Dual-polarization phased-array antenna and meteorological radar system

Abstract

The invention discloses a dual-polarization phased-array antenna and a meteorological radar system, which can be used in the field of radars, and the dual-polarization phased-array antenna comprises a plurality of dual-polarization row-fed antennas. A plurality of dual-polarized row-fed antennas are uniformly arranged on the transverse semi-arc supporting surface in a pitching dimension; the dual-polarized row-fed antenna comprises a power divider and a plurality of dual-polarized radiation oscillators, and the plurality of dual-polarized radiation oscillators are horizontally arranged at equal intervals. The dual-polarization radiation oscillator is formed by vertically crossing two linear polarization strip line umbrella-shaped oscillators; the dual-polarization row-fed antenna is controlled in a unit gating mode so as to adjust the effective aperture of the dual-polarization phased-array antenna. Therefore, through a unit gating mode, the beam pointing angle can be synchronously changed when the scanning angle is changed, and the detection precision of the meteorological radar is improved; and on the other hand, the dual-polarized radiation oscillator in the form of the cross-symmetric dipole antenna can effectively improve the cross polarization index of the dual-polarized antenna, and the detection precision of the meteorological radar is further improved.

Description

Technical Field

[0001] The present application relates to the field of radar technology, and in particular to a dual-polarization phased array antenna and a weather radar system. Background Art

[0002] Dangerous weather such as thunderstorms, gale, heavy rainfall, hail, tornado, downburst, etc., have a great impact on social life and national economic development. Meteorological radar is an effective means to detect and warn of various types of dangerous weather. Among them, phased array meteorological radar system has become the main development direction of meteorological radar due to its advantages such as fast scanning speed and strong full airspace monitoring and detection capabilities.

[0003] At present, the commonly used phased array weather radar is usually a flat-panel phased array weather radar, which switches the antenna pointing by changing the phase of the antenna unit to achieve fast scanning. However, as the scanning angle increases, the beam pointing gain becomes smaller and smaller, and the beam width becomes larger and larger. The changing beam pointing gain and beam width lead to low detection accuracy of the weather radar.

[0004] Therefore, how to improve the detection accuracy of meteorological radar has become a problem that needs to be solved. Summary of the invention

[0005] Based on the above problems, the present application provides a dual-polarization phased array antenna and a weather radar system, which can improve the detection accuracy of the weather radar.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a dual-polarization phased array antenna, wherein the dual-polarization phased array antenna includes a plurality of dual-polarization line feed antennas;

[0008] The plurality of dual-polarized line feed antennas are evenly arranged on a transverse semicircular arc support surface in the pitch dimension;

[0009] The dual-polarization line feed antenna includes a power divider and multiple dual-polarization radiating elements, and the multiple dual-polarization radiating elements are arranged horizontally with equal intervals; the dual-polarization radiating element is composed of two linearly polarized stripline umbrella-shaped elements that are vertically crossed; the dual-polarization line feed antenna is controlled by unit selection to adjust the effective aperture of the dual-polarization phased array antenna.

[0010] Optionally, the central angle of the transverse semicircular arc support surface is 120°.

[0011] Optionally, the dual-polarization radiating element is directly fed through a stripline reverse balun.

[0012] Optionally, the feeding network of the linearly polarized stripline umbrella oscillator is located inside the substrate.

[0013] Optionally, the feeding network has isolated metalized through holes around it.

[0014] In a second aspect, an embodiment of the present application provides a weather radar system, the system comprising: a dual-polarization phased array antenna, a signal transceiver module, and a signal processing module;

[0015] The dual-polarization phased array antenna is electrically connected to the signal transceiver module; the signal transceiver module is electrically connected to the signal processing module;

[0016] The dual-polarization phased array antenna is the dual-polarization phased array antenna described in any embodiment of the first aspect, and is used to convert analog signals into electromagnetic waves for transmission, and to convert received electromagnetic waves into analog signals;

[0017] The signal transceiver module is used to drive the dual-polarization phased array antenna to transmit through an analog signal, and receive the analog signal transmitted by the dual-polarization phased array antenna, and convert the received analog signal into a digital signal;

[0018] The signal processing module is used to obtain meteorological data based on the digital signal transmitted by the signal transceiver module.

