CN102147456B - Maritime radio communication monitoring and direction finding system - Google Patents
Maritime radio communication monitoring and direction finding system Download PDFInfo
- Publication number
- CN102147456B CN102147456B CN2010106085679A CN201010608567A CN102147456B CN 102147456 B CN102147456 B CN 102147456B CN 2010106085679 A CN2010106085679 A CN 2010106085679A CN 201010608567 A CN201010608567 A CN 201010608567A CN 102147456 B CN102147456 B CN 102147456B
- Authority
- CN
- China
- Prior art keywords
- signal
- signal output
- signal input
- input part
- joins
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention relates to a maritime radio communication monitoring and direction finding system which is characterized by comprising a vertical polarization monitoring and direction finding antenna array, a five-channel signal switching module, an amplification module, a five-channel receiver, a digital signal processor (DSP) processing module, a computer, a monitoring and direction finding controller, a 3rd generation (3G) antenna, a radio station antenna, a 3G router, a digital broadcasting station, a switchboard, an electronic compass, a global positioning system (GSP) module and a GSP antenna. The maritime radio communication monitoring and direction finding system has the advantages that: an interfering signal can be monitored better due to the working frequencies ranging from 30 to 500MHz; simultaneous direction finding of several coherent waves is realized; simultaneous direction finding and ultrahigh-resolution digital direction finding of transmitting signals with same frequency and different directions are realized; direction finding of digital frequency hopping, a spread spectrum and a burst signal is realized; monitoring and measuring on different frequency domains, different time domains and different modulation domains can be simultaneously performed during measuring due to respective local oscillation of five channels; the problem of cross coupling among all antenna array elements is solved; the coupling and the phase ambiguity among unit antennas are removed; and dynamic application ranges of received signals are expanded.
Description
Technical field
What the present invention relates to is a kind of specialized narrowband waterborne (30MHz-500MHz) radio communication monitoring and direction finding system, belongs to the radio monitoring technical field.
Background technology
Along with the development of China's shipping cause and the quick growth of trade waterborne, the applied more and more of wireless device, the situation that the legitimate correspondence frequency that China's river coastal station uses is disturbed is more and more serious.Radio monitoring direction-finding system all is based on the continental rise platform that builds in the city basically both at home and abroad at present; Land wireless communication signals or broadcast television signal are carried out monitoring and direction-finding, and existing domestic and international radio monitoring and direction-finding equipment characteristic is one, frequency coverage is wide, system complex, cost an arm and a leg; Two, based on continental rise platform or vehicle-mounted, and ship-borne equipment has its special platform, and three-dimensional motion has improved technical requirement and difficulty to monitoring and direction-finding equipment; Three, the present monitoring and direction-finding equipment monitoring and direction finding system comprehensive integrated waterborne of not combining closely with electronic chart; Four, existing equipment adopts the multiple means networking in the wire/wireless, and monitoring equipment waterborne can only use data radio station communication and data transmission at land-based area far away, and the reliability of monitoring equipment networking, security, anti-interference and error correcting capability etc. require higher.Therefore existing radio monitoring and direction-finding equipment can not comprehensively satisfy the actual needs of relevant departments' radio monitoring task waterborne.Therefore need a monitoring and direction-finding of realizing wireless communication signal waterborne based on the radio monitoring direction-finding system waterborne of boat-carrying.
Summary of the invention
What the present invention proposed is a kind of radio monitoring direction-finding system of being absorbed in the direction finding of maritime radiocommunication signal monitoring.It is intended to comprehensively satisfy the actual needs of relevant departments' radio monitoring task waterborne; Can be used for reception, measurement, analysis, identification, monitoring, direction finding location, data processing and the transmission of radio signal, concrete function comprises: the processing of radio monitoring, radio direction finding (RDF), monitoring and direction-finding data and preservation, real-time signal analysis, nearly land-based area commander control function, nearly land-based area movements control center function.
