CN114400430A - Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application - Google Patents
Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application Download PDFInfo
- Publication number
- CN114400430A CN114400430A CN202210034076.0A CN202210034076A CN114400430A CN 114400430 A CN114400430 A CN 114400430A CN 202210034076 A CN202210034076 A CN 202210034076A CN 114400430 A CN114400430 A CN 114400430A
- Authority
- CN
- China
- Prior art keywords
- channel
- antenna
- radar
- parameter
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 230000001976 improved effect Effects 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims 1
- 230000005622 photoelectricity Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 9
- 230000010287 polarization Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 7
- 239000000306 component Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000010365 information processing Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010399 three-hybrid screening Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention belongs to the technical field of electronic information, and discloses a transceiver antenna integrated short feeder multi-parameter multi-channel weather radar and application thereof.A rotating platform is arranged at the upper end of an antenna base, a signal case is arranged at the left end of the rotating platform, and an auxiliary case is arranged at the right end of the rotating platform; the signal case is internally provided with a frequency synthesizer and a digital signal processor, and the frequency synthesizer passes through a local oscillator VloThe N-channel analog receiving front end is connected with the N-channel analog receiving front end; frequency synthesizer and emission waveform generatorConnected, transmitting waveform generators passing a transmit signal VTXThe digital signal processor is connected with the N-channel transmitter through a trigger Tr signal; the N-channel transmitter is connected with the first circulator through a first transmitting channel. The invention ensures the excellent amplitude-phase performance of multi-parameter measurement, greatly reduces the influence of noise, attenuation, amplitude-phase distortion and the like introduced by an analog transmission channel, and realizes the accurate measurement of the radar on the multi-parameter of the meteorological target.
Description
Technical Field
The invention belongs to the technical field of electronic information, and particularly relates to a receiving and transmitting antenna integrated short feeder multi-parameter multi-channel weather radar and application thereof.
Background
At present, the superiority of the multi-parameter measurement of the same target is similar to the characteristic of tomography, so that the observation target has the display of different dimensions in different conditions, states and physical characteristics, and the method has an important effect on the internal relation and the physical characteristic of an inversion weather system. Thus, weather radars with multi-parameter measurement capability will increasingly become more important and efficient detection equipment. The structure of the conventional radar consists of four parts, namely an antenna, a feeder line, a transceiver and a signal information processing system, wherein no matter the radar is fixed or movable, the antenna is positioned at the highest position outdoors, the transceiver and the signal information processing system are arranged in a corresponding cabinet and placed at proper positions indoors, and the feeder line is an important link for connecting the transceiver and the signal information processing system. In applications of single channel doppler radar, this electrical structure is perfectly reliable. However, in multi-channel systems for multi-parameter detection, such as dual-polarization and dual-wavelength radars, the electrical structure has certain hidden troubles; to eliminate or mitigate this potential or effect, multiple multi-channel highly stable rotary joints are required, at the expense of extremely high cost. In order to solve the problem, a multi-parameter weather radar system with an integrated short feeder electric structure of a transceiver antenna is provided.
Through the above analysis, the problems and defects of the prior art are as follows: due to the fact that signal transmission channels of the rotary joint have inconsistent signal electrical performance at different angle positions, amplitude and phase errors of transmission signals are caused. Therefore, in the scanning process of the weather radar, parameter measurement errors caused by the azimuth and pitching rotary joints cannot be avoided, and although for a single-polarization weather radar, the errors can be compensated through electrical property tests of the rotary joints at different angles, the process is complicated; especially for dual-polarization weather radar application, the requirement on the measurement accuracy of the polarization parameters is high, such as the differential reflectivity ZdrThe measurement error of the method is usually required to be within the range of +/-0.1 dB, and larger measurement errors have larger influence on weather radar precipitation estimation and particle phase state identification; for multi-parameter and multi-wavelength weather radar application, the rotary joint needs to realize good impedance matching in a large-bandwidth working range, the requirements of good isolation and polarization isolation among channels are met, the requirement of high power capacity is met, and the mechanical design, the electrical design, the processing precision and the assembly of the multi-channel rotary joint are high. Therefore, in a multi-parameter detection multi-channel weather radar system, the electrical structure in the prior art has certain hidden danger; to eliminate or mitigate this potential or effect, multiple multi-channel highly stable rotary joints are required, at the expense of extremely high cost.
