CN215415853U - Dynamic and nonlinear calibration device for differential reflectivity of dual-polarization weather radar - Google Patents
Dynamic and nonlinear calibration device for differential reflectivity of dual-polarization weather radar Download PDFInfo
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Abstract
The utility model provides a dynamic and nonlinear calibration device for differential reflectivity of a dual-polarization weather radar, relates to the technical field of dual-polarization weather radar calibration, and can be used for calibrating the amplitude-phase consistency of two transmitting and receiving channels of the dual-polarization weather radar and carrying out nonlinear calibration on two receiving and polarization channels of the dual-polarization weather radar. Specifically, the calibration device comprises a host, wherein a variable polarization transmitting antenna, a fixed polarization transmitting antenna, a vertical polarization receiving antenna, a horizontal polarization receiving antenna and a polarization scanning servo driving system are arranged on the host; the polarization scanning servo driving system is connected with the variable polarization transmitting antenna and is used for driving the variable polarization transmitting antenna to carry out polarization scanning according to different variable polarization angles; the polarization direction of the vertical polarization receiving antenna is vertical to the horizontal plane; the polarization direction of the horizontal polarization receiving antenna is parallel to the horizontal plane; the varying polarization angle comprises at least 45 °.
Description
Technical Field
The utility model relates to the technical field of dual-polarization weather radar calibration, in particular to a dynamic and nonlinear calibration device for differential reflectivity of a dual-polarization weather radar.
Background
More than 230 weather radars (CINRAD) of the new generation are on-line in the whole country, and play an indispensable role in national fine weather forecast service and disastrous weather monitoring and early warning. Accuracy and consistency of networking radar data directly influence radar application and benefit exertion, and especially development of a digital forecasting mode puts higher requirements on data assimilation of the networking radar. The accuracy and reliability of weather radar detection data are improved, the quality of national networking weather radar observation data is ensured, and the key points are that a perfect weather radar calibration service is established, and a technical specification and a platform for supporting the calibration service are provided.
The differential reflectivity is an important system index of the dual-polarization weather radar and is used for weather target identification. However, the conventional dual-polarization weather radar lacks a differential reflectivity parameter measurement and calibration means which can be conveniently implemented, the performance of the radar differential reflectivity is difficult to measure and evaluate when the radar is received from a factory in the production and use stages, and the difference of the differential reflectivity parameters of different radar systems is continuously found to be large in the use of users.
The measurement of the differential reflectivity is influenced by the calibration quality of the amplitude-phase consistency of the two channels of the radar transmission and reception. However, most of the existing radar amplitude-phase consistency calibration is only carried out in a machine and stands at an angle of a far-field outer loop, the differential reflectivity calibration has no practical significance, the difference of the indexes of the differential reflectivity of various types of radars is large due to the lack of the far-field outer loop calibration, the target measurement effect can only be compared in the test results of the radars under different weather conditions, and the data synchronization between the radars is difficult to realize.
In addition, the dual-polarization weather radar receives the differential reflectivity factor Z presented by the polarization vertical channel and the horizontal channel aiming at different phase state targetsdRDifferent, large dynamic range of coverage, ZdRAbout 0dB at raindrops less than 0.3mm, about 1.3dB at 1.35mm raindrops, about 1.9dB at 1.75mm raindrops, about 2.8dB at 2.65mm raindrops, about 3.3dB at 2.9mm raindrops, and about 4.1dB … … at 3.68mm raindrops. It can be seen that the nonlinearity of two receiving channels of the weather radar brings Z in different raindrop measurementsdRThe non-linear error of (2).
SUMMERY OF THE UTILITY MODEL
The utility model provides a dynamic and nonlinear calibration device for differential reflectivity of a dual-polarization weather radar, which can be used for carrying out amplitude-phase consistency calibration on two transmitting and receiving channels of a calibrated dual-polarization weather radar and carrying out nonlinear calibration on two receiving channels of the dual-polarization weather radar so as to overcome the technical problems.
