CN112859030A - Radar stray radiation RCS measurement system - Google Patents
Radar stray radiation RCS measurement system Download PDFInfo
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- CN112859030A CN112859030A CN202110141315.8A CN202110141315A CN112859030A CN 112859030 A CN112859030 A CN 112859030A CN 202110141315 A CN202110141315 A CN 202110141315A CN 112859030 A CN112859030 A CN 112859030A
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
- G01S7/026—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects involving the transmission of elliptically or circularly polarised waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/411—Identification of targets based on measurements of radar reflectivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The embodiment of the invention provides a radar stray radiation RCS measuring system, relating to the technical field of radar signal processing, wherein a horizontal polarization feed source is used for transmitting horizontal polarization waves; the linear polarization grid is used for transmitting the horizontal polarization wave along the horizontal direction; the compact field subsystem is used for receiving the horizontally polarized wave and converting the horizontally polarized wave into horizontally polarized quasi-plane wave for emission; the circularly polarized grating is used for modulating the horizontally polarized quasi-plane wave into circularly polarized quasi-plane wave for emission; the device is also used for modulating the circularly polarized quasi-plane wave reflected by the measured target into a vertically polarized quasi-plane wave; the compact field subsystem is also used for receiving the vertically polarized quasi-plane wave and converting the vertically polarized quasi-plane wave into a vertically polarized wave for emission; the linear polarization grid is also used for transmitting the vertical polarization wave along the vertical direction; the vertical polarization feed source is used for receiving vertical polarization waves. And carrying out RCS measurement on the measured target based on the difference between the horizontal polarized wave and the vertical polarized wave. By applying the system provided by the embodiment of the invention to measure the RCS, the accuracy of RCS measurement can be improved.
Description
Technical Field
The invention relates to the technical field of radar signal processing, in particular to a radar stray radiation RCS measuring system.
Background
Radar Cross Section (RCS) can be obtained by measuring Radar target characteristic signals, and then is used for calculating the shape, volume and posture of a measured target, and physical quantities such as electromagnetic parameters and surface roughness of surface materials, so as to identify a long-distance measured target. The radar target characteristic signal is carried on the scattering echo and is a signal generated by the interaction of electromagnetic waves emitted by a radar and a target to be detected. Wherein the scattered echoes are: the target to be measured reflects the electromagnetic wave emitted by the radar to generate a wave. The method for acquiring the radar target characteristic signal comprises theoretical calculation, compact range darkroom measurement, external field static measurement, external field dynamic measurement and the like. The compact range darkroom measurement is carried out in a microwave darkroom, spherical waves emitted by a feed source are converted into quasi-plane waves through a compact range system, when the quasi-plane waves meet a measured target in the transmission process, the measured target reflects the plane waves to generate scattering echoes, and the feed source receives the scattering echoes and obtains radar target characteristic signals based on the scattering echoes.
However, in the prior art, the feed structure in the compact range system is generally a single feed structure, and the electromagnetic wave transmitted by the feed and the received scattered echo are transmitted along the same path, so that the electromagnetic wave and the scattered echo may overlap during transmission. When the energy of the scattering echo is small, the scattering echo is easily covered by electromagnetic waves with high energy, so that the scattering echo is difficult to obtain by the feed source, and further, the obtained target characteristic signal generates deviation, so that the RCS obtained based on the target characteristic signal is low in accuracy.
Disclosure of Invention
The embodiment of the invention aims to provide a radar stray radiation RCS measuring system to improve the accuracy of RCS measurement. The specific technical scheme is as follows:
in one embodiment of an implementation of the present invention, there is provided a radar stray radiation RCS measurement system, comprising: a feed source transmit-receive isolation subsystem, a compact field subsystem, and a circularly polarized grating, the feed source transmit-receive isolation subsystem located at a focal position of the compact field subsystem, wherein:
the feed transmit receive isolation subsystem comprises: the device comprises a horizontal polarization feed source, a vertical polarization feed source and a linearly polarized grid which is obliquely arranged, wherein the horizontal polarization feed source and the vertical polarization feed source are positioned on two sides of the linearly polarized grid;
the horizontal polarization feed source is used for transmitting horizontal polarization waves;
the linear polarization grid is used for enabling the horizontally polarized wave to be transmitted along the horizontal direction;
the compact field subsystem is used for receiving the horizontally polarized wave, converting the horizontally polarized wave into a horizontally polarized quasi-plane wave and transmitting the horizontally polarized quasi-plane wave;
the circularly polarized grating is positioned in a quasi-planar dead zone range generated by quasi-planar waves emitted by the compact field subsystem and used for modulating the horizontally polarized quasi-planar waves into circularly polarized quasi-planar waves and emitting the circularly polarized quasi-planar waves; the circularly polarized quasi-planar wave is further used for modulating the circularly polarized quasi-planar wave reflected by a measured target into a vertically polarized quasi-planar wave, the measured target is positioned in the quasi-planar dead zone range, and the circularly polarized grating is far away from one side of the compact field subsystem;
the compact field subsystem is further used for receiving the vertically polarized quasi-plane wave, converting the vertically polarized quasi-plane wave into a vertically polarized wave, and transmitting the vertically polarized wave;
the linear polarization grid is also used for enabling the vertical polarized wave emitted by the compact field subsystem to be transmitted along the direction perpendicular to the emission direction of the horizontal polarized wave;
and the vertical polarization feed source is used for receiving the vertical polarization wave refracted by the linear polarization grid so as to carry out RCS measurement on the measured target based on the difference between the horizontal polarization wave and the vertical polarization wave.