The difficulty in solving the above problems and defects is:
in the prior art, for multi-parameter multi-channel weather radar application, the requirement on amplitude-phase consistency of the azimuth pitching rotary joint at different angles is high, and meanwhile, good impedance matching and inter-channel isolation are met in a large bandwidth range, and higher power capacity is required. The existing multi-channel rotary joint mostly adopts one to two paths as high-power waveguide channels, and the rest are medium-power or low-power coaxial channels, which can not meet the requirement of high-power capacity; the multi-channel isolation indexes with different wavelengths are applied to the multi-wavelength weather radar, so that the application requirements are difficult to meet, and the multi-channel high-stability rotary joints are adopted, so that the complexity of the radar equipment is greatly increased, and the cost is greatly increased.
The significance of solving the problems and the defects is as follows: the antenna integrated short feeder line radar structure at the transceiving position has good impedance matching, the problem of signal amplitude consistency caused by the use of a rotary joint can be avoided, an independent physical channel has good channel isolation, the complicated electrical characteristic and mechanical mechanism design of the rotary joint are avoided, and the influence of the working reliability of the rotary joint on the performance of a weather radar system is reduced; meanwhile, the design and application of the short feeder greatly reduce the attenuation of analog signals in the transmission process, and are favorable for improving the signal-to-noise ratio of a weather radar system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a receiving and transmitting antenna integrated short feeder multi-parameter multi-channel weather radar and application thereof.
The invention is realized in such a way that the antenna integrated short feeder multi-parameter multi-channel weather radar at the transmitting and receiving position is provided with an antenna base;
a rotating platform is arranged at the upper end of the antenna base, a signal case is arranged at the left end of the rotating platform, and an auxiliary case is arranged at the right end of the rotating platform; an N-channel transmitter, an N-channel analog receiving front end, a transmitting waveform generator, a digital signal processor and a frequency synthesizer (frequency synthesizer) are arranged in the signal case; the frequency synthesizer is connected with the transmitting waveform generator, provides input signals such as a clock and a local oscillator signal for the transmitting waveform generator, provides radar transmitting signals required by the multi-parameter multi-channel weather radar for the transmitting waveform generator, and transmits the signals VTXIs connected with the N-channel transmitter, the digital signal processor is connected with the N-channel transmitter through a trigger signal Tr, and the frequency synthesizer is connected with the local oscillator VloThe N-channel analog receiving front end is connected with the N-channel analog receiving front end;
the N-channel transmitter is connected with the first circulator through a first transmitting channel, the N-channel transmitter is connected with the Nth circulator through an Nth transmitting channel, and the N-channel analog receiving front end is connected with the digital signal processor;
the digital signal processor comprises an N-channel ADC intermediate frequency acquisition unit, an N-channel digital intermediate frequency receiver is formed by processing N-channel digital signals, and an output signal and a control signal are communicated and interacted with the radar control cabinet through an optical fiber and a hybrid collector ring of the antenna base.
Further, a hybrid collector ring is arranged on the antenna base.
Further, the hybrid slip ring is provided with a cable, an optical fiber and a gas pipeline.
Furthermore, the left side and the right side of the antenna base are provided with counterweights.
Furthermore, a waveguide support is installed at the top of the rotating platform, and an N-channel waveguide and a rotating parabolic antenna are arranged on the waveguide support.
Further, a dual-polarized multi-wavelength horn feed source is arranged at the upper end of the rotary parabolic antenna.
Furthermore, a first feed source is arranged on the first circulator, and an Nth feed source is arranged on the Nth circulator.
Furthermore, the first circulator is connected with the N-channel analog receiving front end through a first receiving channel, the N-channel analog receiving front end is connected with the digital signal processor, and the Nth circulator is connected with the N-channel analog receiving front end through an Nth receiving channel.
Furthermore, the frequency synthesizer is connected with the digital signal processor through a clock CLK signal, and the frequency synthesizer is connected with the digital signal processor through a state and control signal.
The invention also aims to provide an application of the antenna integrated short feeder multi-parameter multi-channel weather radar at the transceiving position in the realization of accurate measurement of the radar on the meteorological target multi-parameter.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention discloses a receiving and transmitting antenna integrated short feeder multi-parameter multi-channel weather radar technology, which is used for realizing accurate measurement of meteorological target multi-parameters by a radar. The device consists of a perfect electromechanical system, wherein the mechanical system comprises an antenna pedestal, an antenna azimuth, a pitching supporting and driving mechanism, a case closed environment drying and cooling control mechanism and an antenna and case supporting mechanism; the telecommunication system comprises a short feeder line rotary paraboloid multi-wavelength dual-polarized antenna feeder line system, a signal case, an auxiliary case and a cable connecting system comprising an azimuth collector ring and a pitching collector ring. The integrated structure of the antennas at the transmitting and receiving positions ensures that the transceiver and the antenna are connected in a rotation-free joint and a short feeder line multi-channel mode, so that the transceiver has extremely excellent loss, consistency and stability, and the excellent amplitude-phase performance of multi-parameter measurement is ensured; the receiving and transmitting parts are integrated, so that the echo signals detected by the radar are directly changed into digital signals, and the digital signals are transmitted to the next stage through optical fibers after being processed, and the influences of noise, attenuation, amplitude-phase distortion and the like caused by the introduction of an analog transmission channel are greatly reduced. The introduced drying and cooling control technology ensures that the closed environment in the case which moves upwards to the antenna is equivalent to the air conditioning environment in a conventional radar chamber, and ensures the normal working environment conditions of the transceiver and the signal processor. Therefore, the multi-parameter quality of the radar for detecting the meteorological target is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a multi-parameter multi-channel weather radar with a short feeder line integrated with antennas at a transceiving station according to an embodiment of the present invention.
