CN104330801B - Active phased array weather radar system based on full-digital array - Google Patents
Active phased array weather radar system based on full-digital array Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention relates to an active phased array weather radar system based on a full-digital array. The system comprises a signal processing machine which is used for emitting a wave beam, receiving the wave beam and processing echo data; the signal processing machine is in bidirectional communication with a monitoring terminal and a product terminal through network; the signal processing machine is connected with a first high-speed large-capacity wavelength division multiplexing optical fiber communication machine through first optical fibers; the first high-speed large-capacity wavelength division multiplexing optical fiber communication machine is connected with a second high-speed large-capacity wavelength division multiplexing optical fiber communication machine through second optical fibers; a collector ring sleeves the second optical fibers; the second high-speed large-capacity wavelength division multiplexing optical fiber communication machine is in bidirectional communication with a correcting branch and a full-digital array module; the full-digital array module is connected with an antenna array through a correction network. According to the system, a distributive receiving-transmitting assembly is adopted to improve the working reliability of a radar; the electric scanning is performed for the wave beam, so that the flexibility and variation are ensured, a plurality of wave beams can be received at the same time, and the scanning is fast; the system can work in a plurality of working modes, and the temporal-spatial resolution is high.
Description
Technical field
The present invention relates to phased array weather radar technical field, a kind of active phased array sky based on digital array
Gas radar system.
Background technology
Detecting people in the various modes of the earth atmosphere oneself depended on for existence, weather radar occupies highly importantly
Position, relative to other detection means, weather radar has high spatial and temporal resolution, it is possible to entering diastrous weather promptly and accurately
Row detection, is particularly highly effective observation instrument in the monitoring of Small and Medium Sized diastrous weather and the aspect such as short-time weather forecasting.
The China New Generation Weather Radar that China has arranged net substantially increases the monitoring to diastrous weather and pre-alerting ability,
Can the information such as quantitative detection rainfall runoff process intensity, radial velocity, speed spectrum width, with its high-spatial and temporal resolution, promptly and accurately
Remote sensing ability becomes diastrous weather, particularly the extremely effective instrument of aspect such as mesoscale diastrous weather monitoring and warning.
But owing to the change of convection weather phenomenon is quickly, the development time yardstick of convection cell is sometimes with regard to a few minutes to tens
Minute, particularly with strong convection monomers such as storms, a few minutes, monomer situation was it is possible to change a lot.Doppler's gas at present
Realizing little yardstick as radar need to improve, the time continues short change and causes the weather phenomenon of bigger harm effectively to see soon
Surveying, its main cause is that radar detection cycle length, radar detection temporal resolution are low.
The research of the phased array weather radar that China is the most relevant is still in the starting stage.Sweep volume due to phased-array radar
System is different from normal radar, and the quickly scanning of phased array weather radar can make us that medium and small scale weather process occurs, develop
And 3-D solid structure and dynamic structure have a better understanding.Therefore, it can phased-array technique certainly is that future weather radar is sent out
One important direction of exhibition, the research of the implementation method being applied to weather radar for the phased-array technique of digital array also has
Important realistic meaning.
Summary of the invention
It is an object of the invention to provide one and there is the quick scan capability of antenna beam, space power synthesis ability and Duo Bo
The active phased array Weather radar system based on digital array of bundle Forming ability.
For achieving the above object, present invention employs techniques below scheme: a kind of active phased array based on digital array
Weather radar system, including for launching beam, reception wave beam and the signal processor processing echo data, signal
Datatron by network respectively with monitor terminal, Product Terminal both-way communication, signal processor by the first optical fiber with first high speed
Large Copacity division multiplex fibre-optic communication wave machine is connected, and the first high-speed high capacity division multiplex fibre-optic communication wave machine passes through the second optical fiber and second
High-speed high capacity division multiplex fibre-optic communication wave machine is connected, and collector ring is set on the second optical fiber, the second high-speed high capacity wavelength-division multiplex
Fiber optic communication machine respectively with correction extension set, digital array module both-way communication, digital array module pass through corrective network and sky
Linear array is connected, and frequency source provides clock signal, servo drive motor defeated to digital array module, signal processor respectively
Go out end to be connected with collector ring, aerial array respectively；Described signal processor is by Digital Beam Formation Unit and Doppler's meteorologic signal
Processor form, described Doppler's meteorologic signal processor by pulse compression unit, FFT unit, frequency domain filtering unit,
IIR filter unit, DVIP unit and data formatting unit composition, Digital Beam Formation Unit and the first optical fiber bidirectional lead to
News, Digital Beam Formation Unit divides two-way to export, and a road is directly connected with monitor terminal, and another road is defeated with pulse compression unit
Entering end to be connected, the outfan of pulse compression unit input with FFT unit, IIR filter unit respectively is connected, FFT
Converter unit is connected with frequency domain filtering unit, and IIR filter unit is connected with DVIP unit, frequency domain filtering unit, DVIP unit
Outfan all inputs with data formatting unit be connected, the outfan of data formatting unit and the input of Product Terminal
It is connected.