In one embodiment of the invention, the horizontal polarization feed is located on a side of the linear polarization grid remote from the compact field subsystem;
the linear polarization grating is specifically used for transmitting the horizontally polarized wave so that the horizontally polarized wave is transmitted along the horizontal direction; and refracting the vertical polarized wave emitted by the compact field subsystem, so that the refracted vertical polarized wave is transmitted along the direction vertical to the emission direction of the horizontal polarized wave.
In one embodiment of the invention, the horizontal polarization feed is located on the side of the linear polarization grid near the compact field subsystem;
the linear polarization grating is specifically used for transmitting the vertical polarization wave so that the vertical polarization wave is transmitted along the horizontal direction; and refracting the horizontal polarized wave emitted by the compact field subsystem, so that the refracted horizontal polarized wave is transmitted along the direction vertical to the emission direction of the vertical polarized wave.
In an embodiment of the present invention, the feed source transceiving isolation subsystem further includes: a dielectric lens;
the dielectric lens is positioned on one side of the linear polarization grating close to the compact field subsystem and used for adjusting the beam of the horizontal polarized wave and emitting the adjusted horizontal polarized wave.
In one embodiment of the present invention, the horizontal polarization feed and the vertical polarization feed are horn waveguide antennas.
In one embodiment of the invention, the linear polarization grid is a wire grid or a grid.
In one embodiment of the invention, the circularly polarized grating comprises a plurality of dielectric grating strips which form an included angle of 45 degrees or 135 degrees with the horizontal direction;
all the dielectric grid bars are arranged according to a preset distance;
the width and the preset distance of the grid bars are determined by the frequency of the horizontally polarized quasi-planar waves.
In an embodiment of the present invention, the structure of the circularly polarized grid is a spliced structure or a multi-layer structure.
In one embodiment of the invention, the compact field subsystem is a reflective surface compact field subsystem, a holographic compact field subsystem or a lensed compact field subsystem.
In one embodiment of the invention, where the compact field subsystem is a reflective surface compact field subsystem, the compact field subsystem comprises a plurality of reflective surfaces, the reflective surfaces being: shaped reflecting mirrors or other curved mirrors.
The embodiment of the invention has the following beneficial effects:
as can be seen from the above, when the system provided by the embodiment of the present invention is applied to measure RCS, a horizontal polarization feed source in a feed source transceiving subsystem emits a horizontal polarization wave, the horizontal polarization wave is transmitted by a linear polarization grating, the horizontal polarization wave is converted into a horizontal polarization quasi-plane wave by a compact field subsystem, the horizontal polarization quasi-plane wave is modulated into a circular polarization quasi-plane wave by the circular polarization grating and then emitted outward, when the circular polarization quasi-plane wave encounters a target to be measured and is reflected, the circular polarization grating receives the circular polarization quasi-plane wave reflected by the target to be measured and modulates the circular polarization quasi-plane wave into a vertical polarization quasi-plane wave, the vertical polarization quasi-plane wave is converted into a vertical polarization wave by the compact field subsystem, and finally the vertical polarization wave is received by a vertical polarization feed source in the feed source transceiving subsystem. And performing RCS measurement on the measured object according to the difference between the horizontal polarized wave and the vertical polarized wave.
According to the embodiment of the invention, the horizontal polarized wave is transmitted by the horizontal polarized feed source and is transmitted along the horizontal direction through the linear polarized grid, and meanwhile, the vertical polarized wave transmitted by the compact field subsystem is transmitted along the direction vertical to the transmitting direction of the horizontal polarized wave through the linear polarized grid until the vertical polarized wave is received by the vertical polarized feed source. The transmission paths of the horizontal polarized waves and the vertical polarized waves are separated, the condition that waves with smaller energy are covered by waves with higher energy due to the fact that the horizontal polarized waves and the vertical polarized waves are overlapped on the transmission paths is avoided, the more accurate vertical polarized waves can be obtained, RCS measurement is conducted on a measured target based on the difference between the horizontal polarized waves and the vertical polarized waves, and the more accurate result can be obtained.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a radar stray radiation RCS measurement system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first feed source transceiving subsystem according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second feed source transceiving subsystem according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a third feed transceiving subsystem according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a circularly polarized grating according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a first compact field subsystem according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of a second compact field subsystem according to an embodiment of the present invention
FIG. 8 is a schematic diagram of a third compact field subsystem according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
When the prior art is applied to RCS measurement, the obtained target characteristic signal is easy to deviate, so that the accuracy of the RCS measured based on the target characteristic signal is low. In order to solve the technical problem, the embodiment of the invention provides a radar stray radiation RCS measuring system.
