CN1878378A - Multi-channel radio monitoring and correlation interference direction-finding fixed station system - Google Patents
Multi-channel radio monitoring and correlation interference direction-finding fixed station system Download PDFInfo
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- CN1878378A CN1878378A CNA200610088291XA CN200610088291A CN1878378A CN 1878378 A CN1878378 A CN 1878378A CN A200610088291X A CNA200610088291X A CN A200610088291XA CN 200610088291 A CN200610088291 A CN 200610088291A CN 1878378 A CN1878378 A CN 1878378A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
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Abstract
The invention relates to a multi signal channel wireless detection and relative interference direction detecting fixed station system. Wherein, it comprises a vertical polarized basic interferometer direction detecting antenna array, high-low electric screw switches, power distributor, the first antenna selector, three-function RF amplifier, dual-signal channel direction detecting receiver, digit middle-frequency phase detector, detecting direction detection processing unit, industrial control computer, low vertical polarizing detecting antenna, high vertical polarizing detecting antenna, the second antenna selector, detecting receiver, accumulator, UPS, environment detecting and remote-control power supply, concentrator, and network. The invention has the advantages that: one couple antenna units sample at the same time, to confirm synchronization, quick speed, and accuracy; and the amplifier has three functions as amplifying, directly through, and decreasing, which can be switched automatically, to expand the dynamic application range of receive signal, to avoid jam when receiving strong signal; and the detection and direction detection can be processed at the same time, with high direction detecting speed. The inventive system has high accuracy, sensitivity, speed, stability and reliability.
Description
Technical field
What the present invention relates to is multi-channel radio monitoring and correlation interference direction-finding fixed station system, belongs to the array signal digital processing direction finding technology field in the communication technology.
Background technology
What early stage monitoring and direction finding system adopted is the amplitude-comprised direction-finding system, and it is by comparing the signal amplitude size that each element antenna receives on the antenna array, coming the orientation of judgment signal.And this method is because to bear on every side the ability of abominable electromagnetic environment influence relatively poor, often occurs that the aspect judged is inaccurate, direction finding precision is not high, sensitivity is relatively poor, direction finding speed slow, is subject to phenomenon such as interference.Along with going deep into of radio spectrum management work, early stage monitoring equipment and monitoring technology can not adapt to the requirement of era development.For this reason, my company aims at world's advanced technology, has researched and developed multi-channel radio monitoring and correlation interferometer direction-finding fixed station system, takes the lead in having filled up domestic blank.
Summary of the invention
The objective of the invention is to defective, propose a kind of multi-channel radio monitoring and correlation interference direction-finding fixed station system, the radiocommunication signals of vertically polarized wave is monitored monitoring, direction finding location at early stage radio monitoring existence; To improve direction finding speed, raising monitoring and direction-finding precision and sensitivity, enhancing antijamming capability.
Technical solution of the present invention: its structure comprises the big basic interferometer direction finding antenna array of perpendicular polarization, high, the low side electricity pass of outwarding winding, power divider, first antenna selector, three function RF amplifiers, the double-channel direction-finding receiver, the digital intermediate frequency phase discriminator, the monitoring and direction-finding processing unit, industrial control computer, low side perpendicular polarization monitoring aerial, high-end perpendicular polarization monitoring aerial, second antenna selector, monitoring receiver, battery pack or civil power, UPS, environmental monitoring and remote circuit unit, hub, network.
Described monitoring receiver is used for radio monitoring, and the double-channel direction-finding receiver is used for direction-finding station, can carry out radio monitoring and direction finding simultaneously.
Advantage of the present invention: a pair of antenna element is sampled simultaneously, guarantees synchronous, quick, accurate.Carry out related operation by signal amplitude and phase information that antenna array is received, and the orientation of picked up signal, thereby improved direction finding precision and sensitivity, strengthened antijamming capability.Adopt the big basic direction estimation antenna array of wide aperture, solved the mutual coupling problem between each bay well, got rid of coupling and phase ambiguity between element antenna.Adopt the passive direction finding antenna, can avoid causing the distortion of correlation interferometer direction-finding antenna space phase characteristic curve because of the linear distortion of activated amplifier.Adopted have amplification, the amplifier of straight-through, three kinds of functions of decay, can automatically switch, enlarged the dynamic application scope of received signal, particularly when receiving strong signal, be not easy to produce obstruction because of signal is saturated.And monitoring and direction finding can carry out simultaneously, and direction finding speeds up.The system accuracy height, sensitivity is good, speed is fast, system stability, reliability height.