Technical solution of the present invention: it is characterized in that first signal output part, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part of vertical polarization monitoring and direction-finding antenna array and five-way road signal handover module first signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road signal handover module, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and amplifier module, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of amplifier module, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and five-way road receiver, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road receiver, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and DSP processing module, the 5th signal input part is corresponding joins; The control end of first signal output part of monitoring and direction-finding controller and five-way road signal handover module joins; Second output terminal of monitoring and direction-finding controller and the control end of amplifier module join; The self-correcting signal input part of the self-correcting signal output part of five-way road receiver and five-way road signal handover module joins; First output terminal of the signal input part of monitoring and direction-finding controller and computing machine joins; First signal input part of the signal output part of DSP processing module and computing machine joins; The secondary signal output terminal of computing machine and the signal input part of switch join; The signal input part of the signal output part of gps antenna and GPS module joins; The secondary signal input end of the signal output part of GPS module and computing machine joins; The 3rd signal input part of the output terminal of electronic compass and computing machine joins; The first signal output/input end of switch and the signal I/O end of 3G router join, and the signal I/O end of the secondary signal output/input end of switch and data radio station joins, and the signal input part of the signal output part of 3G router and 3G antenna joins; The signal output part of the signal input part of data radio station and radio station antenna joins, corresponding the joining of signal I/O end of the signal output/input end of gps antenna and computing machine.
Advantage of the present invention: the operating frequency range of native system is 30MHz-500MHz, can better investigate and prosecute undesired signal; Adopt Estimation of Spatial Spectrum direction finding system, this system can realize several coherent wave simultaneous direction findings; Can realize simultaneous direction finding that same frequency, a plurality of different directions are transmitted; Realize digital super-resolution direction finding; To digital frequency hopping, spread spectrum, burst signal direction finding; During measurement, five passages are measured because of the monitoring that respectively has self local oscillator can measure different frequency domains, time domain and modulation domain simultaneously, are equivalent to five monitoring receivers, have strengthened the ability of spectrum management and monitoring greatly.In addition, native system adopts backoff algorithm, has well solved ship-borne equipment on the water because the monitoring and direction-finding difficult problem under the multifreedom motion condition.Therefore native system can be searched interference source more accurately, for relevant radio control department provides more sound radio monitoring direction-finding system equipment, gets rid of the interference of maritime radiocommunication frequency, purifies electromagnetic environment, safeguards marine communication navigation order.This system hardware ingredient 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; Adopt the light-duty passive correlation interferometer direction-finding antenna array of formula of moving, solved the mutual coupling problem between each bay well, got rid of coupling and phase ambiguity between element antenna; Adopted have amplification, the amplifier of straight-through, three kinds of functions of decay, enlarged the dynamic application scope that receives signal.
Description of drawings:
Accompanying drawing 1 is an embodiment of the invention electricity theory diagram.
Accompanying drawing 2 vertical polarization monitoring and direction-finding antenna synoptic diagram.
Accompanying drawing 3 five-way road signal handover module electrical schematic diagrams.
Accompanying drawing 4 amplifiers electricity theory diagram.
Accompanying drawing 5 monitoring and direction-finding controllers electricity theory diagram.
Accompanying drawing 6 is DSP processing module electricity theory diagrams.
Among the figure 1 is vertical polarization monitoring and direction-finding antenna array, the 2nd, five-way road signal handover module, the 3rd, amplifier module, the 4th, five-way road receiver, the 5th, DSP processing module, the 6th, computing machine, the 7th, monitoring and direction-finding controller, the 8th, 3G antenna, the 9th, radio station antenna, the 10th, 3G router, the 11st, data radio station, the 12nd, switch, the 13rd, power module, the 14th, electronic compass, the 15th, GPS module, the 16th, gps antenna.
Embodiment:
Contrast accompanying drawing 1, its structure are first signal output part, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part of vertical polarization monitoring and direction-finding antenna array 1 with first signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of five-way road signal handover module 2, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road signal handover module 2, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and amplifier module 3, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of amplifier module 3, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and five-way road receiver 4, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road receiver 4, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and DSP processing module 5, the 5th signal input part is corresponding joins; The control end of first signal output part of monitoring and direction-finding controller 7 and five-way road signal handover module 2 joins; Second output terminal of monitoring and direction-finding controller and the control end of amplifier module 3 join; The self-correcting signal input part of the self-correcting signal output part of five-way road receiver 4 and five-way road signal handover module 2 joins; First output terminal of the signal input part of monitoring and direction-finding controller 7 and computing machine 6 joins; First signal input part of the signal output part of DSP processing module 5 and computing machine 6 joins; The secondary signal output terminal of computing machine 6 and the signal input part of switch 12 join; The signal input part of the signal output part of gps antenna 16 and GPS module 15 joins; The secondary signal input end of the signal output part of GPS module 15 and computing machine 6 joins; The 3rd signal input part of the output terminal of electronic compass 14 and computing machine 6 joins; The first signal output/input end of switch 12 and the signal I/O end of 3G router one 0 join, and the signal I/O end of the secondary signal output/input end of switch 12 and data radio station 11 joins, and the signal input part of the signal output part of 3G router one 0 and 3G antenna 8 joins; The signal output part of the signal input part of data radio station 11 and radio station antenna 9 joins, corresponding the joining of signal I/O end of the signal output/input end of gps antenna 16 and computing machine 6.