Fig. 2 is a block diagram of a conventional dual-polarized doppler weather radar according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a weather radar system with a short-feed line and dual polarization integrated with antennas at a transceiving station according to an embodiment of the present invention.
Fig. 4 is a block diagram illustrating a signal channel of a weather radar with a short-feed line and dual polarization integrated with a transceiver antenna according to an embodiment of the present invention.
In the figure: 1. an N-channel transmitter; 2. a transmit waveform generator; 3. frequency synthesis; 4. an N-channel analog receiving front end; 5. an Nth circulator; 6. a digital signal processor; 7. a signal chassis; 8. balancing weight; 9. an antenna mount; 10. a cable; 11. an optical fiber; 12. a gas conduit; 13. a hybrid slip ring; 14. an auxiliary chassis; 15. rotating the platform; 16. a channel N waveguide; 17. supporting the waveguide; 18. a rotating parabolic antenna; 19. a dual-polarized multi-wavelength horn feed source; 20. channel 1 waveguide; 21. a first circulator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a multi-parameter multi-channel weather radar with an integrated short feeder for antennas at a transmitting and receiving position, and the invention is described in detail below with reference to the attached drawings.
Those skilled in the art can also implement the steps by using the short-feeder multi-parameter multi-channel weather radar integrated with transceiver antennas, and the short-feeder multi-parameter multi-channel weather radar integrated with transceiver antennas provided by the invention in fig. 1 is only one specific embodiment.
As shown in fig. 1, in the antenna base 9 of the transceiver antenna integrated short-feeder multi-parameter multi-channel weather radar provided in the embodiment of the present invention, a hybrid slip ring 13 is provided, where the hybrid slip ring 13 is provided with a cable 10, an optical fiber 11, and a gas pipeline 12; the left side and the right side of the antenna base 9 are provided with counterweights 8, the upper end of the antenna base 9 is provided with a rotating platform 15, the left end of the rotating platform 15 is provided with a signal case 7, and the right end of the rotating platform 15 is provided with an auxiliary case 14; the top of the rotating platform 15 is provided with a waveguide support 17, the waveguide support 17 is provided with a channel N waveguide 16, a rotary parabolic antenna 18 and a channel 1 waveguide 20, and the upper end of the rotary parabolic antenna 18 is provided with a dual-polarized multi-wavelength horn feed source 19.
The signal cabinet 7 is internally provided with a frequency synthesizer 3 and a digital signal processor 6, the frequency synthesizer 3 is connected with the digital signal processor 6 through a clock C1K signal, and the frequency synthesizer 3 is connected with the digital signal processor 6 through a state and control signal; frequency synthesizer 3 passes local oscillator VloConnected to the N-channel analog receive front end 4. Frequency synthesizer 3 and transmittingThe waveform generator 2 is connected, the transmitting waveform generator 2 transmits a signal VTXConnected to the N-channel transmitter 1, the digital signal processor 6 is connected to the N-channel transmitter 1 by a trigger Tr signal. The N-channel transmitter 1 is connected to the first circulator 21 through a first transmitting channel, and the N-channel transmitter 1 is connected to the nth circulator 5 through an nth transmitting channel. The first circulator 21 is connected to the N-channel analog receiving front end 4 through a first receiving channel, the N-channel analog receiving front end 4 is connected to the digital signal processor 6, and the nth circulator 5 is connected to the N-channel analog receiving front end 4 through an nth receiving channel. Wherein, a first feed source is arranged on the first circulator 21, and an nth feed source is arranged on the nth circulator 5.
The technical solution of the present invention will be described in detail with reference to the following specific examples.
1. Description of the System
Firstly, a rotary joint is abandoned and a short feeder technology is adopted, so that fluctuation of measurement parameters caused by rotation of an antenna is avoided.
The multiparameter weather radar system with the antenna integrated short feeder electric structure at the transceiving position is shown in figure 1. The receiving and transmitting channels of the multi-parameter radar are at least two channels, such as single dual polarization or dual wavelength, both have multi-parameter detection capability and are double channels; under the condition of dual polarization and dual wavelength, four channels are needed, and more measurement parameters are needed. In the figure, the number of channels is assumed to be N.
