CN114171935A - Low latitude high frequency coherent scattering radar antenna system - Google Patents
Low latitude high frequency coherent scattering radar antenna system Download PDFInfo
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- CN114171935A CN114171935A CN202210078772.1A CN202210078772A CN114171935A CN 114171935 A CN114171935 A CN 114171935A CN 202210078772 A CN202210078772 A CN 202210078772A CN 114171935 A CN114171935 A CN 114171935A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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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
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
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Abstract
The invention belongs to the technical field of radars, and particularly relates to a low-latitude high-frequency coherent scattering radar antenna system, aiming at solving the problem that an antenna system with small occupied area, simple structure, low construction and operation cost and high detection signal quality is lacked in the construction of a low-latitude high-frequency coherent scattering radar. The system comprises: the radar system comprises an east main array, an east auxiliary array, a west main array, a west auxiliary array and a radar host; the east main array and the west auxiliary array and the east auxiliary array are arranged in a back-to-back parallel and spaced mode; the east-direction main array and the west-direction auxiliary array are oppositely arranged; the east antenna array and the west antenna array share a radar host; the east-west main array and the east-east auxiliary array are used for east detection; the western main array and the western auxiliary array are used for western detection; the detection mode is switched by an antenna changeover switch. The invention realizes the large-range remote detection of the ionospheric inhomogeneities in low-latitude and equatorial regions and solves the problems of large field requirement of low-latitude high-frequency radar antennas, high front-to-back ratio requirement of antenna arrays and low detection signal quality.
Description
Technical Field
The invention belongs to the technical field of radars, and particularly relates to a low-latitude high-frequency coherent scattering radar antenna system.
Background
Ionospheric inhomogeneities are plasmoids present in the ionosphere at a density significantly different from the background density. The time and space variation of the ionosphere inhomogeneity is a direct cause of the radio signal flickering after the radio signal is transmitted through the ionosphere, and the ionosphere inhomogeneity can cause the rapid random fluctuation of the amplitude, the phase and the polarization direction of the radio signal passing through the ionosphere, thereby causing the serious consequences of satellite signal fading, unlocking and the like. Therefore, the observation and research on the space-time evolution and the motion characteristics of the ionospheric inhomogeneity have very important significance for understanding the ionospheric electrodynamics process and the ionospheric scintillation phenomenon, and also have important practical application prospects.
High frequency coherent scatter radar is an important device for remote detection of ionospheric inhomogeneities. According to the Bragg scattering principle, ionospheric inhomogeneities are strongest for radio wave scattering signals in the direction perpendicular to the magnetic field lines. The high-frequency coherent scattering radar transmits radio waves perpendicular to the direction of magnetic force lines, and effective detection on the inhomogeneous body of the ionized layer can be realized.
In the polar region and the high latitude region of the earth, magnetic lines of force are close to the surface of the earth, the wave beam of the high-frequency coherent scattering radar faces the polar region of the earth (the northern hemisphere faces the north, the southern hemisphere faces the south), the narrow wave beam is used for wave beam scanning, and the ionosphere inhomogeneity in the distance range of 3000km can be detected in the azimuth sector exceeding 50 degrees. Dozens of high-frequency coherent scattering radars are built in polar regions and high latitude regions in countries around the world, and an international SuperDARN radar observation network is formed. In the low latitude and equator regions of the earth, magnetic lines of force are approximately horizontally distributed, and theoretically, radio waves are transmitted to the east or the west by using a high-frequency coherent scattering radar, so that the condition that the beam direction is vertical to the magnetic lines of force of the earth can be met, and the remote detection of the ionosphere inhomogeneity is realized. However, no low-latitude high-frequency coherent scatter radar system is built into operation in the world at present. In recent years, the construction of low latitude or equatorial high frequency coherent scatter radars has been proposed in developed western countries, usa, uk, and the like.