The radar stray radiation RCS measurement system provided by the embodiment of the present invention is described in detail by specific embodiments.
In an embodiment of the present invention, as shown in fig. 1, a radar stray radiation RCS measurement system provided by the embodiment of the present invention includes: a feed transmit receive isolation subsystem 101, a compact field subsystem 102, and a circularly polarized grating 103, the feed transmit isolation subsystem 101 located at a focal position of the compact field subsystem 102, wherein:
feed receive isolation subsystem 101 includes: the feed source comprises a horizontal polarization feed source 1011, a vertical polarization feed source 1012 and a linear polarization grid 1013 which is obliquely arranged, wherein the horizontal polarization feed source 1011 and the vertical polarization feed source 1012 are positioned at two sides of the linear polarization grid 1013;
a horizontally polarized feed source 1011 for transmitting horizontally polarized waves;
a linearly polarized grid 1013 for transmitting a horizontally polarized wave in a horizontal direction;
the compact field subsystem 102 is used for receiving the horizontally polarized wave, converting the horizontally polarized wave into a horizontally polarized quasi-plane wave and emitting the horizontally polarized quasi-plane wave;
the circularly polarized grating 103 is located in a quasi-planar dead zone range generated by the quasi-planar wave emitted by the compact field subsystem 102, and is used for modulating the horizontally polarized quasi-planar wave into a circularly polarized quasi-planar wave and emitting the circularly polarized quasi-planar wave; the system is also used for modulating the circularly polarized quasi-planar wave reflected by the measured object 104 into a vertically polarized quasi-planar wave, wherein the measured object 104 is positioned in the quasi-planar dead zone range, and the circularly polarized grating 103 is far away from one side of the compact field subsystem 102;
the compact field subsystem 102 is further configured to receive the vertically polarized quasi-plane wave, convert the vertically polarized quasi-plane wave into a vertically polarized wave, and emit the vertically polarized wave;
a linear polarization grid 1013 for also transmitting the vertically polarized wave emitted by the compact field subsystem 102 in a direction perpendicular to the emission direction of the horizontally polarized wave;
and a vertical polarization feed 1012 for receiving the vertical polarized wave refracted by the linear polarization grid 1013, and performing RCS measurement on the measured object 104 based on a difference between the horizontal polarized wave and the vertical polarized wave.
The focal position of the compact field subsystem 102 refers to the focal position of the curved surface of the first sub-reflecting surface in the compact field subsystem 102, that is, the focal position of the mirror surface that reflects the horizontal polarized wave emitted by the feed transceiver subsystem 101 for the first time.
In the embodiment of the present invention, the horizontal polarization feed source 1011 may emit a horizontal polarization wave outwards, and when the horizontal polarization wave is transmitted through the obliquely disposed linear polarization grid 1013, the linear polarization grid 1013 may process the horizontal polarization wave based on its own structure, and then the processed horizontal polarization wave continues to be transmitted outwards in the horizontal direction. The specific process of the linear polarization grid 1013 processing the horizontally polarized wave based on its own structure in the specific embodiment of the present invention can be seen in the following embodiments shown in fig. 2 and 3, and will not be described in detail here.
As the horizontally polarized waves pass through the compact field subsystem 102, the compact field subsystem 102 may convert the horizontally polarized waves into horizontally polarized quasi-planar waves based on the internal structure, and then the horizontally polarized quasi-planar waves continue along the transmission path. The specific internal structure of the compact field subsystem 102 in an embodiment of the present invention can be seen in the embodiment shown in the following fig. 6, and will not be described in detail here.
When the horizontally polarized quasi-planar wave passes through the circularly polarized grating 103, the circularly polarized grating 103 can modulate the horizontally polarized quasi-planar wave to obtain a circularly polarized quasi-planar wave, and then the circularly polarized quasi-planar wave continues to be transmitted outwards along a transmission path. In particular, a horizontally polarized quasi-planar wave emitted by the compact field subsystem 102 may generate a quasi-planar deadband, while the circularly polarized grating 103 may be located within the quasi-planar deadband.
