CN107589423B - Pitching electric scanning weather radar system and working method thereof - Google Patents
Pitching electric scanning weather radar system and working method thereof Download PDFInfo
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- CN107589423B CN107589423B CN201710638512.4A CN201710638512A CN107589423B CN 107589423 B CN107589423 B CN 107589423B CN 201710638512 A CN201710638512 A CN 201710638512A CN 107589423 B CN107589423 B CN 107589423B
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Abstract
The invention belongs to the technical field of weather radar systems, and particularly relates to a pitching electric scanning weather radar system and a working method thereof. The weather radar system comprises a receiving and transmitting component module, a power dividing/synthesizing network, a beam control panel, a switch amplification attenuation component, a receiver module, a signal processor and a rotary table module, can effectively inhibit crosstalk between pulses, and meanwhile enables blind patch points to be smoother.
Description
Technical Field
The invention belongs to the technical field of weather radar systems, and particularly relates to a pitching electric scanning weather radar system and a working method thereof.
Background
Weather radar is a powerful tool for weather detection. The appearance of the pulse Doppler weather radar creates a new situation for the detection of strong storms, the research of cloud and fog physical processes, weather artificial influence and other meteorological work. With the social development, the requirements of various industries on weather detection are higher and higher.
The traditional weather radar system adopts long and short pulses, the problem of a near-field blind area cannot be well solved, and the traditional scanning system realizes three-dimensional scanning of a weather process by changing the azimuth and the elevation of a radar antenna through a mechanical scanning method. The scanning method can complete the scanning of 10 elevation layers within 6 minutes at the fastest speed, the data acquired by the method can meet the detection requirement on the weather process which changes slowly in a large range, and the method plays a great role in improving the monitoring and prediction level of the disastrous weather. However, for the rapidly changing medium and small scale weather processes such as hail, tornado, micro downburst, wind shear and the like, the space-time resolution of the traditional mechanical scanning radar cannot meet the requirement of detecting the strong convection weather transient fine structure. Within 5 minutes, the positions and structures of thunderstorms, hailstones, tornadoes and downburst flows are changed greatly, the small-scale structures of the systems are difficult to distinguish by the spatial resolution of the existing service radar, and the detection and forecast of the fine structures in the processes needs to develop the weather radar technology for fast scanning.
Disclosure of Invention
The invention provides a pitching electrical scanning weather radar system for overcoming the defects of the prior art, solves the problems of dead zones and overlong scanning time of the solid radar technology, can acquire fine structures of cloud and rain targets, and improves the space-time resolution.
In order to achieve the purpose, the invention adopts the following technical measures:
a pitching electrically swept weather radar system comprises a transceiving component module, a power dividing/combining network, a beam control board, a switch amplification attenuation component, a receiver module, a signal processor and a turntable module, wherein,
the receiving and transmitting component module is used for outputting the transmitting signals subjected to power division by the power division/synthesis network to the waveguide line source and forming transmitting beams by the waveguide line source; the receiving and transmitting component module is also used for receiving echo signals from the waveguide line source and is respectively connected with the power dividing/synthesizing network, the beam control panel and the switch amplification attenuation component;
the power division/synthesis network is used for power division of the transmitting signal from the switch amplification attenuation component, sending the power-divided transmitting signal to the input end of the transceiving component module, receiving and synthesizing the echo signal amplified by the transceiving component module, and sending the synthesized echo signal to the input end of the switch amplification attenuation component;
the beam control board is used for outputting a control signal to the input end of the transceiving component module, and the beam control board is in bidirectional communication connection with the signal processor;
the switch amplification attenuation component is used for modulating and amplifying the up-conversion signal from the receiver module, sending the synthesized echo signal of the power division/synthesis network to the input end of the receiver module, and outputting the modulated and amplified echo signal to the input end of the receiver module; the switch amplification attenuation component is connected with the waveguide line source through a correction network;
the receiver module is in bidirectional communication connection with the signal processor;
and the signal processor is used for outputting the echo intensity and speed information received by the weather radar system and is in bidirectional communication connection with the turntable module.