The low latitude area of China, particularly the south China sea and the surrounding area are important economic trade activity channels and key national defense guarantee areas of China, and the study on the ionospheric inhomogeneous body characteristics and the prediction on ionospheric scintillation in the area are very important. In order to meet the important requirements of research on low-latitude ionized layer inhomogeneities and ionosphere scintillation prediction, the high point of the international low-latitude high-frequency coherent scattering radar technology is seized, and in the project of space environment foundation monitoring network of the national fifteen-piece scientific and technological infrastructure project, China proposes to build the first world low-latitude high-frequency coherent scattering radar in Hainan island and carry out large-range and long-distance continuous detection on the ionosphere inhomogeneities in the east-west direction of the Hainan island.
At present, a low-latitude high-frequency coherent scattering radar which is not built internationally can be used for reference, and the construction of the low-latitude high-frequency coherent scattering radar in China has great challenges. If the technical framework of the high-latitude high-frequency coherent scattering radar which is the closest in technical principle is adopted, in order to meet the detection requirements of ionosphere inhomogeneities in the east and the west directions of the Hainan island, two high-frequency coherent scattering radars need to be arranged on the same station, wherein the main beam of one radar faces east, and the main beam of the other radar faces west. The whole radar system comprises an east main array, an east auxiliary array and an east host, and a west main array, a west auxiliary array and a west host. The low latitude high frequency coherent scatter radar system of this scheme has great limitation. Firstly, the observation site is in great demand, and it is very difficult to find a suitable observation site. Because the east antenna array and the west antenna array are respectively and independently arranged, the area of the whole antenna array is 2 times of that of a single high-latitude high-frequency coherent scattering radar antenna array, and a flat antenna field exceeding 50000 square meters is needed. Secondly, 2 radar main engines are needed, and 2 independent radar observation rooms are built for the radar main engines to arrange the main engines in the east direction and the west direction, so that the system composition is complex, and the construction cost and the later-stage operation management cost are high. Third, the ionospheric inhomogeneities in low latitude areas are usually drifting in the east-west direction, and the ionospheric inhomogeneities on the east side and the west side of the radar station can be detected by the forward beam and the tail lobe beam respectively, so that the signals are mixed up and cannot be distinguished. In order to suppress the radar tail lobe echo and avoid aliasing of the tail lobe echo on an inhomogeneous signal detected by a forward wave beam, a reflection net needs to be arranged behind each main array and each auxiliary array to improve the front-to-back ratio of a radar radiation directional diagram. This would greatly increase the complexity of the antenna system and the cost of building, operating and maintaining the antenna system. Namely, an antenna system with small occupied area, simple structure, high detection signal quality and low construction and operation cost is lacked in the construction of the current low-latitude high-frequency coherent scattering radar system. Based on the low latitude high frequency coherent scattering radar antenna system, the invention provides a low latitude high frequency coherent scattering radar antenna system.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that an antenna system with small floor area, simple structure, high quality of detection signals and low construction and operation cost is lacking in the construction of the existing low-latitude high-frequency coherent scattering radar, a first aspect of the present invention provides a low-latitude high-frequency coherent scattering radar antenna system, which includes: the radar system comprises an east main array, an east auxiliary array, a west main array, a west auxiliary array and a radar host;
the east main array, the east auxiliary array, the west main array and the west auxiliary array are all antenna arrays; the east main array and the west main array have the same number of antennas; the east auxiliary array and the west auxiliary array have the same number of antennas; the number of the antennas of the main array is more than that of the auxiliary array;
the east-direction main array and the west-direction main array are arranged in a back-to-parallel spaced mode, the west-direction auxiliary array and the east-direction auxiliary array are arranged in a back-to-parallel spaced mode, and the east-direction main array and the west-direction auxiliary array are arranged in an opposite mode; the east antenna array and the west antenna array share one radar host;
the east-oriented main array and the east-oriented auxiliary array are used for east-oriented detection; the western-direction main array and the western-direction auxiliary array are used for western-direction detection; during detection, the radar host switches antenna arrays for detection modes in different east and west directions through an antenna selector switch;
when detecting the east direction, the west-direction antenna array is used as a reflection net of the east-direction antenna array and used for inhibiting a tail lobe beam of a radio wave synthesized by the east-direction antenna array; when detecting the west direction, the east antenna array is used as a reflection net of the west antenna array for suppressing the tail lobe beam of the radio wave synthesized by the west antenna array.