Contrast accompanying drawing 2, its structure is a vertical polarization monitoring and direction-finding antenna array, is made up of five pairs of retractable passive Vertically Polarized Dipoles (diameter 16mm); Working frequency range is 30MHz～500MHz, launches the about 1500mm of array diameter during work; The about 800mm of unit dipole length, the upper end is equipped with lightning rod, and the antenna array overall height is 1600mm; Impedance is 50 Ω, and interface is a N type socket.
Contrast accompanying drawing 3, five-way road signal handover module 2, frequency of operation is 30MHz～500MHz, and 5 input ends, 5 output terminals, 1 self-correcting signal input part, 1 control end are arranged.Its principle of work be when monitoring and direction-finding controller control V1 add+the 12V electricity time, diode D1～D3 conducting, this road path of self-correcting signal input, the self-correcting signal can be exported from signal output part; Control V2 when the monitoring and direction-finding controller to add+when 12V is electric, diode D4～D6 conducting, this road path of aerial signal input, aerial signal can be exported from signal output part.
Contrast accompanying drawing 4, amplifier module comprises five broadband low noise three function amplifiers, frequency of operation is 30MHz～500MHz, 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 5 road signals.They respectively have 1 control/feeder ear, 1 input end, 1 output terminal.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, export through the decay back.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.
Five-way road receiver 4 carries out frequency conversion output digital medium-frequency signal to the received on-air radio electric signal of direction estimation antenna array, delivers to DSP module 5 again and handles.Select the digital five channel monitoring direction-finding receivers of J067 of Jiujiang City, Jiangxi Province 713 factories in the present embodiment for use, carry out the monitoring and the direction finding of space spectrum estimation ultra-resolution rate of five channels.It is made up of five plate card type receivers, adopts pci bus structure and modular design, and an integrated circuit board is exactly a receive channel, integrated circuit board be inserted in the PCI slot 19 " in the standard PC case, fix with press strip.When system during in direction finding, five channel receivers are worked simultaneously, shared same local vibration source, and phase equalization is good, has guaranteed the high precision of space spectrum estimation ultra-resolution rate direction-finding system.And when not direction finding of system; Can automatically switch to monitoring through 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.
Contrast accompanying drawing 5, the monitoring and direction-finding controller has 2 output terminals, 1 control end.First output terminal has 1 output interface, connects the control end of amplifier; Second output terminal has 5 output interfaces, connects the control end of Phase Processing device.1 control termination computing machine 6 is used for the steering order of receiving computer.Its principle of work be 5 output terminal output-12V ,+12V, 0V voltage come control amplifier between " decay, amplify, straight-through " three kinds of states, to switch; Come the control phase processor whether to carry out Phase Processing through the break-make of control+12V power supply.The monitoring and direction-finding controller mainly is made up of single-chip microcomputer, relay, and single-chip microcomputer receives the duty that corresponding pin output high-low level comes pilot relay after the instruction of upper computer software, thus realize output terminal-12V ,+the voltage output of 12V, 0V.
Contrast accompanying drawing 6; The DSP processing module is to handling from the digital medium-frequency signal of five-way road receiver 4; Comprise sampling, demodulation, decoding and A/D conversion etc., output comprises that information to computing machines 6 such as signal frequency, amplitude, frequency deviation, percentage modulation bandwidth, level handle.It mainly is made up of passage digitizing processing section, synchronized sampling clock signal generation veneer, backboard.Wherein passage digitizing processing section comprises 5 passages processing veneers and a synchronized sampling clock generation plate, and major function provides the storage of synchronized sampling clock, data pre-service and the data of 5 passages and sends; Backboard is the motherboard of each veneer of communication digitizing processing section, is responsible for that each channel data is carried out frame and handles, carries out exchanges data with computing machine.