Preferably, the transceiver module includes eight four-channel transceiver modules, each of the eight four-channel transceiver modules is configured to output a transmission signal after power division by the power division/synthesis network to the waveguide line source, each of the eight four-channel transceiver modules is configured to receive an echo signal from the waveguide line source, and each of the eight four-channel transceiver modules is connected to the power division/synthesis network, the beam control board, and the switch amplification attenuation module.
Preferably, the switch amplification attenuation component includes a modulation power amplifier, a numerical control attenuator, a first circulator, a first switch and a second circulator, an input end of the modulation power amplifier and an input end of the numerical control attenuator are both connected to an output end of the receiver module, an output end of the modulation power amplifier and an output end of the numerical control attenuator are respectively connected to an input end of the first circulator and an input end of the second circulator, an output end of the first circulator and an output end of the second circulator are both connected to an input end of the first switch, an output end of the first switch is connected to an input end of the receiver module, and another output end of the first circulator and another output end of the second circulator are both connected to the correction network.
Preferably, the receiver module includes a transceiving channel, a digital receiver, a waveform generating unit, and a local oscillation unit, wherein,
the receiving and transmitting channel is used for carrying out up-conversion processing on the three-pulse signal from the waveform generating unit and is also used for outputting a three-pulse intermediate frequency signal echo signal to the input end of the digital receiver; the output end of the transceiving channel is respectively connected with the input end of the modulation power amplifier and the input end of the numerical control attenuator, and the input end of the transceiving channel is connected with the output end of the first switch;
the digital receiver is used for outputting the digital 1/Q signals to the signal processor and is in bidirectional communication connection with the signal processor;
the waveform generating unit is used for generating a three-pulse signal and is in bidirectional communication connection with the signal processor;
and the output end of the local oscillator unit outputs two local oscillator signals to the input end of the receiving and transmitting channel, and the output end of the local oscillator unit respectively outputs clock signals of 1GHz, 200MHz and 80MHz to the input ends of the waveform generating unit, the digital receiver and the signal processor.
Preferably, the waveform generating unit includes a frequency divider, an FPGA controller, a first impedance converter, a DDS chip, a second impedance converter, a second switch, and a filter, an input end of the frequency divider is connected to an output end of the local oscillation unit, an output end of the frequency divider is connected to an input end of the FPGA controller, the FPGA controller is connected to the signal processor in a bidirectional communication manner, an output end of the FPGA controller is connected to input ends of the DDS chip and the second switch, an input end of the first impedance converter is connected to an output end of the local oscillation unit, an output end of the first impedance converter is connected to an input end of the filter through the DDS chip, the second impedance converter, and the second switch in sequence, and an output end of the filter outputs a three-pulse signal to an input end of the transceiving channel.
Preferably, the turntable module comprises a servo control unit, a driver, an encoder, a motor, a power supply unit, an exchanger and a data processing and displaying unit, wherein the servo control unit and the exchanger are in bidirectional communication connection with the signal processor, the input end of the servo control unit is connected with the output end of the encoder, the output end of the servo control unit is connected with the input end of the driver, and the driver is in bidirectional communication connection with the motor; the switch is in bidirectional communication connection with the data processing and display unit, and the power supply unit is used for supplying power to the servo control unit, the switch, the transceiving component module, the beam control panel, the receiver module and the signal processor respectively.
Further, the FPGA controller is made into EPCS64SI16 manufactured by ALTERA, USA, the first impedance converter is made into ETC1-1-13 manufactured by MACOM, USA, the second impedance converter is made into WBC1-1TLB manufactured by Coilcraft, USA, and the DDS chip is made into AD9858 manufactured by Analog Devices, USA.