If the radar is in a single-wavelength dual-polarization radar form, the antenna feed source can adopt a dual-polarization feed source; the primary antenna reflector can be implemented using a single paraboloid of revolution, whether center fed or offset fed, and whether in the form of a conventional single reflector or cassegrain double reflector antenna.
If the dual-wavelength dual-polarization radar is adopted, the antenna feed source adopts a coaxial dual-wavelength feed source, and the method of the single rotating paraboloid antenna still works. The configuration of figure 1 is useful if other forms of multi-feed single-dish antenna technology are used.
In more complex cases, the use of a multi-reflector antenna configuration may be required. In that case, although there may be multiple feeds and reflectors, and the beams are not coaxial, the axes of each beam are parallel and the spacing is always constant, which is still effective for detection of meteorological objects. There is no technical difference in the method of multi-channel feeder connection from the presentation in fig. 1.
According to the conventional radar structure, at least 1 azimuth and elevation of each of 1 transceiving channel are needed, and 2 rotating joints (also called hinges) are needed. If N channels are used, then 2N revolute joints are required.
Assuming that the repeatability of each rotary joint is good, namely, during the rotation, the amplitude and phase errors of each rotation to the same position are negligible, and only the difference exists in different positions, the transfer characteristic, namely the system function, can be expressed by the formula (1):
wherein H is a transfer function, A is an amplitude characteristic,
for the phase characteristic, θ is the angle rotated by the rotary joint, exp represents an exponential function with the natural number as the base, and subscript f represents the forward transfer, i.e. the transmission signal is transmitted through the antenna via the azimuth and elevation rotary joints; subscript b indicates reverse direction propagation, i.e., the antenna received signal enters the receiver through the azimuth and elevation rotary joints; the subscript n denotes the channel number.
In the multichannel, if the channels are the same wavelength channels and the isolation between the channels is not ideal enough, the formula (1) should also increase the mutual coupling condition, and the formula is changed into the formula (2):
where, subscript i is the serial number of the cross-coupled channel, and when i ═ n, it indicates the condition of the channel n, i.e. the coupled channel and the current signal channel are the same channel, CfnnAnd CbnnAre all 1, as shown in formula (1); c defined by other i subscriptsfinAnd CbinRepresenting the forward and reverse cross-channel coupling coefficients, respectively.
Suppose that the fluctuation of the amplitude characteristic A with theta is deltaACharacteristic of phase
Fluctuation with theta of
Example analysis
Fig. 2 is a schematic diagram of a conventional dual-polarized radar telecommunication structure. For the antenna operation, the radar is provided with 1 double-channel azimuth rotary joint and 2 single-channel elevation rotary joints.
According to the experimental result, the forward and reverse fluctuation characteristics are equivalent. For the X band, the fluctuation delta of the amplitude characteristic A with thetaAThe maximum phase characteristic can reach 0.25dB (change by 5.9 percent)
Fluctuation with theta
The maximum angle can reach 7 degrees; for the C band, the fluctuation delta of the amplitude characteristic A with thetaAThe maximum phase characteristic can reach 0.1dB (change by 2.3 percent)
Fluctuation with theta
The maximum angle can reach 1.6 degrees; the S-band situation is close to the C-band. Similarly, when i ≠ n, CfinAnd CbinIs a complex number with an amplitude of about-40 to-30 dB (10)-4To 10-3) Magnitude, the effect of its phase angle is negligible due to the low amplitude.
Each channel needs to pass through 2 rotational joints, and the transmission (forward transfer function) and reception (reverse transfer function) of the radar correspond to a cascaded relationship. Therefore, according to the theory of error analysis, there are 2The amplitude measurement error caused by the rotary joint reaches 4 delta at mostAThe phase measurement error will be maximized
This is the worst case and usually not so bad. However, it cannot be said that the worst case will not occur, but the probability will not be too high. Even then, the fluctuation or error exceeds the requirement of the weather radar on dual polarization measurement, so that the actual measurement data of the radar is difficult to use or the use effect is poor. The situation is worse if more parameters and channels are used, and cross-coupling is considered.
In the multi-parameter weather radar system with the integrated short feeder line electric structure at the receiving and transmitting position, because the receiving and transmitting system, the signal processing system and the like are directly arranged on the radar antenna, a microwave component with larger fluctuation of performance in work, such as a rotary joint, is thoroughly abandoned, and the fluctuation or the error caused by the rotary joint does not exist. For the multi-receiving-channel radar with multi-parameter detection, the rotation joint is eliminated, and random inconsistent errors between channels possibly caused by the rotation of the antenna are avoided, so that the stability and reliability of the parameters estimated by using the measurement of channel correlation are ensured.
