CN101299803A - Rediffusion mobile relay transmission system for news living broadcast vehicle - Google Patents
Rediffusion mobile relay transmission system for news living broadcast vehicle Download PDFInfo
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- CN101299803A CN101299803A CNA2008100314709A CN200810031470A CN101299803A CN 101299803 A CN101299803 A CN 101299803A CN A2008100314709 A CNA2008100314709 A CN A2008100314709A CN 200810031470 A CN200810031470 A CN 200810031470A CN 101299803 A CN101299803 A CN 101299803A
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Abstract
The invention discloses a television relay movement relay transmission system in the news OB van, including a relay transmission net consisting of a plurality of relay points only with receiving antenna units and transmitting antenna units, wherein each relay point is arranged to connect with a signal transmission port of the receiving antenna units and the transmitting antenna units with the moving relay van; a moving relay van loaded with a frequency conversion relayer device (including a receiving device, a frequency conversion device and a transmission device); a terminal receiving device of the relay point signal. Since each relay point in the system is equipped with the receiving antenna and the transmitting antenna, compared with the traditional relay networking mode, the cost of the networking device is reduced by at least more than 90%. The news ob van realizes the transmission ability of more than 90% in the city through the system. The invention has the advantages of low cost, high reliability, fast disposition, small frequency resource and easy maintenance and the like.
Description
Technical field
The invention belongs to ground (wireless) field of digital television transmission, be specifically related to a kind of television relay that is used for the live news car and move the relay transmission system.
Background technology
Along with the progress of development of times with science and technology, people are more and more high to the ageing requirement of TV news, occasion, unexpected incidents report.For realizing TV news report efficiently, provincial, and municipal level TV station begins to equip the live news car in recent years, makes every effort to rush towards in the very first time news spot, and the image and the audio signal of gathering in time is transmitted back to TV station, realizes on-the-spot live news.
Because the scene of news is a completely random, the uncertainty of region has proposed very high requirement to the Channel Transmission ability of live news car: i.e. arbitrary news point in the scope of linchpin urban area, should as much as possible signal in time be transmitted back to TV station, and all gather, the deployment of transmission equipment will finish in the extremely short time.In recent years, the terrestrial DTV transmission technology develops very soon, and technical systems such as DVB-T, DMB-T, ADTB-T release one after another.At present, the application of DVB-T (European standard) transmission system is universal relatively, the wireless transmission channel that its utilization COFDM modulation technique is set up, has stronger anti-multipath albedo, can be implemented under certain obstruct condition (non line of sight) and the effective transmission in moving, broken through the multiple technologies bottleneck under original microwave transmission system, thereby be widely used in the transmission system of live news car, and the agility that makes the news car dispose is significantly improved.Yet, owing to be subjected to the height of the vehicle-mounted transmitting antenna of live news car, the restriction of transmitter power grade, TV station reception antenna position, height may not be desirable and the application conditions that is difficult to change, the live news car is under the relative adverse circumstances that the urban skyscraper group is gathered, its transmittability still shows very limitedly, and effectively transmittability accounts for 1/10～3/10 of urban area.The application that the problem of transmission has influenced the news car has to a great extent also restricted the development of field, news car market.Improve the transmittability of news car,, under present technical background, almost do not have good solution from the technological improvement channel of vehicle-mounted emission system itself.Therefore, people want to realize the relay of signal is transmitted by the mode of setting up relay station.Yet, because live news is very harsh to the time requirement of system deployment, the news scene reaches and builds the required landform of relay station temporarily all under uncertain or condition of unknown, ensure the reliable foundation of signal transmission passage, its success rate is very low, and the time that effective system is disposed also uncontrollable district control is when probably by the time system building is complete, news finishes, constitutes the failure of live news.
