CN101765247A - Roadway wireless video communication base station - Google Patents
Roadway wireless video communication base station Download PDFInfo
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- CN101765247A CN101765247A CN201010100911A CN201010100911A CN101765247A CN 101765247 A CN101765247 A CN 101765247A CN 201010100911 A CN201010100911 A CN 201010100911A CN 201010100911 A CN201010100911 A CN 201010100911A CN 101765247 A CN101765247 A CN 101765247A
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Abstract
A roadway wireless video communication base station relates to a roadway wireless video communication base suitable for underground and solves the problems that a communication line in a mining area is worn, smashed and broken and is hard to recover, and a video signal for communication transmission is interrupted due to slope changing points and roadway corners. The base station comprises a receiver (1), a changeover switch (2) and a transmitter (3), wherein the receiver comprises a receiving antenna (11), a high-frequency amplifier (12), a frequency mixer (13), a middle-frequency amplifier (14), a broadband frequency discriminator (15) and a video amplifier (16); the changeover switch (2) has two connecting modes, wherein one connecting mode is that the changeover switch (2) is connected to an A position to communicate the input end of the transmitter (3); and the other connecting mode is that the changeover switch (2) is connected to a B position to communicate an audio/video interface (22); the transmitter (3) comprises a video amplifier (31), a voltage controlled amplifier (32), a power amplifier (33) and a transmitting antenna (34); and a ground dispatching center can monitor the position and the environmental parameter (gas) change of mining and digging machinery in the mining area through a video on a real-time basis so as to keep continuous and smooth video communication line.
Description
Technical field
The present invention is a kind of underground passage wireless video communication base station that is suitable for, solve the exploiting field communication line and wear and tear, smash, pound the turn round disruption of the vision signal that causes communications of disconnected, recovery difficulty, roadway slope change point, tunnel, for guaranteeing that the ground maneuvers center can monitor that mechanical location is adopted, dug in the exploiting field and environmental parameter (gas) changes by real-time video monitoring, keep the video communication circuit unimpeded continuously, belong to the technical field that mine mine information monitoring device is made.
Background technology
The problem that prior art exists is: present domestic underground mining digging laneway communication mode adopts wire transmission more; Get in touch and exploiting field environment gas supplemental characteristic is gathered monitoring system etc. as the telephone communication at exploiting field and ground maneuvers center.Especially the exploiting field working face is that the working face position is along with the digging drilling depth constantly moves forward along with the exploitation digging footage is constantly pushed ahead.Therefore, the exploiting field communication line is just pushed ahead with working face and is constantly reclaimed the arrangement communication line, when serious the exploiting field communication line usually be subjected to operation process come off wearing and tearing such as coal cinder, smash, pound disconnected, reclaim the influence of putting in order, not only make phone, gas parameter transmission line is difficult in maintenance but also causes communication line smooth, even coal mine excavation and methane gas explosion accident take place down to the influence safety in production.
For preventing that mine accident from taking place, must solve the not smooth bottleneck problem of exploiting field communication line, adopt the downhole wireless video base station not only can solve the communication line problem of transmission such as phone, gas parameter, but also can solve the video communication transmission problem.Adopt wireless microwave to replace traditional wire transmission like this, simultaneously owing to gate road road surface knick point, and the tunnel reason of turning round cause the microwave signal intervisibility poor, incident microwave signal is discontinuous.For overcoming this situation, also should set up the base station.Communication line problem in exploiting field is must one of tackle the major problem around modernized mine always thus.This kind mine wireless video base station transmission system does not still have the precedent of application at present at home, outward.
Whether continuously the tunnel relay base station is to guarantee wireless video communication unimpeded key, the communication informations such as mechanical work scene, personnel's telephone number and digging environment (gas) parameter that keep adopting, dig working face exactly by remote data transmission to the unobstructed problem of control centre's multimedia monitoring screen message.The circuit of so long-range wire communication contact will keep having the real-time connection not to interrupt, at first to solve crossheading distance problem variable between exploiting field and the main haulage roadway, just crossheading is to adopt, dig scope of operation fltting speed and constantly reduce with the exploiting field apart from length, until near big lane so that crossheading apart from disappearance.Usually the crossheading distance changes the interior consideration communication line of crossheading distance zero to several kilometers numerical value change at such one, and this kind line characteristic must have and can not adopt wiredly, and must reach the purpose in effective transmission, path flexible for installation, easy to maintenance.Therefore, having only the transmission of the wireless video communication base station of employing is unique rational selection.