Computing machine 6 is industrial control computer (ADVANTECH IPC-610), it has, and travelling speed 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 routine (comprise storage, print); Also lot of data, audio frequency, video etc. are handled; It adopts advanced statistic algorithm---multiple signal classification (MUSIC) algorithm through the mass data information that receives from bay is handled, thereby draws the orientation of signal.In the direction finding of space spectrum estimation ultra-resolution rate, measure the signal voltage that institute might bay receives, produce measurement covariance matrix R, this matrix is used for differentiating the cochannel component of reception signal.The process of MUSIC algorithm is to calculate covariance matrix R earlier, R is carried out feature decomposition obtain its eigenwert and proper vector.Can confirm the quantity of signal source according to eigenwert, utilize the signal subspace formed by proper vector and the orthogonality relation of noise subspace, two sub spaces are carried out proper process, confirm the arrival bearing of radio signal.Insert orientation values in super-resolution direction-finding uses and calculate a plurality of position angles, this value basis generates with the bearing calibration vector that the signal subspace of measuring covariance matrix R production matees most.
Claims (3)
1. radio communication monitoring and direction finding system waterborne, it is characterized in that first signal output part, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part of vertical polarization monitoring and direction-finding antenna array and five-way road signal handover module first signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road signal handover module, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and amplifier module, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of amplifier module, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and five-way road receiver, the 5th signal input part is corresponding joins; First signal input part, secondary signal input end, the 3rd signal input part, the 4th signal input part of first signal output part of five-way road receiver, secondary signal output terminal, the 3rd signal output part, the 4th signal output part, the 5th signal output part and DSP processing module, the 5th signal input part is corresponding joins; The control end of first signal output part of monitoring and direction-finding controller and five-way road signal handover module joins; Second output terminal of monitoring and direction-finding controller and the control end of amplifier module join; The self-correcting signal input part of the self-correcting signal output part of five-way road receiver and five-way road signal handover module joins; First output terminal of the signal input part of monitoring and direction-finding controller and computing machine joins; First signal input part of the signal output part of DSP processing module and computing machine joins; The secondary signal output terminal of computing machine and the signal input part of switch join; The signal input part of the signal output part of gps antenna and GPS module joins; The secondary signal input end of the signal output part of GPS module and computing machine joins; The 3rd signal input part of the output terminal of electronic compass and computing machine joins; The first signal output/input end of switch and the signal I/O end of 3G router join, and the signal I/O end of the secondary signal output/input end of switch and data radio station joins, and the signal input part of the signal output part of 3G router and 3G antenna joins; The signal output part of the signal input part of data radio station and radio station antenna joins, corresponding the joining of signal I/O end of the signal output/input end of gps antenna and computing machine.
2. radio communication monitoring and direction finding system waterborne according to claim 1 is characterized in that vertical polarization monitoring and direction-finding antenna array, by five pairs of retractable passive Vertically Polarized Dipoles; Diameter 16mm forms, and working frequency range is 30MHz～500MHz, launches during work; The about 1500mm of array diameter, the about 800mm of unit dipole length, the upper end is equipped with lightning rod; The antenna array overall height is 1600mm, and impedance is 50 Ω, and interface is a N type socket.
