibration source are In the case of the electromagnetic radiation signal strength of the target source, the electromagnetic radiation signal strength when the shaped sub-reflector faces different positions of the shaped loop antenna 1 can be calculated, and then the detection area of the shaped loop antenna 1 facing the position can be obtained. Electromagnetic radiation information. Through the rotation scanning and the movement of the platform where the system is located, the system finally realizes the scanning and detection imaging of a certain area.

Specifically, as shown in FIG. 1 , the system proposed in this embodiment includes a shaped torus antenna 1 , a multi-band shaped sub-reflector array 2 , a high-temperature calibration source 3 , a low-temperature calibration source 4 , and a multi-band receiver. And feed array 5 , scanning support structure 6 , control power distribution module 7 , data acquisition and processing module 8 and platform support structure 9 . The shaped loop antenna 1 is fixed on the platform support structure 9, and the multi-band shaped sub-reflector array 2 is shaped and designed according to the system application requirements, so as to receive electromagnetic radiation in the angular range required by the system application from the detection area.

As shown in Figure 2, the detection frequency bands are V-polarized radiation at 118 GHz, V-polarized radiation at 183 GHz, V- and H-polarized radiation at 220 GHz, V-polarized radiation at 325 GHz, and V- and H-polarized radiation at 667 GHz , the centers of the sub-reflectors of the 7 frequency bands are distributed in turn on the ring coaxial with the loop antenna, and do not block the electromagnetic radiation that should be received by the adjacent sub-reflectors; The central axis of the beam coincides with the beam focus and the central axis of the beam formed by the shaped sub-reflectors of the corresponding frequency bands in the shaped torus antenna 1 and the multi-band shaped sub-reflector array 2; The feed is behind and fixed on the conical rim of the disk support structure with the scanning mechanism for fixing the fixed axis of the shaped secondary reflector 13 . The high-temperature calibration source 3 and the low-temperature calibration source 4 determine their placement positions according to the system application, so that they are fixed in a specific area together with the platform support structure 9 to provide high-temperature and low-temperature radiation references for the detection system, but do not affect the multi-band shaping Rotational motion of sub-reflector array 2 and multi-band receiver and feed array 5.

During the rotational scanning, taking the detection of the 118 GHz frequency band as an example, the receiver 10 and the feed 11 in this frequency band together with the shaped sub-reflector 13 periodically rotate around the axis of the shaped torus antenna, and pass through the high temperature calibration source 3 in turn. , a low temperature calibration source 4 and a shaped torus antenna 1, respectively, to realize the scanning detection of the thermal calibration source, the cold calibration source and the detection area. When the 118GHz frequency band receiver and feed, together with the shaped sub-reflector, pass through the angular direction of the high temperature calibration source, the feed radiation port surface is parallel to the high temperature calibration source port surface and the distance is within 2cm, so that the mouth surface to the mouth surface can be realized. When the 118GHz frequency band receiver and feed together with the shaped sub-reflector pass through the angular direction of the low-temperature calibration source, the feed or sub-reflector receives the radiation of the low-temperature calibration source itself or the reflected cold air radiation. , to achieve low temperature calibration; when the 118GHz frequency band receiver and feed together with the shaped sub-reflector 13 pass through the range of the shaped torus antenna 1, its receiver receives the shaped torus from the feed and the corresponding sub-reflector in turn. Radiation from the area facing the antenna. Through rotation, the data acquisition and processing module 8 can sequentially obtain the electromagnetic radiation reception detection data when the shaped sub-reflector in the 118 GHz frequency band passes through the shaped torus antenna, the thermal calibration source and the cold calibration source. There is a linear relationship between the signal parameters and the electromagnetic radiation signal strength received by the feed. When the electromagnetic radiation signal strengths of the hot calibration source and the cold calibration source are known, it is possible to calculate the detection direction of the shaped loop antenna 1 in the 118GHz frequency band. Electromagnetic radiation information for the area. Through the rotation scanning and the movement of the platform where the system is located, the system finally realizes the scanning detection and imaging of the designed specific area.

During the working process of the system, the power distribution and control of the receiver and the scanning mechanism are all realized by the control power distribution module 7; The electrical module 7 and the data acquisition and processing module 8 are placed on the scanning support structure 6 and rotate together with the multi-band shaped sub-reflector array 2 and the multi-band receiver and feed array 5 .

This embodiment proposes a system scheme in which the shaped loop antenna is used as the main reflector, and the multi-band receiver, feed source and shaped sub-reflector are arranged in a circle near the conical surface coaxial with the loop antenna. The system can maintain The structure is simple and accommodates more receivers and feeds, and there is no defocusing problem in each frequency band. The system realizes the beam required in the application through the shaping design of the loop antenna and the sub-reflector. When working, the system only needs to rotate the feed array and the sub-reflector to realize periodic calibration and scanning detection imaging. The mass of the rotating part of the system is greatly reduced, which is beneficial to guarantee the life of the system, which provides an effective system solution for multi-band radiation scanning detection.

The above-mentioned embodiments are only preferred specific implementations of the present invention, and general changes and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention should be 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).

Images