In some preferred embodiments, the antenna channels of the east main array and the west main array are transmit-receive multiplexing antenna channels, transmit and receive are controlled by a transmit-receive switch, each antenna channel includes two antennas, which are a west transmit-receive antenna and an east transmit-receive antenna, and the antennas are switched by the antenna switch when the radar detects different directions.
In some preferred embodiments, the antenna channels of the west-oriented auxiliary array and the east-oriented auxiliary array are receiving antenna channels, each antenna channel includes two antennas, namely a west-oriented receiving antenna and an east-oriented receiving antenna, and the antennas are switched by the antenna switch when the radar detects different directions.
In some preferred embodiments, the antenna is made of a metal material, including aluminum alloy tube, stainless steel tube.
In some preferred embodiments, the transmit-receive multiplexing antenna channels employ a digital phase shifting technique when transmitting and receiving radar signals or when the receive antenna channels receive radar signals.
In some preferred embodiments, during east detection, the east transmitting and receiving antenna and the east receiving antenna are turned on by the antenna switch to form an east transmitting and receiving array and an east receiving array; forming an east-west short baseline by an east-direction receiving array and an east-direction transmitting and receiving array, and then resolving a pitch angle of an ionosphere radio echo by an interference method;
when in western-direction detection, the western-direction transmitting and receiving antenna and the western-direction receiving antenna are conducted through the antenna switch to form a western-direction transmitting and receiving array and a western-direction receiving array; and forming a short base line in the east-west direction by the west-direction receiving array and the west-direction transmitting and receiving array, and further resolving the pitch angle of the ionosphere radio echo by an interferometry.
The invention has the beneficial effects that:
the invention realizes the large-scale remote detection of the ionospheric inhomogeneities in low-latitude and equatorial regions, and solves the problems of huge requirements on low-latitude high-frequency radar antenna fields, high requirements on the front-to-back ratio of the antenna array and low quality of detected signals.
1) The east main array and the west main array are arranged in a back mode, and the west auxiliary array and the east auxiliary array are arranged in a back mode, so that the width of one auxiliary array is increased on the basis of one set of unidirectional radar antenna array, and the field area can be greatly reduced compared with a scheme of using 2 sets of independent antenna arrays;
2) because the east-oriented antenna array and the west-oriented antenna array are arranged in a back-to-back manner, and the two sets of antenna systems share one radar host, only one radar observation room needs to be built, the equipment complexity is greatly reduced, and the construction and operation costs are reduced;
3) because the east antenna array and the west antenna array are arranged in a back direction, when the antenna is detected towards the west direction, the east antenna is actually equivalent to a reflective net of the west antenna, and when the antenna is detected towards the east direction, the west antenna is actually equivalent to the reflective net of the east antenna, so that the front-to-back ratio of a radiation directional diagram of the unidirectional antenna can be greatly improved, the interference of tail lobe echoes on forward echoes is inhibited, and the data quality is improved;
4) in order to solve the problem that the antennas in the two directions of the east and the west share one radar, an antenna change-over switch is adopted at the lower end of each antenna, the antennas are switched to the east direction during the east direction detection mode, the antennas are switched to the west direction during the west direction detection mode, and the detection convenience is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.