Description of drawings
Accompanying drawing 1 is an embodiment of the invention electricity theory diagram.
Used direction estimation antenna array schematic diagram in accompanying drawing 2 multichannels (or double-channel) radio monitoring and the correlation interferometer direction-finding fixed station system.
Accompanying drawing 3 three function RF amplifiers electricity theory diagram
Accompanying drawing 4 is that high and low end electricity is outwarded winding and closed electric principle schematic (outward winding with one group of electricity to close be example).
Accompanying drawing 5 is power dividers with 1: 2 distributor structured flowchart that is example.
Accompanying drawing 6 is structured flowcharts of environmental monitoring and remote circuit unit.
Accompanying drawing 7 is software control system flow charts of the present invention.
Among the figure 1 is big basic interferometer direction finding antenna array (perpendicular polarization), the 2nd, high, the low side electricity pass of outwarding winding, the 3rd, power divider, 4 is first antenna selectors, 5 is three function RF amplifiers, the 6th, the double-channel direction-finding receiver, the 7th, the digital intermediate frequency phase discriminator, the 8th, the monitoring and direction-finding processing unit, the 9th, industrial control computer, the 10th, low side perpendicular polarization monitoring aerial, 11 high-end perpendicular polarization monitoring aerials, 12 is second antenna selectors, the 13rd, monitoring receiver, the 14th, battery pack or civil power, the 15th, UPS, the 16th, environmental monitoring and remote circuit unit, the 17th, hub, the 18th, network, the 19th, lightning rod, 20 is five unit perpendicular polarization passive direction finding antenna array: 1350MHz-3000MHz, 21 is five unit perpendicular polarization passive direction finding antenna array: 500MHz-1350MHz, 22 is five unit perpendicular polarization passive direction finding antenna array: 160MHz-500MHz, 23 is five unit perpendicular polarization passive direction finding antenna array: 20MHz-160MHz.R
1, R
2, R
3Be resistance, C
1, C
2, C
3Be electric capacity, D
1-12Be that diode, V1-V7 are the voltage of monitoring and direction-finding controller output; The flow chart of software control system comprises monitoring and direction-finding service routine (dfNetServer) direction finding flow process and monitoring and direction-finding service routine (dfNetServer) operational process.
Embodiment
Contrast accompanying drawing 1, its structure comprise big basic perpendicular polarization interferometer direction finding antenna array 1, high and low end electricity outward winding close 2, power divider 3, first antenna selector 4, three function RF amplifiers 5, double-channel direction-finding receiver 6, digital intermediate frequency phase discriminator 7, monitoring and direction-finding processing unit 8, industrial control computer 9, low side perpendicular polarization monitoring aerial 10, high-end perpendicular polarization monitoring aerial 11, second antenna selector 12, monitoring receiver 13, battery pack or civil power 14, UPS15, environmental monitoring and remote circuit unit 16, hub 17, network 18.
