CN104330801A - 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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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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, especially a kind of active phased array Weather radar system based on digital array.
Background technology
Detect in the various modes of the earth atmosphere of oneself depending on for existence people, weather radar occupies very consequence, relative to other detection means, weather radar has high spatial and temporal resolution, can promptly and accurately detect diastrous weather, be particularly highly effective observation instrument in the monitoring of Small and Medium Sized diastrous weather and short-time weather forecasting etc.
The China New Generation Weather Radar that China has arranged net at present substantially increases monitoring to diastrous weather and pre-alerting ability, can the information such as quantitative detection rainfall runoff process intensity, radial velocity, speed spectrum width, diastrous weather is become, particularly the very effective instrument in aspect such as mesoscale diastrous weather monitoring and warning with its high-spatial and temporal resolution, remote sensing ability promptly and accurately.But the change due to convection weather phenomenon is very fast, the development time yardstick of convection cell sometimes with regard to a few minutes by tens minutes, especially for strong convection monomers such as storms, a few minutes monomer situation just may change a lot.Current Doppler weather radar need to improve and realizes small scale, and the short change of time remaining is fast and cause the weather phenomenon of larger harm effectively to observe, and its main cause is that the radar detection cycle is long, radar detection temporal resolution is low.
The research of the phased array weather radar that China is relevant at present is still in the starting stage.Because the scanning system of phased-array radar is different from normal radar, the rapid scanning of phased array weather radar can make us have a better understanding to the generation of Small and Medium Sized synoptic process, development and 3-D solid structure and dynamic structure.Therefore, can affirm that phased-array technique is an important direction of future weather radar development, the research that the phased-array technique for digital array is applied to the implementation method of weather radar also has important realistic meaning.
Summary of the invention
The object of the present invention is to provide a kind of active phased array Weather radar system based on digital array with antenna beam rapid scanning ability, space power synthesis ability and Multibeam synthesis ability.
For achieving the above object, present invention employs following technical scheme: a kind of active phased array Weather radar system based on digital array, comprise for launching beam, received beam and the signal processor that echo data is processed, signal processor by network respectively with monitor terminal, Product Terminal both-way communication, signal processor is connected with the first high-speed high capacity division multiplex fibre-optic communication wave machine by the first optical fiber, first high-speed high capacity division multiplex fibre-optic communication wave machine is connected with the second high-speed high capacity division multiplex fibre-optic communication wave machine by the second optical fiber, collector ring is set on the second optical fiber, second high-speed high capacity division multiplex fibre-optic communication wave machine respectively with correction extension set, digital array module both-way communication, digital array module is connected with aerial array by corrective network, frequency source is respectively to digital array module, signal processor provides clock signal, the output terminal of servo drive motor respectively with collector ring, aerial array is connected.
Described signal processor is made up of Digital Beam Formation Unit and Doppler's meteorologic signal processor, described Doppler's meteorologic signal processor is by pulse compression unit, FFT converter unit, frequency domain filtering unit, IIR filter unit, DVIP unit and providing data formatting unit composition, Digital Beam Formation Unit and the first optical fiber bidirectional communication, Digital Beam Formation Unit divides two-way to export, one tunnel is directly connected with monitor terminal, another road is connected with the input end of pulse compression unit, the output terminal of pulse compression unit respectively with FFT converter unit, the input end of IIR filter unit is connected, FFT converter unit and frequency domain filtering units in series, IIR filter unit and DVIP units in series, frequency domain filtering unit, the output terminal of DVIP unit is all connected with the input end of providing data formatting unit, the output terminal of providing data formatting unit is connected with the input end of Product Terminal.
Described digital array module is made up of 8 digital array modular units, each digital array module unit is made up of 16 digital transmitting-receiving subassemblies, described digital transmitting-receiving subassembly comprises Waveform generating circuit, its output terminal successively with the first filtering and amplifying circuit, receive the first up-conversion of the second local oscillation signal, second filtering and amplifying circuit, receive the second up-conversion of the first local oscillation signal, first wave filter, power amplifier is connected, the output terminal of power amplifier is connected with the input end of circulator, circulator and aerial array both-way communication, the output terminal of circulator successively with isolation amplitude limit low noise amplifier, second wave filter, receive the first down coversion of the first local oscillation signal, 3rd filtering and amplifying circuit, receive the second down coversion of the second local oscillation signal, 4th filtering and amplifying circuit is connected, the output terminal of the 4th filtering and amplifying circuit is connected with the input end of digital receiver.