In order to solve the above problems, the present invention discloses a dynamic and nonlinear calibration device for differential reflectivity of dual-polarization weather radar, comprising:
the system comprises a host, wherein a variable polarization transmitting antenna, a fixed polarization transmitting antenna, a vertical polarization receiving antenna, a horizontal polarization receiving antenna and a polarization scanning servo driving system are arranged on the host;
the polarization scanning servo driving system is connected with the variable polarization transmitting antenna and is used for driving the variable polarization transmitting antenna to carry out polarization scanning according to different variable polarization angles, and the variable polarization angles at least comprise 45 degrees;
the polarization direction of the vertical polarization receiving antenna is perpendicular to the horizontal plane, and the vertical polarization receiving antenna is connected with an H receiving branch in the host;
the polarization direction of the horizontal polarization receiving antenna is arranged in parallel to the horizontal plane, and the horizontal polarization receiving antenna is connected with a V receiving branch in the host;
wherein, the amplitude of the H receiving branch and the V receiving branch is equal and the phase difference is 0.
In an embodiment of the present invention, the method further includes:
the antenna horn bracket is positioned at the upper end of the host machine;
the fixed polarization transmitting antenna, the vertical polarization receiving antenna and the horizontal polarization receiving antenna are arranged at the top end of the antenna horn bracket side by side and are respectively connected with the antenna horn bracket;
the variable polarization transmitting antenna and the polarization scanning servo driving system are respectively positioned on two sides of the antenna horn bracket, wherein the variable polarization transmitting antenna is installed on the antenna horn bracket.
In an embodiment of the present invention, the method further includes:
the leveling support is arranged between the antenna horn support and the host machine and used for leveling the antenna horn support.
In an embodiment of the present invention, the host includes:
the simulation target calibration system comprises a shell, wherein a simulation target calibration system and a computer host are arranged on the shell;
the simulation target calibration system is connected with the variable polarization transmitting antenna and the fixed polarization transmitting antenna through two transmitting branches respectively, connected with the polarization scanning servo driving system and connected with the H receiving branch and the V receiving branch respectively;
and the computer host is connected with the simulation target calibration system.
In an embodiment of the present invention, the analog target calibration system includes a frequency synthesizer, an analog target board, a control board and a signal processing board; wherein the content of the first and second substances,
the frequency synthesizer is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch;
the simulation target board is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch;
the control panel is respectively connected with the simulation target plate and the polarization scanning servo driving system;
the signal processing board is connected with the simulation target board through an optical fiber.
In an embodiment of the present invention, the present invention further includes a horizontal bubble, where the horizontal bubble is connected to the variable polarization transmitting antenna, and the horizontal bubble is used for calibrating the variable polarization angle.
In an embodiment of the present invention, an adjustable support frame is further disposed at the lower end of the main frame, and the adjustable support frame is used for adjusting the height of the main frame.
The utility model has the following advantages:
the calibration device provided by the utility model comprises a host, wherein a variable polarization transmitting antenna, a fixed polarization transmitting antenna, a vertical polarization receiving antenna, a horizontal polarization receiving antenna and a polarization scanning servo driving system are arranged on the host; the polarization scanning servo driving system is connected with the variable polarization transmitting antenna and is used for driving the variable polarization transmitting antenna to carry out polarization scanning according to different variable polarization angles, and the variable polarization angles at least comprise 45 degrees; the polarization direction of the vertical polarization receiving antenna is perpendicular to the horizontal plane, and the vertical polarization receiving antenna is connected with an H receiving branch in the host; the polarization direction of the horizontal polarization receiving antenna is arranged in parallel to the horizontal plane, and the horizontal polarization receiving antenna is connected with a V receiving branch in the host; wherein, the amplitude of the H receiving branch and the V receiving branch is equal and the phase difference is 0. Based on the structure, the nonlinear calibration of the weather radar receiving channel can be realized by adjusting different polarization-variable angles; the variable polarization angle of the variable polarization transmitting antenna is adjusted to 45 degrees, so that a simulated target signal with the horizontal polarization and the vertical polarization equal in amplitude and the phase difference of 0 degree can be transmitted to the weather radar to be calibrated in the far field, and the amplitude-phase consistency of a weather radar receiving channel is calibrated; when the calibrated weather radar transmitting antenna is provided with dual polarization, the calibration device can respectively receive signals transmitted by the calibrated weather radar through the vertical polarization receiving antenna and the horizontal polarization receiving antenna in a far field, and can calibrate the amplitude and phase consistency of transmitting branches of the weather radar.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a prior art dual polarization weather radar;
FIG. 2 is a first schematic view of an antenna horn mount according to the present invention;
FIG. 3 is a schematic structural diagram of an antenna horn bracket according to the present invention;
FIG. 4 is a schematic structural diagram of a dynamic and nonlinear calibration apparatus for differential reflectivity of dual-polarization weather radar according to the present invention;
FIG. 5 is a schematic structural diagram of a dynamic and nonlinear calibration apparatus for differential reflectivity of dual-polarization weather radar according to the present invention;
FIG. 6 is a schematic diagram of the structure of the host of the present invention;
FIG. 7 is a block diagram of functional modules of a simulated target calibration system according to an embodiment of the utility model.
