CN101815306A - Method for realizing industrial controlled information transmission in user resident region and method thereof - Google Patents
Method for realizing industrial controlled information transmission in user resident region and method thereof Download PDFInfo
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- CN101815306A CN101815306A CN200910078428A CN200910078428A CN101815306A CN 101815306 A CN101815306 A CN 101815306A CN 200910078428 A CN200910078428 A CN 200910078428A CN 200910078428 A CN200910078428 A CN 200910078428A CN 101815306 A CN101815306 A CN 101815306A
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Abstract
The invention discloses a system and a method for realizing industrial controlled information transmission in a user resident region, which is realized by adopting a network consisting of information source junction, optical fiber transmission and remote coverage. The information source junction part completes unified access of multiple service signals; the optical fiber transmission part completes relay transmission of signals; the remote coverage part completes distribution of multiple service wireless radio frequency signals; a distribution network of wireless signals (industrial controlled signal should be converted to a radio frequency signal through modulation and upper conversion) is formed by the three parts which are mutually independent and organically combined as well so as to achieve the aim of signal coverage in the target region (indoor and decentralized regions). The system and the method can realize networking of the industrial controlled information system, realize centralized transmission and management of the industrial controlled information, change the mode of wireless signal coverage by single power equipment, simultaneously change the mode of decentralized processing, and provide powerful support and guarantee for industrial control construction.
Description
Technical field
The present invention relates to the mobile communication wireless technical field of access networks, particularly realize the system and method for user net area industry control message transmission.
Background technology
A large industrial enterprise has a large amount of industry control informational needs transmission, comprises all departments' daily output form, production scheduling, material inventory, vehicle scheduling, production safety monitoring or the like mass data information.For example, the production division of a medium above iron and steel enterprise is made up of the department and the corresponding maintenance agency thereof of many equal tool scales such as iron-smelter, steel mill, coke-oven plant, washup factory, steel rolling mill, iron ore field, lime stone mining site, slag treatment plant, Department of Transportation, power plant, therebetween Chuan Shu big the well imagining of industry control amount of information.In the age that communication falls behind, conditions at the lower levels are uploaded, are gone up order and assign complete in telephone.Afterwards, the enterprise that had adopts the simulation trunked communication system to enhance productivity.In recent years, along with the development of digital cluster communication technology, some advanced large enterprises begin the update of communications facility again, adopt digital clustering communication system, and further convenient production command scheduling increases substantially production efficiency.
But up to now, in industry control transmission of Information network,, also adopt traditional approach to cover, i.e. base station+active dried mode of putting particularly in user's net area part.This mode is to form by information source (macrocellular, microcellulor, BBU+RRU, repeater etc.)+active device (or passive device)+devices such as feeder line+antenna, this mode brings various problems for construction, transformation, optimization and the upgrading etc. of existing network, such as:
Planning problem: unspecial indoor covering customization frequency range when planning at the industry control signal, need to carry out accurate link budget and capacity configuration before the planning, at the different threshold value of different path settings, therefore the interference level that can cause leaking is wayward, the frequency planning difficulty, be difficult to evade interference, also need repeat complicated link budget when the network capacity extension and transformation, and increase because the blind area cover antenna that dilatation brings; And network just is difficult for change once planning, can not merge and split the sub-district flexibly.
Covering problem: when covering in the big zone of carrying out the industry control signal, need a plurality of high-power power amplifiers to drive, satisfying the overlay area demand, its negative effect is to cause the lifting of making an uproar at the bottom of the base station, has a strong impact on communication quality.
Capacity problem: owing to adopt in the mode covering chamber of a plurality of power amplifiers application, make the base station integrated noise increase, reduced receiving sensitivity, reduced the area that the base station covers, increased uplink load, reduced the absorption to user's telephone traffic to a certain extent, promptly capacity reduces.
Summary of the invention
In view of this, the object of the present invention is to provide the system and method for realizing user net area industry control message transmission, be used for solving the problem of constructing and implementing of industry control information service transmission network planning construction station access network.
