CN102075266A - Nine-channel spatial spectrum estimation super-resolution monitoring direction-finding fixed station system - Google Patents
Nine-channel spatial spectrum estimation super-resolution monitoring direction-finding fixed station system Download PDFInfo
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Abstract
The invention discloses a nine-channel spatial spectrum estimation super-resolution monitoring direction-finding fixed station system, which is characterized by comprising a small biconical omnibearing monitoring antenna, a nine-unit direction-finding antenna array, two functional amplifiers, a monopole monitoring antenna, a nine-channel signal switching module, a filtering combiner, an amplifier module, a nine-channel receiver, a monitoring direct-finding controller, a digital signal processor (DSP) processing module, an embedded industrial personal computer, a global positioning system (GPS) antenna, a GPS module, a 3rd generation (3G) antenna, a 3G route, a power supply module, a continuous power supply module, a remote control unit and a switchboard which are shown in a figure in the specifications. The system has the advantage that: resolution and interception of a same-frequency multi-point transmitted signal can be solved. Coherent signals caused by a plurality of paths can be distinguished under a certain condition and can be widely applied to radio direction finding in a complex electromagnetic environment. A spatial spectrum system has high multipath effect resistance, high sensitivity, high monitoring and direction finding speeds and high accuracy, and can be used for quickly capturing various digital frequency hopping, frequency spreading and frequency hopping and spreading signals.
Description
Technical field
What the present invention relates to is a kind of nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system, belongs to the radio monitoring technical field.
Background technology
Along with developing rapidly of radio cause, Radio Spectrum Resource day is becoming tight, and the radio interference incident also increases day by day, and it is also more and more important to search interference source by direction-finding station.We find that many signals while monitoring and direction-findings have proposed new challenge to radio monitoring and direction-finding in practice.For example, we often run into the telex network of being disturbed and do not allow to interrupt (as communication and navigation frequency, the public correspondence on airport) in radio control, and the situation of using many base station equipment (as paging, honeycomb public correspondence net), and when same frequency occurred multiple spot simultaneously and transmits, conventional direction finding technology was difficult to differentiate.
Summary of the invention
The objective of the invention is at the problems referred to above, propose nine channel radio monitorings and super-resolution direction-finding fixation station system.The wide aperture DF antenna system of proposition employing Unit nine, nine channels are with frequency/alien frequencies receiver, the space spectrum estimation ultra-resolution rate direction finding technology of uses advanced and DSP Digital Signal Processing are realized high-resolution direction finding to the radio signal of the radiocommunication signals of vertically polarized wave and horizontal polarized wave by advanced person's statistic algorithm (MUSIC Multiple Signal Classification method).
Technical solution of the present invention: it is characterized in that the signal output part of little bipyramid omnidirectional monitoring aerial and the signal input part of two function amplifiers join, first signal input part of the signal output part of two function amplifiers and filtering mixer joins, the secondary signal input of filtering mixer and the signal output part of monopole monitoring aerial join, the monitor signal input of the signal output part of filtering mixer and nine channel signal handover modules joins, corresponding the joining of direction-finding signal output of the direction-finding signal input of nine channel signal handover modules and nine unit direction estimation antenna array, first signal output part of the control end of nine channel signal handover modules and monitoring and direction-finding controller joins, the self-correcting signal output part of the self-correcting signal input part of nine channel signal handover modules and nine passage receivers joins, first signal input part of the signal output part of nine channel signal handover modules and amplifier module joins, the signal output part of amplifier module connects the signal input part of nine passage receivers, the secondary signal output of the control end of amplifier module and monitoring and direction-finding controller joins, the signal input part of the signal output part of nine passage receivers and DSP processing module joins, the signal I/O end of DSP processing module and built-in industrial control machine first signal output/input is corresponding joins, the signal input part of the signal output part of built-in industrial control machine and monitoring and direction-finding controller joins, first corresponding the joining of signal I/O end of the secondary signal output/input of built-in industrial control machine and switch, the secondary signal I/O end of switch and corresponding the joining of signal output/input of 3G router, the 3rd signal I/O end of switch and corresponding the joining of signal output/input of remote control unit, the signal output of power module is joined with the signal input part of uninterruption power source module, the signal output part of uninterruption power source module and the signal input part of remote control unit join, first signal input part of the signal output part of remote control unit and built-in industrial control machine joins, the secondary signal input of built-in industrial control machine and the signal output part of GPS module join, the signal input part of GPS module and the signal output part of gps antenna join, and the signal output part of the signal input part of 3G router and 3G antenna joins.