In the left half of fig. 1, a schematic illustration of N-channel transmit, N-channel receive, and connection to an N-channel antenna feed via a shorting feed is depicted. Obviously, the feeder link is short, and only a plurality of small sections of waveguides (elements) with stable performance and circulator parts are arranged, so that the attenuation of the radar feeder is reduced to the minimum.
And secondly, a hybrid collector ring introducing a photoelectric-gas hybrid transmission technology is adopted, so that the reliability of radar data transmission, the accuracy of motion control and the suitability of the working environment of a key extension set are ensured.
The three hybrid slip rings (also called slip rings) in fig. 1 perform the function of "opto-electric" hybrid transmission. Each slip ring delivers 3 different types of signals or substances, i.e. "optical transmission" means the delivery of a plurality of parametric data detected by radar at giga-rate; "electric transmission" means the transmission of electric power (power supply and motor control strong electric signals) and the transmission of control signals; "air transport" means the delivery of dry and cool air. The optical transmission transmits digital signals, is insensitive to amplitude under the condition of a certain signal-to-noise ratio, and has perfect transmission performance in an optical convergence ring; the control signal transmitted by the electric transmission is also a digital signal, is insensitive to amplitude under the condition of a certain signal-to-noise ratio, has perfect transmission performance in an electric bus ring, and has less tiny fluctuation attenuation when being used for transmitting electric power; the small transmission rate fluctuations of the dry and cold air conveyed in the "air transport" are naturally also insufficient to affect the drying and cooling performance. Therefore, it is appropriate to transmit such a signal or substance in rotation.
In radar, two rotational degrees of freedom, azimuth and pitch, require two stages of "opto-electric" hybrid rotary joints, as shown in the right half of fig. 1. The lower left portion of fig. 1, depicts an N-channel analog receive front end, and an N-channel ADC intermediate frequency acquisition, forming an N-channel digital intermediate frequency receiver through N-channel digital signal processing. And subsequent signal processing, the N-channel complex signals are integrated into a multi-basic physical parameter data set and converted into optical signals, and node connection and terminal reception are carried out through an optical rotary joint (in a photoelectric mixed rotary joint), optical fibers and a specially designed optical transceiver, so that perfect radar data transmission is realized. The control commands of the remote control computer are also uploaded through the optical transmission channel.
The downloaded multi-basic physical parameter data set comprises multi-channel echo information processed by a signal processor. Such as horizontal/vertical polarization echo information, and echo information of different wavelengths, etc.
The electric transmission is used for transmitting electric power, and is mainly used for a high-power supply of a transmitter, various power supplies of a receiver and a signal processor, and a strong electric signal driven by a pitching motor; the transmission control signal is used for communication among the extension units, the downloading of the pitch position measurement electric signal and the like. The "air transmission" means the transmission of dry and cool air, and is used to adjust the working environment of each subsystem in the signal case and the auxiliary case (used for installing parts such as power supply with larger volume) on the antenna, i.e. to cool and dry, so that the working temperature and humidity can meet specific requirements, and the purpose of improving the working conditions is achieved.
And finally, the comprehensive control including power supply control, startup and shutdown flow control and servo control is realized in the radar control cabinet, and a plurality of paths of dry and cold gas generators are additionally arranged.
The multi-channel dry-cold gas generator is a core component for actively adjusting the working environment of the key extension/component of the radar, the performance of the multi-channel dry-cold gas generator is superior to that of an air cooling mode, and the defect that dehumidification devices cannot be installed on all cases on an antenna even is overcome by adopting an air transmission technology. The principle of the dry cooling gas generator is that a high-power semiconductor refrigerator is used, the semiconductor refrigerator is arranged in a closed chamber, external air enters the closed chamber, the air is cooled to be below the dew point temperature of the air on a low-temperature condensation plane caused by the semiconductor refrigerator, water vapor in the air is condensed to be named dew (liquid state) and is discharged, the air humidity is greatly reduced, and meanwhile, the temperature is reduced. The dry and cold air is sent out by a high wind pressure axial flow fan, and the dry and cold air reaches each case on the antenna by an air transmission technology. The number of dry and cold gas generators is determined mainly by the number of radar heat emitting extensions/components (e.g., transmitters), and generally is not less than two.
2. Examples of the embodiments
The structure schematic diagram of a short-feeder dual-polarized weather radar system integrated with a transceiver antenna by using the technology is shown in figure 3, and the schematic block diagram is shown in figure 4.