Description of reference numerals:
1-a host; 2-variable polarization transmitting antenna; 3-a fixed polarization transmit antenna; 4-a vertically polarized receive antenna; 5-a horizontally polarized receiving antenna; 6-polarization scanning servo driving system; 7-an antenna horn support; 8-a computer host; 9-an adjustable support frame; 10-leveling support.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.
Referring to fig. 1, a schematic block diagram of a dual polarization weather radar is shown. The transmitter outputs high-power detection pulses, the detection pulses are divided into two paths by a power divider, the detection pulses are sent to two circulators with vertical polarization and horizontal polarization, and then sent to two rotary joints, and the detection pulses are respectively sent to a vertical polarization feed port and a horizontal polarization feed port of an antenna dual-polarization feed source through two paths of feeders, electromagnetic wave radiation is formed in the dual-polarization feed source to a reflector, and the reflector forms wave beam radiation to space. The transmitter is divided into two transmitting branches (channels) from the power divider to the feed source, the insertion loss and the phase shift of the two transmitting branches are different, and the amplitude-phase consistency affects indexes such as differential reflectivity factors and differential propagation phase shift of the dual-polarization radar. Therefore, the amplitude-phase consistency of the transmitting branches needs to be calibrated.
Electromagnetic waves radiated to the space meet a target and are reflected back, the electromagnetic waves are focused to an antenna feed source through a reflector and received, the vertical polarization component of echoes enters a vertical polarization feed line, the horizontal polarization component enters a horizontal polarization feed line, the echoes are sent to two circulators through a rotary joint, and the echoes enter a receiver through the circulators to carry out target amplification frequency conversion filtering detection. The received echo signal is divided into two receiving branches (channels) of vertical polarization and horizontal polarization after entering from an antenna feed source and is output from a receiver, and the indexes of the dual-polarization weather radar such as differential reflectivity factor, differential propagation phase shift and the like are influenced by the consistency of the amplitudes and phases of the two receiving branches due to the fact that insertion loss phase shifts of feeder lines of the two receiving branches are different and the gains and the phase shifts of the receiver are different. Therefore, the amplitude-phase consistency of the two receiving branches needs to be calibrated.
In order to solve the above problems, the present invention provides a dynamic and nonlinear calibration apparatus for differential reflectivity of dual-polarization weather radar, comprising:
the system comprises a host 1, wherein a variable polarization transmitting antenna 2, a fixed polarization transmitting antenna 3, a vertical polarization receiving antenna 4, a horizontal polarization receiving antenna 5 and a polarization scanning servo driving system 6 are arranged on the host 1;
the polarization scanning servo driving system 6 is connected with the variable polarization transmitting antenna 2 and is used for driving the variable polarization transmitting antenna 2 to carry out polarization scanning according to different variable polarization angles, wherein the variable polarization angles at least comprise 45 degrees;
the vertical polarization receiving antenna 4 is arranged in a manner that the polarization direction is vertical to the horizontal plane, and the vertical polarization receiving antenna 4 is connected with an H receiving branch in the host 1;
the horizontal polarization receiving antenna 5 is arranged in a manner that the polarization direction is parallel to the horizontal plane, and the horizontal polarization receiving antenna 5 is connected with a V receiving branch in the host 1;
wherein, the amplitude of the H receiving branch and the V receiving branch is equal and the phase difference is 0.