Annexation between them: big basic perpendicular polarization interferometer direction finding antenna array 1, high and low end electricity are outwarded winding and are closed 2, first antenna selector 4, three function RF amplifiers 5, double-channel direction-finding receiver 6 serial connections; High and low end electricity outward winding close 2 output/go into end and power divider 3 input/going out end joins; First output of double-channel direction-finding receiver 6 and the input of digital intermediate frequency phase discriminator 7 join, and second output of double-channel direction-finding receiver 6 and the first input end of power divider 3 join; The first input end of the output of digital intermediate frequency phase discriminator 7 and industrial control computer 9 joins, first, second, third, fourth output of industrial control computer 9 respectively with second input of double-channel direction-finding receiver 6, the input of monitoring and direction-finding processing unit 8, the first input end of monitoring receiver 13, corresponding the joining of first input end of hub 17; The first, second, third, fourth, the 5th, the 6th output of monitoring and direction-finding processing unit 8 respectively with second input of power divider 3, second input of first antenna selector 4, second input of three function RF amplifiers 5, the 3rd input of double-channel direction-finding receiver 6, the 3rd input of second antenna selector 12, corresponding the joining of second input of monitoring receiver 13; The output of low side perpendicular polarization monitoring aerial 10, high-end perpendicular polarization monitoring aerial 11 respectively with corresponding joining of first, second input of second antenna selector 12; The 3rd input of the output of second antenna selector 12 and monitoring receiver 13 joins; Battery pack or civil power 14 are connected in series with UPS15, second input of UPS15 first output and industrial control computer 9 joins, UPS15 second output joins with environmental monitoring and remote circuit unit 16, second output of environmental monitoring and remote circuit unit 16 is connected in series with the input of second input of hub 17, network 18, the 3rd input of first output termination industrial control computer 9 of environmental monitoring and remote circuit unit 16.
The big basic interferometer direction finding antenna array 1 of described perpendicular polarization, be divided into four layers of arrangement (corresponding four frequency ranges), arrange along short transverse, every layer by five pairs of passive vertical dipole antennas composition circular array, whole direction estimation antenna array has 20 antenna oscillators, is used for received signal.Orlop is 20MHz～160MHz wave band, 3.0 meters of array maximum gauges, and the unit dipole is the longest 1.8 meters; Be 160MHz～500MHz wave band thereon, array diameter and dipole length all dwindle to some extent; Up be 500MHz～1350MHz wave band again, array diameter and dipole length further dwindle; The superiors are 1350MHz～3000MHz wave bands, and array diameter and dipole length dwindle again.Antenna impedance is 50 Ω.
High and low end electricity is outwarded winding, and to close 2 be to be divided into the low side electricity according to frequency range to outward winding and close unit and the high-end electricity unit, pass of outwarding winding.It is subjected to the control and the power supply of monitoring and direction-finding processor 8.
Its low and middle-end electricity operating frequency of closing unit (model is ANS 017L) of outwarding winding is 20MHz～1350MHz, it is equivalent to a high frequency electronic switch, it has 15 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part and 1 self-correcting signal output part, its controlled certain two paths of signals passage (being divided into main road, bypass) and self-correcting signalling channel of getting through simultaneously.
The high-end electricity operating frequency of closing the unit of outwarding winding is 1350MHz～3000MHz, model is ANS 018L, it also is a high frequency electronic switch, it has 5 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part, its controlled certain two paths of signals passage (being divided into main road, bypass) and self-correcting signalling channel of getting through simultaneously.Its operation principle: when control voltage V1, V2 power up diode D
1-3During conducting, just can pass to node A, when control voltage V2, V3 power up diode D from the signal that can move perpendicular polarization correlation interferometer direction-finding antenna array 1
4-6During conducting, the self-correcting signal just can pass to node A, when control voltage V4, V5 power up diode D
7-9During conducting, the signal of node A just can be exported from main road; When control voltage V6, V7 power up diode D
10-12During conducting, the signal of node A just can be exported (as shown in Figure 4) from auxiliary route;
Contrast accompanying drawing 5, power divider 3 comprises ALL 050L 1: 2+1: 1: 5 power divider two parts of 5 power dividers and ALL 051L.ALL 050L power divider is used for the frequency low side, be that the self-correcting signal that receiver produces is divided into two-way earlier, wherein one the tunnel is divided into 5 the tunnel again, introduce the low side electricity pass of outwarding winding, be used for the system of 20MHz～160MHz wave band or 160MHz～500MHz ripple or 500MHz～1350MHz wave band work is carried out self-correcting; Another road self-correcting signal is sent to high-end electricity and revolves in the switch enclosure, again behind 1: 5 power divider, delivers to high-frequency electrical and outwards winding and close the self-correcting that the unit is used for the high band system.
First antenna selector 4 is 4: 2 selectors, is used for outwarding winding from high-end electricity closing and the outward winding major-minor signal of 2 couple that closes output of low side electricity is chosen 1 pair of major-minor signal and exported.It has 4 inputs, 2 outputs and 1 control/feeder ear.