In the embodiment of the present invention, the circularly polarized grating 103 may modulate the horizontally polarized quasi-planar wave according to the parameters of the horizontally polarized quasi-planar wave to obtain a left-handed or right-handed circularly polarized quasi-planar wave. Specifically, the parameters of the horizontally polarized quasi-plane wave may be an incident direction, an energy size, and the like of the horizontally polarized quasi-plane wave, which is not specifically limited in the embodiment of the present invention.
The left-handed or right-handed circularly polarized quasi-plane wave is continuously transmitted outwards along the transmission path, and when encountering the target 104, the target 104 can reflect the wave to generate a reflected wave, wherein the reflected wave can be a left-handed or right-handed circularly polarized quasi-plane wave, and the direction of the reflected wave is opposite to that of the left-handed or right-handed circularly polarized quasi-plane wave modulated by the circularly polarized grating 103.
Specifically, the target 104 may be located within a quasi-planar dead space generated by a horizontally polarized quasi-planar wave emitted by the compact field subsystem 102, while being located on a side of the circularly polarized grating 103 away from the compact field subsystem 102.
When the left-handed or right-handed circularly polarized quasi-planar wave reflected by the target 104 is transmitted through the circularly polarized grating 103, the circularly polarized grating 103 can modulate the wave to obtain a vertically polarized quasi-planar wave. Because the circularly polarized grating 103 is located within the quasi-planar dead space created by the compact field subsystem 102, the vertically polarized quasi-planar wave modulated by the circularly polarized grating 103 continues to propagate in the direction of the compact field subsystem 102.
When the vertically polarized quasi-planar wave is transmitted through the compact field subsystem 102, the compact field subsystem 102 may convert the vertically polarized quasi-planar wave into a vertically polarized wave based on the internal structure, and then the vertically polarized wave continues to be transmitted along the transmission path. The specific internal structure of the compact field subsystem 102 in an embodiment of the present invention can be seen in the embodiment shown in the following fig. 6, and will not be described in detail here.
When the vertically polarized wave passes through the linear polarization grid 1013, the linear polarization grid 1013 may process the vertically polarized wave based on its structure, so that the vertically polarized wave continues to be transmitted in a direction perpendicular to the transmission direction of the horizontally polarized wave. The specific process of the linear polarization grid 1013 for processing the vertically polarized wave based on its structure in an embodiment of the present invention can be referred to the embodiments shown in the following fig. 2 and fig. 3, and will not be described in detail here.
The vertically polarized wave after the linear polarization grating processing, which is oriented perpendicular to the transmission direction of the horizontally polarized wave, is transmitted to the vertically polarized feed source 1012 to be received. The feed transceiver subsystem 101 may perform RCS measurements on the target under test 104 based on the difference between the horizontally polarized waves transmitted by the horizontally polarized feed 1011 and the vertically polarized waves received by the vertically polarized feed 1012.
Specifically, the feed source transceiver subsystem 101 may compare the difference between the horizontally polarized wave transmitted by the horizontally polarized feed source 1011 and the vertically polarized wave received by the vertically polarized feed source 1012 through another component existing in the subsystem, so as to perform the RCS measurement on the measured object 104. That is, in this case, the feed transceiver subsystem 101 further includes a component for comparing the difference between the horizontally polarized wave and the vertically polarized wave, thereby performing RCS measurement.
In addition, the feed source transceiving subsystem 101 can also compare the difference between the horizontally polarized wave transmitted by the horizontally polarized feed source 1011 and the vertically polarized wave received by the vertically polarized feed source 1012 through an external device, so as to perform RCS measurement on the measured object 104.
In this case, the feed source transceiver subsystem 101 needs to output the horizontally polarized wave and the vertically polarized wave to the external device. The external device can be a vector network analyzer or a frequency spectrograph, and can be selected according to actual requirements, and the embodiment of the invention does not make specific requirements.
It can be seen that when the system provided by the above embodiments is used to perform RCS measurement on a target, a horizontally polarized wave is transmitted through the horizontally polarized feed 1011 of the feed transceiver subsystem 101 and is transmitted along the horizontal direction by the linear polarization grid 1013, and a vertically polarized wave transmitted by the compact field subsystem 102 is transmitted along the direction perpendicular to the transmission direction of the horizontally polarized wave by the linear polarization grid 1013 until the horizontally polarized wave is received by the vertically polarized feed 1012. The transmission paths of the transmitted horizontal polarized wave and the reflected vertical polarized wave are separated, so that the condition that the wave with smaller energy is covered by the wave with higher energy due to the overlapping of the horizontal polarized wave and the vertical polarized wave on the transmission paths is avoided, and the more accurate vertical polarized wave can be obtained. The RCS measurement of the target under test 104 is performed based on the difference between the horizontally polarized wave and the more accurate vertically polarized wave, and a more accurate result can be obtained.