For achieving the above object, the invention provides a kind of system that realizes user net area industry control message transmission, comprising:
The service set unit through modulation, up-conversion, closes the industry control information data road with the radiofrequency signal of other various information sources after changing to rf signal, and converts light signal to, exports after being divided into maximum 8 road light signals by optical branching device again; Convert the multipath light signal that receives to the signal of telecommunication by light/electric conversion respectively, behind synthetic one road signal of telecommunication of mixer, isolate the rf signal of industry control information data and after down-conversion, demodulation, export;
User business interface unit, the light signal that is used for receiving is reduced to rf signal by light/electric conversion, export by duplexer after amplifying through filtering, compensation, be sent to the user that aerial radiation is given the respective coverage areas territory through feeder line, wherein industry control information is reduced into industry control information and is sent to corresponding user through down-conversion, demodulation; The industry control information data through modulation, up-conversion, is closed the road with the multi-service uplink radiofrequency signal after changing to rf signal, and be converted to light signal output.
The present invention also provides a kind of method that realizes user net area industry control message transmission, comprising: on down direction,
The industry control information data through modulation, up-conversion, is closed the road with the radiofrequency signal of other various information sources after changing to rf signal, and converted light signal to, export after being divided into maximum 8 road light signals by optical branching device again; The light signal that receives is reduced to rf signal by light/electric conversion, export by duplexer after amplifying through filtering, compensation, be sent to the user that aerial radiation is given the respective coverage areas territory through feeder line, wherein industry control information is reduced into industry control information and is sent to corresponding user through down-conversion, demodulation;
On up direction,
The industry control information data through modulation, up-conversion, is closed the road with the multi-service uplink radiofrequency signal after changing to rf signal, and be converted to light signal output; Convert the multipath light signal that receives to the signal of telecommunication by light/electric conversion respectively, behind synthetic one road signal of telecommunication of mixer, isolate the rf signal of industry control information data and after down-conversion, demodulation, export.
The present invention adopts the Full Fibre Network system, the user net area indoor distributed system of industry control message transmission is divided into information source access, Optical Fiber Transmission, far-end covers three parts.Adopt ultra broadband that fiber medium had, super low consumption, the transmission finished from the information source convergence point to each signal access point of dielectric property cheaply to distribute.When solving the distribution of wireless signal, the frequency resource that the repetition resource characteristics that has utilized wireless signal to be had in the short space scope is brought is reused advantage, and the low-cost characteristic of signal processing, the overlay area is divided into a plurality of film micro areas, solve the distribution problem of signal.Utilize the transmission carrier wave of light wave as the super wideband wireless radiofrequency signal, with the traffic carrier signal in all radio band scopes, after electricity/optical transducer converts light signal to by Optical Fiber Transmission, thereby realize ultra broadband, super low consumption, low cost, multinode, on a large scale, high quality transmission distribution requirement.
The present invention can be at indoor customization frequency, and the user business interface unit power output can be easy to controlled microwave and leak by software control, reduces and disturbs; Because the user business interface unit power output is constant, need not to carry out complicated power budget when the network capacity extension and transformation.Preposition LNA technology by user business interface unit is improved upstream noise, the quality of reception of elevator system.Can improve upstream noise, reduce the influence that traffic is absorbed; A plurality of frequencies can be combined in the sub-district and use, use in a plurality of sub-districts respectively than same a plurality of frequencies and can improve capacity.