As can be seen from fig. 3, the radar is structurally divided into three parts. The first part is an antenna complex and is positioned at a relative high place (such as a roof) without shielding outdoor visual field, the second part is a main control cabinet and is positioned in a radar room under the antenna complex, and the third part is an operation center (namely a display control center) and is positioned at a service unit needing to use radar to detect data.
The antenna complex is a typical unified complex organically combining a transmitter, an analog receiving front end, a signal processor and the like with an antenna feeder, namely, the technical requirement of the antenna integrated short feeder at the transmitting and receiving position is met. All microwave components of the radar for detection are bound on the radar antenna, and are reflected in a parabolic reflector, a dual-polarization feed source, a connecting waveguide, a dual-channel transmitter, a dual-channel receiver, two circulators and the like in a signal case of the antenna, so that a rigid fixed firm structure and stable-performance electrical connection are formed.
The transmission and delivery of the "opto-electrical" is accomplished by an azimuth multichannel hybrid bus ring, several connection components (fiber, cable and gas conduits and their connectors), and two elevation multichannel hybrid bus rings to the signal chassis and the auxiliary chassis.
The main control cabinet is a place for implementing radar control, a source of power supply and a node for data transmission. In the main control cabinet, four parts of an uninterruptible power supply system (an energy storage battery bin box of the uninterruptible power supply system is positioned outside the main control cabinet), a dual-channel dry-cold air generator, a system control and servo extension set, a specially designed special optical transceiver and the like are respectively arranged from bottom to top. The important control process is briefly described below.
The system control realizes hardware control of radar operation and monitoring of operation states, such as detection and recording of the operation states of a switch transmitter, a receiver and a servo extension set. The system control has a safety monitoring function, and when severe conditions occur in the operation process, which may cause the operation environment of the radar system to become severe or may cause damage, the system can immediately stop the operation command of the current radar, and even shut down the whole machine partially or according to a preset sequence.
The function of the servo extension is to control the operation of the radar antenna so as to meet the requirements of detecting and collecting accurate spatial positions (azimuth and elevation) of weather system data. The antenna position is determined by two sets of angle measuring motors (brushless resolvers) mounted on the antenna with a fixed speed ratio relationship to the azimuth/elevation axis. The motor signal is transmitted and used in a high-precision angle coding mode after being subjected to digital conversion.
The driving of the antenna is realized by using an ac servo motor (also called a brushless dc servo motor), which is excited in an ac pulse width modulation manner. The high-precision and high-reliability control of antenna positioning and uniform motion is realized through a fuzzy PID control logic algorithm.
The specially designed special optical transceiver is also an important execution mechanism for analyzing commands sent by the operation center through optical fiber transmission, initiating control requests and collecting radar operation states, besides the functions of transferring and relaying the commands and data of the signal processor and the operation center. The operation center (i.e. display control center) is composed of an optical transceiver and a group of (at least one) computer, and the function of the operation center is to send out a radar control command through an optical fiber transmission channel to complete meteorological data acquisition, receive and display a radar terminal with multiple parameters measured by a radar in an optimal mode.
Fig. 4 is a block diagram of the weather radar signal channel with short feeder line and dual polarization integrated with the transceiver antenna in the embodiment. Because the system belongs to a dual-polarization measurement structure, a high-power vacuum tube amplifier is used, the structure is relatively simple, and the emission waveform of the high-power vacuum tube amplifier can be directly output from a frequency synthesizer to be a simple frequency spectrum control waveform. The dual-channel transmitting signal can be obtained through the high-power 3dB power divider, so that the consistency of dual-channel transmitting is better.
The three ends of the transmitting terminal, the antenna terminal and the receiving terminal are connected together through the two circulators, and the isolation of the signal flow direction is realized, namely the transmitting terminal is transmitted to the antenna terminal, and the receiving terminal is transmitted to the receiver. The receiver consists of a low noise amplifier, an image frequency rejection mixer, an intermediate frequency amplifier, a high-speed intermediate frequency acquisition ADC, a digital down-conversion (completed in a digital signal processor) and the like. Since the two channels operate under the same condition that the ambient temperature is controlled, the consistency of the performance of noise, gain and the like is relatively easy to satisfy.