Three function RF amplifiers 5 are made up of two amplifiers, and operating frequency is 20MHz～3000MHz, have amplification, straight-through, three kinds of functions of decay, in use according to actual needs by software set.Two amplifiers are handled the main and side road signal from antenna selector 1 simultaneously.They respectively have 1 control/feeder ear, 1 input, 1 output.
This three function amplifier (as Fig. 3) is made up of first high frequency relay, second 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 first high frequency relay and second high frequency relay by software control.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 the second straight-through part output through high frequency relay.Be " amplification ".When first high frequency relay does not power up, and second high frequency relay is when powering up, and input signal arrives the attenuator circuit of second high frequency relay after the straight-through part of first high frequency relay, output after decaying.Be " decay ".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 " lead directly to, amplify, decay " three functions.
Double-channel direction-finding receiver 6 is that the major-minor signal of importing of two-way is carried out frequency conversion, demodulation, decoding, and output comprises the intermediate-freuqncy signal of signal phase and amplitude characteristic, arrives digital intermediate frequency phase discriminator 7 again and handles.Select the RR509A double-channel direction-finding receiver of Japanese Anritsu company in the present embodiment for use, its local vibration source of two channel sharings, phase equalization is good, thereby has guaranteed the high accuracy of correlation interferometer direction-finding system, and system sensitivity is very high, reliable and stable.
The major function of digital intermediate frequency phase discriminator 7 is that detection goes out the phase information in the signal phasor voltage, it (has two kinds of model: PSCQ-2-0.455 and PSCQ-2-21.4 by analog multiplier (model MC1596L), phase shifter, be respectively applied for 455KHz intermediate frequency and 21.4MHz intermediate-freuqncy signal handled) and amplifying circuit compositions such as (amplifier tube model wherein are C157C), intermediate-freuqncy signal from receiver is handled the phase information of output signal.Convert digital signal to by modulus (A/D) conversion again and offer computer.
Monitoring and direction-finding processor 8 (model is DFC 050L) is system's each several part control drive unit and dc power supply unit.Processor is by serial port and industrial control computer 9 (ADVANTECHIPC-610) communication, accept the control command of computer, control to power divider and high and low end electricity are outwarded winding pass, first antenna selector, three function RF amplifiers, double-channel direction-finding receiver, second antenna selector, monitoring receiver makes system monitor and direction finding radio signal according to software program.
Industrial control computer 9 (ADVANTECH IPC-610) is the carrier as application software, except executive program (comprise storage, print), also lot of data, audio frequency, video etc. are handled, it is by carrying out complicated statistic algorithm (as auto-correlation algorithm, phase detection algorithm, HILBERT conversion, fft algorithm) to the information data of a large amount of collections, thereby draws the orientation of signal.It has that the speed of service is fast, capacity is big, reliable and stable, can expand, characteristics such as anti-seismic performance is good.
Low side perpendicular polarization monitoring aerial 10 and high-end perpendicular polarization monitoring aerial 11 are the passive omnidirectional antenna of direction-free bipyramid in horizontal plane, and the low side operating frequency is 20MHz～700MHz, and high-end operating frequency is 500MHz～3000MHz.Input impedance: 50 Ω, the interface pattern is a N type socket.The low side antenna size is: diameter 1732mm; Height 1223mm.High-end antenna size is: diameter 250mm; Height 370mm.
Second antenna selector 12 is a kind of 2: 1 selectors, and it is therefrom chosen 1 road monitor signal and send into monitoring receiver 13 (model is RR511A) selecting from the signal of low side perpendicular polarization monitoring aerial 10 and high-end perpendicular polarization monitoring aerial 11.It has 2 signal input parts, 1 signal output part, 1 control end.
The monitor signal of 13 pairs of inputs of monitoring receiver carries out frequency conversion, demodulation, decoding, output comprises information such as signal frequency, amplitude, frequency deviation, percentage modulation bandwidth, level, spectral image, it can monitor measurement to the signal of different frequency domains, modulation domain, time domain by RS232 interface and computer communication.Select the RR511A single channel monitoring receiver of Japanese Anritsu company in the present embodiment for use.
Battery pack or civil power 14 comprise civil power 220VAC and batteries (8 joint 12V100AH).