Wireless video communication base station can be realized voice, numeral, reach transmission of Information relays such as picture signal, be particularly suitable for the short-range applications in adverse circumstances tunnel, down-hole, must solve the crossheading video communication circuit question between exploiting field and the main haulage roadway, and main haulage roadway is equipped with the ore deposit information interface, the crossheading bearing of trend is by the directed driving of laser, therefore the direction orientation accuracy is very high, but there is the roadway slope change point in crossheading according to the coal seam variation, founder and a little just cause the crossheading intervisibility bad, therefore, video base station solves the roadway slope change point exactly and the uneven intervisibility problem of poor that causes in road surface occurs, and the assurance video communication is transmitted continuously.
Because gate road is the unique passage that connects between coal-winning machine stope and the down-hole transportation, the crossheading distance changes.After this exploiting field resource has been adopted, connect gate road and disappear thereupon yet, so this gate road does not allow to use the wire transmission circuit.We adopt wireless microwave video communication mode at gate road in order to deal with problems, because gate road is that main haulage roadway leads to getting working face the only way which must be passed, the road surface, tunnel founders a little and the turning situation, cause the microwave intervisibility bad, therefore at the gate road turning, uneven place causes signal attenuation that wireless turning video communication repeater must be set, and solves the video communication problem.
Summary of the invention
Technical problem: purpose of the present invention solves roadway wireless video communication repeating base station problem exactly, a kind of roadway wireless video communication base station is provided, guarantee that the ground maneuvers center can monitor that mechanical location is adopted, dug in the exploiting field and environmental parameter (gas) changes by real-time video monitoring, keeps the video communication circuit unimpeded continuously.
Technical scheme: for guaranteeing that the roadway wireless electric wave transmits in order, the base station should have carries out selection function to radio wave frequency exactly in the present invention, and Fig. 1 is a roadway wireless video base station system schematic diagram of the present invention.Shoot with video-corder four parts such as transmitter A, gate road base station B, gate road base station C and main haulage roadway interface wireless reception D by exploiting field mining machinery installation airborne wireless and form system; Wherein tunnel crossheading base station B and C are the main contents of invention.
The special video microwave signal while that receives from the wireless microwave emission in exploiting field of base station, the video microwave signal of again reception being come sends out after B inner repeat circuit in base station is handled again; Here merit attention, produce co-channel interference for preventing the base station, reception and tranmitting frequency section must be different carrier frequencies; Reception carrier frequency 2.4GHz among the figure, transmission carrier frequency 1.2GHz.In like manner, base station C receives the wireless carrier video information that sends from base station B.Here receive frequency 1.2GHz carrier signal receives the microwave video signal of coming and sends after C inner repeat circuit in base station is handled again, and transmission carrier frequency 2.4GHz etc. are come out the vision signal demodulation by wireless microwave receiving device at last.There are the factor of turning in intervisibility and the tunnel of considering the roadway wireless transmission channel, and have arranged two base station B and C in base station system simultaneously; Certainly, can increase and decrease base station number according to tunnel transmission needs, but quantity is unsuitable too many, so as not to bringing unnecessary maintenance.
The tunnel base station circuitry constitutes (see figure 2), and this base station comprises receiver, change over switch and transmitter three partial contents composition; Receiver comprises reception antenna, high-frequency amplifier, frequency mixer, intermediate frequency amplifier, broadband frequency discriminator, the video amplifier; The connected mode of change over switch has two, and the one, be connected to the A position, connect the transmitter input, the 2nd, be connected to the B position, the ringing tone video interface; Transmitter comprises the video amplifier, voltage-controlled amplifier, power amplifier, transmitting antenna;
Reception antenna is to wireless carrier 2.4GHz or 1.2GHz electromagnetic wave signal induction coupling, enter frequency mixer through high-frequency amplifier, frequency-selecting outputs to intermediate frequency amplifier after mixing, and intermediate frequency is amplified into the broadband frequency discriminator, therefrom frequency discrimination goes out vision signal, enters the video amplifier again;
The output of the video amplifier is modulated at information on 1.2GHz or the 2.4GHz carrier signal through voltage-controlled amplifier through change over switch again, and after the power amplifier enhancing signal, transmitting antenna is launched with the electromagnetic wave signal.