Described digital array module is made up of 8 digital array modular units, and each digital array module unit is by 16
Digital transmitting-receiving subassembly forms, and described digital transmitting-receiving subassembly includes Waveform generating circuit, and its outfan amplifies filter with first successively
Wave circuit, receive the first up-conversion of the second local oscillation signal, the second filtering and amplifying circuit, receive on the second of the first local oscillation signal
Frequency conversion, the first wave filter, power amplifier are connected, and the outfan of power amplifier is connected with the input of circulator, circulator
With aerial array both-way communication, the outfan of circulator successively with isolation amplitude limit low noise amplifier, the second wave filter, receive first
First down coversion of local oscillation signal, the 3rd filtering and amplifying circuit, receive the second down coversion of the second local oscillation signal, the 4th amplify filter
Wave circuit is connected, and the outfan of the 4th filtering and amplifying circuit is connected with the input of digital receiver.
Described frequency source includes 100MHz crystal oscillator, and its outfan is believed with the first phaselocked loop, the second phaselocked loop and benchmark respectively
Number produce circuit input be connected, the outfan of the first phaselocked loop is connected with the input of doubler, doubler export first
The signal that shakes is to the input of a 1:8 power splitter, and the outfan of a 1:8 power splitter is connected with digital array module；Second
The outfan of phaselocked loop exports the input of the second local oscillation signal to the 2nd 1:8 power splitter, the outfan of the 2nd 1:8 power splitter with
Digital array module is connected；Described reference signal produces circuit by power division network output clock signal respectively to digital array
Module, signal processor.
Described corrective network is made up of main feeder and 128 dual directional couplers, and main feeder uses waveguide, corrective network conduct
Flange joint is passed through between one entirety and 128 antennas of composition aerial array.
The beam signal that described aerial array is transmitted drives the form transmission of the row ripple battle array of rake joist, antenna array with Narrow Wall of Waveguide limit
Row use slotted waveguide linear array.
Described correction extension set is made up of numerical-control attenuator and correction transmitting-receiving subassembly, between numerical-control attenuator and correction transmitting-receiving subassembly
Both-way communication, numerical-control attenuator is connected with corrective network, correction transmitting-receiving subassembly and signal processor both-way communication.
As shown from the above technical solution, this present invention uses distributed transmitting-receiving subassembly to replace traditional single transmitter single-receiver
Structure, improves the functional reliability of radar, reduces the overall life cycle cost of radar；High-performance, machine highly reliable, high
Dynamic, use electricity to sweep and replace traditional mechanical scanning, wave beam flexibility and changeability, reception simultaneous multiple beams, scanning speed is fast, and system can
Realize multiple-working mode work, can be by an individual flyback time within 6 minutes shorten to 1 minute, spatial and temporal resolution
High；Have employed active digital TR assembly, receive and dispatch DBF system, wave beam controls flexibly, for different types of weather target
Use different mode of operations, to different position, different target observation requirements strong adaptabilities；This radar is based on advanced Digital Arrays
Row system, uses the generation of ultralow side lobe Waveguide slot planar array antenna, direct digital synthesizers (DDS) waveform, digit pulse
The advanced technology such as compression, fast erecting/unmarshaling, networking terminal；Radar automaticity is high, uses the most fixed northern and electronic
Leveling technology, it is short that the time torn open by frame；Radar system dynamic range is big, and meanwhile, in machine, calibration facility enforcement automatic Calibration may insure that
The accuracy that systematic quantification is measured；Volume is little, lightweight, compact conformation, connects without feeder network cable, is applicable not only to car
Carrying platform, it is also possible to extend to multiple work platforms, such as airborne platform, balloon floating platform etc..
