CN107492720B - Satellite-borne nadir and limb integrated detection antenna feeder system and method - Google Patents
Satellite-borne nadir and limb integrated detection antenna feeder system and method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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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
- H01Q19/18—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 having two or more spaced reflecting surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0031—Parallel-plate fed arrays; Lens-fed arrays
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Abstract
The invention discloses a satellite-borne nadir and edge integrated detection antenna feed system which comprises an edge detection antenna, a nadir detection antenna, a polarization separator and a quasi-optical feed network. The adjacent edge detection antenna adopts a double-offset Cassegrain antenna and comprises a first main reverse paraboloid, an auxiliary reverse hyperboloid and a plane turning mirror; the nadir detection antenna adopts a single offset paraboloid antenna and comprises a second main inverse paraboloid, a plane catadioptric 1 mirror and a plane catadioptric 2 mirror; the plane catadioptric mirror, the plane catadioptric 1 mirror and the plane catadioptric 2 mirror are used for changing the propagation direction of the wave beam; the polarization separator is realized by adopting a polarization grid mesh and is used for selecting a horizontally polarized edge detection signal and a vertically polarized nadir detection signal; the quasi-optical feed network consists of a plurality of frequency selective surfaces, an ellipsoidal mirror, a hyperbolic mirror and a plane mirror, wherein the frequency selective surfaces are used for separating multi-channel signals, and feeding the signals to feed loudspeakers of the feed sources after the signals of each channel are folded and converged by the plane mirror, the hyperbolic mirror and the ellipsoidal mirror.
Description
Technical Field
The invention belongs to the technical field of space microwave passive remote sensing radiometers, and particularly relates to an antenna feeder system and method for simultaneously detecting a satellite-borne nadir mode and a satellite-borne edge mode.
Background
The terahertz detection technology is one of important development directions of satellite-borne remote sensors, and plays an important role in atmospheric remote sensing, ice cloud detection and the like. The method has the characteristics of wide coverage range, high precision, all weather, continuous data and the like, and is particularly suitable for researching the source and sink of trace components in the atmosphere and improving the detection precision of the atmospheric temperature and humidity profile. By combining the existing means such as microwave remote sensing, visible light, infrared and ultraviolet detection and the like, the load product can be applied to the fields such as disaster early warning, environmental protection and climate change and is an indispensable important detection means for atmospheric science research activities.
Atmospheric composition remote sensing is divided into a nadir detection mode and an edge detection mode according to different detection modes. The space coverage of the nadir detection mode is large, the nadir detection mode is mainly used for detecting the total amount distribution of the atmospheric trace gas, the vertical resolution of the edge detection mode is high, and the nadir detection mode is mainly used for detecting the layered profile of the atmospheric trace gas. At present, the existing terahertz detection instruments at home and abroad are single-mode detection instruments mostly. The celestial bottom and near-edge detection instruments play an important role in atmospheric environment monitoring, but have the defects that the detection mode is single, and the atmospheric components at the bottom layer cannot be detected due to the interference of the earth surface during near-edge detection. The detection data complementation can be realized by comprehensively utilizing the nadir detection mode and the edge detection mode, and the aim of better scientific detection can be fulfilled. Therefore, terahertz atmosphere remote sensing combining two detection modes becomes an urgent need in the field of space atmosphere remote sensing.
Disclosure of Invention
In order to meet the urgent need of multi-mode space atmospheric composition detection, the invention provides a satellite-borne nadir and limb integrated detection antenna feeder system and a method, which are used for detecting atmosphere at a certain height of the earth in the tangential direction and simultaneously detecting atmosphere at the nadir.
In order to achieve the purpose, the invention adopts the technical scheme that:
a satellite-borne nadir and limb integrated detection antenna feed system comprises a nadir detection antenna, a limb detection antenna, a polarization separator and a quasi-optical feed network;
the system comprises a polarization separator, a near edge detection antenna, a plane turning mirror and a near edge detection antenna, wherein the near edge detection antenna comprises a first main inverse paraboloid, a secondary inverse hyperboloid and the plane turning mirror and is used for collecting near edge detection signals, changing the propagation direction of wave beams through the plane turning mirror and turning and sending the signals to the polarization separator; the nadir detection antenna comprises a second main inverse paraboloid, a plane catadioptric 1 mirror and a plane catadioptric 2 mirror and is used for collecting nadir detection signals, changing the wave beam propagation direction through the plane catadioptric 1 mirror and the plane catadioptric 2 mirror and transmitting the signals to the polarization separator in a folded mode; the polarization separator is used for selecting horizontally polarized adjacent edge detection signals and vertically polarized nadir detection signals and feeding the adjacent edge detection signals and the nadir detection signals to the quasi-optical feed network; the quasi-optical feed network comprises a frequency selector, an ellipsoidal mirror, a hyperbolic mirror and a plane mirror, signals are separated according to frequency information through the frequency selector to form a network channel respectively, and the ellipsoidal mirror, the hyperbolic mirror and the plane mirror converge incident signals and feed the incident signals to feed source horns of all channels.