Advantage of the present invention: system has realized the long-range of radio signal and automatic monitoring direction finding; This system adopts Estimation of Spatial Spectrum direction finding system, and this system can realize several coherent wave simultaneous direction findings; Can realize in the cochannel, simultaneous a plurality of signals, simultaneous direction finding; Can realize the super-resolution direction finding; Only need signal sampling seldom, just accurately direction finding, thereby be applicable to the Frequency Hopping Signal direction finding; High direction finder sensitivity and high direction finding accuracy can be realized, therefore interference source can be searched more accurately; This system hardware part adopts comprehensive integrated design, intermediate-freuqncy signal DSP technology and modular combination, and configuration is succinct practical; Built-in embedded computer system, compact conformation is light; Direction estimation antenna array has solved the mutual coupling problem between each bay well, has got rid of coupling and phase ambiguity between element antenna; Monitoring aerial with two function amplifiers, filtering close the road mixer, little bipyramid omnidirectional monitoring aerial is integrated in the radome, compact conformation is light, sets up easy to maintenance; Adopted have amplification, the amplifier of straight-through, three kinds of functions of decay, enlarged the dynamic application scope of received signal; Networking flexibility can be supported multiple wire/radio network data security transmission; Can realize the function such as collection, compressed encoding, autotask monitoring, statistical analysis, differential mode warning of radio signal.Can solve the resolution and the intercepting and capturing that transmit with the frequency multiple spot.Can distinguish under certain conditions because the coherent signal that multipath causes can be widely used in the direction-finding station under the complex electromagnetic environment.Spatial spectrum system anti-multipath effect capability is strong, highly sensitive, monitoring and direction-finding speed is fast, precision is high, can catch various digital frequency hoppings, spread spectrum, jumping spread-spectrum signal fast.
Description of drawings:
Accompanying drawing 1 is an embodiment of the invention electricity theory diagram.
Accompanying drawing 2 is filtering mixer electrical schematic diagrams.
Accompanying drawing 3 is uninterruption power source module electricity theory diagrams.
Accompanying drawing 4 is remote control unit electricity theory diagrams.
Accompanying drawing 5 is nine unit direction estimation antenna array schematic diagrames.
Accompanying drawing 6 is DSP processing module electricity theory diagrams.
Accompanying drawing 7 is nine channel signal handover module electrical schematic diagrams.
Among the figure 1 is little bipyramid omnidirectional's monitoring aerial (300-3000M), 2 is nine unit direction estimation antenna array, 3 is two function amplifiers, the 4th, monopole monitoring aerial (30-300M), 5 is nine channel signal handover modules, the 6th, the filtering mixer, the 7th, amplifier module, 8 is nine passage receivers, the 9th, the monitoring and direction-finding controller, the 10th, the DSP processing module, the 11st, built-in industrial control machine, the 12nd, gps antenna, the 13rd, the GPS module, the 14th, the 3G antenna, the 15th, the 3G route, the 16th, power module, the 17th, the uninterruption power source module, the 18th, remote control unit, the 19th, switch.