Accompanying drawing explanation
Fig. 1 is the circuit system block diagram of the present invention.
Fig. 2,3,4 are respectively the digital transmitting-receiving subassembly in Fig. 1, signal processor, the circuit block diagram of frequency source.
Detailed description of the invention
A kind of active phased array Weather radar system based on digital array, including for launching beam, receive wave beam with
And the signal processor 1 that echo data processed, signal processor 1 by network respectively with monitor terminal, Product Terminal
Both-way communication, signal processor 1 is connected by the first optical fiber and the first high-speed high capacity division multiplex fibre-optic communication wave machine, and first is high
Speed Large Copacity division multiplex fibre-optic communication wave machine is connected by the second optical fiber and the second high-speed high capacity division multiplex fibre-optic communication wave machine, converges
Stream ring set be located on the second optical fiber, the second high-speed high capacity division multiplex fibre-optic communication wave machine respectively with correction extension set 2, digital battle array
Row module 3 both-way communication, digital array module 3 is connected with aerial array 5 by corrective network 4, frequency source 6 respectively to
Digital array module 3, signal processor 1 provide clock signal, the outfan of servo drive motor respectively with collector ring, sky
Linear array 5 is connected, as shown in Figure 1.Data processing terminal is made up of monitor terminal and Product Terminal two parts, completes following master
Want function: radar control, data acquisition, radar data process, product generation, product achieve and echo, system monitoring, are
System has the ability of external network service, it is possible to realizes multi-beam and shows.
As it is shown in figure 1, described corrective network 4 is made up of main feeder 42 and 128 dual directional couplers 41, main feeder
42 use waveguide, and corrective network 4 is connected by flange as between an entirety and 128 antennas 51 of composition aerial array 5
Connect.The beam signal that described aerial array 5 is transmitted opens the form transmission of the row ripple battle array of rake joist, aerial array with Narrow Wall of Waveguide limit
5 use slotted waveguide linear array.When launching signal, digital transmitting-receiving subassembly 31 is by pumping signal phase shift, up-conversion, amplification feedback
Delivering to waveguide battle array input, radiofrequency signal is radiated space and forms required launching beam by slotted waveguide linear array, during reception,
Slotted waveguide linear array sends receiving target echo signal into digital transmitting-receiving subassembly 31 thereafter, and digital transmitting-receiving subassembly 31 is defeated
The digital signal gone out is sent into Digital Beam Formation Unit 11 and is formed required reception wave beam.Described correction extension set 2 is by numerical control attenuation
Device and correction transmitting-receiving subassembly composition, both-way communication between numerical-control attenuator and correction transmitting-receiving subassembly, numerical-control attenuator and corrective network
4 are connected, correction transmitting-receiving subassembly and signal processor 1 both-way communication.
As in figure 2 it is shown, described digital array module 3 is made up of 8 digital array modular units, each digital array
Modular unit is made up of 16 digital transmitting-receiving subassemblies 31, and described digital transmitting-receiving subassembly 31 includes Waveform generating circuit, its
Outfan successively with the first filtering and amplifying circuit, receive the first up-conversion of the second local oscillation signal, the second filtering and amplifying circuit, connect
Receive the second up-conversion of the first local oscillation signal, the first wave filter, power amplifier be connected, the outfan of power amplifier with annular
The input of device is connected, circulator and aerial array 5 both-way communication, and the outfan of circulator amplifies with isolation amplitude limit low noise successively
Device, the second wave filter, receive the first down coversion of the first local oscillation signal, the 3rd filtering and amplifying circuit, receive the second local oscillation signal
The second down coversion, the 4th filtering and amplifying circuit be connected, the outfan of the 4th filtering and amplifying circuit and the input of digital receiver
It is connected.Digital array module unit includes 16 identical transceiver channels, and each transceiver channel has independent transmission-receiving function；Entirely
Pumping signal phase shift, up-conversion, amplification are fed into waveguide battle array input by digital transmitting and receiving assembly 31, and slotted waveguide linear array will be penetrated
Frequently signal amplitude is mapped to space and forms required launching beam, and slotted waveguide linear array is sent into thereafter after receiving target echo signal
Digital transmitting-receiving subassembly 31, the digital signal of digital transmitting-receiving subassembly 31 output is sent into Digital Beam Formation Unit 11 and is formed institute
The reception wave beam needed.By controlling the relevant parameter of Waveform generating circuit DDS in digital transmitting-receiving subassembly 31, so that it may realize hanging down
Face figuration directly one-dimensional to sweep mutually with various, thus realize this radar multiple-working mode.