Description of drawings
Fig. 1 realizes the system construction drawing that indoor covering and discrete areas cover in industry control information service transmission network in the embodiments of the invention;
Fig. 2 is the process flow figure of downstream signal in the station access network of carrying industry control information in the embodiments of the invention;
Fig. 3 is a systemic-function schematic diagram of realizing user net area industry control message transmission in the embodiments of the invention;
Fig. 4 is a network management monitoring function diagram of realizing the user net area industry control information transmission system in the embodiments of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage thereof more cheer and bright, the present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is that the embodiment of the invention realizes the system construction drawing that indoor covering and discrete areas the cover, " S among the figure in industry control information service transmission network
I1" be the downstream signal of information source 1, promptly be input to the downlink radio frequency service signal of first information source of service set unit; " S
O1" be the upward signal of information source 1; be the up radio service signal that outputs to first information source from professional centralized unit; the rest may be inferred for all the other (wherein; at the information source side of service set unit and the user side of user business interface unit, non-radio service signal such as industry control information data needs to become radiofrequency signal through modulation, up-conversion; Otherwise, splitter output in the service set unit and the descending output of user business interface unit, professional radiofrequency signal such as industry control information needs to revert to corresponding service signals such as industry control information through down-conversion, demodulation), " L
1, L
2... L
n" expression transmission unit different levels.This system specifically describes as follows:
Whole system is tree topology, and the service set unit provides a plurality of minutes support interfaces downwards, can hang maximum 8 transmission units or user business interface unit down.For realizing more user business interface units that insert more neatly, system supports multistage expansion.The one-level transmission unit provides maximum 8 branch support interfaces downwards, can hang maximum 8 secondary transport unit or user business interface unit down.The secondary transport unit provides maximum 8 branch support interfaces downwards again, can hang maximum 8 three grades of transmission units or user business interface unit down.The rest may be inferred, can form more multistage expansion transmission thus.Simultaneously, the service set unit can be not connect user business interface unit by transmission unit under directly, or by connecing user business interface unit under the multistage transmission unit, system can realize the flexible Application that scope is changeable like this.Wherein, structure, the function of the transmission unit of heterogeneous networks node location are identical, and be different and why distinguish the level transmission unit by the node location in its network topology of living in.
In the construction of above industry control information service transmission network, should be according to target area wireless environment and footprint size, determine user capacity and networking structure, and then the quantity of the service set unit on definite Network node, the transmission unit on the transmission node, all kinds of unit such as user business interface unit on the user node, and the distance of definite Optical Fiber Transmission, build into a station access network network.System determines the carrier number that the information source base station provides according to user capacity, for superhuge overlay area, if information source can not provide enough number of carriers, then need subregion is carried out in the overlay area, in multiplexing mode, increase network capacity, satisfy user's demand.In industry control information service transmission network construction plan, should carry out in indoor, the outdoor separately mode of planning, can realize like this reducing and disturb, realize channeling, increase the utilance of frequency resource.
The major function of each equipment is described below by descending flow process:
The major function of service set unit is to finish the access of source signal, and the radiofrequency signal of various information sources (non-radiofrequency signal such as industry control information data needs earlier through modulation, up-conversion, change to radiofrequency signal) convert light signal to by electricity/light conversion, after being divided into maximum 8 road light signals by optical branching device again, through Optical Fiber Transmission to maximum 8 next stage transmission units or user business interface unit; The multipath light signal of being about on it receive converts the signal of telecommunication to by light/electric conversion respectively, by synthetic one road signal of telecommunication of mixer, and then being divided into the radiofrequency signal of different frequency range by the microwave passive splitter, the rf signal of wherein industry control information data is exported after down-conversion, demodulation.Can interfere with each other owing to directly close the road, signal transmission quality is worsened,, close the problem that interferes with each other that light signal can be avoided in the road then so on up direction, must earlier light signal be become the signal of telecommunication with the frequency light signal.Here uply close the signal of telecommunication that the road refers to all information of terminal user and close the road, because the splitter of service set unit input is a microwave passive splitter of handling radiofrequency signal, by it whole rf signals are implemented along separate routes, the radiofrequency signal that is divided into different frequency range comprises the radiofrequency signal that contains industry control information.The modulation of industry control signal, demodulation and upper and lower frequency conversion are finished by independent device.
The major function of transmission unit is: the light signal of its descending reception upper level equipment, convert the signal of telecommunication to by light/electricity, after compensation is amplified, again through electricity/light conversion, again become light signal, be divided into 8 road light signals by optical branching device, deliver to maximum 8 next stage transmission units or user business interface unit; Being about to maximum 8 road light signals on it becomes the signal of telecommunication by the photoelectric transformer of correspondence respectively, and synthetic then one road signal of telecommunication becomes the output of one road light signal through electrical optical converter more again after compensation is amplified, deliver to upper level transmission unit or service set unit.
The major function of user business interface unit is: its descending light signal that is used for receiving is reduced to rf signal by light/electric conversion, export by duplexer after amplifying through filtering, compensation, be sent to the user that aerial radiation is given the respective coverage areas territory through feeder line, wherein industry control information is reduced into industry control information and is sent to corresponding user through down-conversion, demodulation; The industry control information data be about on it through modulation, up-conversion, close the road with the multi-service uplink radiofrequency signal after changing to rf signal, and be converted to light signal output.