3. radio communication monitoring and direction finding system waterborne according to claim 1; It is characterized in that five-way road signal handover module (2); Frequency of operation is 30MHz～500MHz; Inside is made up of a SPL-1/5 power divider, 5 combiners, and 5 input ends, 5 output terminals, 1 self-correcting signal input part, 1 control end are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106085679A CN102147456B (en) | 2010-12-27 | 2010-12-27 | Maritime radio communication monitoring and direction finding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106085679A CN102147456B (en) | 2010-12-27 | 2010-12-27 | Maritime radio communication monitoring and direction finding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102147456A CN102147456A (en) | 2011-08-10 |
| CN102147456B true CN102147456B (en) | 2012-11-21 |
Family
ID=44421824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106085679A Expired - Fee Related CN102147456B (en) | 2010-12-27 | 2010-12-27 | Maritime radio communication monitoring and direction finding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102147456B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759004A (en) * | 2016-03-01 | 2016-07-13 | 江健良 | Water environment monitoring system capable of positioning |
| CN108964803B (en) * | 2018-07-06 | 2021-07-02 | 南京新兴空间电子系统有限公司 | Radio frequency spectrum monitoring device based on unmanned monitoring ship |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038333A (en) * | 2007-04-13 | 2007-09-19 | 北京工业大学 | Doppler wireless direction finding method |
| CN101363890A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Dual polarization 5-channel radio monitoring and super-resolution direction-finding fixation station system |
| CN101363889A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Small-sized embedded radio monitoring and direction-finding station system |
| CN101363892A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Radio monitoring and electronic interference integration system |
| CN101363891A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Wide-band 5-channel radio monitoring and super-resolution direction-finding mobile station system |
| CN101363888A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Shipborne maritime wireless communication monitoring system |
| CN201919000U (en) * | 2010-12-27 | 2011-08-03 | 南京新兴电子系统有限公司 | Water wireless communication monitoring and direction finding system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0300352D0 (en) * | 2003-01-08 | 2003-02-05 | Secr Defence | Radio signal direction finder |
-
2010
- 2010-12-27 CN CN2010106085679A patent/CN102147456B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038333A (en) * | 2007-04-13 | 2007-09-19 | 北京工业大学 | Doppler wireless direction finding method |
| CN101363890A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Dual polarization 5-channel radio monitoring and super-resolution direction-finding fixation station system |
| CN101363889A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Small-sized embedded radio monitoring and direction-finding station system |
| CN101363892A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Radio monitoring and electronic interference integration system |
| CN101363891A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Wide-band 5-channel radio monitoring and super-resolution direction-finding mobile station system |
| CN101363888A (en) * | 2008-09-10 | 2009-02-11 | 俞惟铨 | Shipborne maritime wireless communication monitoring system |
| CN201919000U (en) * | 2010-12-27 | 2011-08-03 | 南京新兴电子系统有限公司 | Water wireless communication monitoring and direction finding system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102147456A (en) | 2011-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108832728B (en) | Wireless energy transmission system and method based on direction backtracking antenna | |
| CN103828270B (en) | Based on the channel calibration method of antenna-feedback system, device and base station | |
| CN1877357B (en) | Superwide frequency band radio communication monitoring and direction finding system | |
| CN101363891B (en) | Wide-band 5-channel radio monitoring and super-resolution direction-finding mobile station system | |
| CN103634060A (en) | Real-time radio collaborative monitoring, detecting and locating method | |
| CN110913466A (en) | Ultra-wideband UWB positioning system and method based on multi-communication fusion | |
| CN102075266B (en) | Nine-channel spatial spectrum estimation super-resolution monitoring direction-finding fixed station system | |
| CN102147456B (en) | Maritime radio communication monitoring and direction finding system | |
| CN201919000U (en) | Water wireless communication monitoring and direction finding system | |
| CN103675765B (en) | High-frequency software radio receiving system | |
| CN201285420Y (en) | Bi-polarized five channel radio monitoring and super-resolution direction-finding fixed station system | |
| CN102109593B (en) | Nine-channel space spectrum super-resolution estimation monitoring and direction-finding mobile station system | |
| CN211554155U (en) | Short wave antenna gain measurement system | |
| CN100387086C (en) | Multi-channel radio monitoring and correlation interference direction-finding mobile station system | |
| Tsankov et al. | Analyzing Possible Network Solutions for loT Communication Protocols and their Applications in Smart Farming | |
| CN101363890B (en) | Dual polarization 5-channel radio monitoring and super-resolution direction-finding fixation station system | |
| CN101363888A (en) | Shipborne maritime wireless communication monitoring system | |
| CN201285421Y (en) | Broadband five channel radio monitoring and super-resolution direction-finding mobile station system | |
| CN100396140C (en) | Multi-channel radio monitoring and correlation interference direction-finding fixed station system | |
| CN202059420U (en) | Nine-channel spatial spectrum estimation super-resolution monitoring direction-finding mobile station system | |
| CN203984429U (en) | The remote optical fiber radio frequency covering system of the mixed signal of standing altogether | |
| CN206851044U (en) | A kind of practical multi signal TDOA alignment systems | |
| CN201285418Y (en) | Unmanned helicopter-mounted aerial frequency spectrum monitoring system | |
| CN202059419U (en) | Nine-channel spatial spectrum estimation super-resolution monitoring direction finding fixed station system | |
| CN200959643Y (en) | Multi-channel wireless monitor and related interferent direction-finding fixed station apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20201227 |