Fig. 2 divides upper and lower two passages, when launching signal, is first produced 50MHz intermediate frequency by the Waveform generating circuit of lower channel
Signal, amplifies filtering through the first filtering and amplifying circuit, becomes through the first up-conversion frequency conversion with the second local oscillator mixing of 1.22GHz
One intermediate-freuqncy signal of 1.27GHz, an intermediate-freuqncy signal is again after the second filtering and amplifying circuit is amplified filtering, with 8.1GHz's
First local oscillation signal mixing second up-converts to the radiofrequency signal of 9.37GHz, and radiofrequency signal is passed through through the first filter filtering again
Power amplifier amplifies by circulator arrival aerial array 5, the radiofrequency signal of 9.37GHz is radiated by aerial array 5
Space.When receiving signal, the electromagnetic wave signal of target reflection is received, is given above by circulator by aerial array 5
The isolation amplitude limit low noise amplifier of passage, down-converts to through the first local oscillator mixing first of the second filter filtering and 8.1GHz
One intermediate-freuqncy signal of 1.27GHz, an intermediate-freuqncy signal is after the 3rd filtering and amplifying circuit filtering, with second local oscillator of 1.22GHz
Mixing second down-converts to two intermediate-freuqncy signals of 50MHz, and two intermediate-freuqncy signals are converted to discrete through the digital receiver of intermediate frequency
I/q signal, output is to next stage equipment.
As it is shown on figure 3, described signal processor 1 is by Digital Beam Formation Unit 11 and Doppler's meteorologic signal processor 12
Composition, described Doppler's meteorologic signal processor 12 is by pulse compression unit, FFT unit, frequency domain filtering unit, IIR
Filter unit, DVIP unit and data formatting unit composition, Digital Beam Formation Unit 11 and the first optical fiber bidirectional communication,
11 points of two-way outputs of Digital Beam Formation Unit, a road is directly connected with monitor terminal, and another road is defeated with pulse compression unit
Entering end to be connected, the outfan of pulse compression unit input with FFT unit, IIR filter unit respectively is connected, FFT
Converter unit is connected with frequency domain filtering unit, and IIR filter unit is connected with DVIP unit, frequency domain filtering unit, DVIP unit
Outfan all inputs with data formatting unit be connected, the outfan of data formatting unit and the input of Product Terminal
It is connected.
As it is shown on figure 3, first the i/q signal that the digital receiver of DAM in Fig. 2 is sent is carried out DBF digital beam
Being formed, the data after DBF divide two-way, and a road is that initial data is directly fed to monitor terminal and stores, and another road is first carried out
Pulse compression, carries out two kinds of process respectively to the signal through pulse pressure, and the first is fast Fourier transform FFT, time domain is believed
Number be converted to frequency-region signal, frequency-region signal is carried out spectral filter, then spectrum is carried out spectrum and processes and draw the intensity of spectrum, speed and spectrum
Wide；The second, for directly time-domain signal is carried out IIR filtering, then carries out DVIP video integration process, directly obtains signal
Intensity；The result that both processes formats through data and gives Product Terminal through netting twine.
As shown in Figure 4, described frequency source 6 includes 100MHz crystal oscillator, its outfan respectively with the first phaselocked loop, second
The input that phaselocked loop produces circuit with reference signal is connected, and the outfan of the first phaselocked loop is connected with the input of doubler, times
Frequently device exports the input of the first local oscillation signal to a 1:8 power splitter, the outfan of a 1:8 power splitter and digital array
Module 3 is connected；The outfan of the second phaselocked loop exports the input of the second local oscillation signal to the 2nd 1:8 power splitter, the 2nd 1:8
The outfan of power splitter is connected with digital array module 3；Described reference signal is produced circuit and is believed by power division network output clock
Number respectively to digital array module 3, signal processor 1.Frequency source 6 predominantly digital array module 3 provides first
Shake the sampling clock needed for signal, the second local oscillation signal, digital receiver and Waveform generating circuit and work clock.First local oscillator
Signal 8.1GHz, the second local oscillation signal 1.22GHz, system reference clock 20MHz, AD sampling clock 40MHz, waveform
Produce clock 400MHz, must assure that the 20MHz work clock of each digital array module unit is concerned with and starts shooting every time simultaneously
Phase place keeps consistent.