The invention also provides a working method of the pitching electric scanning weather radar system, which comprises the following steps:
when the weather radar system transmits signals, the waveform generating unit generates three pulse signals and sends the three pulse signals to the input end of the transceiving channel, the transceiving channel carries out up-conversion processing on the three pulse signals to obtain up-conversion signals, the up-conversion signal is sent to the input end of the switch amplification attenuation component, the up-conversion signal is sent to the input end of the power dividing/synthesizing network after being modulated and amplified by the switch amplification attenuation component, the power dividing/synthesizing network divides the up-conversion signal into eight paths of signals and respectively sends the eight paths of signals to the eight four-channel receiving and transmitting assemblies for further amplification, the beam control board controls the transmitting phase-shifting codes, the receiving phase-shifting codes and the receiving attenuation codes of the eight four-channel receiving and transmitting assemblies through 422 serial ports, the eight four-channel receiving and transmitting assemblies respectively output four paths of transmitting signals to the waveguide line source, and the waveguide line source forms transmitting beams in space;
when the weather radar system receives signals, the waveguide line source sends the received echo signals to eight four-channel transceiving components for amplification, the eight four-channel transceiving components send the amplified echo signals to the power dividing/synthesizing network, the power dividing/synthesizing network synthesizes the amplified echo signals and sends the synthesized echo signals to the input end of the switch amplification and attenuation component, the switch amplification and attenuation component sends the synthesized echo signals to the transceiving channels for down-conversion processing, the transceiving channels output tri-pulse intermediate frequency signal echo signals to the input end of the digital receiver, the digital receiver sends the tri-pulse intermediate frequency signal echo signals to the signal processor, and the signal processor carries out pulse compression, clutter suppression, spectral distance estimation and quality control on the received tri-pulse intermediate frequency signal echo signals, and outputting the echo intensity and speed information received by the weather radar system through a network.
The invention has the beneficial effects that:
1) the weather radar system can effectively inhibit crosstalk between pulses and make a blind patch point smoother, can exert the efficiency of the receiving and transmitting assembly to the maximum extent, effectively utilizes the repetition frequency, effectively solves the problem of the blind area of the all-solid-state radar, can quickly and efficiently monitor a high-density scanning area, and can acquire the fine structure of a cloud and rain target.
2) The weather radar system adopts an electric scanning system in the vertical direction to replace the traditional pitching mechanical scanning, the transmitted wave beam obtained by the working method of the weather radar system is flexible and variable, the scanning speed is high, the weather radar system can realize the three-pulse frequency diversity work, the time of one body scanning can be shortened from 6 minutes to within 1 minute, and the space-time resolution is greatly improved.
3) The signal processor also has a monitoring function, can perform operations such as radar on-off control, working mode selection, working state monitoring, fault acquisition and positioning, the servo control unit is used for finishing drive control of antenna scanning and output of azimuth angle signals, and the weather radar system sends correction signals to a feeder line correction network through the switch amplification attenuation component, so that an automatic correction function is realized.
4) The waveform generating unit comprises a frequency divider, an FPGA controller, a first impedance converter, a DDS chip, a second impedance converter, a second switch and a filter, and can conveniently and quickly generate three-pulse signals, so that the weather radar system has the excellent characteristics of long detection distance and high resolution, and the anti-interference capability of the weather radar system is improved.
Drawings
FIG. 1 is a schematic block diagram of a weather radar system of the present invention;
FIG. 2 is a functional block diagram of the switching amplification attenuation module of the present invention;
FIG. 3 is a schematic block diagram of a waveform generation unit of the present invention;
FIG. 4 is a signal processing schematic block diagram of the signal processor of the present invention;
FIG. 5 is a spectrum diagram of an output signal of the waveform generating unit according to the present invention;
FIG. 6 is a graph of three pulse spectra and a segmented blind-filling curve according to the present invention.
10-transceiver module 20-power dividing/synthesizing network 30-beam control panel
40-switch amplification attenuation component 50-receiver module 60-signal processor
70-turntable module 41-modulation power amplifier 42-numerical control attenuator
43-first circulator 44-first switch 45-second circulator
51-transceiving channel 52-digital receiver 53-waveform generating unit
54-local oscillator unit 71-servo control unit 72-driver
73-encoder 74-motor 75-power supply unit
76-switch 77-data processing and display unit 531-frequency divider
532-FPGA controller 533-first impedance converter 534-DDS chip
535-second impedance converter 536-second switch 537-filter
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
As shown in fig. 1, a pitching electrical scanning weather radar system includes a transceiver module 10, a power dividing/combining network 20, a beam control board 30, a switching amplification and attenuation module 40, a receiver module 50, a signal processor 60, and a turntable module 70, where the transceiver module 10 is configured to output a transmission signal divided by the power dividing/combining network 20 to a waveguide line source, and the waveguide line source forms a transmission beam; the transceiver module 10 is further configured to receive an echo signal from the waveguide line source, and the transceiver module 10 is connected to the power splitting/combining network 20, the beam control board 30, and the switch amplification and attenuation module 40, respectively; the power dividing/synthesizing network 20 is configured to power divide the transmission signal from the switching amplification and attenuation module 40, send the power-divided transmission signal to the input end of the transceiving module 10, receive and synthesize the echo signal amplified by the transceiving module 10, and send the synthesized echo signal to the input end of the switching amplification and attenuation module 40; the beam control board 30 is used for outputting a control signal to an input end of the transceiver module 10, and the beam control board 30 is connected with the signal processor 60 in a bidirectional communication manner; the switching amplification attenuation component 40 is configured to modulate and amplify the up-conversion signal from the receiver module 50, and is configured to send the synthesized echo signal of the power dividing/synthesizing network 20 to the input end of the receiver module 50, and output the modulated and amplified echo signal to the input end of the receiver module 50; the switch amplification attenuation component 40 is connected with the waveguide line source through a correction network; a bi-directional communication connection between the receiver module 50 and the signal processor 60; the signal processor 60 is used for outputting the echo intensity and speed information received by the weather radar system, and is connected with the turntable module 70 in a bidirectional communication manner.