Obviously, the measurement deviation caused by the difference of the system (mainly referring to the performance of the transmitting-receiving channel) is almost negligible, and the radar measurement parameters are caused by the target characteristics. This enables accurate measurement of the target.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A receiving and transmitting antenna integrated short feeder line multi-parameter multi-channel weather radar is characterized in that the receiving and transmitting antenna integrated short feeder line multi-parameter multi-channel weather radar is provided with
An antenna base;
a rotating platform is arranged at the upper end of the antenna base, a signal case is arranged at the left end of the rotating platform, and an auxiliary case is arranged at the right end of the rotating platform;
a signal case:
an N-channel transmitter, an N-channel analog receiving front end, a transmitting waveform generator, a digital signal processor and a frequency synthesizer are arranged in the signal case;
the N-channel transmitter is connected with the first circulator through a first transmitting channel and is connected with the Nth circulator through an Nth transmitting channel;
the first circulator is connected with the N-channel analog receiving front end through a first receiving channel, the Nth circulator is connected with the N-channel analog receiving front end through an Nth receiving channel, and the N-channel analog receiving front end is connected with the digital signal processor;
the frequency synthesizer is connected with the transmitting waveform generator, provides input signals such as a clock and a local oscillator signal for the transmitting waveform generator, provides radar transmitting signals required by the multi-parameter multi-channel weather radar for the transmitting waveform generator, and transmits the signals VTXThe digital signal processor is connected with the N-channel transmitter through a trigger signal Tr; frequency synthesis pass local oscillator VloThe N-channel analog receiving front end is connected with the N-channel analog receiving front end;
the digital signal processor comprises an N-channel ADC intermediate frequency acquisition unit, an N-channel digital intermediate frequency receiver is formed by processing N-channel digital signals, and an output signal and a control signal are communicated and interacted with the radar control cabinet through an optical fiber and a hybrid collector ring of an antenna base;
an auxiliary case:
the auxiliary case can be used for placing power supplies required by the signal case according to specific radar application, such as a high-power supply of a transmitter, various power supplies of a receiver and a signal processor and a control module;
controlling the cabinet:
the radar control cabinet is used for placing a power supply system, a multi-channel dry and cold air generator, a system control and servo extension set and an optical transceiver key module extension set; the control cabinet is located the radar computer lab, utilizes the mixed transmission technology of photoelectricity, is connected with signal machine case and supplementary quick-witted case through mixed collector ring through optic fibre, cable and gas pipeline, accomplishes the reliable transmission of radar data and control signal, guarantees signal machine case and supplementary quick-witted case operational environment stability.
2. The transceiver antenna integrated short-feed multi-parameter multi-channel weather radar as claimed in claim 1, wherein a hybrid slip ring is provided on the antenna base, the hybrid slip ring being provided with cables, optical fibers, and gas pipes.
3. The transceiver antenna integrated stub feeder multiparameter multichannel weather radar of claim 1, wherein weights are provided on both left and right sides of the antenna base.
4. The transceiver antenna integrated short-feed multi-parameter multi-channel weather radar as claimed in claim 1, wherein a waveguide support is installed on the top of the rotating platform, and an N-channel waveguide and a paraboloid of revolution antenna are arranged on the waveguide support.
5. The antenna-integrated short-feed multi-parameter multi-channel weather radar of claim 4, wherein a dual-polarized multi-wavelength horn feed is arranged at the upper end of the paraboloid of revolution antenna.
6. The antenna-integrated short-feed multi-parameter multi-channel weather radar of claim 1, wherein a first feed is provided on the first circulator, and an nth feed is provided on the nth circulator.
7. The transceiver antenna integrated stub multi-parameter multi-channel weather radar of claim 1 wherein the frequency synthesizers are connected to the digital signal processor via clock CLK signals and the frequency synthesizers are connected to the digital signal processor via status and control signals.
8. The antenna-integrated short-feed multi-parameter multi-channel weather radar of claim 1, wherein the first circulator is connected to an N-channel analog receive front-end through a first receive channel, the N-channel analog receive front-end is connected to the digital signal processor, and the N-th circulator is connected to the N-channel analog receive front-end through an N-th receive channel.
9. The antenna-integrated short-feeder multi-parameter multi-channel weather radar according to claim 1, wherein the multi-channel dry and cold air generator adopts a dry cooling control technology to realize dry cooling control of the enclosed environment of the signal chassis and the auxiliary chassis according to temperature and humidity information of the signal chassis, which is acquired by a temperature and humidity sensor placed in the signal chassis, so that stability of a working environment is ensured, influence of environmental temperature and humidity fluctuation on an N-channel transmitter and an N-channel analog receiver is greatly improved, and stability of detection performance is ensured.