By realize the live news car can the effective transmission at least 80% ground domain space of linchpin urban area, set up the transmission network of news car if take the Cellular Networks structure of similar telecommunications mobile communication, promptly according to the vehicle-mounted transmission equipment of news car in the urban area, behind test transmission on the spot and the blind area of determining (or blind spot), come planning and designing to set up the corresponding relay website, thereby construct the relay transmission network of live broadcast vehicle.When live broadcast vehicle and TV station can not set up transmission channel, realize effective relay transmission by the relay station of having set up, this scheme is feasible in theory, but it will face many problems if drop into practical application:
1, the trunk network that is made of a plurality of traditional relay station at first will determine to set up single frequency network or multiple frequency network, MFN.Traditional same frequency relaying (single-frequency) exists the isolating problem of dual-mode antenna, particularly will produce extremely serious co-channel interference when a plurality of relay stations are worked simultaneously in the single frequency network, thereby single frequency network can not be used.Set up multiple frequency network, MFN and implement in frequency conversion relaying (or regenerative repeating) mode, then each relay station needs a specific emission frequency, and the shared frequency spectrum of a plurality of relay stations will cause the huge waste of frequency resource.
2, the equipment of a frequency conversion relay station constitutes:
(1) radiating portion: receive and emission air feedback unit, receiving equipment unit, frequency conversion and transmitter unit.
(2) terminal receiving unit: receive air feedback unit, receiving equipment unit.
Therefore, set up a trunk network and need be equipped with N relay station, then need N cover emission and N cover receiving unit equipment, and the cost of each relay station is about 100,000 yuan (RMB), it is quite huge to set up a such fund that transmission network spent.
3, need uninterruptedly power up work in 24 hours for ensureing that each relay station is enabled then at any time, and only need 1 of N relay station during each relay transmission, this has not only caused the waste on the equipment and the energy, long-time continual working method has caused the increasing of equipment loss, the reduction of reliability and the increase of maintenance cost.
In sum, for radio and television departments, only for the transmittability that improves the live news car make up such one expend frequency resource, investment is huge, equipment is various, utilization rate is low, maintenance cost is high transmission network almost is impossible, in fact there is not which TV station to implement so yet, and the live news car can only maintain and extending so far in this part existing shortcomings and deficiencies of transmission always.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, be intended to by coming by a plurality of traditional relay stations under the situation that networking can not implement again, and a kind of cost that provides is low, reliability is high, deployment time is fast, the acquisition frequency resource is few, the relay transmission system is moved in the television relay that is used for the live news car that is easy to safeguard.
The television relay that the present invention is used for the live news car is moved the relay transmission system and is comprised:
One only comprises the relay transmission network that the relay point of reception, transmission antenna unit constitutes, the reception that each relay point setting can be connected with mobile repeater car, the signal transmission port of transmission antenna unit by several;
One is loaded with the frequency conversion trunking mobile repeater car of (comprising reception, frequency conversion and emitter);
The terminal receiving equipment of one relay point signal.
Described reception, transmission antenna unit are first reception antenna and cable, first transmitting antenna and cable.
Described frequency conversion trunking comprises second reception antenna, second transmitting antenna, first receiver, frequency conversion and emission power amplifier and sending and receiving surveillance equipment and UPS uninterrupted power supply.
Described terminal receiving equipment is the 3rd reception antenna of TV station and cable, second receiver.
Reception in the native system, transmission antenna unit, vehicle-carried mobile frequency conversion trunking and terminal receiving equipment all can adopt prior art.
The structure of system
The blind area (or blind spot) that exists when the local actual transmissions according to its vehicle-mounted transmission equipment of live news car, distribution situation in conjunction with local landform and skyscraper, take all factors into consideration the application demand of TV station, determine to make up N the relay point of the required foundation of relay transmission network and the addressing of specifically building a station of each relay point, thereby constitute the transmission region scope of each relay point, after news scene position is determined, can judge rapidly and enable certain relay station.