The signal processing of system shown in Figure 1 is as follows:
With industry control information through modulation, after the up-conversion, be transformed into radiofrequency signal, be input to the service set unit with other multi-service downlink radio-frequency signal in the information source side, service signal mixer by its input is merged into one road signal of telecommunication, again through electricity/light conversion becoming light signal, be divided into 8 road light signals by optical branching device then, be sent to maximum 8 transmission units through optical fiber; Transmission unit converts light signal to the signal of telecommunication, converts light signal again to after compensation is amplified, and is divided into 8 road light signals by optical branching device, sends into maximum 8 next stage transmission units or user business interface unit by optical fiber; User business interface unit becomes the signal of telecommunication to light signal again, amplifies back output by filtering, compensation, delivers to the user that aerial radiation is given the respective coverage areas territory through feeder line.
, amplify, after the filtering, convert light signal to, send into transmission unit through optical fiber again to the antenna that joins with user business interface unit from the multi-service uplink signal radiation of various terminals through low noise by electricity/light conversion; Transmission unit converts multipath light signal to the signal of telecommunication by light/electric conversion respectively, after amplifying, compensation becomes one road signal of telecommunication by mixer, again convert light signal to by electricity/optical transducer again, send into upper level transmission unit or service set unit through optical fiber; The service set unit converts multipath light signal to the signal of telecommunication by light/electric transducer respectively, becomes one road signal of telecommunication by mixer, is divided into various radio service signals by professional splitter then and delivers to corresponding information source network.
For further specifying above-mentioned flow process, be example with the processing method of downstream signal in the multiple services station access networks such as carrying industry control information, the flow process of this method specifically may further comprise the steps as shown in Figure 2:
The light signal of step 203, multichannel output is delivered to the one-level transmission unit via optical fiber respectively.
Process light/electric the conversion in the one-level transmission unit respectively of step 204, each road light signal becomes the signal of telecommunication after carry out electricity/light conversion again after the compensation processing and amplifying, becomes light signal again after optical branching device output.
The light signal of step 205, each road output is delivered to the secondary transport unit via optical fiber respectively.
As previously mentioned, the equipment disposition amount is here decided by user's request, determines whether needs one-level transmission unit and secondary transport unit according to number of users, or more transmission unit.
Upward signal flow process and downstream signal flow process are similar, and be basic identical in other words.Its main difference need in service set unit and the transmission unit to be a plurality of light/electric transducers, and the multichannel uplink optical signal of each unit input is carried out light/electric conversion respectively earlier, is merged into one road rf signal through mixer after becoming the signal of telecommunication.In the service set unit, this road synthetic signal of telecommunication is delivered to corresponding information source network by the radiofrequency signal that the service signal mixer is separated into different frequency range after compensation deals; In transmission unit, this road synthetic signal of telecommunication becomes the output of one road light signal through electricity/light conversion again after compensation deals up.
By above method, for the net area user high-quality that can merge diverse network, low cost, low electromagnetic pollution are provided, to the unified access way of environmental disruption minimum, finish this net area comprised that the access of information services of all kinds of industry control information picks out and carry transmitting function.
The indoor distributed system that covers settling mode in the conventional chamber has partly comprised two kinds of functions of transmission signals and distribution signal, and this structure can cause adverse effect to radio signal transmission.Radiofrequency signal is transmitted in coaxial cable, and line loss is big, and transmission range is short, and the energy loss of most of radiofrequency signal has only the energy of a small amount of radiofrequency signal to become useful signal covering chamber region of interest within coaxial cable.
