CN103179007A - Integrated-design dual-channel-redundant train-ground two-way wireless communication device - Google Patents
Integrated-design dual-channel-redundant train-ground two-way wireless communication device Download PDFInfo
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- CN103179007A CN103179007A CN2013100906026A CN201310090602A CN103179007A CN 103179007 A CN103179007 A CN 103179007A CN 2013100906026 A CN2013100906026 A CN 2013100906026A CN 201310090602 A CN201310090602 A CN 201310090602A CN 103179007 A CN103179007 A CN 103179007A
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Abstract
The invention discloses an integrated-design dual-channel-redundant train-ground two-way wireless communication device. The device comprises a case, antenna modules and signal processing circuit boards, wherein the case is provided with an upper-layer cavity body and a lower-layer cavity body which are stacked; an antenna cavity body and a circuit cavity body are formed inside the upper-layer cavity body; the antenna cavity body is arranged at the upper end of the upper-layer cavity body and comprises an antenna module which is used for transceiving wireless signals; the circuit cavity body is arranged at the lower end of the upper-layer cavity body and comprises a signal processing circuit board which is connected with the antenna module and is used for carrying out signal processing; and the lower-layer cavity body comprises an antenna cavity body and a circuit cavity body which are arranged by being symmetrical to those of the upper-layer cavity body. According to the device disclosed by the invention, the local two-way wireless communication between a train and the ground can be good in universality, high in real time, high in interference resistance, high in speed and redundant in configuration.
Description
Technical field
The present invention relates to the urban track traffic field, relate in particular to the binary-channel redundancy car ground two-way radio communication device of integrated design.
Background technology
Along with the fast development of the communication technology and information technology, computer carries out data traffic exchange by wireless channel, and oneself is widely used in the various fields such as industry, business, traffic, military affairs.Current wireless network communication system extensively adopts spread spectrum technic, and domestic Wireless Management Committee is with open industry, science and medical field (ISM) frequency range for freely using of 2.4～2.4835GHz frequency range.The data communication technology based on the 2.4G ISM band take different systems such as WLAN (wireless local area network) (IEEE802.11.a/b/g), bluetooths (IEEE802.15.1) as representative develops rapidly especially, the time be engraved in work and the life that is facilitating us.
In the urban track traffic field, wireless communication technology also is applied in comprising the different systems such as signal of communication, dispatch control, public security fire-fighting, mobile communication and passenger information issue.Constantly keep the exchanges data that between subway train and ground installation, high speed is stable to become basis and the prerequisite of guaranteeing subway passenger-traffic system high-efficiency operation.In prior art, realize in the regional area scope (for example: car ground station platform) (train and ground) communicates by letter, and mainly comprises following three kinds of modes:
1) adopt the WLAN wireless LAN communication.The method is the vehicle-ground wireless communication mode that generally use in current urban track traffic field.Its principle is: usually other the keeping at a certain distance away of ground rail, some AP (WAP (wireless access point)) are set, and the outside directional antenna that connects, the vehicle-mounted independent AP unit that arranges, roof arranges corresponding directional antenna, completes two-way communication.Because the wlan device integrated level is not high, equipment installation site dispersion needs radio frequency cable interconnected, and is large to the space requirement amount, and Electro Magnetic Compatibility is more difficult to be satisfied.
2) train-ground communication loop wire.Its principle is: usually in the platform zone along laying the communication loop line cable of certain-length between two one steel rails, train bottom lifting induction antenna is realized car ground half-duplex operation.But owing to there is no unified International Standard, the communication loop line products of different manufacturers comprises that working frequency range, modulation system, traffic rate, communication protocol are not quite similar; Real-time and message capacity all are difficult to support sophisticated functions to be used.
3) inquiry response device.Its principle is: by in ground rail central authorities, transponder antenna being set, the requestor antenna is installed by train set section, makes transponder set up working power by the power signal of requestor radiation, and the data of storing in it are read out, realize car ground information alternately.But the inquiry response device only can be realized " point " formula zone (being generally 1 meter left and right) communication, and train leaves the transponder antenna induction zone can't keep communication, and only can realize to the one-way communication of car.
Summary of the invention
The binary-channel redundancy car ground two-way radio communication device that the purpose of this invention is to provide integrated design has realized that between train and ground, versatility is good, real-time is high, antijamming capability is strong, speed is higher, the locality of redundant configuration (in 20 meters scopes) two-way wireless communication.
The objective of the invention is to be achieved through the following technical solutions:
The binary-channel redundancy car ground two-way radio communication device of integrated design, this device comprises: cabinet, Anneta module, signal processing circuit board; Wherein, described cabinet has the two-layer stacking cavity in up and down; Described upper strata inside cavity comprises antenna chamber and circuit cavity; Described antenna chamber is positioned at the upper end of upper strata cavity, comprises the Anneta module for the transmitting/receiving wireless signal; Described circuit cavity is positioned at the lower end of upper strata cavity, comprises being connected and being used to carry out the signal processing circuit board that signal is processed with Anneta module; Described lower floor cavity comprises antenna chamber and the circuit cavity with upper strata cavity symmetry arrangement.