UPS 15 is a uninterrupted power supply, and model is that APC 2200VA is online.
Contrast accompanying drawing 6, environmental monitoring and remote circuit unit 16, it (accepts control command to the system equipment power-on and power-off by the remote switch control module, computer resets, starting of air conditioner etc. are controlled), (AD that is used for on-the-spot 220VAC gathers data acquisition unit, fetch equipment power-on and power-off situation and voltage data etc.), (model is DS-6001HC to network video server, be used to transmit image scene), colour imagery shot (model is a Samsung 101), voltage sensor (model is DYH28-14A, is used for the 220V alternating current is converted into the alternating current of 5V), Temperature Humidity Sensor (model is JWSL-3W), smoke alarm (model is BT-168A), Infrared intrusion detector (model is BT-922R) etc. are partly formed.It links by NJ45 interface and hub 17, and hub joins with wire/wireless transmission network 18 again.Under control centre's software (DESCO DF7.0) effect, can carry out straighforward operation to long-range fixed station, comprise switching on and shutting down, receive that control centre's instruction is monitored, monitored, recording, direction finding or the location that crosses, and will monitor monitoring direction finding result and pass back to control centre.In addition, operating state, equipment connection status, the ambient condition of distant station are monitored, and by transmission link with Monitoring Data such as environment, operating states with by camera the image of telemonitoring is delivered to control centre and monitor.To in time report to the police if any unusual (containing theft, fire alarm etc.).
Claims (10)
1, multi-channel radio monitoring and correlation interference direction-finding fixed station system is characterized in that big basic perpendicular polarization interferometer direction finding antenna array, high and low end electricity outward winding pass, first antenna selector, three function RF amplifiers, double-channel direction-finding receiver serial connection; High and low end electricity outward winding the output of closing/go into end and power divider input/going out end joins; First output of double-channel direction-finding receiver and the input of digital intermediate frequency phase discriminator join, and second output of double-channel direction-finding receiver and the first input end of power divider join; The output of digital intermediate frequency phase discriminator and the first input end of industrial control computer join, first, second, third, fourth output of industrial control computer respectively with the first input end of double-channel direction-finding receiver, the input of monitoring and direction-finding processing unit, the first input end of monitoring receiver, corresponding the joining of second input of hub; The first, second, third, fourth, the 5th, the 6th output of monitoring and direction-finding processing unit respectively with second input of power divider, second input of first antenna selector, second input of three function RF amplifiers, the 3rd input of double-channel direction-finding receiver, the 3rd input of second antenna selector, corresponding the joining of second input of monitoring receiver; The output of low side perpendicular polarization monitoring aerial, high-end perpendicular polarization monitoring aerial respectively with corresponding joining of first, second input of second antenna selector; The 3rd input of the output of second antenna selector and monitoring receiver joins and connects; Battery pack or civil power are connected in series with UPS, second input of UPS first output and industrial control computer joins, the input of UPS second output and environmental monitoring and remote circuit unit joins, second output of environmental monitoring and remote circuit unit is connected in series with second input of hub, the input of network, the 3rd input of the first output termination industrial control computer of environmental monitoring and remote circuit unit.
2, multi-channel radio monitoring according to claim 1 and correlation interference direction-finding fixed station system, it is characterized in that the big basic interferometer direction finding antenna array of described perpendicular polarization, be divided into four layers of arrangement, corresponding four frequency ranges are arranged along short transverse, and every layer by five pairs of passive vertical dipole antennas composition circular array, whole direction estimation antenna array has 20 antenna oscillators, orlop is 20MHz～160MHz wave band, 3.0 meters of array maximum gauges, and the unit dipole is the longest 1.8 meters; Be 160MHz～500MHz wave band thereon, array diameter and dipole length all dwindle to some extent; Up be 500MHz～1350MHz wave band again, array diameter and dipole length further dwindle; The superiors are 1350MHz～3000MHz wave bands, and array diameter and dipole length dwindle again, and antenna impedance is 50 Ω.
3, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that outwarding winding high and low end electricity, to close be to be divided into the low side electricity according to frequency range to outward winding and close unit and the high-end electricity unit, pass of outwarding winding, its low and middle-end electricity operating frequency of closing the unit of outwarding winding is 20MHz～1350MHz, it has 15 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part and 1 self-correcting signal output part, its controlled certain two paths of signals passage of getting through simultaneously is divided into main road, bypass and self-correcting signalling channel; The high-end electricity operating frequency of closing the unit of outwarding winding is 1350MHz～3000MHz, it has 5 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part, its controlled certain two paths of signals passage of getting through simultaneously is divided into main road, bypass and self-correcting signalling channel.
4, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that power divider, comprise ALL 050L 1: 2+1: 1: 5 power divider two parts of 5 power dividers and ALL051L.
5, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that first antenna selector is a 4:2 selector, be used for outwarding winding from high-end electricity and close and the outward winding major-minor signal of 2 couple that closes output of low side electricity is chosen 1 pair of major-minor signal and exported, it has 4 inputs, 2 outputs and 1 control/feeder ear.
6, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that three function RF amplifiers, form by two amplifiers, operating frequency is 20MHz～3000MHz, and two amplifiers respectively have 1 control/feeder ear, 1 input, 1 output.
7,, it is characterized in that the digital intermediate frequency phase discriminator is made up of analog multiplier, phase shifter and amplifying circuit according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system.
8, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that low side perpendicular polarization monitoring aerial and high-end perpendicular polarization monitoring aerial are the passive omnidirectional antenna of direction-free bipyramid in horizontal plane, the low side operating frequency is 20MHz～700MHz, and high-end operating frequency is 500MHz～3000MHz.Input impedance: 50 Ω, the interface pattern is a N type socket; The low side antenna size is: diameter 1732mm; Height 1223mm; High-end antenna size is: diameter 250mm; Height 370mm.
9, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that second antenna selector is 2: 1 selectors, it is to selecting from the signal of low side perpendicular polarization monitoring aerial and high-end perpendicular polarization monitoring aerial, therefrom choose 1 road monitor signal and send into monitoring receiver, it has 2 signal input parts, 1 signal output part, 1 control end.
10, according to claims 1 described multi-channel radio monitoring and correlation interference direction-finding fixed station system, it is characterized in that environmental monitoring and remote circuit unit, it comprises remote switch control module, data acquisition unit, network video server, colour imagery shot, voltage sensor, Temperature Humidity Sensor, smoke alarm, Infrared intrusion detector.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363889A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Small-sized embedded radio monitoring and direction-finding station system |
| CN101350637B (en) * | 2008-09-05 | 2012-06-27 | 清华大学 | Networking method for two-channel wireless sensing terminal based on Zigbee |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2161024Y (en) * | 1993-05-17 | 1994-04-06 | 刘原 | Integrated console for radio monitoring |
| US5956648A (en) * | 1997-03-12 | 1999-09-21 | G/Tracker Technologies Llc | Trunked radio monitoring system |
| CN1471194A (en) * | 2003-07-02 | 2004-01-28 | 中国电子科技集团公司第五十四研究所 | Folding direction-finding communication line antenna apparatus |
| CN100353775C (en) * | 2003-10-16 | 2007-12-05 | 华为技术有限公司 | on site testing equipment and method of mobile communication system |
| CN200959643Y (en) * | 2006-07-10 | 2007-10-10 | 俞文蕴 | Multi-channel wireless monitor and related interferent direction-finding fixed station apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350637B (en) * | 2008-09-05 | 2012-06-27 | 清华大学 | Networking method for two-channel wireless sensing terminal based on Zigbee |
| CN101363889A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Small-sized embedded radio monitoring and direction-finding station system |
| CN101363889B (en) * | 2008-09-10 | 2011-05-25 | 俞惟铨 | Small-sized embedded radio monitoring and direction-finding station system |
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Assignee: Nanjing Developing Electronic System Co., Ltd. Assignor: Yu Wenyun Contract record no.: 2011320000166 Denomination of invention: Multi-channel radio monitoring and correlation interference direction-finding fixed station system Granted publication date: 20080618 License type: Exclusive License Open date: 20061213 Record date: 20110307 |
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Granted publication date: 20080618 Termination date: 20130710 |