Preferably, the quasi-optical feed network comprises 5 frequency selectors, 6 ellipsoidal mirrors, 2 plane mirrors and 1 hyperbolic mirror, which together form 6 frequency band signal channels, and the frequency selectors with high pass and low reflection are used to sequentially separate signals of each frequency band.
Preferably, the 6 frequency band signal channels formed by the quasi-optical feed network are respectively:
polarization separator → first frequency selector → second frequency selector → first ellipsoidal mirror → first planar mirror;
polarization separator → first frequency selector → second ellipsoidal mirror;
polarization separator → first frequency selector → third frequency selector → fourth frequency selector → third ellipsoidal mirror → second planar mirror;
polarization separator → first frequency selector → third frequency selector → fifth frequency selector → sixth ellipsoidal mirror → first hyperbolic mirror;
polarization separator → first frequency selector → third frequency selector → fourth ellipsoidal mirror;
polarization separator → first frequency selector → third frequency selector → fifth ellipsoidal mirror.
Preferably, the edge detection antenna adopts a double-bias Cassegrain antenna.
Preferably, the nadir detecting antenna is a single offset parabolic antenna.
Preferably, the polarization separator adopts a polarization grid.
Preferably, the planar catadioptric 1 mirror is used to realize the required incident angle for nadir detection.
Preferably, the planar catadioptric mirror is used to achieve the required vertical scan height for edge detection.
Preferably, the secondary anti-hyperboloid is used to enlarge the focal length of the first primary anti-paraboloid to achieve an equivalent focal length of 8 times.
Preferably, after the edge detection signal and the nadir detection signal pass through the polarization separator, the focal positions of the edge detection signal and the nadir detection signal are the same.
Preferably, the edge detection signal and the nadir detection signal have the same frequency band.
Preferably, the vertical scanning axis of the edge detection signal is perpendicular to the horizontal scanning axis of the nadir detection signal.
Preferably, the incident signals of 3 frequency bands in the process of edge detection are basically the same as the incident signals detected at the bottom of the sky, the beam radiuses of different incident signals of the same frequency band at the position of a focus are the same by adjusting the focal length of the antenna, and then the propagation of two incident signals of the same frequency band and different polarizations can be realized by adopting one quasi-optical channel, so that the compact and miniaturized design of the quasi-optical feed network is facilitated.
A satellite-borne nadir and limb integrated detection method comprises the following steps:
(1) designing an adjacent edge detection antenna, adopting a double-offset Cassegrain antenna form, avoiding a secondary mirror from shielding a primary mirror, collecting an adjacent edge detection signal incident to the antenna, and ensuring sufficient equivalent focal length by adjusting the focal length of a first main reverse paraboloid and the amplification coefficient of a secondary reverse hyperboloid so as to facilitate layout and installation of a plane catadioptric mirror and a polarization separator;
(2) designing a plane catadioptric mirror, and changing the propagation direction of a wave beam so as to ensure that the first main inverse paraboloid and the auxiliary inverse hyperboloid do not generate physical shielding when the adjacent edge detection antenna scans and detects;
(3) designing a nadir detection antenna, adopting a single offset paraboloid antenna form, avoiding the shielding influence of a primary mirror, collecting nadir detection signals incident to the antenna, and adjusting the focal length of a second primary inverse paraboloid to facilitate that the focal positions of an adjacent detection antenna and the nadir detection antenna are the same after passing through a polarization separator;
(4) designing a plane catadioptric 1 mirror to ensure an incidence angle required by nadir detection; designing a plane catadioptric 2 mirror to ensure that the plane catadioptric 1 mirror and the second main inverse paraboloid do not generate shielding when the nadir detection antenna scans and detects in the circumferential direction;
(5) finely adjusting the focal lengths of the edge detection antenna and the nadir detection antenna so that two incident signals with the same frequency band and different polarizations have the same beam radius at the focal position;
(6) designing a polarization separator, wherein the polarization separator is realized by adopting a polarization grid mesh and is used for selecting a horizontally polarized edge detection signal and a vertically polarized nadir detection signal, and selecting a proper aperture of the polarization separator by adjusting the position of the polarization separator so that the edge detection antenna and the nadir detection antenna cannot be shielded in the scanning detection process;
(7) a quasi-optical feed network is designed, the inlet of the feed network is designed at the focus of the two antennas of the nadir detection antenna and the adjacent edge detection antenna, the feed network adopts 5 frequency selectors to realize the separation of six frequency bands, and each channel gathers incident signals of different channels through a hyperbolic mirror, a plane mirror and an ellipsoidal mirror and feeds the incident signals to each feed source loudspeaker.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple structure and compact layout, adopts an antenna feed mode combining dual antennas and dual-inlet multiplexing quasi-optical feed, solves the single characteristic of a detection mode, comprehensively utilizes the near-simultaneous observation of the same area of nadir detection and adjacent edge detection to realize the complementation of detection data, and can achieve the aim of better scientific observation.