Described frequency source comprises 100MHz crystal oscillator, the input end that its output terminal produces circuit with the first phaselocked loop, the second phaselocked loop with reference signal is respectively connected, the output terminal of the first phaselocked loop is connected with the input end of frequency multiplier, frequency multiplier exports the input end of the first local oscillation signal to a 1:8 power splitter, and the output terminal of a 1:8 power splitter is connected with digital array module; The output terminal of the second phaselocked loop exports the input end of the second local oscillation signal to the 2nd 1:8 power splitter, and the output terminal of the 2nd 1:8 power splitter is connected with digital array module; Described reference signal produces circuit by power division network 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 adopts waveguide, and corrective network integrally and between 128 antennas of composition aerial array passes through Flange joint.
The beam signal that described aerial array transmits opens the form transmission of the row ripple battle array of rake joist with Narrow Wall of Waveguide limit, aerial array adopts slotted waveguide linear array.
Described correction extension set is made up of numerical-control attenuator and correction transmitting-receiving subassembly, both-way communication between numerical-control attenuator and correction transmitting-receiving subassembly, and numerical-control attenuator is connected with corrective network, corrects transmitting-receiving subassembly and signal processor both-way communication.
As shown from the above technical solution, this present invention adopts distributed transmitting-receiving subassembly to replace traditional single transmit machine single-receiver structure, improves the functional reliability of radar, reduces the overall life cycle cost of radar; High-performance, highly reliable, high motor-driven, adopt electricity to sweep and replace traditional mechanical scanning, wave beam flexibility and changeability, receive simultaneous multiple beams, sweep velocity is fast, system can realize multiple-working mode work, and an individual flyback time can be shortened within 1 minute from 6 minutes, spatial and temporal resolution is high; Have employed active digital TR assembly, transmitting-receiving DBF system, wave beam controls flexibly, to use different mode of operations, to different position, different target observation requirements strong adaptability for dissimilar weather target; This radar, based on the digital array system of advanced person, adopts the advanced technologies such as ultralow side lobe Waveguide slot planar array antenna, direct digital synthesizers (DDS) waveform generation, digital pulse-compression, fast erecting/unmarshaling, networking terminal; Radar automaticity is high, and adopt fixed north and electric leveling technology automatically, it is short that the time torn open by frame; Radar system dynamic range is large, and meanwhile, in machine, calibration facility enforcement automatic Calibration can guarantee the accuracy that systematic quantification is measured; Volume is little, lightweight, compact conformation, connects, be not only applicable to vehicular platform, can also extend to multiple workbench, as airborne platform, balloon floating platform etc. without feeder network cable.
Accompanying drawing explanation
Fig. 1 is circuit system block diagram of the present invention.
Fig. 2,3,4 is respectively the circuit block diagram of digital transmitting-receiving subassembly in Fig. 1, signal processor, frequency source.
Embodiment
A kind of active phased array Weather radar system based on digital array, comprise for launching beam, received 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 is connected with the first high-speed high capacity division multiplex fibre-optic communication wave machine by the first optical fiber, first high-speed high capacity division multiplex fibre-optic communication wave machine is connected with the second high-speed high capacity division multiplex fibre-optic communication wave machine by the second optical fiber, collector ring is set on the second optical fiber, second high-speed high capacity division multiplex fibre-optic communication wave machine respectively with correction extension set 2, digital array module 3 both-way communication, digital array module 3 is connected with aerial array 5 by corrective network 4, frequency source 6 is respectively to digital array module 3, signal processor 1 provides clock signal, the output terminal of servo drive motor respectively with collector ring, aerial array 5 is connected, as shown in Figure 1.Data processing terminal is made up of monitor terminal and Product Terminal two parts, complete following major function: radar control, data acquisition, radar data process, product generation, product file and echo, system monitoring, system has the ability of external network service, can realize multi-beam display.
As shown in Figure 1, described corrective network 4 is made up of main feeder 42 and 128 dual directional couplers 41, and main feeder 42 adopts waveguide, and corrective network 4 integrally and between 128 antennas 51 of composition aerial array 5 passes through Flange joint.The beam signal that described aerial array 5 transmits opens the form transmission of the row ripple battle array of rake joist with Narrow Wall of Waveguide limit, aerial array 5 adopts slotted waveguide linear array.When transmitting, pumping signal phase shift, up-conversion, amplification are fed to waveguide battle array input end by digital transmitting-receiving subassembly 31, radiofrequency signal is radiated space and forms required launching beam by slotted waveguide linear array, during reception, slotted waveguide linear array will receive target echo signal feeding digital transmitting-receiving subassembly 31 thereafter, and the digital signal that digital transmitting-receiving subassembly 31 exports is sent into Digital Beam Formation Unit 11 and formed required received beam.Described correction extension set 2 is made up of numerical-control attenuator and correction transmitting-receiving subassembly, both-way communication between numerical-control attenuator and correction transmitting-receiving subassembly, and numerical-control attenuator is connected with corrective network 4, corrects transmitting-receiving subassembly and signal processor 1 both-way communication.