In one embodiment of the present invention, as shown in fig. 2, there is provided a schematic structural diagram of a first feed transceiver subsystem 101, where the feed transceiver subsystem 101 includes: a horizontal polarization feed 1011, a vertical polarization feed 1012, and a linear polarization grid 1013, the horizontal polarization feed 1011 and the vertical polarization feed 1012 being located on either side of the linear polarization grid 1013, and the horizontal polarization feed 1011 being located on the side of the linear polarization grid 1013 away from the compact field subsystem 102, wherein:
a linear polarization grid 1013 for transmitting a horizontally polarized wave to be transmitted in a horizontal direction; the vertical polarized wave emitted by the compact field subsystem 102 is refracted so that the refracted vertical polarized wave is transmitted along a direction perpendicular to the emission direction of the horizontal polarized wave.
In the embodiment of the present invention, the horizontally polarized feed source 1011 can emit horizontally polarized waves outwards, and when the horizontally polarized waves pass through the obliquely arranged linearly polarized grid 1013, the linearly polarized grid 1013 can transmit the horizontally polarized waves, so that the horizontally polarized waves continue to be transmitted outwards in the horizontal direction. Specifically, the linear polarization grids 1013 may be placed at an inclination angle of 45 ° with respect to the horizontal direction.
In addition, the linear polarization grating 1013 can refract the vertical polarization wave transmitted by the compact field subsystem 102, so that the refracted vertical polarization wave continues to transmit in a direction perpendicular to the transmission direction of the horizontal polarization wave transmitted by the horizontal polarization feed 1011.
It can be seen that with the system provided in the above embodiment, the horizontally polarized wave emitted from the horizontally polarized feed source is transmitted through the linear polarization grid 1013 and is transmitted out in the horizontal direction, while the vertically polarized wave emitted from the compact field subsystem 102 is refracted by the linear polarization grid 1013 and is transmitted in the direction perpendicular to the emission direction of the horizontally polarized wave. The transmission paths of the transmitted horizontal polarized wave and the reflected vertical polarized wave are separated, so that the condition that the wave with smaller energy is covered by the wave with higher energy due to the fact that the horizontal polarized wave and the vertical polarized wave are overlapped on the transmission paths is avoided.
In another embodiment of the present invention, referring to fig. 3, there is provided a schematic structural diagram of a second feed transceiver subsystem, where the feed transceiver subsystem 101 includes: a vertical polarization feed 1012, a horizontal polarization feed 1011, and a linear polarization grid 1013, the vertical polarization feed 1012 and the horizontal polarization feed 1011 being located on either side of the linear polarization grid 1013, and the horizontal polarization feed 1011 being located on the side of the linear polarization grid 1013 away from the compact field subsystem 102, wherein:
a linear polarization grating 1013, specifically configured to transmit the vertically polarized wave, so that the vertically polarized wave is transmitted in a horizontal direction; and refracting the horizontal polarized wave emitted by the compact field subsystem 102, so that the refracted horizontal polarized wave is transmitted along a direction perpendicular to the emission direction of the vertical polarized wave.
In the embodiment of the present invention, the vertical polarization feed source 1012 may emit a vertical polarization wave outwards, and when the vertical polarization wave passes through the inclined linear polarization grid 1013, the linear polarization grid 1013 may transmit the vertical polarization wave, so that the vertical polarization wave continues to be transmitted outwards in the horizontal direction. Specifically, the linear polarization grids 1013 may be placed at an inclination angle of 45 ° with respect to the horizontal direction.
In addition, the linear polarization grids 1013 can refract the horizontal polarization wave transmitted by the compact field subsystem 102, so that the refracted horizontal polarization wave is transmitted along a direction perpendicular to the transmission direction of the vertical polarization wave transmitted by the vertical polarization feed 1012.
It can be seen that the system provided by the above embodiments is implemented by transmitting the vertically polarized waves emitted from the vertically polarized feed through the linear polarization grid 1013 so that they are transmitted out in the horizontal direction, while refracting the horizontally polarized waves emitted from the compact field subsystem 102 through the linear polarization grid 1013 so that they are transmitted in a direction perpendicular to the direction of emission of the vertically polarized waves. The transmission paths of the transmitted vertical polarized wave and the reflected horizontal polarized wave are separated, so that the condition that the wave with lower energy is covered by the wave with higher energy due to the fact that the horizontal polarized wave and the vertical polarized wave are overlapped on the transmission paths is avoided.
In one embodiment of the present invention, referring to fig. 4, there is provided a schematic structural diagram of a third type of feed transceiver subsystem, where the feed transceiver subsystem 101 includes: a horizontal polarization feed 1011, a vertical polarization feed 1012, a linear polarization grid 1013, and a dielectric lens 1014, wherein:
a dielectric lens 1014 is positioned on the side of the linear polarization grating 1013 near the compact field subsystem 102 for adjusting the beam of the horizontally polarized wave and emitting the adjusted horizontally polarized wave.