[0019] Optionally, the signal transceiver module includes a TR module;

[0020] The signal transceiver module is also used to adjust the feeding phase of the dual-polarization phased array antenna through a phase controller in the TR module connected to the dual-polarization phased array antenna to achieve a continuously changing beam pointing angle.

[0021] Optionally, the TR module is conformally arranged with the dual-polarization phased array antenna.

[0022] Optionally, the signal processing module is specifically used to:

[0023] At least one of digital beam forming, pulse compression, clutter processing and polarization parameter estimation is performed based on the sampled signal to obtain meteorological data.

[0024] Optionally, the system further comprises a servo module;

[0025] The servo module is used to drive the dual-polarization phased array antenna to rotate to a target posture so as to perform 360-degree azimuth scanning.

[0026] Compared with the prior art, this application has the following beneficial effects:

[0027] The embodiment of the present application provides a dual-polarization phased array antenna composed of dual-polarization row feed antennas arranged in circular arcs. On the one hand, the dual-polarization row feed antenna can be controlled by unit gating to adjust the effective aperture of the dual-polarization phased array antenna, so that the beam pointing angle can be changed synchronously when the scanning angle is changed, so that the changes in beam pointing gain and beam width caused by the change in scanning angle are small. The dual-polarization phased array antenna provided by the embodiment of the present application can improve the detection accuracy of the meteorological radar; on the other hand, the dual-polarization row feed antenna is composed of uniformly arranged dual-polarization radiating elements, and the dual-polarization radiating element is composed of two linearly polarized strip line umbrella-shaped elements vertically crossed. The dual-polarization radiating element in the form of a cross-symmetrical dipole antenna has a symmetrical characteristic, so that the center of the dual-polarization radiating element is a current zero point, which reduces the coupling between the radiation structures, can effectively improve the cross-polarization index of the dual-polarization antenna, and further improve the detection accuracy of the meteorological radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A structural diagram of a dual-polarization phased array antenna provided in an embodiment of the present application;

[0030] Figure 2 An antenna pattern at different scanning angles provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of feeding a linearly polarized stripline umbrella-shaped dipole provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of a conventional vibrator feeding provided in an embodiment of the present application;

[0033] Figure 5 A structural diagram of a weather radar system provided in an embodiment of the present application;

[0034] Figure 6 Another weather radar system structure diagram provided in an embodiment of the present application;

[0035] Figure 7 An amplitude window and antenna pattern obtained by using a genetic algorithm provided in an embodiment of the present application;

[0036] Figure 8 An embodiment of the present application provides an amplitude window and an antenna pattern obtained by using a Taylor window interpolation method. DETAILED DESCRIPTION

[0037] The dual-polarization phased array antenna and the weather radar system provided in the present application can be used in the radar field. The above is only an example and does not limit the application field of the dual-polarization phased array antenna and the weather radar system provided in the present application.

[0038] The terms "first", "second", "third" and "fourth" etc. in the specification, claims and drawings of this application are used to distinguish different objects rather than to limit a specific order.

[0039] In the embodiments of the present application, the words "as an example" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "as an example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "as an example" or "for example" is intended to present the relevant concepts in a specific way.

[0040] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] See also Figure 1 , which is a structural diagram of a dual-polarization phased array antenna provided in an embodiment of the present application. The dual-polarization phased array antenna includes multiple dual-polarization row feed antennas 100.

[0043] A plurality of dual-polarized line feed antennas 100 are uniformly arranged on a transverse semicircular arc support surface in a pitch dimension; the dual-polarized line feed antenna 100 comprises a power divider (not shown in the figure) and a plurality of dual-polarized radiating elements 110, and the plurality of dual-polarized radiating elements 110 are horizontally arranged at equal intervals; wherein the dual-polarized radiating element 110 is composed of two linearly polarized stripline umbrella-shaped elements vertically crossed; the dual-polarized line feed antenna 100 is controlled by a unit selection method to adjust the effective aperture of the dual-polarization phased array antenna.