As shown in Figure 2, described digital array module 3 is made up of 8 digital array modular units, each digital array module unit is made up of 16 digital transmitting-receiving subassemblies 31, described digital transmitting-receiving subassembly 31 comprises Waveform generating circuit, its output terminal successively with the first filtering and amplifying circuit, receive the first up-conversion of the second local oscillation signal, second filtering and amplifying circuit, receive the second up-conversion of the first local oscillation signal, first wave filter, power amplifier is connected, the output terminal of power amplifier is connected with the input end of circulator, circulator and aerial array 5 both-way communication, the output terminal of circulator successively with isolation amplitude limit low noise amplifier, second wave filter, receive the first down coversion of the first local oscillation signal, 3rd filtering and amplifying circuit, receive the second down coversion of the second local oscillation signal, 4th filtering and amplifying circuit is connected, the output terminal of the 4th filtering and amplifying circuit is connected with the input end of digital receiver.Digital array module unit comprises 16 identical transceiver channels, and each transceiver channel has independent transmission-receiving function; Pumping signal phase shift, up-conversion, amplification are fed into waveguide battle array input end by digital transmitting-receiving subassembly 31, radiofrequency signal is radiated space and forms required launching beam by slotted waveguide linear array, slotted waveguide linear array sends into digital transmitting-receiving subassembly 31 thereafter after receiving target echo signal, the digital signal that digital transmitting-receiving subassembly 31 exports is sent into Digital Beam Formation Unit 11 and formed required received beam.By controlling the relevant parameter of Waveform generating circuit DDS in digital transmitting-receiving subassembly 31, just can realize vertical plane figuration and sweeping mutually with various one dimension, thus realize this radar multiple-working mode.
Fig. 2 divides upper and lower two passages, when transmitting, first produce 50MHz intermediate-freuqncy signal by the Waveform generating circuit of lower channel, through the first filtering and amplifying circuit amplification filtering, an intermediate-freuqncy signal of 1.27GHz is become through the first up-conversion frequency conversion with the second local oscillator mixing of 1.22GHz, one intermediate-freuqncy signal is carried out after amplification filtering through the second filtering and amplifying circuit again, the radiofrequency signal of 9.37GHz is up-converted to the first local oscillation signal mixing second of 8.1GHz, radiofrequency signal is amplified by circulator arrival aerial array 5 through power amplifier through the first filter filtering again, by aerial array 5, the radiofrequency signal of 9.37GHz is radiated space.When Received signal strength, the electromagnetic wave signal that target reflects receives by aerial array 5, the isolation amplitude limit low noise amplifier of passage is above given by circulator, the first local oscillator mixing first through the second filter filtering and 8.1GHz down-converts to an intermediate-freuqncy signal of 1.27G H z, one intermediate-freuqncy signal is after the 3rd filtering and amplifying circuit filtering, two intermediate-freuqncy signals of 50MHz are down-converted to the second local oscillator mixing second of 1.22GHz, two intermediate-freuqncy signals are converted to discrete i/q signal through the digital receiver of intermediate frequency, export to next stage equipment.
As shown in Figure 3, described signal processor 1 is made up of Digital Beam Formation Unit 11 and Doppler's meteorologic signal processor 12, described Doppler's meteorologic signal processor 12 is by pulse compression unit, FFT converter unit, frequency domain filtering unit, IIR filter unit, DVIP unit and providing data formatting unit composition, Digital Beam Formation Unit 11 and the first optical fiber bidirectional communication, Digital Beam Formation Unit 11 points of two-way export, one tunnel is directly connected with monitor terminal, another road is connected with the input end of pulse compression unit, the output terminal of pulse compression unit respectively with FFT converter unit, the input end of IIR filter unit is connected, FFT converter unit and frequency domain filtering units in series, IIR filter unit and DVIP units in series, frequency domain filtering unit, the output terminal of DVIP unit is all connected with the input end of providing data formatting unit, the output terminal of providing data formatting unit is connected with the input end of Product Terminal.