FIG. 1 is a block diagram of a low latitude, high frequency coherent scatter radar antenna system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific structure of a low-latitude high-frequency coherent scattering radar antenna system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a West sounding process according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of an east detection process of one embodiment of the present invention;
FIG. 5 is a schematic diagram of a front-to-back ratio of a single Western-wise transmit receive antenna according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of a front-to-back ratio of an east antenna mirrored behind a west transmit receive antenna in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram of alternate detection by the control and acquisition system in accordance with one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages 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 accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The invention relates to a low latitude high frequency coherent scattering radar antenna system, comprising: the radar system comprises an east main array, an east auxiliary array, a west main array, a west auxiliary array and a radar host;
the east main array, the east auxiliary array, the west main array and the west auxiliary array are all antenna arrays; the east main array and the west main array have the same number of antennas; the east auxiliary array and the west auxiliary array have the same number of antennas; the number of the antennas of the main array is more than that of the auxiliary array;
the east-direction main array and the west-direction main array are arranged in a back-to-parallel spaced mode, the west-direction auxiliary array and the east-direction auxiliary array are arranged in a back-to-parallel spaced mode, and the east-direction main array and the west-direction auxiliary array are arranged in an opposite mode; the east antenna array and the west antenna array share one radar host;
the east-oriented main array and the east-oriented auxiliary array are used for east-oriented detection; the western-direction main array and the western-direction auxiliary array are used for western-direction detection; during detection, the radar host switches antenna arrays for detection modes in different east and west directions through an antenna selector switch;
when detecting the east direction, the west-direction antenna array is used as a reflection net of the east-direction antenna array and used for inhibiting a tail lobe beam of a radio wave synthesized by the east-direction antenna array; when detecting the west direction, the east antenna array is used as a reflection net of the west antenna array for suppressing a tail lobe beam of a radio wave synthesized by the east antenna array.
In order to more clearly explain the low-latitude high-frequency coherent scattering radar antenna system of the present invention, the following describes each module in an embodiment of the method in detail with reference to the accompanying drawings.
The invention provides a low-latitude high-frequency coherent scattering radar antenna system which adopts a radar host and two radar antennas and can realize large-range remote detection on ionospheric inhomogeneities in low-latitude and equatorial regions. The requirements of huge low-latitude high-frequency radar antenna field requirements, high antenna array front-to-back ratio requirements and the like are met. The method comprises the following specific steps:
the low-latitude high-frequency coherent scattering radar antenna system comprises an east main array, an east auxiliary array, a west main array, a west auxiliary array and 1 radar host. As shown in fig. 1, the master in fig. 1 is a radar master.
The east main array, the east auxiliary array, the west main array and the west auxiliary array are all antenna arrays; the numbers of the antennas of the east main array and the west main array are the same; the numbers of antennas of the east auxiliary array and the west auxiliary array are the same; the number of antennas of the main array is more than that of the auxiliary array. In this embodiment, the main array is preferably composed of 16 antennas, and the longitudinal distance between the antennas of the same main array is 15m, that is, the longitudinal lengths of the east main array and the west main array are both 240 m. The auxiliary array is composed of 4 antennas, the longitudinal distance between the antennas is also 15m, the transverse distance between the east main array and the west main array is 15m, and the transverse distance between the east auxiliary array and the west auxiliary array is also 15 m. The transverse distance between the east auxiliary array and the west main array is 140 m.
The east-direction main array and the west-direction main array are arranged back to back (specifically arranged at intervals in a back-to-back parallel mode), the west-direction auxiliary array and the east-direction auxiliary array are arranged back to back (specifically arranged at intervals in a back-to-back parallel mode), and the east-direction main array and the west-direction auxiliary array are arranged oppositely (preferably, the auxiliary array corresponds to the middle of the main array, and can be vertically offset according to the antenna field condition in other embodiments). The area of the field can be greatly reduced, and only 33600 square meters is needed. Because the east-oriented antenna arrays and the west-oriented antenna arrays are adjacently arranged back to back, and the two sets of antenna systems share one radar host, only one radar observation room needs to be built, the equipment complexity is greatly reduced, and the construction and operation cost is reduced.
The east main array and the east auxiliary array are used in an east detection mode, and the west main array and the west auxiliary array are used in a west detection mode. The east antenna array and the west antenna array share one radar host, and detection modes for different directions are switched through an antenna selector switch.