Described each relay point is only installed reception, transmission antenna unit, and be not equipped with other trunkings, the installation of the first sending and receiving antenna wherein generally is selected in this regional skyscraper roof, and the first sending and receiving antenna of certain altitude of having has like this possessed the most valuable link condition of Channel Transmission.The stube cable of the first sending and receiving antenna is placed in ground floor by the floor pipeline and is convenient to the zone that mobile repeater car is stopped outward, and the port of two cables can be installed in connecting in the case of a special use in case of necessity, to obtain corresponding security protection.
Because the frequency conversion trunking is designed to vehicle-mounted type, its integrated level height, volume are little, and the boot of a common dolly can easily hold.Vehicle-mounted frequency conversion trunking also has been equipped with the news car signal that is received and the image of repeater car emission and the function for monitoring of sound accompaniment, and the equipment work power supply is supplied with by vehicle-mounted ups power.
Mobile repeater car can utilize second self-contained sending and receiving antenna and vehicle-mounted frequency conversion trunking to constitute the mobile relay system of independent completion.If near the news spot when having suitable landform, it can directly be finished and the linking and emission of news car signal, and needn't enable the former relay point that presets.Similarly, when the news car exceed fixed relay transmission regional extent (as in the strange land), or the relay point of originally enabling then selects corresponding landform to set up interim repeated link by mobile repeater car when breaking down, and finishes the transmission of signal.The independent relay capabilities that mobile repeater car had has improved the reliability of whole system to a certain extent, makes that also the range of application of live news car is expanded.
The advantage of native system
Traditional relay station networking model is to construct trunk network by setting up one and another complete relay station, moreover for guaranteeing network at any time by the possibility of usefulness, all relay stations all are all weather operations, and the cellular base station of telecommunications comes to this.Because the particularity that the application of live news car exists: only enable the some relay stations in the trunk network at every turn when promptly using, thereby just make native system possess the most basic application prerequisite.
1, in complete relay station equipment of native system constituted, the cost ratio of the shared system of sending and receiving antenna (decimeter range) was generally about 1/10.Because each relay point of native system is only installed the sending and receiving antenna, compares with traditional relay networking mode, reduces more than 90% at least on the cost structure of networking equipment.This extremely cheap networking investing method makes the live news car realize that the transmittability arrival of urban area, place becomes possibility more than 90%.
2, adopt vehicle-mounted mobile trunking scheme, can realize quickly being communicated with and constitute complete relay station with the target relay point, arrive or satisfy the requirement of live news, and only need be equipped with the complete relay station of a cover in the whole junction network system equipment deployment time and correlation technique index.
3, whole junction network has only an emission frequency, and frequency spectrum resource takies very few.And traditional by the required a plurality of tranmitting frequencies of a plurality of relay station networkings, in fact be can not be obtainable, this is not the problem that can solve by infusion of financial resources.On obtainable frequency resource, the native system scheme has best uniqueness.
4, compare with traditional relay station, the relay point in the native system has only been installed passive antenna element (need not to power up), and the dissipation problem that does not the have the energy simultaneously reliability of its system is also much higher, and the maintenance of equipment is much smaller.
5, mobile repeater car self possesses complete relay capabilities, and mobility is very strong, can constitute very multiple flexibly applied in any combination mode with the live news car.This feature will show more remarkably in the application of other field (as army, police and all kinds of emergency communication department).
6, native system is in case foundation except that radio and television departments use, for other departments of unexpected incidents live video demand, also can obtain realize sharing of resource by this network.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Accompanying drawing is the schematic diagram that the relay transmission system is moved in television relay of the present invention.
Embodiment
To move the relay transmission system be example to make up certain city TV station television relay of south.
This TV station is located in the downtown area because the big story height at place has only 12 layers, peripheral high building around, the vehicle-mounted high field that transmits that reception antenna can be received relatively a little less than.Domestic priority has three, four well-known radio transmission apparatus manufacturers of family to do vehicle-mounted transmission experiment in its region, effectively transmits radius generally about 3KM.This is with respect to the city, and the transmittability of channel shows very limitedly, thereby the live news car procurement scheme of purchasing in the original plan fails to implement so far.