And settling mode of the present invention partly is decomposed into two parts with the indoor distributed system that covers settling mode in the conventional chamber, as shown in Figure 3, i.e. and two parts of Optical Fiber Transmission+a plurality of small indoor distributions and/or dispersed and distributed system.After function is separated, Optical Fiber Transmission partly adopts optical fiber to replace coaxial cable, meet light and advance the technology trends that copper moves back, the ultra broadband that utilizes fiber medium to have, super low consumption, dielectric property is finished the transmission from the information source convergence point to each signal access point cheaply, the primary power that radiofrequency signal had has only few part loss in optical fiber, overwhelming majority radio-frequency (RF) energy can be changed into useful signal covering chamber region of interest within, and the radio signal transmission distance greatly prolongs, and can also be transferred to a plurality of discrete target coverage zones (as each production place of the subordinate of iron and steel enterprise simultaneously, the ore field, the dealing plant area's freight train of operation etc. of being dashing about all day day and night); A plurality of small indoor distributed systems are divided into a plurality of small objects areas of coverage with a big target coverage zoning, utilize the mode of a plurality of far-end unit+coaxial cables+distribution antenna to realize that the covering of a plurality of small objects areas of coverage distributes.Be divided into a plurality of small objects areas of coverage, can accurately control the coverage distance and the handoff boundary of each small objects area of coverage.Symbol among the figure
Expression optical fiber; Symbol
The expression antenna.
The tradition indoor distributed system has only driedly puts a node device, and the present invention is made up of multistage node device and connection line.Establish the service set unit on the service node, establish transmission unit on the transmission node, establish user business interface unit on the user node, all nodes all be same bandwidth, etc. capacity; Connection cable between the node all adopts optical fiber.What set up like this will be the station access network network of a perfect full Optical Fiber Transmission, and network configuration is distinct, and is powerful, and networking flexibility is convenient to administer and maintain, and can the minimum cost upgrading.Such premises network will have the strong network management system, can manage the various parameters of the whole system that comprises antenna, monitor each node device and connection line state, be convenient to carry out the network optimization and fault judgement.The management function of network management monitoring as shown in Figure 4.
In addition, the present invention is transformed to a plurality of parallel micropower multiplying arrangements (user business interface unit) with single high-power multiplying arrangement (dried putting or the repeater).
The tradition indoor distributed system adopts the powerful dried equipment of putting, and the adverse effect that causes comprises: equipment radio-frequency radiation to external world itself and interference are big, the powerful dried equipment cost height of putting, the linearity can be cannot say for sure to demonstrate,prove, big to the lifting of making an uproar of the end of base station, serious interference base station equipment, electricity consumption of equipment is big.The present invention adopts a plurality of parallel micropower user business interface units to replace single high-power multiplying arrangement, the favorable factor of Chan Shenging comprises like this: equipment radio-frequency radiation to external world itself and interference are little, the micropower equipment cost is low, linearity excellence, little to the lifting of making an uproar of the end of base station, little to the interference of base station equipment, adopt preposition LNA near antenna, to improve the receiving sensitivity (the similar tower of principle is put) of base station, reduce the transmitting power of mobile phone.
The system schema that the present invention proposes can solve three problems that propose in the background technology, and is specific as follows:
Planning problem: can be at indoor customization frequency, the user business interface unit power output can be easy to controlled microwave and leak by software control, reduces and disturbs; Because the user business interface unit power output is constant, need not to carry out complicated power budget when the network capacity extension and transformation.
Covering problem: the preposition LNA technology by user business interface unit has been improved upstream noise, has promoted the quality of reception of system.
Capacity problem: can improve upstream noise, reduce the influence that traffic is absorbed.A plurality of frequencies can be combined in the sub-district and use, use in a plurality of sub-districts respectively than same a plurality of frequencies and can improve capacity.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1. a system that realizes user net area industry control message transmission is characterized in that, comprising:
The service set unit through modulation, up-conversion, closes the industry control information data road with the radiofrequency signal of other various information sources after changing to rf signal, and converts light signal to, exports after being divided into maximum 8 road light signals by optical branching device again; Convert the multipath light signal that receives to the signal of telecommunication by light/electric conversion respectively, behind synthetic one road signal of telecommunication of mixer, isolate the rf signal of industry control information data and after down-conversion, demodulation, export;
User business interface unit, the light signal that is used for receiving is reduced to rf signal by light/electric conversion, export by duplexer after amplifying through filtering, compensation, be sent to the user that aerial radiation is given the respective coverage areas territory through feeder line, wherein industry control information is reduced into industry control information and is sent to corresponding user through down-conversion, demodulation; The industry control information data through modulation, up-conversion, is closed the road with the multi-service uplink radiofrequency signal after changing to rf signal, and be converted to light signal output.