Embodiment:
Contrast accompanying drawing 1, its structure is that the signal output part of little bipyramid omnidirectional monitoring aerial 1 and the signal input part of two function amplifiers 3 join, first signal input part of the signal output part of two function amplifiers 3 and filtering mixer 6 joins, the secondary signal input of filtering mixer 6 and the signal output part of monopole monitoring aerial 4 join, the monitor signal input of the signal output part of filtering mixer 6 and nine channel signal handover modules 5 joins, corresponding the joining of direction-finding signal output of the direction-finding signal input of nine channel signal handover modules 5 and nine unit direction estimation antenna array 2, first signal output part of the control end of nine channel signal handover modules 5 and monitoring and direction-finding controller 9 joins, the self-correcting signal output part of the self-correcting signal input part of nine channel signal handover modules 5 and nine passage receivers 8 joins, first signal input part of the signal output part of nine channel signal handover modules 5 and amplifier module 7 joins, the signal output part of amplifier module 7 connects the signal input part of nine passage receivers 8, the secondary signal output that the control end of amplifier module 7 and monitoring and direction-finding are controlled 9 devices joins, the signal input part of the signal output part of nine passage receivers 8 and DSP processing module 10 joins, the signal I/O end of DSP processing module 10 and built-in industrial control machine 11 first signal output/input is corresponding joins, the signal input part of the signal output part of built-in industrial control machine 11 and monitoring and direction-finding controller 9 joins, first corresponding the joining of signal I/O end of the secondary signal output/input of built-in industrial control machine 11 and switch 19, the secondary signal I/O end of switch 19 and corresponding the joining of signal output/input of 3G router one 5, the 3rd signal I/O end of switch 19 and corresponding the joining of signal output/input of remote control unit 18, the signal output of power module 16 is joined with the signal input part of uninterruption power source module 17, the signal input part of the signal output part of uninterruption power source module 17 and remote control unit 18 joins, first signal input part of the signal output part of remote control unit 18 and built-in industrial control machine 11 joins, the secondary signal input of built-in industrial control machine 11 and the signal output part of GPS module 13 join, the signal output part of the signal input part of GPS module 13 and gps antenna 12 joins, and the signal output part of the signal input part of 3G router one 5 and 3G antenna 14 joins.
Little bipyramid omnidirectional monitoring aerial 1, operating frequency is 300MHz～3000MHz, for a kind of in horizontal plane direction-free active bipyramid omnidirectional antenna.Be of a size of: base diameter 248mm; Height 318mm.Input impedance: 50 Ω, the interface pattern is a N type socket.
Nine unit direction estimation antenna array 2 are divided into three layers of arrangement (corresponding three frequency ranges), arrange along short transverse, form circular array by the active vertical dipole antenna in Unit nine for every layer, whole perpendicular polarization interferometer direction finding antenna array has 27 antenna oscillators, is used for received signal.Orlop is that (the unit dipole is the longest 1.8 meters for 20MHz～200MHz), 3.0 meters of array maximum gauges for A band; Be that (200MHz～1000MHz), array diameter and dipole length all dwindle the B wave band to some extent thereon; The superiors are that (1000MHz～3000MHz), array diameter and dipole length dwindle C-band again.Antenna impedance is 50 Ω, and total height (containing lightning rod) is 4.8m.As shown in Figure 5.
The operating frequency of two function amplifiers 3 is 30MHz～1300MHz, has amplification, straight-through two kinds of functions.Handle coming from childhood the signal of bipyramid omnidirectional monitoring aerial.It has 1 control/feeder ear, 1 input, 1 output.Amplifier is made up of first high frequency relay, second high frequency relay, amplifying circuit and power supply, the amplifier tube (model ERA-51SM) in high frequency relay (model RF303-12), the amplifier.+ 12V power supply is added to respectively on first high frequency relay and second high frequency relay.When first high frequency relay powers up, and second high frequency relay is not when powering up, and input signal obtains linear amplification behind amplifying circuit, again through the straight-through part output of second high frequency relay.Be " amplification ".When first high frequency relay and second high frequency relay did not power up, input signal was through the straight-through part output of first high frequency relay and second high frequency relay.Be " leading directly to ".So this amplifier has " straight-through, amplification two functions.
Active monopole monitoring aerial 4, operating frequency are 20MHz～300MHz, input impedance: 50 Ω, the interface pattern is a N type socket.
The operating frequency of nine channel signal handover modules 5 is 30MHz～3000MHz, to handling from the direction-finding signal of nine unit direction estimation antenna array, the monitor signal of filtering mixer.Form by self-correcting merit parallel circuit, commutation circuit.It has 3 groups of direction-finding signal inputs, and every group has 9 interfaces, and 3 of nine unit direction estimation antenna array 2 layers of antenna correspondence are joined respectively; 9 output interfaces are arranged, with nine corresponding joining of input interface of nine passage receivers 8; 1 self-correcting signal input interface is arranged, with corresponding the joining of self-correcting signal output interface of nine passage receivers 8; 1 monitor signal input interface is arranged, with corresponding the joining of output of filtering mixer; 1 control interface is arranged, join, be used for carrying out the switching of each road signal with 9 second output of monitoring and direction-finding controller.Contrast Fig. 6, when its operation principle was direction finding, V1, V4 powered on, diode D1～D3, D7～D9 conducting, the self-correcting signal is exported from signal output part, V2, when V4 powers on.Diode D4～D9 conducting, direction-finding signal is exported from signal output part; During monitoring, V3, V4 power on, diode D7～D12 conducting, and monitor signal is exported from signal output part.As shown in Figure 7.