Frequency mixer comprises first crystal oscillator, first waveband selection, first programmable device, first phase-locked loop, first frequency-selective network; First programmable device is programmed into the output frequency of the first crystal oscillator 4MHz on carrier frequency 2.4GHz or the 1.2GHz, and first phase-locked loop is finished frequency-tracking, and finishes the purpose of selecting intermediate frequency carrier 480MHz by frequency-selective network, and high frequency carrier is become intermediate frequency carrier.
Voltage-controlled amplifier comprises second crystal oscillator, second waveband selection, second programmable device, second phase-locked loop, second frequency-selective network; Second programmable device is programmed into crystal oscillator 4MHz on carrier frequency 1.2GHz or the 2.4GHz, and second phase-locked loop is finished frequency-tracking, and second frequency-selective network output high frequency 1.2GHz or 2.4GHz carrier signal are launched signal through antenna by power amplifier.
Described first crystal oscillator, the second crystal oscillator crystal oscillator frequency and wireless microwave receiving and transmission carrier frequency should satisfy the frequency multiplication multiple relation of programmable device, and radio carrier frequency is adjustable in the 0.8---30GHz scope.Receiver And Transmitter transmits image frequency at 6-10MHz.
Tunnel base station circuitry principle is: received from the roadway wireless electromagnetic wave signal by antenna earlier, around antenna, form electromagnetic field, the receiver height is put input and is induced ultra-weak electronic signal, this signal is exported stronger high-frequency signal behind high-frequency amplifier, enter the base input end of mixer amplifier, high-frequency signal by crystal oscillator waveband selection, programmable device, phase-locked loop generation enters into the emitter-base bandgap grading input of mixer amplifier, frequency-selective network carries out mixing with two input high-frequency signals, therefrom selects intermediate-freuqncy signal and enters intermediate frequency amplifier.Strengthened through the intermediate frequency amplified signal, enter the broadband frequency discriminator again, what frequency discriminator came out is vision signal, output after video amplifies.Receiver circuit principle that Here it is.
Change over switch has two road outputs; Article one, connect A through change over switch and output to the input that the next stage video amplifies, another is connected B through change over switch and outputs to video interface.
The video amplifier input of transmitter inserts the vision signal of change over switch output, after signal strengthens, be input to the base stage of voltage-controlled amplifier, send into the emitter-base bandgap grading of voltage-controlled amplifier by crystal oscillator, waveband selection, programmable device, phase-locked loop output high-frequency carrier signal, by the vision signal of voltage-controlled amplifier carrier signal is modulated again, export the high frequency frequency modulated carrier by frequency-selective network, frequency modulated carrier is converted to electromagnetic wave with high-frequency carrier signal and goes out with sky alignment spatial emission after power amplifier strengthens.
Here be example explanation base station principle (see figure 3) to receive 2.4GHz signal forwarding 1.2GHz signal: the voltage-controlled amplifier of the frequency mixer of receiver, transmitter all adopts circuit such as crystal oscillator, waveband selection, programmable device, phase-locked loop, frequency-selective network to form in the base station.Here receiving with the crystal oscillator frequency of launching is identical (for 4MHz), owing to receive the 2.4GHz signal, programmable device internal processes parameter should be the integral multiple of carrier frequency frequency (2.4GHz) and crystal oscillator frequency (4MHz), and there are four Frequency points adjustable through waveband selection, each Frequency point has the 20MHz bandwidth, enter mixer amplifier through the stable frequency signal of phase-locked loop frequency-tracking output, the high frequency carrier input generates intermediate frequency carrier FM signal (480MHz) with phase-locked output signal after the frequency-selective network mixing, this frequency-modulated wave signal enters the broadband frequency discriminator.