The switching amplification attenuation component 40 is configured to send the synthesized echo signal from the power dividing/synthesizing network 20 to an input end of the receiver module 50 through a first circulator;
the signal processor 60 receives the intermediate frequency signal by using a three-pulse compression technique, and outputs the echo intensity and speed information received by the weather radar system through a network.
The signal processor 60 is provided with clock information by the local oscillator unit 54, the signal processor 60 is provided with leading information to the waveform generating unit 53, the signal processor 60 is connected with the digital receiver 52 in an I/Q bidirectional communication mode, the signal processor 60 is used for controlling the states of the beam control board 30 and the servo control unit 71, and the signal processor 60 is connected with the switch 76 through a network so as to be in bidirectional communication with a computer.
As shown in fig. 4, the signal processor 60 is composed of a three-pulse compression unit, a clutter suppression unit, a quality control unit, and a spectrum distance estimation unit, wherein long, medium, and short three-pulse signals enter the input end of the three-pulse compression unit, the output end of the three-pulse compression unit is connected in series with the clutter suppression unit, the clutter suppression unit is connected in series with the spectrum distance estimation unit, the spectrum distance estimation unit is connected in series with the quality control unit, the signals are connected with the input end of the computer through a network port, and a Z/V/W product is output.
The transceiver module 10 includes eight four-channel transceiver modules, each of the eight four-channel transceiver modules is configured to output a transmission signal divided by the power dividing/combining network 20 to the waveguide line source, and each of the eight four-channel transceiver modules is configured to receive an echo signal from the waveguide line source, and each of the eight four-channel transceiver modules is connected to the power dividing/combining network 20, the beam control board 30, and the switch amplification attenuation module 40.
Each four-channel transceiver module includes four transceiver modules, each transceiver module is connected to a beam control board 30 and a power modulation board, the transceiver module 10 has a transceiver channel 32 in common, the power modulation board provides power signals for the transceiver module, the beam control board 30 provides control signals for the transceiver module, and the power dividing/combining network 20 provides excitation signals for the transceiver module.
As shown in fig. 2, the switching amplification attenuation component 40 includes a modulation power amplifier 41, a digitally controlled attenuator 42, a first circulator 43, a first switch 44, and a second circulator 45, an input end of the modulation power amplifier 41 and an input end of the digitally controlled attenuator 42 are both connected to an output end of the receiver module 50, an output end of the modulation power amplifier 41 and an output end of the digitally controlled attenuator 42 are respectively connected to an input end of the first circulator 43 and an input end of the second circulator 45, an output end of the first circulator 43 and an output end of the second circulator 45 are both connected to an input end of the first switch 44, an output end of the first switch 44 is connected to an input end of the receiver module 50, and the other output end of the first circulator 43 and the other output end of the second circulator 45 are both connected to the calibration network.
The switch amplification attenuation component 40 is used for realizing the strength and speed calibration of the system, and the IN1 is connected with the transceiving channel 51 and receives the up-conversion signal of the transceiving channel 51; the IN2 is connected with the transceiving channel 51 and receives the test signal of the transceiving channel; SUM1 is connected to power splitting/combining network 20 to provide a modulated signal; SUM1 is connected to the calibration network to provide a calibration test signal; OUT1 is connected to the transmit receive path 51 and transmits its echo signal.