The antenna channels of the east main array and the west main array are transmitting and receiving multiplexing antenna channels, each antenna channel comprises two antennas, namely a west transmitting and receiving antenna and an east transmitting and receiving antenna, and the antennas are switched by the antenna switch (namely the antenna switch in fig. 2) when the radar detects different directions. The antenna channels of the west auxiliary array and the east auxiliary array are receiving antenna channels, each antenna channel comprises two antennas, namely a west receiving antenna and an east receiving antenna, and the antennas are switched by the antenna selector switch when the radar detects different directions. The method specifically comprises the following steps: the antenna change-over switch is automatically and alternately controlled by a radar control and acquisition system, namely alternate detection of an east detection mode and a west detection mode is realized according to a time sequence, and as shown in fig. 7, large-range and long-distance continuous detection can be carried out on ionosphere inhomogeneities in east and west directions in a low latitude area.
As shown in fig. 2, the transmit-receive multiplexing antenna channel preferably includes channel 1-channel 16, and the receive antenna channel includes channel 17-channel 20, where channels 1-16 can be used for both transmission and reception, and the transmission and reception are controlled by a transmit-receive switch. Channels 17-20 are for receiving only.
In the western direction detection, as shown in fig. 3, the specific process is as follows:
in the west detection mode, the antenna switch 1-16 turns on the west transmitting and receiving antenna 1-16 (meanwhile, the east transmitting and receiving antenna 1-16 is turned off), 16 west transmitting and receiving antennas form a west transmitting and receiving array, the antenna switch 17-20 turns on the west receiving antenna 17-20 (simultaneously, the east receiving antenna 17-20 is turned off), and 4 receiving antennas form a west receiving array. Because the antenna is made of metal materials, such as an aluminum alloy pipe or a stainless steel pipe, the broken east transmitting and receiving antenna is equivalent to a reflecting net arranged behind the west transmitting and receiving array, and the effect is that when the west is detected, the tail lobe of radio waves, namely tail lobe beams of the radio waves synthesized by the west antenna array, can be greatly inhibited.
The simulation verification effect is shown in fig. 5 and 6. The front-to-back ratio of the east single transmitting and receiving antenna is 14.9dB, if a west antenna is arranged behind the east transmitting and receiving antenna in a mirror image mode, the front-to-back ratio of the east single transmitting and receiving antenna can reach 31dB, echoes detected by tail lobe radio wave signals can be greatly restrained during east detection, and echo confusion is avoided. Therefore, the front-to-back ratio of the radiation directional diagram of the unidirectional antenna can be greatly improved, the interference of tail lobe echo on the forward echo is inhibited, and the data quality is improved.
The 16 transmitting and receiving antennas form a beam with a narrower azimuth direction, so that higher gain is obtained, and long-distance detection can be realized. However, the antenna array has wider pitching wave beams, and a west receiving array and a west transmitting and receiving array form a short base line in the east-west direction, so that the pitching angle of ionosphere radio echo can be solved by an interferometry. Meanwhile, due to the adoption of a digital phase shifting technology during the transmission and the reception of signals, the wide-range beam scanning in the azimuth direction can be realized, and the wide-range and long-distance ionospheric inhomogeneity detection can be realized.
In the east direction detection, as shown in fig. 4, the specific process is as follows:
in the east detection mode, the antenna switch 1-16 turns on the east transmitting and receiving antenna 1-16 (meanwhile, the west transmitting and receiving antenna 1-16 is turned off), 16 transmitting and receiving antennas form an east transmitting and receiving array, the antenna switch 17-20 turns on the east receiving antenna 17-20 (simultaneously, the west receiving antenna 17-20 is turned off), and 4 receiving antennas form an east receiving array. The split west transmitting and receiving antenna is equivalent to a reflecting net arranged behind an east transmitting and receiving array, and the effect is that during east detection, the tail lobe of radio waves, namely tail lobe beams of the radio waves synthesized by the east antenna array, can be greatly inhibited. Because the antenna array has wider pitching wave beams, an east-west short base line is formed by an east-direction receiving array and an east-direction transmitting and receiving array, and the pitching angle of ionosphere radio echo can be solved by an interference method. Different from the west detection mode, in the east detection mode, the east receiving array is in front of the east transmitting and receiving array, and the relative coordinates in the process of resolving the pitching angle of the ionospheric radio echo by the interferometry are different from the west detection mode.