[0044] A plurality of dual-polarized row-fed antennas 100 are uniformly arranged in the elevation dimension on a transverse semi-circular support surface to form a dual-polarized phased array antenna. The effective aperture of the dual-polarized phased array antenna can be controlled by means of element gating, so that different beam pointing angles can be achieved by selecting the physical effective aperture.

[0045] For example, a dual-polarized phased array antenna is composed of N dual-polarized row-fed antennas 100 arranged in an arc. The included angle between the connecting lines of two dual-polarized row-fed antennas 100 and the center of the circle is θ. By controlling the amplitude and phase of the corresponding channels through the switches in the TR module connected to the dual-polarized row-fed antennas 100, the effective aperture of the dual-polarized phased array antenna composed of specific dual-polarized row-fed antennas 100 can be selected, so that the antenna pattern points to a specific angle. As an example, if the 1st to the Mth (M < N) dual-polarized row-fed antennas 100 are selected to form the effective aperture of the dual-polarized phased array antenna, the antenna pattern points to 0 degrees; then if the 2nd to the (M + 1)th ((M + 1) < N) dual-polarized row-fed antennas 100 are selected to form the effective aperture of the dual-polarized phased array antenna, the antenna pattern points to θ degrees; if the 3rd to the (M + 2)th ((M + 2) < N) dual-polarized row-fed antennas 100 are selected to form the effective aperture of the dual-polarized phased array antenna, the antenna pattern points to 2θ degrees, and so on, the airspace range required for meteorological radar detection can be covered by the beam elevation angle. The antenna patterns at different scanning angles are as Figure 2 shown.

[0046] In a small angle range, the influence of electronic scanning on indexes such as sidelobes, gain, and cross polarization of the pattern is small. In some embodiments, to achieve more refined adjustment of the beam pointing angle, beam pointing angles of pure electronic scanning can be inserted at intervals of θ. For example, the feeding phase of the dual-polarized phased array antenna can be adjusted through the phase controller connected to the dual-polarized phased array antenna in the TR module to achieve continuously variable beam pointing angles.

[0047] Thus, when changing the scanning angle, the beam pointing angle can be synchronously changed, so that the changes in beam pointing gain and beam width caused by the change of the scanning angle are small, and the cross polarization index does not deteriorate. By using the dual-polarized phased array antenna provided by the embodiments of the present application, the detection accuracy of the meteorological radar can be improved.

[0048] In some embodiments, the central angle of the transverse semi-circular support surface is 120°. Using about 1 / 3 of the cylindrical surface with a central angle of 120° as the support surface can shorten the arc angle and reduce the number of related radar components such as dual-polarized row-fed antennas under the condition of meeting the requirements of the radar electronic scanning coverage range, thereby reducing the production cost.

[0049] In some embodiments, the power divider can be a power divider with unequal power division. By using a power divider with unequal power division, different amplitude weights can be applied to each dual-polarization radiating element 110. For example, a lower amplitude weight can be applied to the dual-polarization radiating element 110 located at the edge, and a higher amplitude weight can be applied to the dual-polarization radiating element 110 located in the center area, thereby suppressing the sidelobe level, allowing less energy to leak to unnecessary directions, reducing sidelobe interference, and improving target detection capabilities.

[0050] Optionally, the power division network may be implemented through a microstrip line, may be implemented through an air stripline, or may be implemented through a cascade of an air stripline and a microstrip line.