As shown in fig. 1, the receiver module 50 includes a transceiving channel 51, a digital receiver 52, a waveform generating unit 53 and a local oscillator unit 54, where the transceiving channel 51 is configured to perform up-conversion processing on a three-pulse signal from the waveform generating unit 53, and the transceiving channel 51 is further configured to output a three-pulse intermediate frequency signal echo signal to an input end of the digital receiver 52; the output end of the transceiving channel 51 is connected with the input end of the modulation power amplifier 41 and the input end of the numerical control attenuator 42 respectively, and the input end of the transceiving channel 51 is connected with the output end of the first switch 44; the digital receiver 52 is used for outputting a digital 1/Q signal to the signal processor 60, and the digital receiver 52 is connected with the signal processor 60 in a bidirectional communication way; the waveform generating unit 53 is used for generating a three-pulse signal, and the waveform generating unit 53 is connected with the signal processor 60 in a two-way communication manner; the output end of the local oscillation unit 54 outputs two local oscillation signals to the input end of the transceiving channel 51, and the output end of the local oscillation unit 54 outputs clock signals of 1GHz, 200MHz, and 80MHz to the input ends of the waveform generating unit 53, the digital receiver 52, and the signal processor 60, respectively.
The digital receiver 52 sends the 20MHz clock signal to the signal processor 60, the transceiving channel 51 includes a receiving channel and a transmitting channel, wherein the receiving channel includes an image rejection filter, a mixer, an intermediate frequency amplifying and filtering circuit, two mixers, an intermediate frequency filtering and amplifying circuit, etc., and down-converts the received echo signal to an intermediate frequency signal twice; the transmitting channel comprises an intermediate frequency amplifying circuit, a mixer, an intermediate frequency filtering and amplifying circuit, two mixers, a radio frequency filtering and amplifying circuit and the like, and the intermediate frequency signals output by the waveforms are up-converted to radio frequency signals twice. The local oscillator unit 54 generates a frequency converted first local oscillator signal, second local oscillator signal, sampling clock signal, signal processor clock, etc., required for the overall system operation.
The local oscillator unit 54 generates a clock signal, provides the clock signal to the first local oscillator signal and the second local oscillator signal of the transceiving channel 51, and the waveform generating unit 53 mainly generates three pulse signals of long, medium and short, sends the three pulse signals to the transceiving channel 51, and performs bidirectional communication with the signal processor 60; the receiving and transmitting channel 51 receives the waveform generated by the waveform generating unit 53 and sends the waveform to the switch amplification and attenuation component 40 after internal up-conversion, and the signal sent by the receiving switch amplification and attenuation component 40 is sent to the intermediate frequency digital receiver after internal down-conversion; the if digital receiver converts the if signal to a digital I/Q signal and is connected to the signal processor 60 via an optical fiber.
As shown in fig. 3, specifically, the waveform generating unit 53 includes a frequency divider 531, an FPGA controller 532, a first impedance transformer 533, a DDS chip 534, a second impedance transformer 535, a second switch 536, and a filter 537, the input end of the frequency divider 531 is connected to the output end of the local oscillator unit 54, the output end of the frequency divider 531 is connected to the input end of the FPGA controller 532, the FPGA controller 532 is in bidirectional communication connection with the signal processor 60, the output end of the FPGA controller 532 is respectively connected with the input ends of the DDS chip 534 and the second switch 536, the input terminal of the first impedance converter 533 is connected to the output terminal of the local oscillator unit 54, the output terminal of the first impedance converter 533 is connected to the input terminal of the filter 537 through the DDS chip 534, the second impedance converter 535, and the second switch 536 in sequence, the output end of the filter 537 outputs a three-pulse signal to the input end of the transceiving channel 51.
The first impedance transformer 533, the DDS chip 534, and the second impedance transformer 535 form a DDS generating circuit.
The FPGA controller 532 is model number EPCS64SI16 manufactured by ALTERA, USA, the first impedance transformer 533 is model number ETC1-1-13 manufactured by MACOM, USA, the second impedance transformer 535 is model number WBC1-1TLB manufactured by Coilcraft, USA, and the DDS chip 534 is model number AD9858 manufactured by Analog Devices, USA.