It should be noted that, the low-latitude and high-frequency coherent scattering radar antenna system provided in the foregoing embodiment is only illustrated by the division of the above functional modules, and in practical applications, the above functions may be allocated to different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the above described functions. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
Those skilled in the art will appreciate that the various illustrative modules described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that software modules, routines corresponding to the method steps, may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (6)
1. A low latitude, high frequency coherent scatter radar antenna system, comprising: the radar system comprises an east main array, an east auxiliary array, a west main array, a west auxiliary array and a radar host;
the east main array, the east auxiliary array, the west main array and the west auxiliary array are all antenna arrays; the east main array and the west main array have the same number of antennas; the east auxiliary array and the west auxiliary array have the same number of antennas; the number of the antennas of the main array is more than that of the auxiliary array;
the east-direction main array and the west-direction main array are arranged in a back-to-parallel spaced mode, the west-direction auxiliary array and the east-direction auxiliary array are arranged in a back-to-parallel spaced mode, and the east-direction main array and the west-direction auxiliary array are arranged in an opposite mode; the east antenna array and the west antenna array share one radar host;
the east-oriented main array and the east-oriented auxiliary array are used for east-oriented detection; the western-direction main array and the western-direction auxiliary array are used for western-direction detection; during detection, the radar host switches antenna arrays for detection modes in different east and west directions through an antenna selector switch;
when detecting the east direction, the west-direction antenna array is used as a reflection net of the east-direction antenna array and used for inhibiting a tail lobe beam of a radio wave synthesized by the east-direction antenna array; when detecting the west direction, the east antenna array is used as a reflection net of the west antenna array for suppressing the tail lobe beam of the radio wave synthesized by the west antenna array.
2. The low latitude high frequency coherent scatter radar antenna system according to claim 1, characterized in that the antenna channels of the east and west main arrays are transmit-receive multiplexing antenna channels, transmit and receive are controlled by a transmit-receive switch, each antenna channel comprises two antennas, respectively a west transmit-receive antenna and an east transmit-receive antenna, and switching is performed by the antenna switch when radar detects different directions.
3. The low latitude high frequency coherent scatter radar antenna system according to claim 2, characterized in that the antenna channels of the west and east auxiliary arrays are receiving antenna channels, each antenna channel comprises two antennas, respectively a west receiving antenna and an east receiving antenna, and switching is performed by the antenna selector switch when radar detects different directions.
4. The low latitude high frequency coherent scatter radar antenna system according to claim 3, characterized in that the antenna is made based on metallic materials, including aluminum alloy tubes, stainless steel tubes.
5. The low latitude high frequency coherent scatter radar antenna system according to claim 4, characterized in that the transmit receive multiplex antenna channel employs a digital phase shifting technique when transmitting and receiving radar signals or when the receive antenna channel receives radar signals.
6. The low latitude high frequency coherent scatter radar antenna system according to claim 3, characterized in that, during east detection, an east transmit-receive antenna and an east receive antenna are turned on by the antenna switch to form an east transmit-receive array and an east receive array; forming an east-west short baseline by an east-direction receiving array and an east-direction transmitting and receiving array, and then resolving a pitch angle of an ionosphere radio echo by an interference method;
when in western-direction detection, the western-direction transmitting and receiving antenna and the western-direction receiving antenna are conducted through the antenna switch to form a western-direction transmitting and receiving array and a western-direction receiving array; and forming a short base line in the east-west direction by the west-direction receiving array and the west-direction transmitting and receiving array, and further resolving the pitch angle of the ionosphere radio echo by an interferometry.
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| CN114171935B (en) | 2022-04-19 |
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