[0051] The dual-polarized radiation oscillator 110 is composed of two linearly polarized stripline umbrella-shaped oscillators that cross vertically, wherein the two linearly polarized stripline umbrella-shaped oscillators can be respectively Figure 1 The horizontal dipole unit 111 and the vertical dipole unit 112 are shown. Therefore, the dual-polarization radiating element 110 in the form of a cross-symmetrical dipole antenna has a symmetrical characteristic, so that the center of the dual-polarization radiating element 110 is a current zero point, which reduces the coupling between the radiation structures, can effectively improve the cross-polarization index of the dual-polarization antenna, and help the meteorological radar to more accurately measure the polarization parameters of weak precipitation targets and improve the precipitation inversion accuracy.

[0052] The center points of the dual-polarization horizontally polarized dipole unit 111 and the vertically polarized dipole unit 112 overlap, and their physical and electrical positions coincide. The synthetic beams of the horizontally polarized antenna curved array composed of the horizontally polarized dipole unit 111 and the vertically polarized antenna curved array composed of the vertically polarized dipole unit 112 have high pointing consistency and small electrical pointing deviation, which can improve the detection accuracy of the weather radar.

[0053] In addition, the power capacity of the dipole unit is relatively large. Using the dipole unit to form a dual-polarized line feed antenna can increase the transmission power of the meteorological radar using the dual-polarized line feed antenna, perform detection at a longer distance, and improve the detection effect of the meteorological radar.

[0054] Therefore, in an embodiment of the present application, a dual-polarization phased array antenna composed of dual-polarization row feed antennas arranged in circular arcs is provided. On the one hand, the dual-polarization row feed antenna can be controlled by unit gating to adjust the effective aperture of the dual-polarization phased array antenna, so that the beam pointing angle can be changed synchronously when the scanning angle is changed, so that the changes in beam pointing gain and beam width caused by the change in scanning angle are small. The dual-polarization phased array antenna provided by the embodiment of the present application can improve the detection accuracy of the meteorological radar; on the other hand, the dual-polarization radiating element is composed of two linearly polarized strip line umbrella-shaped elements vertically crossed, and the dual-polarization radiating element in the form of a cross-symmetrical dipole antenna has a symmetrical characteristic, so that the center of the dual-polarization radiating element is the current zero point, which reduces the coupling between the radiation structures, can effectively improve the cross-polarization index of the dual-polarization antenna, and further improve the detection accuracy of the meteorological radar.

[0055] See also Figure 3 , which is a schematic diagram of feeding a linear polarized stripline umbrella oscillator provided in an embodiment of the present application. The linear polarized stripline umbrella oscillator adopts balun direct feeding, and the feeding network is located in the substrate.

[0056] Compared to Figure 4 As shown in the schematic diagram of traditional dipole feeding, in the embodiment of the present application, after being combined into a dual-polarized radiating dipole, the distance between the feeding networks of the two linearly polarized stripline umbrella dipoles is relatively far, which can effectively improve the cross-polarization index of the dual-polarized antenna, reduce the mutual influence between the two linearly polarized stripline umbrella dipoles, and improve the detection accuracy of the weather radar.

[0057] In some embodiments, the feed network is surrounded by isolated metallized through holes, which wrap the feed network and cover the contact surface between the base and the plate where the umbrella antenna is located, thereby further reducing the coupling between the two feed networks and helping to improve the detection accuracy of the weather radar.

[0058] Optionally, the substrate may be a polytetrafluoroethylene double-sided copper-clad plate. Exemplarily, the dielectric constant of polytetrafluoroethylene is 3.55, and the thickness of polytetrafluoroethylene is 1.5 mm.

[0059] In some embodiments, the dual-polarized radiating element 110 is directly fed through a stripline reverse balun. The use of a stripline feeding network can significantly reduce the coupling between the feeding networks; the use of a direct feeding form isolates the radiating structure (umbrella antenna) from the feeding network, reducing the coupling between the two feeding networks and the radiating structure in the dual-polarized radiating element 110. The experimenters processed and tested the antenna based on this structure. The cross-polarization isolation of the antenna pattern is less than -35dB, and the dual-polarization beam pointing consistency is less than 0.05°, with good cross-polarization indicators and beam pointing consistency.