The operating frequency of filtering mixer 6 is 30MHz～3000MHz, to handling from the signal of amplifier and monopole monitoring aerial, it has two interfaces, connect the output of amplifier and the output of monopole antenna respectively, handled range of signal is 300MHz～3000MHz and 30MHz～300MHz two segment signals, and every segment signal adds low pass and high pass filter respectively, and its two segment signal is independent of each other, export from the output of mixer afterwards, as shown in Figure 2.
Amplifier module 7 comprises nine broadband low noise three function amplifiers, and operating frequency is 30MHz～3000MHz, has amplification, straight-through, three kinds of functions of decay, in use according to actual needs by software set.Respectively to handling from Phase Processing device module 9 road signals.They respectively have 1 control/feeder ear, 1 input, 1 output.Amplifier is made up of A high frequency relay, B high frequency relay, amplifying circuit, attenuator circuit and power supply, the amplifier tube (model ERA-51SM) in high frequency relay (model RF303-12), the amplifier.+ 12V power supply is added to respectively on A high frequency relay and the B high frequency relay by software control.When the A high frequency relay powers up, and the B high frequency relay is not when powering up, and input signal obtains linear amplification behind amplifying circuit, again through the straight-through part output of B high frequency relay.Be " amplification ".When the A high frequency relay does not power up, and the B high frequency relay is when powering up, and input signal arrives the attenuator circuit of B high frequency relay after the straight-through part of A high frequency relay, output after decaying.Be " decay ".When A high frequency relay and B high frequency relay did not power up, input signal was through the straight-through part output of A high frequency relay and B high frequency relay.Be " leading directly to ".So this amplifier has " lead directly to, amplify, decay " three functions.
Nine passage receivers 8 carry out frequency conversion output digital medium-frequency signal to the received on-air radio signal of telecommunication of direction estimation antenna array, deliver to DSP module 10 again and handle.It is made up of nine plate card type receivers, adopts pci bus structure and modularized design, and an integrated circuit board is exactly a receive channel, and integrated circuit board is inserted in the standard PC case of PCI slot, fixes with press strip.When system during in direction finding, nine channel receivers are worked simultaneously, shared same local vibration source, and phase equalization is good, has guaranteed the high accuracy of space spectrum estimation ultra-resolution rate direction-finding system.And when not direction finding of system, can automatically switch to monitoring by software again and measure, carry out multichannel with the signal from the monitoring and direction-finding antenna array of opposing and handle respectively, the monitoring that adapts to different frequency domains, modulation domain, time domain is measured, really accomplish dual-use, make full use of resource.
Monitoring and direction-finding control 9, (model is DFC 050L) is system's each several part control drive unit and dc power supply unit.Processing module is accepted the control command of computer system by parallel port and computer system communication, implements the control to relevant unit, and system is monitored and direction finding radio signal according to software program.
DSP processing module 10, to handling from the digital medium-frequency signal of nine passage receivers 8, comprise sampling, demodulation, decoding and A/D conversion etc., output comprises that information to built-in industrial control machines 11 such as signal frequency, amplitude, frequency deviation, percentage modulation bandwidth, level handle.It mainly is made up of passage digitlization processing section, synchronized sampling clock signal generation veneer, backboard.Wherein passage digitlization processing section comprises 9 passages processing veneers and a synchronized sampling clock generation plate, and the storage that major function provides synchronized sampling clock, data preliminary treatment and the data of 9 passages sends; Backboard is the motherboard of each veneer of communication digitlization processing section, is responsible for that each channel data is carried out frame and handles, carries out exchanges data with computer.As shown in Figure 6.