As shown in Figure 4, frequency source 6 provides sequential and the clock of standard for whole radar system, in order to ensure signal sequence
Strict coherent, all of sequential of radar is all produced by same 100MHz crystal oscillator, and frequency source 6 mainly produces two kinds of letters
Number: the first is local oscillation signal, is divided into 8 tunnel the first local oscillation signals and 8 tunnel the second local oscillation signals to give 8 DAM respectively；
Signal on the basis of the second, is sent to DDS, i.e. Waveform generating circuit respectively, as the work clock of DDS, gives numeral and connects
The sampling clock that the A/D sample circuit of receipts machine is sampled as A/D, and the reference clock of the subsystem of signal processor 1.
Below in conjunction with Fig. 1,2,3,4, the invention will be further described.
Active phased array means that the generation (source) of emittance is on front, uses active T/R assembly.Radiation
Power produces in T/R assembly, and plurality of cells independently produces the power signal of phase with one another rule distribution and synthesizes at spatial coherence,
Produce directional beam.
Operationally, control signal and work are joined by mission computer, i.e. monitor terminal according to the mode of operation of detection demand
Number send Digital Beam Formation Unit 11, i.e. DBF, the function of Digital Beam Formation Unit 11 to include, and launching beam controls and receives ripple
Bundle is formed；When launching beam is formed, Digital Beam Formation Unit 11 is the biggest by first and second optical fiber and first and second
Control word of sending capacity division multiplex fibre-optic communication wave machine and collector ring arrives digital array module 3, and digital array module 3 passes through ripple
Shape produces circuit, i.e. DDS, it is achieved launch phase shift, produces certain frequency, the intermediate-freuqncy signal of phase place, is then passed through change
Frequently, radio frequency amplifies output to corresponding antenna 51, each array element radiation signal launching beam required for space combination.Connecing
When receiving Wave beam forming, the signal output that each array element of antenna 51 receives receives passage and will receive to digital array module 3,128 tunnel
Signal through down coversion, DDC process after export I/Q echo-signal, DDC process mainly completed by digital receiver, I/Q
Signal transmits the signal processor 1 to shelter by first and second high-speed high capacity division multiplex fibre-optic communication wave machine and collector ring；
Real-time signal processor 1 completes Adaptive beamformer (DBF) and software implementation LDA signal processor etc.；System can be flexible
Realize phased-array radar multiple-working mode.The computer data acquisition of signal processor 1, data format, former
The output of beginning data is to Product Terminal, and Product Terminal completes Meteorological Products according to the initial data that signal processor 1 is sent into and generates with aobvious
Show.Signal transmission substantially digital signal, system is highly stable reliably, and the function of system can be recombinated as required.
In sum, present invention reduces the sending and receiving via net loss of phased-array radar complexity feeder system；Because power by
A large amount of distribution separate units produce spatial coherence synthesis, therefore can obtain the highest aerial radiation general power；Reduce the resistance to merit of feeder system
Rate requirement, simplifies feeder system design；Having high system task reliability, system work is not almost had by bad several radiating elements
Have an impact；Product composition is big quantity, distributed, in order to standardization and modularized design, produces in batches and reduces cost；Side
Just optical fiber, photoelectron technology combine；Realize total digitalization and self adaptation works, the most so-called " software radio " technology；Obtain
Obtain more HDR.