[0060] Optionally, in the embodiment of the present application, the dual-polarization radiating element 110 is differentially fed to ensure that the signals generated in two orthogonal directions have a desired phase relationship, maintain the radiation characteristics of the antenna, and improve its gain, directivity, polarization characteristics and other performance.

[0061] See also Figure 5 , this figure is a structural diagram of a meteorological radar system provided in an embodiment of the present application, the system comprising: a dual-polarization phased array antenna 501, a signal transceiver module 502 and a signal processing module 503.

[0062] The dual-polarization phased array antenna 501 is electrically connected to the signal transceiver module 502 ; the signal transceiver module 502 is electrically connected to the signal processing module 503 .

[0063] The dual-polarization phased array antenna 501 is the dual-polarization phased array antenna provided by any of the above embodiments, and is used to convert analog signals into electromagnetic waves for transmission, and to convert received electromagnetic waves into analog signals.

[0064] The signal transceiver module 502 is used to drive the dual-polarization phased array antenna 501 to transmit through an analog signal, and to receive the analog signal transmitted by the dual-polarization phased array antenna 501 .

[0065] As an example, the signal transceiver module 502 may include a TR module, a frequency synthesizer, an analog-to-digital converter (AD) and a digital-to-analog converter (DA); the TR module is conformally arranged with the dual-polarization phased array antenna 501 .

[0066] The frequency synthesizer and the digital-to-analog converter (DA) can provide the weather radar with a high stability, low phase noise frequency source and a modulated RF excitation signal. The DA converter is used to convert the digital baseband signal into an analog signal for subsequent up-conversion and ultimately transmission through the dual-polarization phased array antenna 501; the frequency synthesizer is used to generate the required local oscillator signal, which is used to up-convert the digital baseband signal that has been converted into an analog signal to a RF frequency to generate a transmission RF excitation signal.

[0067] Each TR module includes two horizontal polarization channels and two vertical polarization channels, wherein the horizontal polarization channel is used to process horizontal polarization signals (H coupling), and the vertical polarization channel is used to process vertical polarization signals (V coupling). When the radar is transmitting, the TR module receives the transmitting RF excitation signal (analog signal) from the frequency synthesizer, and sends it to the dual-polarization phased array antenna 501 after filtering, amplification, and amplitude and phase modulation; when the radar is receiving, the TR module receives the analog signal from the dual-polarization phased array antenna 501, and outputs the intermediate frequency analog signal after low noise amplification, filtering, and frequency conversion, and then the analog-to-digital converter (AD) in the TR module converts the intermediate frequency analog signal into a digital signal and sends it to the signal processing module 503.

[0068] Optionally, the feeding phase of the dual-polarization phased array antenna 501 can also be adjusted by a phase controller connected to the dual-polarization phased array antenna 501 in the TR module to achieve a continuously changing beam pointing angle between the angle θ between the two dual-polarization line feed antennas 100 and the center of the circle.

[0069] See also Figure 6 In some embodiments, the weather radar system further includes a calibration unit, and the TR module couples the received signal and the transmitted signal to the calibration unit, and the calibration unit performs real-time monitoring, correction, and inner and outer loop calibration on the parameters of the radar transmission signal and the received signal, and performs real-time monitoring, correction, and calibration on the amplitude and phase parameters of the radar transmission channel and the receiving channel. Thus, the calibration unit can monitor the changes in radar performance caused by environmental changes or aging based on the received radar transmission signal and the received signal, and compensate for errors by adjusting the radar system parameters, thereby maintaining a high detection accuracy.

[0070] The signal processing module 503 is used to obtain meteorological data based on the digital signal transmitted by the signal transceiver module 502.

[0071] Exemplarily, the signal processing module 503 is specifically used to perform at least one of digital beamforming (DBF, Digital Beamforming), pulse compression (Pulse Compression), clutter processing (Clutter Rejection) and polarization parameter estimation based on the digital signal transmitted by the signal transceiver module 502 to obtain meteorological data.