The turntable module 70 comprises a servo control unit 71, a driver 72, an encoder 73, a motor 74, a power supply unit 75, an exchanger 76 and a data processing and displaying unit 77, wherein the servo control unit 71 and the exchanger 76 are in bidirectional communication connection with the signal processor 60, the input end of the servo control unit 71 is connected with the output end of the encoder 73, the output end of the servo control unit 71 is connected with the input end of the driver 72, and the driver 72 is in bidirectional communication connection with the motor 74; the switch 76 is in bidirectional communication connection with the data processing and display unit 77, and the power supply unit 75 respectively supplies power to the servo control unit 71, the switch 76, the transceiving component module 10, the beam control board 30, the receiver module 50, and the signal processor 60.
Specifically, the dc servo system is composed of a servo control unit 71, a driver 72, an encoder 73, and a motor 74, and a power supply unit 75 provides power; the encoder 73 provides position information; a driver 72 for control information; the signal processor 60 communicates status and control bi-directionally, and the driver 72 controls turntable speed and position information.
As shown in fig. 5, the waveform generating unit 53 generates the required three-pulse signal, and the long pulse 140MHz, the middle pulse 155MHz and the short pulse 125MHz can be seen on the frequency spectrum. After the signal processing of the radar system, the segmented blind repairing is carried out, the effect is shown in fig. 6, the crosstalk between pulses can be effectively inhibited, the efficiency of a transmitting-receiving assembly can be exerted to the maximum extent, the blind repairing splicing point is smoother, and the blind area problem of the all-solid-state radar is effectively solved.
The invention also provides a working method of the pitching electric scanning weather radar system, which comprises the following steps:
when the weather radar system transmits signals, the waveform generating unit 53 generates three pulse signals, and sends the three pulse signals to the input end of the transceiving channel 51, the transceiving channel 51 performs up-conversion processing on the three pulse signals to obtain up-conversion signals, and the up-conversion signal is sent to the input end of the switch amplification attenuation component 40, the up-conversion signal is modulated and amplified by the switch amplification attenuation component 40 and then sent to the input end of the power dividing/synthesizing network 20, the power dividing/synthesizing network 20 divides the up-conversion signal into eight paths of signals to be respectively sent to eight four-channel receiving and transmitting assemblies for further amplification, the beam control board 30 controls the transmitting phase shift codes, the receiving phase shift codes and the receiving attenuation codes of the eight four-channel receiving and transmitting assemblies through 422 serial ports, the eight four-channel receiving and transmitting assemblies respectively output four paths of transmitting signals to a waveguide line source, and the waveguide line source forms transmitting beams in space;
the wave beam control board 30 controls 6-bit transmitting phase shift data, 6-bit receiving amplitude attenuation data, a receiving and transmitting switch signal and a time sequence conversion signal to be transmitted to the 32-path receiving and transmitting assembly in real time; and simultaneously, the +8.5V, +5V, -5V power supply required by the transceiving component is provided.
When the weather radar system receives signals, the waveguide line source sends received echo signals to eight four-channel transceiving components for amplification, eight the four-channel transceiving components send the amplified echo signals to the power dividing/synthesizing network 20, the power dividing/synthesizing network 20 synthesizes the amplified echo signals and sends the synthesized echo signals to the input end of the switch amplification and attenuation component 40, the switch amplification and attenuation component 40 sends the synthesized echo signals to the transceiving channel 51 for down-conversion processing, the transceiving channel 51 outputs three-pulse intermediate frequency signal echo signals to the input end of the digital receiver 52, the digital receiver 52 sends the three-pulse intermediate frequency signal echo signals to the signal processor 60, the signal processor 60 performs pulse compression, clutter suppression, noise suppression and noise suppression on the received three-pulse intermediate frequency signal echo signals, And (4) spectral distance estimation and quality control, and echo intensity and speed information received by the weather radar system are output through a network.
In conclusion, the system can effectively inhibit crosstalk among pulses, enables a blind-patch joint to be smoother, can exert the efficiency of a receiving and transmitting assembly to the maximum extent, effectively utilizes the repetition frequency, and effectively solves the problem of the blind area of the all-solid-state radar; the scanning time of an individual can be shortened to be within 1 minute from 6 minutes, the high-density scanning area can be rapidly monitored in a high-efficiency real-time mode, the fine structure of a cloud and rain target can be obtained, and high space-time resolution is provided.