Drawings
Fig. 1 is a schematic perspective view of a satellite-borne nadir and edge integrated detection antenna feed system according to an embodiment of the invention;
FIG. 2 is a schematic perspective view of a nadir probe antenna, an edge probe antenna, and a polarization separator according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of a quasi-optical feed network according to an embodiment of the present invention;
fig. 4 is a schematic plan view of a feeding network according to an embodiment of the present invention.
Description of the symbols:
MR 1-first primary inverse paraboloid;
SR-secondary hyperboloid;
PL-plane mirror reflector;
MR 2-second primary inverse paraboloid;
PL 1-plane catadioptric 1 mirror;
PL 2-plane catadioptric 2 mirror;
a P-polarization separator;
FC-antenna focus;
a Q-quasi-optical feed network;
FS1, FS2, FS3, FS4, FS 5-frequency selector;
m1, M2, M3, M4, M5, M6-ellipsoidal mirrors;
h1-hyperbolic mirror;
p1, P2-plane mirror.
Detailed Description
The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in different forms, specifications, and the like and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, relative dimensions may be exaggerated or minimized for clarity.
Referring to fig. 1 to 4, a satellite-borne nadir and edge integrated detection antenna feed system includes nadir detection antennas, edge detection antennas, polarization separators, and quasi-optical feed networks, where the nadir detection antennas and the edge detection antennas multiplex one quasi-optical feed network through the polarization separators.
The aperture of the first main reverse paraboloid is determined according to the frequency of an incident signal and the spatial resolution frequency, the focal length of the first main reverse paraboloid is determined according to the layout and installation of a polarization separator and a quasi-optical feed network, the auxiliary reverse hyperboloid is used for expanding the focal length of the first main reverse paraboloid to achieve 8 times of equivalent focal length, the plane catadioptric mirror changes the wave beam propagation direction to facilitate the compact design of an antenna structure and the design of an antenna detection scanning axis, and the relative positions among the first main reverse paraboloid, the auxiliary reverse hyperboloid and the plane catadioptric mirror can be changed according to the equivalent focal length of the first main reverse paraboloid. The first main inverse paraboloid, the secondary inverse hyperboloid and the plane reflecting mirror in the implementation are shown in figure 2 in the attached drawing of the specification.
The bottom of the sky detection antenna adopts a single offset paraboloid antenna which comprises a second main inverse paraboloid, a plane catadioptric 1 mirror and a plane catadioptric 2 mirror, wherein the focal length and the caliber of the second main inverse paraboloid are determined according to the frequency and the spatial resolution of an incident signal, the beam propagation direction is changed through the plane catadioptric 1 mirror to realize the ground detection of the second main inverse paraboloid, the beam propagation direction is changed through the plane catadioptric 2 mirror to facilitate the compact design of an antenna structure and the design of an antenna detection scanning axis, and the relative position among the second main inverse paraboloid, the plane catadioptric 1 mirror and the plane catadioptric 2 mirror can be changed along with the characteristics of the focal length, the ground incidence angle and the like of the second main inverse. In this embodiment, specific relative positions of the second main inverse paraboloid, the planar catadioptric 1 mirror and the planar catadioptric 2 mirror are shown in fig. 2 in the attached drawings of the specification.