[0072] The signal processing module 503 can use digital signal processing technology to complete beamforming at the software level, and then can achieve gain enhancement in a specific direction and suppress interference in other directions by adjusting the phase and amplitude of the signal received by each dual-polarization radiating element, thereby optimizing the quality of the received signal in a specific direction.

[0073] The signal processing module 503 can use modulation techniques such as linear frequency modulation signals and nonlinear frequency modulation signals to transmit wide pulses, and use a matched filter at the receiving end to restore the narrow pulse width and achieve pulse compression, thereby improving the distance resolution without increasing the peak power.

[0074] The signal processing module 503 can apply technologies such as moving target indication (MTI), moving target detection (MTD), and adaptive filtering methods to remove clutter signals generated by fixed targets to reduce the impact of non-target reflections such as ground clutter on target detection.

[0075] The signal processing module 503 can analyze the echo data under different polarization modes, calculate the corresponding polarization parameters (such as differential reflectivity, differential propagation phase shift, correlation coefficient, etc.), analyze the polarization characteristics in the return signal, and then identify the target properties and states such as precipitation type.

[0076] Based on the meteorological data obtained after any one or more of the above processing, the meteorological data can be converted into visual images or charts, etc., to generate intuitive and easy-to-understand weather images or other forms of meteorological products for use by meteorological forecasters or researchers. For example, meteorological products such as reflectivity, velocity, spectrum width, differential reflectivity, differential propagation phase shift, correlation coefficient, rainfall distribution map, wind speed field, hail warning information, etc. can be generated.

[0077] In some embodiments, the weather radar system further includes an array power supply for supplying power to various modules in the weather radar system.

[0078] In some embodiments, the weather radar system further includes a servo system for driving the dual-polarization phased array antenna 501 to rotate to a target posture to perform 360-degree azimuth scanning.

[0079] As an example, a servo system may include a slip ring and a turntable, such as Figure 6 As shown, the slip ring is used to transmit the current or electrical signal from the fixed part to the rotating part, providing a stable electrical connection to ensure that the cable will not be entangled during the continuous rotation; the turntable is used to carry the dual-polarization phased array antenna 501 so that it can rotate around the axis to the target posture.

[0080] In some embodiments, the weather radar system is connected to a computer for communication, and the computer is connected to a display control center for communication, so that the staff can control the weather radar through the computer and view the detection results of the weather radar at the display control center.

[0081] Optionally, a genetic algorithm can be used to optimize the amplitude window (amplitude weighting) and phase weighting of the dual-polarization radiating element in the pitch dimension, so as to maximize the radiation power while meeting the low sidelobe requirements. Since the dual-polarization phased array antenna provided in the embodiment of the present application is composed of a plurality of dual-polarization line feed antennas 100 arranged in a circular arc in the pitch dimension, the projections of the dual-polarization radiating elements constituting the dual-polarization line feed antenna 100 will be arranged non-uniformly on the plane, compared to the conventional Taylor window non-uniform interpolation method to reduce the sidelobe level, the use of a genetic algorithm for amplitude-phase joint weighting to reduce the sidelobe is more efficient and has a greater radiation power, which can effectively increase the maximum range of the weather radar.

[0082] Under the same simulation conditions, the radiation power obtained by genetic algorithm is as follows: Figure 7 As shown, Figure 7(a) is the amplitude window obtained by genetic algorithm. Figure 7 (b) is the antenna pattern of the amplitude window obtained by genetic algorithm, the X-axis represents the angle, and the Y-axis represents the radiation power; the radiation power obtained by using the Taylor window non-uniform difference is as follows Figure 8 As shown, Figure 8 (a) is the conventional Taylor window function. Figure 8 (b) is the antenna pattern of conventional Taylor window weighting, where the X axis represents the angle and the Y axis represents the radiation power. It can be seen that the radiation power obtained by the genetic algorithm is increased by more than 10% compared with the radiation power obtained by the Taylor window interpolation method.