As shown in Figure 3, first the i/q signal that the digital receiver of DAM in Fig. 2 is sent is carried out DBF digital beam froming, data after DBF divide two-way, one tunnel is that raw data is directly given monitor terminal and stored, and the advanced horizontal pulse compression in another road, carries out two kinds of process respectively to the signal through pulse pressure, the first is Fast Fourier Transform (FFT) FFT, time-domain signal is converted to frequency-region signal, spectral filter is carried out to frequency-region signal, then carry out composing the intensity, speed and the spectrum width that process and draw spectrum to spectrum; The second, for directly to carry out IIR filtering to time-domain signal, then carries out the process of DVIP video integration, directly obtains the intensity of signal; The result of these two kinds process gives Product Terminal through providing data formatting through netting twine.
As shown in Figure 4, described frequency source 6 comprises 100MHz crystal oscillator, the input end that its output terminal produces circuit with the first phaselocked loop, the second phaselocked loop with reference signal is respectively connected, the output terminal of the first phaselocked loop is connected with the input end of frequency multiplier, frequency multiplier exports the input end of the first local oscillation signal to a 1:8 power splitter, and the output terminal of a 1:8 power splitter is connected with digital array module 3; The output terminal of the second phaselocked loop exports the input end of the second local oscillation signal to the 2nd 1:8 power splitter, and the output terminal of the 2nd 1:8 power splitter is connected with digital array module 3; Described reference signal produces circuit by power division network clock signal respectively to digital array module 3, signal processor 1.Frequency source 6 is mainly digital array module 3 and provides the first local oscillation signal, the second local oscillation signal, digital receiver and the sampling clock needed for Waveform generating circuit and work clock.First local oscillation signal 8.1GHz, second local oscillation signal 1.22GHz, system reference clock 20MHz, AD sampling clock 40MHz, waveform generation clock 400MHz, must ensure that the 20MHz work clock of each digital array module unit is relevant and phase place of at every turn starting shooting is consistent simultaneously.
As shown in Figure 4, frequency source 6 provides sequential and the clock of standard for whole radar system, in order to ensure the strict coherent of signal sequence, the all sequential of radar is all produced by same 100MHz crystal oscillator, frequency source 6 mainly produces two kinds of signals: the first is local oscillation signal, is divided into 8 tunnel first local oscillation signals and 8 tunnel second local oscillation signals to give 8 DAM respectively; The second is reference signal, is sent to DDS respectively, i.e. Waveform generating circuit, as the work clock of DDS, and the sampling clock that the A/D sample circuit giving digital receiver 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.
The generation (source) that active phased array means emittance is on front, employing be active T/R assembly.Radiation power produces in T/R assembly, and the power signal that plurality of cells independently produces the distribution of phase with one another rule synthesizes at spatial coherence, produces directional beam.
Operationally, mission computer, namely control signal and running parameter are sent Digital Beam Formation Unit 11, i.e. DBF according to the mode of operation of detection demand by monitor terminal, and the function of Digital Beam Formation Unit 11 comprises launching beam and controls to be formed with received beam; When launching beam is formed, Digital Beam Formation Unit 11 send control word to arrive digital array module 3 by first and second optical fiber and first and second high-speed high capacity division multiplex fibre-optic communication wave machine and collector ring, digital array module 3 passes through Waveform generating circuit, i.e. DDS, realize launching phase shift, produce the intermediate-freuqncy signal of certain frequency, phase place, then amplify the antenna 51 exporting correspondence to, the launching beam of each array element radiation signal required for space combination through up-conversion, radio frequency.When received beam is formed, the signal that each array element of antenna 51 receives exports digital array module 3 to, the signal of reception is exported I/Q echoed signal by 128 road receiving cables after down coversion, DDC process, DDC process completes primarily of digital receiver, and i/q signal transfers to the signal processor 1 in 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 realize phased-array radar multiple-working mode neatly.The computing machine data acquisition of signal processor 1, providing data formatting, raw data exports Product Terminal to, and Product Terminal completes Meteorological Products according to the raw data that signal processor 1 is sent into and generates and display.Signal transmissions is digital signal substantially, and system is reliably highly stable, and the function of system can be recombinated as required.