Claims (4)
1. A every single move weather radar system that electrically sweeps characterized in that: comprises a transceiving component module (10), a power dividing/synthesizing network (20), a beam control panel (30), a switch amplification attenuation component (40), a receiver module (50), a signal processor (60) and a turntable module (70), wherein,
the receiving and transmitting component module (10) is used for outputting the transmitting signals subjected to power division by the power division/synthesis network (20) to the waveguide line source and forming transmitting beams by the waveguide line source; the receiving and transmitting component module (10) is also used for receiving echo signals from the waveguide line source, and the receiving and transmitting component module (10) is respectively connected with the power dividing/synthesizing network (20), the beam control panel (30) and the switch amplification attenuation component (40);
the power dividing/synthesizing network (20) is used for power dividing the transmission signal from the switch amplification attenuation component (40), sending the power divided transmission signal to the input end of the transceiving component module (10), receiving and synthesizing the echo signal amplified by the transceiving component module (10), and sending the synthesized echo signal to the input end of the switch amplification attenuation component (40);
the beam control board (30) is used for outputting control signals to the input end of the transceiving component module (10), and the beam control board (30) is in bidirectional communication connection with the signal processor (60);
the switch amplification and attenuation component (40) is used for modulating and amplifying the up-conversion signal from the receiver module (50), sending the synthesized echo signal of the power division/synthesis network (20) to the input end of the receiver module (50), and outputting the modulated and amplified echo signal to the input end of the receiver module (50); the switch amplification attenuation component (40) is connected with the waveguide line source through a correction network;
a receiver module (50) in bidirectional communication with the signal processor (60);
the signal processor (60) is used for outputting the echo intensity and speed information received by the weather radar system and is in bidirectional communication connection with the turntable module (70);
the receiving and transmitting assembly module (10) comprises eight four-channel receiving and transmitting assemblies, wherein the eight four-channel receiving and transmitting assemblies are used for outputting transmitting signals subjected to power division by the power division/synthesis network (20) to the waveguide line source, the eight four-channel receiving and transmitting assemblies are used for receiving echo signals from the waveguide line source, and the eight four-channel receiving and transmitting assemblies are connected with the power division/synthesis network (20), the beam control plate (30) and the switch amplification attenuation assembly (40);
the switch amplification attenuation component (40) comprises a modulation power amplifier (41), a numerical control attenuator (42), a first circulator (43), a first switch (44) and a second circulator (45), wherein the input end of the modulation power amplifier (41) and the input end of the numerical control attenuator (42) are connected with the output end of the receiver module (50), the output end of the modulation power amplifier (41) and the output end of the numerical control attenuator (42) are respectively connected with the input end of the first circulator (43) and the input end of the second circulator (45), one output end of the first circulator (43) and one output end of the second circulator (45) are respectively connected with the input end of the first switch (44), the output end of the first switch (44) is connected with the input end of the receiver module (50), and the other output end of the first circulator (43), The other output ends of the second circulators (45) are connected with the correction network;
the receiver module (50) comprises a transceiving channel (51), a digital receiver (52), a waveform generation unit (53) and a local oscillation unit (54), wherein,
the transceiving channel (51) is used for carrying out up-conversion processing on the three-pulse signal from the waveform generating unit (53), and the transceiving channel (51) is also used for outputting a three-pulse intermediate frequency signal echo signal to the input end of the digital receiver (52); the output end of the transceiving channel (51) is respectively connected with the input end of the modulation power amplifier (41) and the input end of the numerical control attenuator (42), and the input end of the transceiving channel (51) is connected with the output end of the first switch (44);
the digital receiver (52) is used for outputting the digital 1/Q signals to the signal processor (60), and the digital receiver (52) is in bidirectional communication connection with the signal processor (60);
the waveform generating unit (53) is used for generating a three-pulse signal, and the waveform generating unit (53) is connected with the signal processor (60) in a two-way communication mode;
the output end of the local oscillator unit (54) outputs two local oscillator signals to the input end of the transceiving channel (51), and the output end of the local oscillator unit (54) respectively outputs clock signals of 1GHz, 200MHz and 80MHz to the input ends of the waveform generating unit (53), the digital receiver (52) and the signal processor (60);
the waveform generating unit (53) comprises a frequency divider (531), an FPGA controller (532), a first impedance converter (533), a DDS chip (534), a second impedance converter (535), a second switch (536) and a filter (537), wherein the input end of the frequency divider (531) is connected with the output end of the local oscillator unit (54), the output end of the frequency divider (531) is connected with the input end of the FPGA controller (532), the FPGA controller (532) is in bidirectional communication connection with the signal processor (60), the output end of the FPGA controller (532) is respectively connected with the input ends of the DDS chip (534) and the second switch (536), the input end of the first impedance converter (533) is connected with the output end of the local oscillator unit (54), and the output end of the first impedance converter (533) is connected with the input end of the filter (537) sequentially through the DDS chip (534), the second impedance converter (535) and the second switch (536), the output end of the filter (537) outputs a three-pulse signal to the input end of the transceiving channel (51);
the waveform generating unit (53) generates three pulse signals, wherein the long pulse is 140MHz, the middle pulse is 155MHz, and the short pulse is 125 MHz.