[0083] Exemplarily, in the embodiment of the present application, the weather radar system, computer and display control center are powered by 380V or 220V AC.

[0084] In the meteorological radar provided in the embodiment of the present application, a dual-polarization phased array antenna composed of dual-polarization row feed antennas arranged in circular arcs is adopted. On the one hand, the dual-polarization row feed antenna can be controlled by unit selection to adjust the effective aperture of the dual-polarization phased array antenna, so that the beam pointing angle can be changed synchronously when the scanning angle is changed, so that the changes in beam pointing gain and beam width caused by the change in scanning angle are small, which can improve the detection accuracy of the meteorological radar; on the other hand, the dual-polarization row feed antenna is composed of dual-polarization radiating elements, and the dual-polarization radiating elements are composed of two linearly polarized strip line umbrella-shaped elements vertically crossed, and the dual-polarization radiating elements in the form of cross-symmetrical dipole antennas have symmetrical characteristics, so that the center of the dual-polarization radiating element is the current zero point, which reduces the coupling between the radiation structures, can effectively improve the cross-polarization index of the dual-polarization antenna, and further improve the detection accuracy of the meteorological radar.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. The system embodiments described above are merely schematic, in which the units described as separate components may or may not be physically separated, and the components indicated as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A dual-polarization phased array antenna, characterized in that: The dual-polarization phased array antenna includes a plurality of dual-polarization line feed antennas; The plurality of dual-polarized line feed antennas are evenly arranged on a transverse semicircular arc support surface in the pitch dimension; The dual-polarization line feed antenna includes a power divider and multiple dual-polarization radiating elements, and the multiple dual-polarization radiating elements are arranged horizontally with equal intervals; the dual-polarization radiating element is composed of two linearly polarized stripline umbrella-shaped elements that are vertically crossed; the dual-polarization line feed antenna is controlled by unit selection to adjust the effective aperture of the dual-polarization phased array antenna.

2. The dual-polarization phased array antenna according to claim 1, characterized in that: The central angle of the transverse semicircular arc support surface is 120°.

3. The dual-polarization phased array antenna according to claim 1, characterized in that: The dual-polarization radiating element is directly fed through a stripline reverse balun.

4. The dual-polarization phased array antenna according to claim 1, characterized in that: The feeding network of the linearly polarized stripline umbrella oscillator is located in the substrate.

5. The dual-polarization phased array antenna according to claim 4, characterized in that: The feeding network is surrounded by isolated metalized through holes.

6. A weather radar system, characterized in that: The system comprises: a dual-polarization phased array antenna, a signal transceiver module and a signal processing module; The dual-polarization phased array antenna is electrically connected to the signal transceiver module; the signal transceiver module is electrically connected to the signal processing module; The dual-polarization phased array antenna is the dual-polarization phased array antenna according to any one of claims 1 to 5, and is used to convert analog signals into electromagnetic waves for transmission, and to convert received electromagnetic waves into analog signals; The signal transceiver module is used to drive the dual-polarization phased array antenna to transmit through an analog signal, and receive the analog signal transmitted by the dual-polarization phased array antenna, and convert the received analog signal into a digital signal; The signal processing module is used to obtain meteorological data based on the digital signal transmitted by the signal transceiver module.

7. The system according to claim 6, characterized in that The signal transceiver module includes a TR module; The signal transceiver module is also used to adjust the feeding phase of the dual-polarization phased array antenna through a phase controller in the TR module connected to the dual-polarization phased array antenna to achieve a continuously changing beam pointing angle.

8. The system according to claim 7, characterized in that The TR module is conformally arranged with the dual-polarization phased array antenna.

9. The system according to claim 6, characterized in that The signal processing module is specifically used for: At least one of digital beam forming, pulse compression, clutter processing and polarization parameter estimation is performed based on the sampled signal to obtain meteorological data.

10. The system according to claim 6, characterized in that The system also includes a servo module; The servo module is used to drive the dual-polarization phased array antenna to rotate to a target posture to perform 360-degree scanning.

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