2. system according to claim 1 is characterized in that, this system further comprises:
Transmission unit, the light signal that is used for receiving is reduced to rf signal by light/electric conversion, after compensation is amplified, remap into light signal again, be divided into maximum 8 road light signals, deliver to maximum 8 next stage transmission units or user business interface unit by optical branching device; Maximum 8 road light signals are become the signal of telecommunication by the photoelectric transformer of correspondence respectively, after synthetic one road signal of telecommunication and compensation are amplified, become the output of one road light signal again through electro-optical conversion again, deliver to upper level transmission unit or service set unit.
3. system according to claim 2 is characterized in that described transmission unit is divided into multistage, and each grade transmission unit provides maximum 8 branch support interfaces downwards, can hang maximum 8 next stage transmission units or user business interface unit down.
4. a method that realizes user net area industry control message transmission is characterized in that, comprising: on down direction,
The industry control information data through modulation, up-conversion, is closed the road with the radiofrequency signal of other various information sources after changing to rf signal, and converted light signal to, export after being divided into maximum 8 road light signals by optical branching device again; The light signal that receives is reduced to rf signal by light/electric conversion, export by duplexer after amplifying through filtering, compensation, be sent to the user that aerial radiation is given the respective coverage areas territory through feeder line, wherein industry control information is reduced into industry control information and is sent to corresponding user through down-conversion, demodulation;
On up direction,
The industry control information data through modulation, up-conversion, is closed the road with the multi-service uplink radiofrequency signal after changing to rf signal, and be converted to light signal output; Convert the multipath light signal that receives to the signal of telecommunication by light/electric conversion respectively, behind synthetic one road signal of telecommunication of mixer, isolate the rf signal of industry control information data and after down-conversion, demodulation, export.
5. method according to claim 4 is characterized in that, this method further comprises:
On down direction, the light signal that receives is reduced to rf signal by light/electric conversion, after compensation is amplified, remap into light signal again, be divided into maximum 8 road light signals, deliver to maximum 8 next stage transmission units or user business interface unit by optical branching device;
On up direction, maximum 8 road light signals are become the signal of telecommunication by the photoelectric transformer of correspondence respectively, after synthetic one road signal of telecommunication and compensation are amplified, become the output of one road light signal again through electro-optical conversion again, deliver to upper level transmission unit or service set unit.
6. according to claim 4 or 5 described methods, it is characterized in that this method further comprises:
With the level of the rf signal of each information source adjust to unanimous on the whole after, deliver to service set unit corresponding input end.
7. method according to claim 6 is characterized in that, radiofrequency signals described and various information sources are closed the road and specifically comprised:
By microwave passive signal combiner the rf signal of the multiple communication standard of each information source is closed the road, move the industry control information data signal to the wide band radio-frequency frequency range through modulators modulate and frequency translation simultaneously, and close the road with the described rf signal that closes the road.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571212A (en) * | 2012-02-08 | 2012-07-11 | 深圳国人通信有限公司 | Indoor optical fiber distribution system |
| CN112466108A (en) * | 2020-12-19 | 2021-03-09 | 爱克斯维智能科技(苏州)有限公司 | Engineering machinery beyond-visual-range remote control method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101321020A (en) * | 2008-07-02 | 2008-12-10 | 武汉虹信通信技术有限责任公司 | Optical fiber distribution system used for multi-communication standard access and its control method |
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- 2009-02-20 CN CN200910078428A patent/CN101815306A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101321020A (en) * | 2008-07-02 | 2008-12-10 | 武汉虹信通信技术有限责任公司 | Optical fiber distribution system used for multi-communication standard access and its control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571212A (en) * | 2012-02-08 | 2012-07-11 | 深圳国人通信有限公司 | Indoor optical fiber distribution system |
| CN102571212B (en) * | 2012-02-08 | 2015-10-14 | 深圳国人通信股份有限公司 | Indoor optical fiber distribution system |
| CN112466108A (en) * | 2020-12-19 | 2021-03-09 | 爱克斯维智能科技(苏州)有限公司 | Engineering machinery beyond-visual-range remote control method and system thereof |
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Application publication date: 20100825 |