The crystal oscillator frequency of transmitter and receiver is identical in the base station, because emission 1.2GHz signal, programmable device internal processes parameter should be the integral multiple of carrier frequency frequency (1.2GHz) and crystal oscillator frequency (4MHz), and there are four Frequency points adjustable through waveband selection, each Frequency point has the 20MHz bandwidth, enter voltage-controlled amplifier through the stable signal of phase-locked loop frequency-tracking output, after modulating, produce frequency-modulated wave and select carrier signal by frequency-selective network.Here it should be noted that the programmable device program parameter is relevant with the ratio of crystal oscillator frequency with the transmitting-receiving carrier frequency, and the ratio of carrier frequency and crystal oscillator frequency is integral multiple.As a same reason, for the base station principle (see figure 4) with reception 1.2GHz signal forwarding 2.4GHz signal: base station reception and transmitting carrier frequency frequency and crystal oscillator frequency relation must satisfy the integral multiple value.
Tunnel video base station system has been arranged, overcome the gate road turning, roadway slope change point influences the intervisibility factor.Apart from length, and the intervisibility condition is arranged the quantity that video communication base station is installed according to gate road.Had video base station to guarantee informational linkage between exploiting field and the ground maneuvers center, the control centre can finish following function:
1. exploiting field and ground maneuvers center realize that video telephone communication gets in touch, and avoid the gateway circuit wear and tear, smash, pound disconnected and trouble such as recovery arrangement.Maintain the continuous of communication line effectively.
2. environmental parameter video informations such as (gas) in exploiting field is transferred to the control centre in real time, continuously, and the realization video is monitored demonstration, processing, the storage of real-time gas data.
3. the outstanding variation of rubbing action process gas between machinery and the coal is adopted, dug to the video monitoring of adopting, digging the mechanical work process in exploiting field by video frequency tracking, realizes the outstanding parameter dynamic management of gas, comprises and adopt, dig process scene, roof pressure, digging drilling depth etc.; Realize the production statistical management report generation of per tour digging coal, finish the quantitative analysis of digging target, realize the modern management of moving target.
Beneficial effect: this roadway wireless video communication base station system uses in underground exploiting field and gate road first, adopt wireless video communication base station to efficiently solve the restricting relation that the gate road communication line is subjected to the dynamic operation of exploiting field mobile working face, thoroughly having solved the mobile working face causes communication line to wear and tear, smash, break, reclaim arrangement, problem such as difficult in maintenance, realize that the gate road communication line is unimpeded.Selecting for use the wireless video communication base station system not only to exempt circuit, to reclaim trouble but also the system maintenance of arrangement convenient and quick.In case communication link fails occurs, only need move the position of base station, change the direction of antenna for base station.
The gate road communication line is unimpeded just realizes that also the exploiting field is unimpeded with communicating by letter of ground maneuvers center, information such as exploiting field mechanical work, environmental parameter, field scene just can be transferred to the control centre, the operator on duty has grasped information such as down-hole mechanical and personnel's operational environment, can accomplish that just the science commander produces, and then accomplish global safety production.Video camera is installed on the coal-winning machine moving target and changes as the gas parameter, and video camera is moved with digger, and where where video camera then tracks digger, and where the gas parameter just monitors, and makes moving target escape not take off the sight line of video camera all the time.Thereby improved working face safety in production pipe level greatly.Make moving target always under the monitoring of people's sight line.In addition, this system can realize that also following technical functionality has: working face production safety management standardization is improved.
1; Real-time, the transmission continuously of mechanical work procedural information is adopted, is dug in the exploiting field, guarantees ground maneuvers center video monitoring.
2; Adopt, dig real-time, the transmission continuously of machine work environmental information parameter (gas) information, guarantee ground maneuvers center video monitoring.
3; Adopt, dig real-time, the transmission continuously of mechanical dynamic instantaneous position information, guarantee ground maneuvers center video monitoring.
Finish the safety in production tracking that above-mentioned functions is only the real meaning of digger working face, getting working face industry rules and regulations just really are achieved.Operate against regulations and just stopped.Mine disaster also just no longer takes place.
Description of drawings
Fig. 1 is a roadway wireless video base station system schematic diagram of the present invention.
Fig. 2 is a tunnel base station circuitry theory diagram.
Fig. 3 receives 2.4GHz to transmit 1.2GHz base station electricity theory diagram.