The polarization separator is realized by adopting a polarization grid mesh and is used for selecting a horizontally polarized adjacent edge detection signal and a vertically polarized nadir detection signal and realizing that an adjacent edge detection antenna and a nadir detection antenna multiplex a quasi-optical feed network, the aperture of the polarization separator is determined according to the characteristics of the incident signal frequency, the beam radius and the like of the adjacent edge and the nadir, and the position of the polarization separator is changed according to the relative positions of the adjacent edge detection antenna, the nadir detection antenna and the quasi-optical feed network.
The quasi-optical feed network comprises a plurality of frequency selectors, an ellipsoidal mirror, a hyperbolic mirror and a plane mirror, wherein the frequency selectors are used for separating multi-channel signals, the hyperbolic mirror, the plane mirror and the ellipsoidal mirror are used for turning back and converging the channel signals and then feeding the channel signals into feed source horns, and the size of the quasi-optical feed network is determined according to the characteristics of incident signal frequency, channel number, incident signal beam radius and the like.
The sky bottom detection antenna and the edge detection antenna pass through the polarization separator, the focal positions of the two antennas are the same, the scanning axes of antenna beams are mutually vertical, and the two antennas are respectively arranged on a satellite body; the polarization separator is directly installed on the satellite star body, and the quasi-optical feed network is provided with an installation bottom plate and is installed on the satellite star body through the installation bottom plate.
Moreover, the incident signals fed into the quasi-optical feed network include 4-channel edge-adjacent probing signals and 5-channel nadir probing signals; the frequency bands of 3 groups of channels in the adjacent edge detection signals and the sky bottom detection signals are basically the same, and the wave beam radiuses of incident signals with different polarizations of adjacent frequency bands at the focal point of the antenna are basically consistent by adjusting the focal lengths of the sky bottom detection antenna and the adjacent edge detection antenna, so that the channel multiplexing of the quasi-optical feed network is facilitated; the quasi-optical feed network comprises 6 frequency band signals, and the frequency band signals are sequentially separated through a high-pass low-reverse frequency selector; the feed network comprises 5 frequency selectors, 6 ellipsoidal mirrors, 2 plane mirrors and 1 hyperbolic mirror.
In a specific implementation process, in order to realize that two antennas in two detection modes multiplex a quasi-optical feed network, a specific design method of the quasi-optical feed network comprises the following steps:
(1) designing an adjacent edge detection antenna, adopting a double-offset Cassegrain antenna form, avoiding a secondary mirror from shielding a primary mirror, collecting an adjacent edge detection signal incident to the antenna, and ensuring sufficient equivalent focal length by adjusting the focal length of a first main reverse paraboloid and the amplification coefficient of a secondary reverse hyperboloid so as to facilitate layout and installation of a plane catadioptric mirror and a polarization separator;
(2) designing a plane catadioptric mirror, and changing the propagation direction of a wave beam so as to ensure that the first main inverse paraboloid and the auxiliary inverse hyperboloid do not generate physical shielding when the adjacent edge detection antenna scans and detects;
(3) designing a nadir detection antenna, adopting a single offset paraboloid antenna form, avoiding the shielding influence of a primary mirror, collecting nadir detection signals incident to the antenna, and adjusting the focal length of a second primary inverse paraboloid to facilitate that the focal positions of an adjacent detection antenna and the nadir detection antenna are the same after passing through a polarization separator;
(4) designing a plane catadioptric 1 mirror to ensure an incidence angle required by nadir detection; designing a plane catadioptric 2 mirror to ensure that the plane catadioptric 1 mirror and the second main inverse paraboloid do not generate shielding when the nadir detection antenna scans and detects in the circumferential direction;
(5) finely adjusting the focal lengths of the edge detection antenna and the nadir detection antenna so that two incident signals with the same frequency band and different polarizations have the same beam radius at the focal position;
(6) designing a polarization separator, wherein the polarization separator is realized by adopting a polarization grid mesh and is used for selecting a horizontally polarized edge detection signal and a vertically polarized nadir detection signal, and selecting a proper aperture of the polarization separator by adjusting the position of the polarization separator so that the edge detection antenna and the nadir detection antenna cannot be shielded in the scanning detection process;
(7) a quasi-optical feed network is designed, the inlet of the feed network is designed at the focus of the two antennas of the nadir detection antenna and the adjacent edge detection antenna, the feed network adopts 5 frequency selectors to realize the separation of six frequency bands, and each channel gathers incident signals of different channels through a hyperbolic mirror, a plane mirror and an ellipsoidal mirror and feeds the incident signals to each feed source loudspeaker.