In the embodiment of the present invention, the horizontally polarized feed source 1011 emits the horizontally polarized wave outwards, the horizontally polarized wave continues to be transmitted outwards in the horizontal direction after being transmitted through the linear polarization grid 1013, and when passing through the dielectric lens 1014, the dielectric lens 1014 can adjust the beam of the horizontally polarized wave, so that the adjusted horizontally polarized wave continues to be transmitted outwards, and when the adjusted horizontally polarized wave passes through the compact field subsystem 102, the compact field subsystem 102 can more efficiently convert the adjusted horizontally polarized wave into the horizontally polarized quasi-plane wave.
It can be seen that, by applying the system provided in the above embodiment, the beam of the horizontally polarized wave after being transmitted through the linear polarization grid 1013 is adjusted by the dielectric lens 1014, and the adjusted horizontally polarized wave can be more efficiently converted into a horizontally polarized quasi-plane wave in the compact field subsystem 102 when passing through the compact field subsystem 102 during the process of continuing to transmit outwards, so that the transmission of the transmitted wave is more efficient and accurate.
In an embodiment of the present invention, in the system provided by the embodiments shown in fig. 1, fig. 2, and fig. 3, the horizontal polarization feed 1011 and the vertical polarization feed 1012 of the feed transceiver subsystem 101 may be horn waveguide antennas, and the linear polarization grid 1013 may be a wire grid or a grid, so that the transmission process of the transmitted wave and the reflected wave can be completed more efficiently and accurately.
In one embodiment of the present invention, referring to fig. 5, a front view and a side view of a circularly polarized grating 103 are provided, wherein the left side of fig. 5 is a front view of the circularly polarized grating 103, and the right side is a side view of the circularly polarized grating 103.
Specifically, the circularly polarized grating 103 includes a plurality of dielectric bars having an angle of 45 ° or 135 ° with the horizontal direction;
all the dielectric grid bars are arranged according to a preset distance;
the width and the preset distance of the grating are determined by the frequency of the horizontally polarized quasi-planar wave.
In the embodiment of the present invention, the circularly polarized grating 103 may be composed of a plurality of dielectric bars constructed by low-loss dielectric, having a certain width and thickness, and forming an angle of 45 ° or 135 ° with the horizontal direction, and the dielectric bars may be uniformly arranged according to a predetermined distance. The width and thickness of the dielectric barrier strips and the preset distance between the dielectric barrier strips can be determined according to the frequency of the horizontally polarized quasi-planar wave. Specifically, since the frequency of the horizontally polarized quasi-planar wave is a fixed value that can be predetermined, the width and thickness of the dielectric grid bars may be fixed values that are predetermined, and the predetermined distance between the dielectric grid bars may also be fixed values that are predetermined. When the widths and thicknesses of the dielectric gratings are the fixed values and the dielectric gratings are uniformly arranged at the preset distance, the circularly polarized grating 103 formed by the dielectric gratings can modulate the horizontally polarized quasi-planar wave into the circularly polarized quasi-planar wave.
Specifically, the width and thickness of the dielectric grid and the specific value of the preset distance between the dielectric grids may be adjusted according to the frequency of the horizontally polarized quasi-planar wave, which is not specifically limited in the embodiment of the present invention.
It can be seen that the above embodiment provides a system in which the circularly polarized grating 103 is composed of a plurality of dielectric bars constructed by low-loss dielectric, having a certain width and thickness, and forming an angle of 45 ° or 135 ° with the horizontal direction, and the dielectric bars are uniformly arranged with a predetermined distance therebetween. The circularly polarized grating 103 with the above structure can efficiently and accurately modulate the horizontally polarized quasi-plane waves transmitted by the compact field subsystem 102 into circularly polarized quasi-plane waves, and can modulate the circularly polarized quasi-plane waves reflected by the target 104 to be measured into vertically polarized quasi-plane waves, thereby obtaining more accurate reflected waves.
In an embodiment of the present invention, the structure of the circularly polarized grating 103 may be a spliced structure or a multi-layer structure, so that the modulation of the horizontally polarized quasi-plane wave and the circularly polarized quasi-plane wave can be performed better.
In one embodiment of the present invention, referring to FIG. 6, the compact field subsystem 102 is a reflective surface compact field subsystem comprising a plurality of reflective surfaces, wherein: the reflecting surface is a shaping reflecting mirror or other curved surface mirrors.