In sum, present invention reduces the sending and receiving via net loss of the complicated feeder system of phased-array radar; Synthesize because power produces spatial coherence by the separate unit that distributes in a large number, therefore very high aerial radiation general power can be obtained; Reduce the resistance to power requirement of feeder system, simplify feeder system design; Have high system task reliability, bad several radiating element does not almost affect system works; Product composition is large quantity, distributed, in order to standardization and modular design, produces in batches and reduces costs; Optical fiber, photoelectron technology is facilitated to combine; Realize total digitalization and self-adaptation work, i.e. so-called " software radio " technology; Obtain more high dynamic range.
Claims (7)
1. the active phased array Weather radar system based on digital array, it is characterized in that: comprise for launching beam, received 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) is connected with the first high-speed high capacity division multiplex fibre-optic communication wave machine by the first optical fiber, first high-speed high capacity division multiplex fibre-optic communication wave machine is connected with the second high-speed high capacity division multiplex fibre-optic communication wave machine by the second optical fiber, collector ring is set on the second optical fiber, second high-speed high capacity division multiplex fibre-optic communication wave machine respectively with correction extension set (2), digital array module (3) both-way communication, digital array module (3) is connected with aerial array (5) by corrective network (4), frequency source (6) is respectively to digital array module (3), signal processor (1) provides clock signal, the output terminal of servo drive motor respectively with collector ring, aerial array (5) is connected.
2. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: described signal processor (1) is made up of Digital Beam Formation Unit (11) and Doppler's meteorologic signal processor (12), described Doppler's meteorologic signal processor (12) is by pulse compression unit, FFT converter unit, frequency domain filtering unit, IIR filter unit, DVIP unit and providing data formatting unit composition, Digital Beam Formation Unit (11) and the first optical fiber bidirectional communication, Digital Beam Formation Unit (11) point two-way exports, one tunnel is directly connected with monitor terminal, another road is connected with the input end of pulse compression unit, the output terminal of pulse compression unit respectively with FFT converter unit, the input end of IIR filter unit is connected, FFT converter unit and frequency domain filtering units in series, IIR filter unit and DVIP units in series, frequency domain filtering unit, the output terminal of DVIP unit is all connected with the input end of providing data formatting unit, the output terminal of providing data formatting unit is connected with the input end of Product Terminal.
3. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: described digital array module (3) is made up of 8 digital array modular units, each digital array module unit is made up of 16 digital transmitting-receiving subassemblies (31), described digital transmitting-receiving subassembly (31) comprises Waveform generating circuit, its output terminal successively with the first filtering and amplifying circuit, receive the first up-conversion of the second local oscillation signal, second filtering and amplifying circuit, receive the second up-conversion of the first local oscillation signal, first wave filter, power amplifier is connected, the output terminal of power amplifier is connected with the input end of circulator, circulator and aerial array (5) both-way communication, the output terminal of circulator successively with isolation amplitude limit low noise amplifier, second wave filter, receive the first down coversion of the first local oscillation signal, 3rd filtering and amplifying circuit, receive the second down coversion of the second local oscillation signal, 4th filtering and amplifying circuit is connected, the output terminal of the 4th filtering and amplifying circuit is connected with the input end of digital receiver.
4. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: described frequency source (6) comprises 100MHz crystal oscillator, the input end that its output terminal produces circuit with the first phaselocked loop, the second phaselocked loop with reference signal is respectively connected, the output terminal of the first phaselocked loop is connected with the input end of frequency multiplier, frequency multiplier exports the input end of the first local oscillation signal to a 1:8 power splitter, and the output terminal of a 1:8 power splitter is connected with digital array module (3); The output terminal of the second phaselocked loop exports the input end of the second local oscillation signal to the 2nd 1:8 power splitter, and the output terminal of the 2nd 1:8 power splitter is connected with digital array module (3); Described reference signal produces circuit by power division network clock signal respectively to digital array module (3), signal processor (1).
5. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: described corrective network (4) is made up of main feeder (42) and 128 dual directional couplers (41), main feeder (42) adopts waveguide, and corrective network (4) integrally and between 128 antennas (51) of composition aerial array (5) passes through Flange joint.
6. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: the beam signal that described aerial array (5) transmits opens the form transmission of the row ripple battle array of rake joist with Narrow Wall of Waveguide limit, aerial array (5) adopts slotted waveguide linear array.
7. the active phased array Weather radar system based on digital array according to claim 1, it is characterized in that: described correction extension set (2) is made up of numerical-control attenuator and correction transmitting-receiving subassembly, both-way communication between numerical-control attenuator and correction transmitting-receiving subassembly, numerical-control attenuator is connected with corrective network (4), corrects transmitting-receiving subassembly and signal processor (1) both-way communication.
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