The onboard wireless transmission manner has two kinds of selections: the one, adopt satellite transmits, and the 2nd, adopt terrestrial transmission.Owing to during high and each application transport of satellite-transmission gear price, must and cause the great number expenditure of operation cost and use the inconvenience of period to Satellite Communications Company's reservation lease satellite channel, so abandon the satellite transmits mode.The ability of terrestrial transmission determines and embodies the using value of live news car to a great extent, by setting up the mobile relay transmission network of native system, can make the transmittability of news car greatly improve, and can reach or satisfy user's transmission demand.
Native system comprises:
One by being located at transmission range on the thing of urban skyscraper greater than 20 relay transmission networks that relay point constitutes of 10KM, each relay point is only installed cover reception antenna 5 and cable 3, transmitting antenna 6 and a cable 4 is set, the signal transmission port 2 of reception antenna cable and transmitting antenna cable is set at the bottom of building, this port 2 can be connected with mobile repeater car 1, gross investment is 100,000 yuan, constitutes the basic transmission network in urban district;
A mobile repeater car 1 that is loaded with the frequency conversion trunking, described frequency conversion trunking comprise reception antenna, transmitting antenna, receiver, frequency conversion and emission power amplifier and sending and receiving surveillance equipment and UPS uninterrupted power supply;
The reception antenna 7 of one cover TV station and cable 8, receiver 9.
The reception antenna 5 of relay point (receiving news car signal) adopts gain to be the omnidirectional antenna of 8dbi, and transmitting antenna 6 can be selected the multiple unit directional antenna of omnidirectional or high-gain (14dbi) for use.Suitably separately to realize isolation, the antenna mounting bracket should be solid and reliable in sending and receiving antenna 5,6 installation sites.Sending and receiving antenna cable 3,4 adopts low-loss SYV-9 cable, is extended down to bottom under the cable tubing by building, in the place of being convenient to repeater car 1 stop and be connected the special-purpose terminal box of joining that is provided with signal transmission port 2 is installed, and pays attention to corresponding security protection.
The YW-10Z relay station that the trunking of mobile repeater car equipment can adopt the space flight Asia to defend, frequency conversion or regenerative relay system can be selected in this station, and transmit frequency band is 600～800MHZ, and tranmitting frequency is adjustable; Transmitter power is 20W, variable.YW-10Z is furnished with to receiving and looking of transmitting, audio surveillance function, to realize the in good time observation to news car and TV station's signal transmission link.What YW-10Z was equipped with is the whip antenna that has the magnet sucker with car sending and receiving antenna, can place roof easily.The ups power that repeater car is equipped with can provide the support of the electric power more than 3 hours by user's request.
The terminal reception antenna that the YW-10Z relay station is equipped with is the omnidirectional antenna of gain 12dbi, and receiver is a YWR-900 DVB-T receiver.If the long low noise amplifier that then can install additional of stube cable between antenna and receiver is with the compensated line loss.
Because the volume of YW-10Z relay station and power supply is less, the trunk of common dolly (Sang Tanna) can easily hold, thereby the car body type selecting of repeater car can be according to user's self situation decision.
That mobile repeater car self has constituted is complete, relay station movably, and according to concrete operating position, itself and live news car can constitute multiple application model.
The operation principle of system:
See accompanying drawing, after TV station obtains news clue and scene, can determine to enable N the relay point of relay transmission network that is arranged in this zone, mobile repeater car 1 and live news car 10 rush towards in can be at one time corresponding appointed place (because of two job sites not far from one another).Repeater car 1 arrives relay point sending and receiving antenna cable signal transmission port 2 places of enabling, and two joints of sending and receiving antenna stube cable are communicated with vehicle-mounted trunking interface, and the deployment of relay station is promptly accused and finished.After the system power-up, trunking enters operating state, and the information source that live news car 10 is gathered can be transmitted back to TV station by the relay of repeater car 1 in good time effectively.