In an embodiment of the present invention, the compact field subsystem 102 is a reflective compact field subsystem, and may be composed of a multi-reflective structure, and in particular, may be composed of three reflective surfaces. When the horizontally polarized wave transmitted by the feed transceiver subsystem 101 passes through the compact field subsystem 102, the three reflecting surfaces can reflect the horizontally polarized wave three times, and when the third reflection is finished, the horizontally polarized wave can be converted into a horizontally polarized quasi-plane wave and continues to be transmitted outwards. In addition, when the vertically polarized quasi-planar wave modulated by the circularly polarized grating 103 passes through the compact field subsystem 102, the three reflecting surfaces can reflect the vertically polarized quasi-planar wave three times, obtain the vertically polarized wave, and continue to transmit outwards. In this case, the positions of the three reflecting surfaces may be such that the reflecting surface of the intermediate layer in fig. 6 can receive the horizontally polarized wave reflected by the reflecting surface of the lowermost layer, the reflecting surface of the uppermost layer can receive the horizontally polarized wave reflected by the reflecting surface of the intermediate layer, and the reflecting surface of the uppermost layer emits the horizontally polarized quasi-plane wave.
In one embodiment of the present invention, the compact field subsystem 102 is a reflective compact field subsystem, and may also be comprised of a dual reflective structure, see FIG. 7, and may be comprised of two reflective facets. When the horizontally polarized wave transmitted by the feed source transceiving subsystem 101 passes through the compact field subsystem 102, the two reflecting surfaces can reflect the horizontally polarized wave twice, and when the second reflection is finished, the horizontally polarized wave can be converted into a horizontally polarized quasi-plane wave and continues to be transmitted outwards. Besides, when the vertically polarized quasi-planar wave modulated by the circularly polarized grating 103 passes through the compact field subsystem 102, the two reflecting surfaces can reflect the vertically polarized quasi-planar wave twice, obtain the vertically polarized wave, and continue to transmit outwards. In this case, the positions of the two reflecting surfaces may satisfy the requirement that the upper reflecting surface in fig. 7 can receive the horizontally polarized wave reflected by the lower reflecting surface, and the upper reflecting surface emits the horizontally polarized quasi-plane wave outward.
In addition, the compact field subsystem 102 is a reflective compact field subsystem, and may also be comprised of a single reflective surface structure, see FIG. 8. When the horizontally polarized wave transmitted by the feed transceiver subsystem 101 passes through the compact field subsystem 102, the single reflective surface can reflect the horizontally polarized wave, so that the horizontally polarized wave can be converted into a horizontally polarized quasi-planar wave and can be transmitted outwards continuously. Besides, when the vertically polarized quasi-planar wave modulated by the circularly polarized grating 103 passes through the compact field subsystem 102, the single reflection surface can reflect the vertically polarized quasi-planar wave to obtain the vertically polarized wave, and the vertically polarized wave continues to be transmitted outwards.
Therefore, in the system provided by the above embodiment, the compact field subsystem 102 can reflect the horizontal polarized wave transmitted by the feed source transceiving subsystem 101 through its own single-reflecting surface or multi-reflecting surface structure, so as to convert the horizontal polarized wave into the horizontal polarized quasi-plane wave, and can also reflect the vertical polarized quasi-plane wave modulated by the circularly polarized grating 103, so as to convert the vertical polarized wave into the vertical polarized wave, and thus, the transmission process of the transmitted wave and the reflected wave can be completed more efficiently and accurately.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A radar stray radiation, RCS, measurement system, the system comprising: a feed source transmit-receive isolation subsystem, a compact field subsystem, and a circularly polarized grating, the feed source transmit-receive isolation subsystem located at a focal position of the compact field subsystem, wherein:
the feed transmit receive isolation subsystem comprises: the device comprises a horizontal polarization feed source, a vertical polarization feed source and a linearly polarized grid which is obliquely arranged, wherein the horizontal polarization feed source and the vertical polarization feed source are positioned on two sides of the linearly polarized grid;
the horizontal polarization feed source is used for transmitting horizontal polarization waves;
the linear polarization grid is used for enabling the horizontally polarized wave to be transmitted along the horizontal direction;
the compact field subsystem is used for receiving the horizontally polarized wave, converting the horizontally polarized wave into a horizontally polarized quasi-plane wave and transmitting the horizontally polarized quasi-plane wave;
the circularly polarized grating is positioned in a quasi-planar dead zone range generated by quasi-planar waves emitted by the compact field subsystem and used for modulating the horizontally polarized quasi-planar waves into circularly polarized quasi-planar waves and emitting the circularly polarized quasi-planar waves; the circularly polarized quasi-planar wave is further used for modulating the circularly polarized quasi-planar wave reflected by a measured target into a vertically polarized quasi-planar wave, the measured target is positioned in the quasi-planar dead zone range, and the circularly polarized grating is far away from one side of the compact field subsystem;
the compact field subsystem is further used for receiving the vertically polarized quasi-plane wave, converting the vertically polarized quasi-plane wave into a vertically polarized wave, and transmitting the vertically polarized wave;
the linear polarization grid is also used for enabling the vertical polarized wave emitted by the compact field subsystem to be transmitted along the direction perpendicular to the emission direction of the horizontal polarized wave;
and the vertical polarization feed source is used for receiving the vertical polarization wave refracted by the linear polarization grid so as to carry out RCS measurement on the measured target based on the difference between the horizontal polarization wave and the vertical polarization wave.