The calibration device provided by the utility model belongs to a part of a calibration instrument for calibrating the dual-polarization radar, and can be used for calibrating parameters such as dynamic and nonlinear differential reflectivity of the dual-polarization radar.
The specific principle of calibrating the amplitude-phase consistency of the transmitting branch of the calibrated weather radar is as follows: the calibration device receives radar emission signals in a far field through a vertical polarization receiving antenna 4 and a horizontal polarization receiving antenna 5, wherein the vertical polarization receiving antenna 4 receives vertical polarization components in the radar emission signals and then sends the vertical polarization components to an H receiving branch in a host 1; the horizontal polarization receiving antenna 5 receives the horizontal polarization component in the radar transmitting signal and then sends the horizontal polarization component to the V receiving branch in the host 1. Because the amplitude-phase consistency of the H receiving branch and the V receiving branch of the calibrating device is calibrated in advance, namely the amplitude of the H receiving branch and the amplitude of the V receiving branch are equal and the phase difference is 0, the amplitude ratio and the phase difference of the two components can be accurately calculated by comparing the vertical polarization component output by the H receiving branch with the horizontal polarization component output by the V receiving branch, so that the amplitude calibration coefficient and the phase compensation parameter of the radar transmitting branch are obtained, and the amplitude-phase consistency of the calibrated weather radar transmitting branch can be calibrated.
The specific principle of calibrating the amplitude-phase consistency of the receiving branch of the calibrated weather radar is as follows:
after receiving the radar transmitting signals, the calibration device can generate simulated target signals in the host 1, the simulated target signals are transmitted not through a single fixed polarization transmitting antenna 3 but through a variable polarization transmitting antenna 2, and polarization scanning is realized by adjusting the variable polarization angle of the variable polarization transmitting antenna 2 through a polarization scanning servo driving system 6. The variable polarization angle of the variable polarization transmitting antenna 2 is maintained at 45 degrees, so that the variable polarization transmitting antenna 2 can radiate analog target signals with the horizontal polarization and the vertical polarization equal in amplitude and 0 degree of phase difference to the calibrated radar. The simulated target signal is received by a radar antenna feed source, the amplitude and the phase of two receiving branches can be measured at the output ends of two radar receivers by using an instrument, an amplitude calibration coefficient and a phase compensation parameter are calculated, and then the amplitude and phase consistency of the radar receiving branches is calibrated.
In addition, the utility model adjusts the variable polarization angle of the variable polarization transmitting antenna 2 through the polarization scanning servo driving system 6, the variable polarization angle carries out accurate polarization scanning within 5-88 degrees, a series of amplitude ratio true values can be generated, the radar amplitude ratio measured value is read, the calibration coefficient is calculated, an amplitude ratio calibration parameter table is established, the calibration coefficient is obtained by looking up the table during calibration, and the nonlinear calibration can be carried out on the radar receiving channel measured result.
The dual-polarization differential reflectivity calibration principle is based on polarization scanning, the phase equality between the spatial horizontal polarization component and the vertical polarization component in the scanning process can be ensured through variable polarization scanning, the amplitude is changed according to the change of the scanning angle, the parameter coverage range with larger differential reflectivity and higher parameter calibration precision can be generated, and the measurement of the dual-polarization weather radar differential reflectivity is calibrated with the measurement precision of the differential reflectivity parameter which is 3-10 times higher than that of the weather radar.