In the specific implementation, as shown in fig. 1 to 4; as shown in fig. 4, which is a schematic layout diagram, the propagation process of the adjacent detection channel 1 is as follows:
MR1→SR→PL→P→FS1→FS2→M1→P1；
the propagation process of the adjacent detection channel 2 is as follows:
MR1→SR→PL→P→FS1→FS2→M2；
the propagation process of the adjacent detection channel 3 is as follows:
MR1→SR→PL→P→FS1→FS3→FS4→M4；
the propagation process of the adjacent detection channel 4 is as follows:
MR1→SR→PL→P→FS1→FS3→FS5→M6→H1；
the propagation process of the nadir probe 1 is as follows:
MR1→SR→PL→P→FS1→FS2→M1→P1；
the propagation process of the nadir probe channel 2 is as follows:
MR2→PL1→PL2→P→FS1→FS3→FS4→M3→P2；
the propagation process of the nadir probe channel 3 is as follows:
MR2→PL1→PL2→P→FS1→FS3→FS4→M4；
the propagation process of the nadir probe channel 4 is as follows:
MR2→PL1→PL2→P→FS1→FS3→FS5→M5；
the propagation process of the nadir probe 5 is as follows:
MR2→PL1→PL2→P→FS1→FS3→FS5→M6→H1；
the edge detection channel 1 and the nadir detection channel 1 share a quasi-optical feed channel, the edge detection channel 3 and the nadir detection channel 3 share a quasi-optical feed channel, and the edge detection channel 4 and the nadir detection channel 5 share a quasi-optical feed channel.
However, the system for antenna feed for nadir and edge detection provided by the present invention is not limited to the 6-channel terahertz waveband signal provided in this embodiment, and can be applied to simultaneous detection of the multichannel satellite-borne millimeter wave, the submillimeter wave and the terahertz waveband in two detection modes by adjusting the aperture and the focal length of the antenna, the position and the size of the polarization separator, and the number of channels of the quasi-optical feed network.
In addition, the integrated detection antenna feeder system of the sky bottom and the adjacent edge not only realizes the dual-antenna and dual-inlet multiplexing quasi-optical feed network, but also is convenient for realizing the quasi-optical port surface calibration scheme of the terahertz detector.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications.
Claims (11)
1. A satellite-borne nadir and limb integrated detection antenna feed system is characterized by comprising a nadir detection antenna, a limb detection antenna, a polarization separator and a quasi-optical feed network;
the system comprises a polarization separator, a near edge detection antenna, a plane turning mirror and a near edge detection antenna, wherein the near edge detection antenna comprises a first main inverse paraboloid, a secondary inverse hyperboloid and the plane turning mirror and is used for collecting near edge detection signals, changing the propagation direction of wave beams through the plane turning mirror and turning and sending the signals to the polarization separator; the nadir detection antenna comprises a second main inverse paraboloid, a plane catadioptric 1 mirror and a plane catadioptric 2 mirror and is used for collecting nadir detection signals, changing the wave beam propagation direction through the plane catadioptric 1 mirror and the plane catadioptric 2 mirror and transmitting the signals to the polarization separator in a folded mode; the polarization separator is used for selecting horizontally polarized adjacent edge detection signals and vertically polarized nadir detection signals and feeding the adjacent edge detection signals and the nadir detection signals to the quasi-optical feed network; the quasi-optical feed network comprises 5 frequency selectors, 6 ellipsoidal mirrors, 1 hyperbolic mirror and 2 plane mirrors, and is used for separating detection signals into 6 channels and feeding the channels to feed source horns respectively.
2. The integrated detection antenna feed system of the satellite-borne nadir and limb according to claim 1, wherein the quasi-optical feed network comprises 5 frequency selectors, 6 ellipsoidal mirrors, 2 plane mirrors and 1 hyperbolic mirror, which together form 6 frequency band signal channels, and the frequency selectors with high-pass and low-reflection are used to sequentially separate the frequency band signals.
3. The system according to claim 2, wherein the 6 frequency band signal channels formed by the quasi-optical feed network are respectively:
polarization separator → first frequency selector → second frequency selector → first ellipsoidal mirror → first planar mirror;
polarization separator → first frequency selector → second ellipsoidal mirror;
polarization separator → first frequency selector → third frequency selector → fourth frequency selector → third ellipsoidal mirror → second planar mirror;
polarization separator → first frequency selector → third frequency selector → fifth frequency selector → sixth ellipsoidal mirror → first hyperbolic mirror;
polarization separator → first frequency selector → third frequency selector → fourth ellipsoidal mirror;
polarization separator → first frequency selector → third frequency selector → fifth ellipsoidal mirror.