Fig. 4 receives 1.2GHz to transmit 2.4GHz base station electricity theory diagram.
Fig. 5 is the receiver electrical schematic diagram.
Fig. 6 is the transmitter electrical schematic diagram.
Reception antenna 11 among the figure, high-frequency amplifier 12, frequency mixer 13, crystal oscillator 131, waveband selection 132, programmable device 133, phase-locked loop 134, frequency-selective network 135; Intermediate frequency amplifier 14, broadband frequency discriminator 15, the video amplifier 16, video amplifies input 21, video interface 22, the video amplifier 31, voltage-controlled amplification 32, crystal oscillator 321, waveband selection 322, programmable device 323, phase-locked loop 134, frequency-selective network 135; Power amplifier 33, transmitting antenna 34.
Embodiment
Microwave receiver 1 is at first received from the faint carrier information of roadway wireless electromagnetic wave by antenna, and high-frequency amplifier amplifies faint information; Amplify the back carrier signal and send into frequency mixer, frequency mixer is made up of phase-locked loop (LMX233LA), Programmable Logic Controller (PLC16C54C), crystal oscillator (4MHz), waveband selection, frequency-selecting of intermediate frequency network.Here Programmable Logic Controller (PLC16C54C) is that logical operation is carried out in reference and waveband selection with crystal oscillator frequency (4MHz), operation result wants consistent with the reception carrier frequency, become the local oscillation centre frequency, phase-locked loop control adopts tracking and method for catching to guarantee that centre frequency has enough stabilized zones wide region with the left and right sides side frequency bandwidth of centre frequency; Frequency-selective network carries out mixing with the carrier signal that phase-locked loop is exported local oscillator center frequency signal and reception, and its result selects intermediate frequency (480MHz) carrier signal; Again mixer output signal carried out intermediate frequency amplification, filtering, amplify again, send into broadband frequency discriminator (SL1461) and carry out the carrier signal frequency discrimination, therefrom take out vision signal, this signal is carried out video again amplify back output U.Vision signal is sent into intermediate frequency discriminator (MC3361BP) after filter (L608) filtering in addition, and detection goes out the audio signal of TV, and it is respectively left passage L and right passage R that audio signal has two output channels.The dynamo-electric theory structure of whole reception is seen Fig. 5.
Three L, R, U signal that microwave emitter 3 is at first come by interface circuit, L, R are the television field frame audio signals, U is a television video frequency signal, L channel L sound accompaniment audio signal and R channel R sound accompaniment audio signal be modulated to respectively on the video frequencies signal obtain video modulation signal, deliver to an input of next stage voltage-controlled amplifier after right latter two video modulation signal superposes, and another input and phase-locked loop (LMX233LA) output is joined.The video modulation circuit is made up of voltage-controlled amplifier, phase-locked loop (LMX233LA), Programmable Logic Controller (PLC16C54C), crystal oscillator (4MHz), waveband selection, high frequency frequency-selective network.Here Programmable Logic Controller (PLC16C54C) carries out programming in logic with crystal oscillator frequency (4MHz), waveband selection, logic operation result wants consistent with transmission carrier frequency, become the local oscillation centre frequency, phase-locked loop control adopts tracking and method for catching to guarantee that centre frequency has enough stabilized zones wide region with the left and right sides side frequency bandwidth of centre frequency; Frequency-selective network is modulated to vision signal on the local oscillator centre frequency of phase-locked loop output, and the voltage-controlled amplifier output is exported high-frequency amplifier on the one hand, feeds back to the phase-locked loop input on the other hand.High-frequency carrier signal is after high-frequency amplifier amplifies, and signal is launched to lane space with electromagnetic wave by antenna.The dynamo-electric theory structure of whole emission is seen Fig. 6.