10. Use of the antenna-integrated short-feed multi-parameter multi-channel weather radar according to any one of claims 1 to 9 for accurate multi-parameter measurement of meteorological targets by the radar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210034076.0A CN114400430A (en) | 2022-01-12 | 2022-01-12 | Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210034076.0A CN114400430A (en) | 2022-01-12 | 2022-01-12 | Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114400430A true CN114400430A (en) | 2022-04-26 |
Family
ID=81230257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210034076.0A Pending CN114400430A (en) | 2022-01-12 | 2022-01-12 | Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114400430A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080084357A1 (en) * | 2006-10-04 | 2008-04-10 | Weather Detection Systems, Inc. | Multitransmitter rf rotary joint free weather radar system |
| CN102981163A (en) * | 2012-12-20 | 2013-03-20 | 西安电子工程研究所 | Dual-polarization weather radar structure integrating antenna and transmit-receive system |
| CN103323850A (en) * | 2013-05-28 | 2013-09-25 | 芜湖航飞科技股份有限公司 | Double-linear polarization Doppler weather radar system |
| CN204103021U (en) * | 2014-09-19 | 2015-01-14 | 张鹿平 | There is the aeration type radar antenna retainer that temperature and humidity regulates |
| CN205376768U (en) * | 2016-01-08 | 2016-07-06 | 张鹿平 | Insect detection radar antenna feeding system with synthesize and survey performance |
| CN105974371A (en) * | 2016-06-21 | 2016-09-28 | 珠海纳睿达科技有限公司 | Phased array meteorological radar antenna structure |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
| CN111190184A (en) * | 2020-02-24 | 2020-05-22 | 南京信大气象科学技术研究院有限公司 | Pitching multi-beam weather radar and detection method thereof |
-
2022
- 2022-01-12 CN CN202210034076.0A patent/CN114400430A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080084357A1 (en) * | 2006-10-04 | 2008-04-10 | Weather Detection Systems, Inc. | Multitransmitter rf rotary joint free weather radar system |
| CN102981163A (en) * | 2012-12-20 | 2013-03-20 | 西安电子工程研究所 | Dual-polarization weather radar structure integrating antenna and transmit-receive system |
| CN103323850A (en) * | 2013-05-28 | 2013-09-25 | 芜湖航飞科技股份有限公司 | Double-linear polarization Doppler weather radar system |
| CN204103021U (en) * | 2014-09-19 | 2015-01-14 | 张鹿平 | There is the aeration type radar antenna retainer that temperature and humidity regulates |
| CN205376768U (en) * | 2016-01-08 | 2016-07-06 | 张鹿平 | Insect detection radar antenna feeding system with synthesize and survey performance |
| CN105974371A (en) * | 2016-06-21 | 2016-09-28 | 珠海纳睿达科技有限公司 | Phased array meteorological radar antenna structure |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
| CN111190184A (en) * | 2020-02-24 | 2020-05-22 | 南京信大气象科学技术研究院有限公司 | Pitching multi-beam weather radar and detection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lee et al. | Photonic wideband array antennas | |
| EP2360491B1 (en) | Radar system with optical communications link within antenna pedestal | |
| KR101813118B1 (en) | Antenna system | |
| US8248318B2 (en) | Antenna system for communications on-the-move | |
| CN107015218B (en) | Three-coordinate low-altitude small target radar | |
| CN109959909B (en) | Single-transmitting double-receiving RCS (remote control system) testing system and testing method for circular polarization testing | |
| CN102243304A (en) | Foundation-based atmosphere profile microwave detector | |
| CN111654335B (en) | Wireless test method of relay data transmission system under whole satellite near field | |
| JP2004506207A (en) | Radio frequency receiver with passive monopulse comparator | |
| CN113589290B (en) | Movable three-band multi-parameter Doppler weather radar detection system and detection method | |
| KR101913819B1 (en) | Long Range Radar Array Antenna, Horizontal Array with Antenna Radiating Elements, Antenna Apparatus for Long Range Radar | |
| CN113176454A (en) | Reflective terahertz liquid crystal phase control array surface testing system and method | |
| WO2003058755A1 (en) | Antenna arrangement with rf components mounted to the back surface of a reflector element | |
| CN114400430A (en) | Transceiving antenna integrated short feeder multi-parameter multi-channel weather radar and application | |
| US7760129B1 (en) | Simultaneous dual polarization radar system with optical communications link | |
| WO2001065641A1 (en) | Tuneable antenna | |
| CN109786968B (en) | Adjustable fan-shaped wave beam VICTS array antenna | |
| CN211856750U (en) | Antenna housing test system | |
| Gómez et al. | Dual K-band/S-band tracking ground station antenna for future earth observation applications | |
| CN213989215U (en) | Portable antenna control device for short backfire antenna | |
| CN220856915U (en) | Direct-drive VICTS satellite transmitting antenna integrated with power amplifier | |
| Norrod et al. | Design and implementation of a low-noise prime-focus S/X receiver system for radio astronomy | |
| CN111342198B (en) | Wireless feed system for antenna measurement | |
| CN114325135B (en) | Antenna measuring device and radar test system | |
| Levy et al. | The ultra cone: An ultra-low-noise space communication ground radio-frequency system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220426 |
|
| RJ01 | Rejection of invention patent application after publication |