In summary, based on the above principle, under the structure and connection relationship of the calibration device protected by the present invention, the calibration of the amplitude-phase consistency of the transmitting and receiving dual channels of the calibrated dual-polarization weather radar and the nonlinear calibration of the receiving dual channels of the dual-polarization weather radar can be realized. In specific implementation, how to compare and calculate to obtain the amplitude calibration coefficient and the phase compensation parameter of the radar transmitting branch or the radar receiving branch, and how to perform the nonlinear calibration based on the true value of the amplitude ratio may refer to the related prior art, which is not the key point of the present invention and is not described herein. The present invention is only for the protection and description of the structure and connection relationship of the calibration device, and the details are described with reference to fig. 2 to 6.
Referring to fig. 2 and 3, the calibration device of the present invention further includes an antenna horn bracket 7, the antenna horn bracket 7 being located at the upper end of the main unit 1; the fixed polarization transmitting antenna 3, the vertical polarization receiving antenna 4 and the horizontal polarization receiving antenna 5 are arranged at the top end of the antenna horn bracket 7 side by side and are respectively connected with the antenna horn bracket 7; the variable polarization transmitting antenna 2 and the polarization scanning servo driving system 6 are respectively positioned at two sides of the antenna horn support 7, wherein the variable polarization transmitting antenna 2 is installed on the antenna horn support 7. The horn mouths of the variable polarization transmitting antenna 2, the fixed polarization transmitting antenna 3, the vertical polarization receiving antenna 4 and the horizontal polarization receiving antenna 5 face one side and are aligned to the calibrated radar.
In the present invention, the polarization scanning servo driving system 6 may include at least the following structure: the device comprises a servo controller, a speed reducing mechanism, a driving motor and an angle encoder; wherein, the servo controller is respectively connected with the driving motor and the angle encoder; the speed reducing mechanism is respectively connected with the driving motor and the variable polarization transmitting antenna 2; the angle encoder is connected with the speed reducing mechanism and used for limiting the rotation amplitude of the speed reducing mechanism. Above-mentioned reduction gears accessible interlock each other the action wheel with from the driving wheel realization, wherein, follow the loudspeaker end connection of driving wheel and variable polarization transmitting antenna 2, driving motor can drive from the driving wheel and the coaxial rotation of variable polarization transmitting antenna 2 through the action wheel, when setting for the variable polarization angle in servo controller, angle encoder can restrict the rotation amplitude of following the driving wheel in the reduction gears, make driven wheel rotate to the variable polarization angle of settlement, and through driving motor, reduction gears drive variable polarization transmitting antenna 2 carries out the polarization scanning under the variable polarization angle. The servo controller, the speed reducing mechanism, the driving motor and the angle encoder can be products available on the market, and the utility model is not limited in terms of specific structure and model.
In addition, referring to fig. 4 and 5, a leveling bracket 10 is further disposed between the antenna horn bracket 7 and the main unit 1, and the leveling bracket 10 is used for leveling the antenna horn bracket 7. As shown in fig. 2 and fig. 3, the leveling support 10 may include a supporting plate and a plurality of supporting legs, the supporting plate is fixed to the bottom end of the antenna horn support 7 for supporting the antenna horn support 7, the upper ends of the supporting plates are fixed to the upper ends of the supporting plates, the lower ends of the supporting plates are installed on the upper end surface of the main unit 1, and the antenna horn support 7 may be effectively leveled by adjusting the height of each supporting leg, so as to level the variable polarization transmitting antenna 2, the fixed polarization transmitting antenna 3, the vertical polarization receiving antenna 4, and the horizontal polarization receiving antenna 5. In practice, the leveling bracket 10 may include an inclination sensor, a control unit, and an adjuster, the adjuster is disposed on each of the legs, the inclination sensor detects inclination information of the antenna horn bracket 7, and the control unit controls the adjuster to operate according to the inclination information to level the antenna horn bracket 7.
In addition, the calibration device of the present invention further includes a level bubble (not shown) connected to the variable polarization transmitting antenna 2, and the level bubble is used for calibrating the variable polarization angle.
The lower extreme of host computer 1 still is provided with adjustable support frame 9, and adjustable support frame 9 is used for adjusting the height of host computer 1. As shown in fig. 2 and 3, the adjustable support frame 9 is supported by three legs, each of which is an extendable rod, and the height of the adjustable support frame can be adjusted.