Built-in industrial control machine 11 is industrial control computer (ADVANTECH IPC-610), it has, and the speed of service is fast, capacity is big, reliable and stable, can expand, characteristics such as anti-seismic performance is good.It is as the carrier of application software, except executive program (comprise storage, print), also lot of data, audio frequency, video etc. are handled, it is by handling the mass data information that receives from bay, adopt advanced statistic algorithm--multiple signal classification (MUSIC) algorithm, thereby draw the orientation of signal.In the direction finding of space spectrum estimation ultra-resolution rate, measure the signal voltage that institute might bay receives, production measurement covariance matrix R, this matrix is used for differentiating the cochannel component of received signal.The process of MUSIC algorithm is to calculate covariance matrix R earlier, R is carried out feature decomposition obtain its characteristic value and characteristic vector.Can determine the quantity of signal source according to characteristic value, utilize the signal subspace formed by characteristic vector and the orthogonality relation of noise subspace, two sub spaces are carried out suitable processing, determine the arrival bearing of radio signal.Super-resolution direction-finding uses the interpolation orientation values to calculate a plurality of azimuths, and this value generates according to the bearing calibration vector that the signal subspace with measurement covariance matrix R production mates most.
Power module 16 transfers the input of AC220V civil power to DC28V output, for system provides power supply.
Contrast accompanying drawing 3, uninterruption power source module 17 is made up of uninterruption power source plate, lithium battery, and its major function is under the situation of 220V civil power outage, and the zero-clearance that carries out civil power and lithium battery power supply switches; In addition, charging automatically under the situation of lithium battery quantity not sufficient.It has an input, an output.As shown in Figure 3.
Remote control unit 18, its function comprise that break-make, equipment working state monitoring, the monitoring of operational environment, the monitoring of supply voltage, the computer of remote control equipment power supply function such as restart.Contrast accompanying drawing 1, remote control unit is made up of control module, feedback module, communication module, monitoring modular, data acquisition module, several parts of power module and MCU unit.MCU selects for use the unit 89C51 single-chip microcomputer and I/O extended chip 8255 to form; Control module is made up of optocoupler, triode, relay, and the respective pin of MCU unit output high-low level is controlled the state that optocoupler, triode in the control module is operated in relay to switch on and off, and realizes controlled function.Feedback module and control module are joined, form by relay, optocoupler, diode, the output loop of the relay control in the feedback module connects the corresponding pin and the ground of MCU unit, input circuit connects the relay of control module, its operating state changes with the operating state of the relay in the control module, the MCU unit sends different data along with the difference of the relay operating state in the feedback module to upper computer software, thereby reaches the purpose of data and Working Status Monitoring.Communication module changes the network interface module by the Zhou Ligong serial ports to be formed, and model is ZNE-100PT, and major function is to transfer microcontroller serial port to network interface, communicates for single-chip microcomputer and host computer function software.Monitoring modular is made up of SHT11 humiture monitoring probe and 89C2051 single-chip microcomputer, is mainly used to temperature, humidity are monitored.Data acquisition module is by AD acquisition chip AD1674 and peripheral circuit, and major function is under the control of MCU, carries out the collection of operating voltage.The Switching Power Supply that power module adopts DC28V to change DC12V, DC-12V, DC5V is formed, and provides remote control unit required power supply.As shown in Figure 4.
Claims (6)
1. nine channel space are composed estimation ultra-resolution rate monitoring direction-finding fixed station system, it is characterized in that the signal output part of little bipyramid omnidirectional monitoring aerial and the signal input part of two function amplifiers join, first signal input part of the signal output part of two function amplifiers and filtering mixer joins, the secondary signal input of filtering mixer and the signal output part of monopole monitoring aerial join, the monitor signal input of the signal output part of filtering mixer and nine channel signal handover modules joins, corresponding the joining of direction-finding signal output of the direction-finding signal input of nine channel signal handover modules and nine unit direction estimation antenna array, first signal output part of the control end of nine channel signal handover modules and monitoring and direction-finding controller joins, the self-correcting signal output part of the self-correcting signal input part of nine channel signal handover modules and nine passage receivers joins, first signal input part of the signal output part of nine channel signal handover modules and amplifier module joins, the signal output part of amplifier module connects the signal input part of nine passage receivers, the secondary signal output of the control end of amplifier module and monitoring and direction-finding controller joins, the signal input part of the signal output part of nine passage receivers and DSP processing module joins, the signal I/O end of DSP processing module and built-in industrial control machine first signal output/input is corresponding joins, the signal input part of the signal output part of built-in industrial control machine and monitoring and direction-finding controller joins, first corresponding the joining of signal I/O end of the secondary signal output/input of built-in industrial control machine and switch, the secondary signal I/O end of switch and corresponding the joining of signal output/input of 3G router, the 3rd signal I/O end of switch and corresponding the joining of signal output/input of remote control unit, the signal output of power module is joined with the signal input part of uninterruption power source module, the signal output part of uninterruption power source module and the signal input part of remote control unit join, first signal input part of the signal output part of remote control unit and built-in industrial control machine joins, the secondary signal input of built-in industrial control machine and the signal output part of GPS module join, the signal input part of GPS module and the signal output part of gps antenna join, and the signal output part of the signal input part of 3G router and 3G antenna joins.
2. nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system according to claim 1, it is characterized in that little bipyramid omnidirectional monitoring aerial operating frequency is 300MHz～3000MHz, for a kind of in horizontal plane direction-free active bipyramid omnidirectional antenna, be of a size of: base diameter 248mm; Height 318mm, input impedance: 50 Ω, the interface pattern is a N type socket.
3. nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system according to claim 1, it is characterized in that nine unit direction estimation antenna array are divided into three layers of arrangement, corresponding three frequency ranges, arrange along short transverse, every layer by Unit nine active vertical dipole antenna composition circular array, whole perpendicular polarization interferometer direction finding antenna array has 27 antenna oscillators, be used for received signal, orlop is A band (20MHz～200MHz), 3.0 meters of array maximum gauges, the unit dipole is the longest 1.8 meters; Be that (200MHz～1000MHz), array diameter and dipole length all dwindle the B wave band to some extent on A band; Be that (1000MHz～3000MHz), array diameter and dipole length dwindle C-band again, and antenna impedance is 50 Ω, and it is 4.8m that total height contains lightning rod on the B wave band.
4. nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system according to claim 1 is characterized in that active monopole monitoring aerial, and operating frequency is 20MHz～300MHz, input impedance: 50 Ω, the interface pattern is a N type socket.
5. nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system according to claim 1, the operating frequency that it is characterized in that nine channel signal handover modules is 30MHz～3000MHz, to handling from the direction-finding signal of nine unit direction estimation antenna array, the monitor signal of filtering mixer, it has 3 groups of direction-finding signal inputs, every group has 9 interfaces, and 3 of nine unit direction estimation antenna array layers of antenna correspondence are joined respectively; 9 output interfaces are arranged, with nine corresponding joining of input interface of nine passage receivers; 1 self-correcting signal input interface is arranged, with corresponding the joining of self-correcting signal output interface of nine passage receivers; 1 monitor signal input interface is arranged, with corresponding the joining of output of filtering mixer; 1 control interface is arranged, with the monitoring and direction-finding controller second output join, be used for carrying out the switching of each road signal.
6. nine channel space spectrum estimation ultra-resolution rate monitoring direction-finding fixed station system according to claim 1, the operating frequency that it is characterized in that the filtering mixer is 30MHz～3000MHz, it has two interfaces, connect the output of amplifier and the output of monopole antenna respectively, handled range of signal is 300MHz～3000MHz and 30MHz～300MHz two segment signals, every segment signal adds low pass and high pass filter respectively, its two segment signal is independent of each other, exports from the output of mixer afterwards.
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| CN105024768A (en) * | 2015-08-18 | 2015-11-04 | 成都九华圆通科技发展有限公司 | Hand-held digital monitoring direction-finding system |
| CN106100765A (en) * | 2016-08-26 | 2016-11-09 | 成都华创电科信息技术有限公司 | Radio monitoring direction-finding system |
| CN106100766A (en) * | 2016-08-26 | 2016-11-09 | 成都华创电科信息技术有限公司 | Radio monitoring direction-finding system |
| CN106330356A (en) * | 2016-08-26 | 2017-01-11 | 成都华创电科信息技术有限公司 | Radio monitoring and direction finding system |
| CN112737626A (en) * | 2020-12-18 | 2021-04-30 | 中国电子科技集团公司第五十四研究所 | Broadband parallel receiving and processing device based on VPX bus |
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| CN105024768A (en) * | 2015-08-18 | 2015-11-04 | 成都九华圆通科技发展有限公司 | Hand-held digital monitoring direction-finding system |
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| CN102075266B (en) | 2014-03-26 |
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