The vehicle-mounted surveillance equipment that mobile repeater car is equipped with can monitor the transmission of news car signal and the reception condition of repeater car respectively, and the forwarding situation of trunking.The outfit of repeater car ups power answers safeguards system can work more than 3 hours, and repeater car is very convenient can be equipped with special train or dual-purpose vehicle as the case may be because of trunking is loaded into.
Certainly, if the news spot is in the location that the live news car utilizes himself vehicle-mounted transmission equipment information source can be passed back, that just can determine whether to employ repeater car, can be used as the backup information source of transmission as if enabling signal that repeater car then passes back.
Claims (4)
1, the relay transmission system is moved in a kind of television relay that is used for the live news car, it is characterized in that comprising:
One only comprises the relay transmission network that the relay point of reception, transmission antenna unit constitutes, the reception that each relay point setting can be connected with mobile repeater car, the signal transmission port of transmission antenna unit by several;
One is loaded with the mobile repeater car of frequency conversion trunking;
The terminal receiving equipment of one relay point signal.
2, the relay transmission system is moved in the television relay that is used for the live news car according to claim 1, it is characterized in that described reception, transmission antenna unit are first reception antenna and cable, first transmitting antenna and cable.
3, the relay transmission system is moved in the television relay that is used for the live news car according to claim 1, it is characterized in that described frequency conversion trunking comprises second reception antenna, second transmitting antenna, first receiver, frequency conversion and emission power amplifier and sending and receiving surveillance equipment and UPS uninterrupted power supply.
4, the relay transmission system is moved in the television relay that is used for the live news car according to claim 1, it is characterized in that described terminal receiving equipment is the 3rd reception antenna of TV station and cable, second receiver.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100314709A CN101299803A (en) | 2008-06-12 | 2008-06-12 | Rediffusion mobile relay transmission system for news living broadcast vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100314709A CN101299803A (en) | 2008-06-12 | 2008-06-12 | Rediffusion mobile relay transmission system for news living broadcast vehicle |
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| CN101299803A true CN101299803A (en) | 2008-11-05 |
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| CNA2008100314709A Pending CN101299803A (en) | 2008-06-12 | 2008-06-12 | Rediffusion mobile relay transmission system for news living broadcast vehicle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702775B (en) * | 2009-08-28 | 2011-07-06 | 厦门科安技术开发有限公司 | Digital microwave image transmission system and transmission method |
| CN103647594A (en) * | 2013-12-06 | 2014-03-19 | 镇江市星禾物联科技有限公司 | Wireless communication system applied to building blind area environment |
| CN103841570A (en) * | 2013-12-06 | 2014-06-04 | 镇江坤泉电子科技有限公司 | Wireless mobile communication system effectively applied to office environment |
| CN106856407A (en) * | 2017-01-10 | 2017-06-16 | 四川九洲电器集团有限责任公司 | A kind of car-mounted device and method for amplifying RF signal |
| CN110326322A (en) * | 2017-03-13 | 2019-10-11 | 华为技术有限公司 | Device and method for the deployment of nomadic relay node |
-
2008
- 2008-06-12 CN CNA2008100314709A patent/CN101299803A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702775B (en) * | 2009-08-28 | 2011-07-06 | 厦门科安技术开发有限公司 | Digital microwave image transmission system and transmission method |
| CN103647594A (en) * | 2013-12-06 | 2014-03-19 | 镇江市星禾物联科技有限公司 | Wireless communication system applied to building blind area environment |
| CN103841570A (en) * | 2013-12-06 | 2014-06-04 | 镇江坤泉电子科技有限公司 | Wireless mobile communication system effectively applied to office environment |
| CN106856407A (en) * | 2017-01-10 | 2017-06-16 | 四川九洲电器集团有限责任公司 | A kind of car-mounted device and method for amplifying RF signal |
| CN110326322A (en) * | 2017-03-13 | 2019-10-11 | 华为技术有限公司 | Device and method for the deployment of nomadic relay node |
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