Roadway wireless video communication base station comprises receiver 1, change over switch 2 and transmitter 3 three partial contents composition; Receiver 1 comprises reception antenna 11, high-frequency amplifier 12, frequency mixer 13, intermediate frequency amplifier 14, broadband frequency discriminator 15, the video amplifier 16; Transmitter 3 comprises the video amplifier 31, voltage-controlled amplifier 32, power amplifier 33, transmitting antenna 34;
11 couples of wireless carrier 2.4GHz of reception antenna or 1.2GHz electromagnetic wave signal induction coupling, enter frequency mixer 13 through high-frequency amplifier 12, frequency-selecting outputs to intermediate frequency amplifier 14 after mixing, and intermediate frequency is amplified into broadband frequency discriminator 15, therefrom frequency discrimination goes out vision signal, enters the video amplifier 16 again;
The output of the video amplifier 16 links to each other with the video amplifier 31 inputs of transmitter through change over switch 2, information is modulated at again on 1.2GHz or the 2.4GHz carrier signal through voltage-controlled amplifier 32, after power amplifier 33 enhancing signal, transmitting antenna 34 is launched with the electromagnetic wave signal.
Frequency mixer 13 comprises first crystal oscillator 131, first waveband selection 132, first programmable device 133, first phase-locked loop, 134 first frequency-selective networks 135; First waveband selection 132 has fourth gear carrier frequency frequency around receiving carrier frequency 2.4GHz (1.2GHz), and bandwidth is the centre frequency f of 20MHz
01=2414 (1214) MHz, f02=2432 (1232) MHz, f03=2450 (1250) MHz, f04=2468 (1268) MHz are with the undistorted transmission of inhibit signal; And first programmable device 133 has the function that crystal oscillator 1314MHz is programmed into carrier frequency 2.4GHz (1.2GHz), actual lifting 600 (300) doubly, first phase-locked loop 134 is finished the purpose that frequency-tracking reaches stabilized frequency and bandwidth, frequency mixer 1 purpose is that high frequency carrier is become intermediate frequency carrier, and finishes the purpose of selecting intermediate frequency carrier 480MHz by frequency-selective network 135.
Voltage-controlled amplifier 32 comprises second crystal oscillator 321, second waveband selection 322, second programmable device 323, second phase-locked loop, 324 second frequency-selective networks 325; Second waveband selection 332 has fourth gear carrier frequency frequency around transmitting carrier frequency 1.2GHz (2.4GHz), and bandwidth is the centre frequency f of 20MHz
01=1214 (2414) MHz, f02=1232 (2432) MHz, f03=1250 (2450) MHz, f04=1268 (2468) MHz are with the undistorted transmission of inhibit signal; And second programmable device 333 has the function that crystal oscillator 2314MHz is programmed into carrier frequency 1.2GHz (2.4GHz), actual lifting 300 (600) doubly, second phase-locked loop 334 is finished the purpose that frequency-tracking reaches stabilized frequency and bandwidth, voltage-controlled amplifier 32 is modulated to the purpose that carrier frequency gets on to vision signal, and second frequency-selective network, 325 output high frequency 1.2GHz (2.4GHz) carrier signals launch signal through antenna for power amplifier.
Wireless microwave receiving and transmission carrier frequency and crystal oscillator frequency should satisfy the frequency multiplication multiple relation of programmable device, and radio carrier frequency is adjustable in (0.8---30) GHz scope.
Wireless microwave receiver and transmitter transmit image frequency at (6-10) MHz.
Internal conversion switch in wireless video base station can connect audio-video interface not only to be finished video communication but also audio signal sound accompaniment sound communication frequency (300-3400) Hz is arranged.
Claims (5)
1. a roadway wireless video communication base station is characterized in that this base station comprises receiver (1), change over switch (2) and transmitter (3) three partial contents composition; Receiver (1) comprises reception antenna (11), high-frequency amplifier (12), frequency mixer (13), intermediate frequency amplifier (14), broadband frequency discriminator (15), the video amplifier (16); The connected mode of change over switch (2) has two, and the one, be connected to the A position, connect transmitter (3) input, the 2nd, be connected to the B position, ringing tone video interface (22); Transmitter (3) comprises the video amplifier (31), voltage-controlled amplifier (32), power amplifier (33), transmitting antenna (34);
11 couples of wireless carrier 2.4GHz of reception antenna or 1.2GHz electromagnetic wave signal induction coupling, enter frequency mixer (13) through high-frequency amplifier (12), frequency-selecting outputs to intermediate frequency amplifier (14) after mixing, intermediate frequency is amplified into broadband frequency discriminator (15), therefrom frequency discrimination goes out vision signal, enters the video amplifier (16) again;
The output of the video amplifier (16) is modulated at information on 1.2GHz or the 2.4GHz carrier signal through voltage-controlled amplifier (32) through change over switch (2) again, and after power amplifier (33) enhancing signal, transmitting antenna (34) is launched with the electromagnetic wave signal.