2. A pitch electrical scanning weather radar system as claimed in claim 1, wherein: the rotary table module (70) comprises a servo control unit (71), a driver (72), an encoder (73), a motor (74), a power supply unit (75), an exchanger (76) and a data processing and displaying unit (77), wherein the servo control unit (71) and the exchanger (76) are in bidirectional communication connection with the signal processor (60), the input end of the servo control unit (71) is connected with the output end of the encoder (73), the output end of the servo control unit (71) is connected with the input end of the driver (72), and the driver (72) is in bidirectional communication connection with the motor (74); the switch (76) is in bidirectional communication connection with the data processing and display unit (77), and the power supply unit (75) is used for supplying power to the servo control unit (71), the switch (76), the transceiving component module (10), the beam control panel (30), the receiver module (50) and the signal processor (60) respectively.
3. A pitch electrical scanning weather radar system as claimed in claim 1, wherein: the FPGA controller (532) is of an EPCS64SI16 model, the first impedance converter (533) is of an ETC1-1-13 model, the second impedance converter (535) is of a WBC1-1TLB model, and the DDS chip (534) is of an AD9858 model.
4. A method of operating a luffing weather radar system according to any one of claims 1 to 3, comprising the steps of:
when a weather radar system transmits signals, a waveform generating unit (53) generates three-pulse signals, the three-pulse signals are sent to the input end of a transceiving channel (51), the transceiving channel (51) performs up-conversion processing on the three-pulse signals to obtain up-conversion signals, the up-conversion signals are sent to the input end of a switch amplification attenuation component (40), the up-conversion signals are modulated and amplified by the switch amplification attenuation component (40) and then sent to the input end of a power division/synthesis network (20), the power division/synthesis network (20) divides the up-conversion signals into eight paths of signals and sends the eight paths of signals to eight four-channel transceiving components for further amplification, a beam control board (30) controls the transmitting phase shift codes, the receiving phase shift codes and the receiving attenuation codes of the eight four-channel transceiving components through 422 serial ports, the eight four-channel transceiving components respectively output four-path transmitting signals to a waveguide line source, the waveguide line source forms a transmitting beam in space;
when a weather radar system receives signals, a waveguide line source sends received echo signals to eight four-channel transceiving components for amplification, eight four-channel transceiving components send the amplified echo signals to a power dividing/synthesizing network (20), the power dividing/synthesizing network (20) synthesizes the amplified echo signals and sends the synthesized echo signals to an input end of a switch amplification and attenuation component (40), the switch amplification and attenuation component (40) sends the synthesized echo signals to a transceiving channel (51) for down-conversion processing, the transceiving channel (51) outputs tri-pulse intermediate-frequency signal echo signals to an input end of a digital receiver (52), the digital receiver (52) sends the tri-pulse intermediate-frequency signal echo signals to a signal processor (60), and the signal processor (60) pulse-compresses the received tri-pulse intermediate-frequency signal echo signals, Clutter suppression, spectral distance estimation and quality control, and echo intensity and speed information received by a weather radar system are output through a network.
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