4. The space-borne nadir and limb integrated detection antenna feed system according to claim 1, wherein the limb detection antenna is a dual-bias cassegrain antenna.
5. The integrated spaceborne nadir and edge detection antenna feed system as claimed in claim 1, wherein the nadir detection antenna is a single offset parabolic antenna.
6. The integrated spaceborne nadir and edge detection antenna feed system as claimed in claim 1, wherein the polarization separator is a polarization grid.
7. The integrated spaceborne nadir and adjacent edge detection antenna feed system as claimed in claim 1, wherein the secondary anti-hyperboloid is used to enlarge the focal length of the first primary anti-paraboloid to achieve an equivalent focal length of 8 times.
8. The system according to claim 1, wherein the focal positions of the edge detection signal and the nadir detection signal are the same after passing through the polarization separator.
9. The all-in-one spaceborne nadir and edge detection antenna feed system as claimed in claim 1, wherein the edge detection signal and the nadir detection signal have the same frequency band.
10. The system according to claim 1, wherein the vertical scanning axis of the edge detection signal is perpendicular to the horizontal detection scanning axis of the nadir detection signal.
11. A satellite-borne nadir and adjacent edge integrated detection method is characterized by comprising the following steps:
(1) designing an adjacent edge detection antenna, adopting a double-offset Cassegrain antenna form, avoiding a secondary mirror from shielding a primary mirror, collecting an adjacent edge detection signal incident to the antenna, and ensuring sufficient equivalent focal length by adjusting the focal length of a first main reverse paraboloid and the amplification coefficient of a secondary reverse hyperboloid so as to facilitate layout and installation of a plane catadioptric mirror and a polarization separator;
(2) designing a plane catadioptric mirror, and changing the propagation direction of a wave beam so as to ensure that the first main inverse paraboloid and the auxiliary inverse hyperboloid do not generate physical shielding when the adjacent edge detection antenna scans and detects;
(3) designing a nadir detection antenna, adopting a single offset paraboloid antenna form, avoiding the shielding influence of a primary mirror, collecting nadir detection signals incident to the antenna, and adjusting the focal length of a second primary inverse paraboloid to facilitate that the focal positions of an adjacent detection antenna and the nadir detection antenna are the same after passing through a polarization separator;
(4) designing a plane catadioptric 1 mirror to ensure an incidence angle required by nadir detection; designing a plane catadioptric 2 mirror to ensure that the plane catadioptric 1 mirror and the second main inverse paraboloid do not generate shielding when the nadir detection antenna scans and detects in the circumferential direction;
(5) finely adjusting the focal lengths of the edge detection antenna and the nadir detection antenna so that two incident signals with the same frequency band and different polarizations have the same beam radius at the focal position;
(6) designing a polarization separator, wherein the polarization separator is realized by adopting a polarization grid mesh and is used for selecting a horizontally polarized edge detection signal and a vertically polarized nadir detection signal, and selecting a proper aperture of the polarization separator by adjusting the position of the polarization separator so that the edge detection antenna and the nadir detection antenna cannot be shielded in the scanning detection process;
(7) a quasi-optical feed network is designed, the inlet of the feed network is designed at the focus of the two antennas of the nadir detection antenna and the adjacent edge detection antenna, the feed network adopts 5 frequency selectors to realize the separation of six frequency bands, and each channel gathers incident signals of different channels through a hyperbolic mirror, a plane mirror and an ellipsoidal mirror and feeds the incident signals to each feed source loudspeaker.
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| CN110488389A (en) * | 2019-08-27 | 2019-11-22 | 上海航天测控通信研究所 | Satellite-borne microwave Hygrothermograph integrative detection instrument |
| CN110470602A (en) * | 2019-08-27 | 2019-11-19 | 上海航天测控通信研究所 | Spaceborne Terahertz multi-angle ice cloud imager |
| CN111541031B (en) * | 2020-04-16 | 2021-08-10 | 华南理工大学 | Broadband low-profile transmission array antenna and wireless communication equipment |
| CN115441202A (en) * | 2022-08-19 | 2022-12-06 | 西安空间无线电技术研究所 | Low cross polarization quasi-optical feed network optical system |
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| CN106769884A (en) * | 2016-12-30 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | Nadir is total to light path integrated optical system with side is faced |
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