2. roadway wireless video communication base station according to claim 1 is characterized in that frequency mixer (13) comprises first crystal oscillator (131), first waveband selection (132), first programmable device (133), first phase-locked loop (134) first frequency-selective networks (135); First programmable device (133) is programmed into the output frequency of first crystal oscillator (131) 4MHz on carrier frequency 2.4GHz or the 1.2GHz, first phase-locked loop (134) is finished frequency-tracking, and finish the purpose of selecting intermediate frequency carrier 480MHz by frequency-selective network (135), high frequency carrier is become intermediate frequency carrier.
3. roadway wireless video communication base station according to claim 1 is characterized in that voltage-controlled amplifier (32) comprises second crystal oscillator (321), second waveband selection (322), second programmable device (323), second phase-locked loop (324) second frequency-selective networks (325); Second programmable device (333) is programmed into crystal oscillator (231) 4MHz on carrier frequency 1.2GHz or the 2.4GHz, second phase-locked loop (324) is finished frequency-tracking, and second frequency-selective network (325) output high frequency 1.2GHz or 2.4GHz carrier signal are launched signal through antenna by power amplifier.
4. roadway wireless video communication base station according to claim 1, it is characterized in that described first crystal oscillator (131), second crystal oscillator (321) crystal oscillator frequency and wireless microwave receiving and transmission carrier frequency should satisfy the frequency multiplication multiple relation of programmable device, radio carrier frequency is adjustable in the 0.8---30GHz scope.
5. roadway wireless video communication base station according to claim 1 is characterized in that receiver (1) and transmitter (3) transmit image frequency at 6-10MHz.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014397A (en) * | 2010-09-08 | 2011-04-13 | 邵旭昂 | Radio frequency identification method and radio frequency identification system |
| CN102343915A (en) * | 2011-06-29 | 2012-02-08 | 中国恩菲工程技术有限公司 | Communication system used in coal mine for drawing mine car from front and back by using double locomotives |
| CN102457292A (en) * | 2010-10-19 | 2012-05-16 | 中国移动通信集团公司 | Terminal equipment |
| CN102928887A (en) * | 2012-10-22 | 2013-02-13 | 北京华安奥特科技有限公司 | Integrated signal receiving device of radio trench scenograph |
| CN103901843A (en) * | 2014-03-13 | 2014-07-02 | 三一重型装备有限公司 | Mining device and intelligent monitoring system thereof |
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| FI114827B (en) * | 2003-07-03 | 2004-12-31 | Sandvik Tamrock Oy | Method and system for monitoring the location of a mining vehicle |
| CN101122242B (en) * | 2007-03-21 | 2011-01-05 | 株洲大成测控技术有限公司 | Mine down-hole visual positioning and multifunctional safety monitoring network system |
| CN201267019Y (en) * | 2008-10-06 | 2009-07-01 | 四川天壹科技发展有限公司 | Mining base station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014397A (en) * | 2010-09-08 | 2011-04-13 | 邵旭昂 | Radio frequency identification method and radio frequency identification system |
| CN102014397B (en) * | 2010-09-08 | 2014-02-26 | 深圳市悦宏旭昂科技有限公司 | Radio frequency identification method and radio frequency identification system |
| CN102457292A (en) * | 2010-10-19 | 2012-05-16 | 中国移动通信集团公司 | Terminal equipment |
| CN102343915A (en) * | 2011-06-29 | 2012-02-08 | 中国恩菲工程技术有限公司 | Communication system used in coal mine for drawing mine car from front and back by using double locomotives |
| CN102928887A (en) * | 2012-10-22 | 2013-02-13 | 北京华安奥特科技有限公司 | Integrated signal receiving device of radio trench scenograph |
| CN103901843A (en) * | 2014-03-13 | 2014-07-02 | 三一重型装备有限公司 | Mining device and intelligent monitoring system thereof |
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| CN101765247B (en) | 2012-06-13 |
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