2. The system of claim 1, wherein the horizontal polarization feed is located on a side of the linear polarization grid away from the compact field subsystem;
the linear polarization grating is specifically used for transmitting the horizontally polarized wave so that the horizontally polarized wave is transmitted along the horizontal direction; and refracting the vertical polarized wave emitted by the compact field subsystem, so that the refracted vertical polarized wave is transmitted along the direction vertical to the emission direction of the horizontal polarized wave.
3. The system of claim 1, wherein the horizontal polarization feed is located on a side of the linear polarization grid proximate to the compact field subsystem;
the linear polarization grating is specifically used for transmitting the vertical polarization wave so that the vertical polarization wave is transmitted along the horizontal direction; and refracting the horizontal polarized wave emitted by the compact field subsystem, so that the refracted horizontal polarized wave is transmitted along the direction vertical to the emission direction of the vertical polarized wave.
4. The system of any of claims 1-3, wherein the feed transceiver isolation subsystem further comprises: a dielectric lens;
the dielectric lens is positioned on one side of the linear polarization grating close to the compact field subsystem and used for adjusting the beam of the horizontal polarized wave and emitting the adjusted horizontal polarized wave.
5. The system according to any one of claims 1-3,
the horizontal polarization feed source and the vertical polarization feed source are horn waveguide antennas.
6. The system according to any one of claims 1-3,
the linear polarization grid is a wire grid or a grid.
7. The system according to any one of claims 1-3,
the circularly polarized grating comprises a plurality of medium grating strips with an included angle of 45 degrees or 135 degrees with the horizontal direction;
all the dielectric grid bars are arranged according to a preset distance;
the width and the preset distance of the grid bars are determined by the frequency of the horizontally polarized quasi-planar waves.
8. The system of claim 7,
the structure of the circular polarization gate is a splicing structure or a multilayer structure.
9. The system according to any one of claims 1-3,
the compact field subsystem is a reflective surface compact field subsystem, a holographic compact field subsystem, or a lensed compact field subsystem.
10. The system of claim 9,
where the compact field subsystem is a reflective compact field subsystem, the compact field subsystem comprises a plurality of reflective facets, the reflective facets being: shaped reflecting mirrors or other curved mirrors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597662A (en) * | 2016-12-05 | 2017-04-26 | 上海无线电设备研究所 | Terahertz transmitting-receiving common dual-polarized quasi optical circulator |
| CN107727946A (en) * | 2017-11-08 | 2018-02-23 | 北京航空航天大学 | Tighten field device in a kind of single reflection face of high cross polarization isolation |
| CN107782694A (en) * | 2017-09-28 | 2018-03-09 | 上海无线电设备研究所 | Terahertz time-domain spectroscopy complete polarization electromagnetic scattering measuring system and acquisition methods |
| CN108051790A (en) * | 2017-12-13 | 2018-05-18 | 厦门大学 | A kind of Polarimetric Calibration method for tightening polarization ground penetrating radar system for mixing |
| US10345431B1 (en) * | 2015-06-09 | 2019-07-09 | Baron Services, Inc. | Dual polarization radar systems and methods |
| CN210347782U (en) * | 2019-07-19 | 2020-04-17 | 北京中测国宇科技有限公司 | Compact range antenna measuring system with reflecting surface positioned above quiet zone |
-
2021
- 2021-02-02 CN CN202110141315.8A patent/CN112859030B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10345431B1 (en) * | 2015-06-09 | 2019-07-09 | Baron Services, Inc. | Dual polarization radar systems and methods |
| CN106597662A (en) * | 2016-12-05 | 2017-04-26 | 上海无线电设备研究所 | Terahertz transmitting-receiving common dual-polarized quasi optical circulator |
| CN107782694A (en) * | 2017-09-28 | 2018-03-09 | 上海无线电设备研究所 | Terahertz time-domain spectroscopy complete polarization electromagnetic scattering measuring system and acquisition methods |
| CN107727946A (en) * | 2017-11-08 | 2018-02-23 | 北京航空航天大学 | Tighten field device in a kind of single reflection face of high cross polarization isolation |
| CN108051790A (en) * | 2017-12-13 | 2018-05-18 | 厦门大学 | A kind of Polarimetric Calibration method for tightening polarization ground penetrating radar system for mixing |
| CN210347782U (en) * | 2019-07-19 | 2020-04-17 | 北京中测国宇科技有限公司 | Compact range antenna measuring system with reflecting surface positioned above quiet zone |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
| CN113608175B (en) * | 2021-08-03 | 2023-09-19 | 上海无线电设备研究所 | RCS measurement receiving and transmitting system based on quantum cascade |
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