As shown in fig. 4 and 5, the host 1 of the present invention includes: the simulation target calibration system comprises a shell, wherein a simulation target calibration system and a computer host 8 are arranged on the shell; the simulation target calibration system is connected with the variable polarization transmitting antenna 2 and the fixed polarization transmitting antenna 3 through two transmitting branches respectively, connected with the polarization scanning servo driving system 6 and connected with the H receiving branch and the V receiving branch respectively; the computer host 8 is connected with the simulation target calibration system.
In the utility model, each functional module of the analog target calibration system, and the functional modules on the transmitting branch, the H receiving branch and the V receiving branch are arranged in a frame shell through the CPCI mother board, so that the insertion and the extraction are convenient. The host shell is also internally provided with a power supply module which is an independent module and can be installed together with a lithium battery and a power supply control system, and the power supply control system is connected with the simulation target calibration system. Referring to fig. 6, there is shown a schematic structural diagram of the host 1 of the present invention.
The analog target calibration system can be used for calibrating the radar at least, comparing the vertical polarization component output by the H receiving branch with the horizontal polarization component output by the V receiving branch, generating an analog target signal and adjusting the variable polarization angle of the variable polarization transmitting antenna 2, and the specific implementation method can refer to the prior art. The related functional modules and their connections constituting the simulation target calibration system may be in various combinations, and the present invention is not limited herein.
Optionally, the analog target calibration system includes a frequency synthesizer, an analog target board, a control board and a signal processing board; the frequency synthesizer is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch; the simulation target board is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch; the control panel is respectively connected with the simulation target plate and the polarization scanning servo driving system 6; the signal processing board is connected with the simulation target board through an optical fiber. Referring to fig. 7, the connection relationship between the analog target calibration system and the two transmitting branches, the H receiving branch and the V receiving branch is shown. The control board is a bit control board in fig. 7, and the bit control board can be connected with the servo controller to control the polarization scanning servo driving system 6 to adjust the variable polarization angle.
In the utility model, the frequency synthesizer is mainly used for generating S, C, X waveband local oscillator signals and A/D, D/A clock signals. In fig. 7, the receiving module belongs to a part of the H receiving branch and the V receiving branch, and is mainly used for receiving radar transmission signals, performing frequency conversion, filtering and amplification, and forming intermediate frequency signals to be sent to a simulation target template for collection and processing. The simulation target board is mainly used for collecting and testing components of a vertical channel and a horizontal channel of a radar transmitting signal sent by the receiving module, modulating distance, speed, intensity and spectrum width to generate a simulation target signal, and sending the simulation target signal to the transmitting module. The transmitting module belongs to one part of two transmitting branches, and is mainly used for up-converting two paths of vertical and horizontal analog target intermediate frequency signals sent by an analog target module, generating analog target radio frequency signals, amplifying power and outputting 20w analog target signals. The signal processing board is mainly used for receiving I, Q data of the analog target board, performing FFT Doppler filtering, amplitude phase measurement, reading polarization scanning angle parameters, calculating parameters such as analog target intensity, speed, spectrum width, differential reflectivity, differential propagation phase shift and the like, and then sending the parameters into the computer host 8, and the computer host 8 can calculate and display a system error parameter table. The specific circuit structures of the frequency synthesizer, the analog target board, the control board and the signal processing board are not important in the utility model, and thus are not described herein.
Note that, the self-receiving antenna in fig. 7 indicates signals from the vertical polarization receiving antenna 4 and the horizontal polarization receiving antenna 5; and the de-transmitting antenna is used for sending the analog target signal into the variable polarization transmitting antenna 2.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, relational terms such as "first" and "second" are 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 or should not be construed as indicating or implying relative importance. 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 terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation manner of the present invention are described in this document by using specific examples, and the description of the above examples is only for assisting understanding of the present invention, and the content of the present description should not be construed as limiting the present invention. While various modifications of the illustrative embodiments and applications herein will be apparent to those skilled in the art, it is not desired to be exhaustive or exhaustive that all such modifications and variations are within the scope of the utility model.