Claims (6)
1. an active phased array Weather radar system based on digital array, it is characterised in that: include for sending out
Ejected wave bundle, reception wave beam and the signal processor (1) that echo data is processed, signal processor (1)
By network respectively with monitor terminal, Product Terminal both-way communication, signal processor (1) pass through the first optical fiber
It is connected with the first high-speed high capacity division multiplex fibre-optic communication wave machine, the first high-speed high capacity division multiplex fibre-optic communication wave
Machine is connected by the second optical fiber and the second high-speed high capacity division multiplex fibre-optic communication wave machine, and collector ring is set in second
On optical fiber, the second high-speed high capacity division multiplex fibre-optic communication wave machine respectively with correction extension set (2), digital battle array
Row module (3) both-way communication, digital array module (3) is by corrective network (4) and aerial array (5)
Being connected, frequency source (6) provides clock letter to digital array module (3), signal processor (1) respectively
Number, the outfan of servo drive motor is connected with collector ring, aerial array (5) respectively；Described signal processing
Machine (1) is made up of Digital Beam Formation Unit (11) and Doppler's meteorologic signal processor (12), described
Doppler's meteorologic signal processor (12) by pulse compression unit, FFT unit, frequency domain filtering unit,
IIR filter unit, DVIP unit and data formatting unit composition, Digital Beam Formation Unit (11) and the
One optical fiber bidirectional communication, the output of Digital Beam Formation Unit (11) point two-way, a road directly with monitor terminal phase
Even, another road is connected with the input of pulse compression unit, the outfan of pulse compression unit respectively with FFT
Converter unit, the input of IIR filter unit are connected, and FFT unit is connected with frequency domain filtering unit, IIR
Filter unit is connected with DVIP unit, and frequency domain filtering unit, the outfan of DVIP unit all format with data
The input of unit is connected, and the outfan of data formatting unit is connected with the input of Product Terminal.
Active phased array Weather radar system based on digital array the most according to claim 1, its feature
It is: described digital array module (3) is made up of 8 digital array modular units, each digital array
Modular unit is made up of 16 digital transmitting-receiving subassemblies (31), and described digital transmitting-receiving subassembly (31) includes
Waveform generating circuit, its outfan successively with the first filtering and amplifying circuit, receive on the first of the second local oscillation signal
Frequency conversion, the second filtering and amplifying circuit, receive the second up-conversion of the first local oscillation signal, the first wave filter, power
Amplifier is connected, and the outfan of power amplifier is connected with the input of circulator, circulator and aerial array (5)
Both-way communication, the outfan of circulator successively with isolation amplitude limit low noise amplifier, the second wave filter, receive first
First down coversion of local oscillation signal, the 3rd filtering and amplifying circuit, receive the second local oscillation signal the second down coversion,
4th filtering and amplifying circuit is connected, the outfan of the 4th filtering and amplifying circuit and the input phase of digital receiver
Even.
Active phased array Weather radar system based on digital array the most according to claim 1, its feature
Be: described frequency source (6) includes 100MHz crystal oscillator, its outfan respectively with the first phaselocked loop, second lock
The input that phase ring produces circuit with reference signal is connected, the outfan of the first phaselocked loop and the input of doubler
Being connected, doubler exports the input of the first local oscillation signal to a 1:8 power splitter, a 1:8 power splitter
Outfan is connected with digital array module (3)；The outfan of the second phaselocked loop exports the second local oscillation signal extremely
The input of the 2nd 1:8 power splitter, the outfan of the 2nd 1:8 power splitter and digital array module (3) phase
Even；Described reference signal produces circuit by power division network output clock signal respectively to digital array module
(3), signal processor (1).
Active phased array Weather radar system based on digital array the most according to claim 1, its feature
It is: described corrective network (4) is made up of main feeder (42) and 128 dual directional couplers (41),
Main feeder (42) uses waveguide, and corrective network (4) is as an entirety and composition aerial array (5)
Flange joint is passed through between 128 antennas (51).
Active phased array Weather radar system based on digital array the most according to claim 1, its feature
It is: the beam signal that described aerial array (5) is transmitted opens the shape of the row ripple battle array of rake joist with Narrow Wall of Waveguide limit
Formula is transmitted, and aerial array (5) uses slotted waveguide linear array.
Active phased array Weather radar system based on digital array the most according to claim 1, its feature
It is: described correction extension set (2) is made up of numerical-control attenuator and correction transmitting-receiving subassembly, numerical-control attenuator and school
Both-way communication between positive transmitting-receiving subassembly, numerical-control attenuator is connected with corrective network (4), correct transmitting-receiving subassembly and
Signal processor (1) both-way communication.
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Inventor after: Wang Xudong Inventor after: Bian Zhenwen Inventor after: Liu Qi Inventor after: Hao Liyong Inventor after: Cao Junwu Inventor after: Fan Hui Inventor after: Qu Kaifeng Inventor before: Wang Xudong Inventor before: Bian Zhenwen Inventor before: Liu Qi |