Claims (7)
1. A dynamic and nonlinear calibration device for differential reflectivity of dual-polarization weather radar is characterized by comprising:
the device comprises a main machine (1), wherein a variable polarization transmitting antenna (2), a fixed polarization transmitting antenna (3), a vertical polarization receiving antenna (4), a horizontal polarization receiving antenna (5) and a polarization scanning servo driving system (6) are arranged on the main machine (1);
the polarization scanning servo driving system (6) is connected with the variable polarization transmitting antenna (2) and is used for driving the variable polarization transmitting antenna (2) to carry out polarization scanning according to different variable polarization angles, wherein the variable polarization angles at least comprise 45 degrees;
the polarization direction of the vertical polarization receiving antenna (4) is perpendicular to the horizontal plane, and the vertical polarization receiving antenna (4) is connected with an H receiving branch in the host (1);
the polarization direction of the horizontal polarization receiving antenna (5) is arranged in parallel to the horizontal plane, and the horizontal polarization receiving antenna (5) is connected with a V receiving branch in the host (1);
wherein, the amplitude of the H receiving branch and the V receiving branch is equal and the phase difference is 0.
2. The apparatus of claim 1, further comprising:
the antenna horn support (7), the antenna horn support (7) is located at the upper end of the main machine (1);
the fixed polarization transmitting antenna (3), the vertical polarization receiving antenna (4) and the horizontal polarization receiving antenna (5) are arranged at the top end of the antenna horn bracket (7) side by side and are respectively connected with the antenna horn bracket (7);
the variable polarization transmitting antenna (2) and the polarization scanning servo driving system (6) are respectively positioned at two sides of the antenna horn bracket (7), wherein the variable polarization transmitting antenna (2) is installed on the antenna horn bracket (7).
3. The apparatus of claim 2, further comprising:
leveling support (10), leveling support (10) set up in antenna horn support (7) with between host computer (1), be used for with antenna horn support (7) leveling.
4. The device according to claim 1, wherein the host (1) comprises:
the simulation target calibration system comprises a shell, wherein a simulation target calibration system and a computer host (8) are arranged on the shell;
the simulation target calibration system is connected with the variable polarization transmitting antenna (2) and the fixed polarization transmitting antenna (3) through two transmitting branches respectively, connected with the polarization scanning servo driving system (6) and connected with the H receiving branch and the V receiving branch respectively;
and the computer host (8) is connected with the simulation target calibration system.
5. The apparatus of claim 4, wherein the analog target calibration system comprises a frequency synthesizer, an analog target board, a control board and a signal processing board; wherein the content of the first and second substances,
the frequency synthesizer is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch;
the simulation target board is respectively connected with the two transmitting branches, the H receiving branch and the V receiving branch;
the control board is respectively connected with the simulation target board and the polarization scanning servo driving system (6);
the signal processing board is connected with the simulation target board through an optical fiber.
6. The device according to claim 1, characterized in that it further comprises a horizontal bubble connected to said variable polarization transmitting antenna (2), said horizontal bubble being used to calibrate said variable polarization angle.
7. The device according to claim 1, characterized in that the lower end of the main machine (1) is further provided with an adjustable support frame (9), and the adjustable support frame (9) is used for adjusting the height of the main machine (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397636A (en) * | 2022-03-25 | 2022-04-26 | 中国气象局气象探测中心 | Method, system and equipment for evaluating uniformity of reflectivity factor of ground-based radar |
| CN114966237A (en) * | 2022-06-16 | 2022-08-30 | 中国电子科技集团公司第五十四研究所 | Antenna far field test system based on wireless network bridge and test method thereof |
-
2021
- 2021-03-18 CN CN202120560530.7U patent/CN215415853U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397636A (en) * | 2022-03-25 | 2022-04-26 | 中国气象局气象探测中心 | Method, system and equipment for evaluating uniformity of reflectivity factor of ground-based radar |
| CN114966237A (en) * | 2022-06-16 | 2022-08-30 | 中国电子科技集团公司第五十四研究所 | Antenna far field test system based on wireless network bridge and test method thereof |
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