As seen from the above technical solution provided by the invention, device of the present invention is based on the integrated universal structure design of dual chamber, overall structure is small and exquisite, and realized the General design of ground and mobile unit, for rail traffic signal system provides real-time, transparent vehicle-ground wireless communication channel; On the other hand, by monomer binary-channel redundancy Circnit Layout scheme, avoided single main frame break down and communication disruption occurs.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
The schematic diagram of a kind of signal processing circuit board that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of two-way wireless communication between a kind of train that Fig. 2 provides for the embodiment of the present invention and ground;
The schematic diagram that Fig. 3 provides for the embodiment of the present invention a kind of cab signal system communicates by letter with the trackside signal system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the present invention provides a kind of binary-channel redundancy car ground two-way radio communication device of integrated design, its radio communication has adopted and has met the IEEE802.15.4WPAN(wireless personal domain network) the purple honeybee of the ZigBee(of international standard) agreement, work in 2.4GHz ISM(industry, science, medical treatment) frequency range is a kind of general-purpose system that can realize train-ground bidirectional communication.It is to use for track traffic to provide regional wireless coverage (for example: platform, the rail of turning back, conversion rail) that its typical case uses, for the Urban Rail Transit Signal control system provides real-time, transparent vehicle-ground wireless communication alternate channel, also can be used for building a base communication device of connection formula train control system, realize platform screen door joint control, speed limit, the state ground information interaction of waiting for bus.
Embodiment
The embodiment of the present invention provides the binary-channel redundancy car ground two-way radio communication device of integrated design, and this device comprises: cabinet, Anneta module, signal processing circuit board; Wherein, described cabinet has the two-layer stacking cavity in up and down; Described upper strata inside cavity comprises antenna chamber and circuit cavity; Described antenna chamber is positioned at the upper end of upper strata cavity, comprises the Anneta module for the transmitting/receiving wireless signal; Described circuit cavity is positioned at the lower end of upper strata cavity, comprises being connected and being used to carry out the signal processing circuit board that signal is processed with Anneta module; Described lower floor cavity comprises antenna chamber and the circuit cavity with upper strata cavity symmetry arrangement.
Described circuit cavity comprises: two covers are equity and the independent signal processing circuit board that arranges physically.
Described Anneta module comprises: the working frequency range that two covers adopt plate to carry solid-state design is the directional antenna of 2.4GHz, and is connected with described two cover signal processing circuit boards respectively by feeder.
Described signal processing circuit board comprises: radio frequency processing module, core processing module and base plate; Wherein, described radio frequency processing module is used for the power of wireless signal is processed; Described core processing module is used for wireless signal is processed; Described base plate is used for fixing and the connecting interface of power supply and external equipment is provided for described radio frequency processing module and core processing module.
Described radio frequency processing module is carried out radio communication for the Zigbee protocol based on IEEE802.15.4 wireless personal domain network WPAN international standard.
Described core processing module is embedded core processing module, and establishes μ C/OS-II real time operating system in it.
Described cabinet is the cuboid structure; Wherein, a side is provided with for the aviation plug that is connected with external equipment and earth stud, and the another side is provided with the water-proof ventilation respirator; The two ends of its end face are respectively equipped with two installing holes, and the end face radio-frequency transmissions district cover plate that is provided with also that the halogen Merlon pmma material of a rectangle makes; Its bottom surface is the detachable metal cover plate, and surrounding is provided with the waterproof adhesive tape protection that groove is installed.
More than for realizing chief component and the structure of the device of radio communication between train and ground in the present embodiment.This device can be arranged on ground rail central authorities and train bottom and realize radio communication, so can farthest guarantee the versatility of equipment, reduces the maintenance cost of following application.Wherein, during as vehicular communication unit, the general support lifting mode that adopts is installed on bottom train, is installed on the railway roadbed center line by support during as terrestrial communication device.
For the ease of understanding, the below does specific description to this radio communication device.
The cabinet integral of the binary-channel redundancy car ground two-way radio communication device (hereinafter to be referred as the train-ground communication device) of the integrated design that the present embodiment provides adopts the processing of aviation aluminium section bar, has good EMC (Electro Magnetic Compatibility) performance.Global design is the cuboid structure, and by the aviation plug of cabinet one side installation, outgoing cable is connected with other equipment, for example, Ethernet, CAN(controller local area network), RS422/485 interface etc., also be designed with simultaneously earth stud, be used for and be connected the connecting of equipment commonly; The two ends of end face are respectively equipped with two installing holes, the radio-frequency transmissions district cover plate that the halogen Merlon pmma material with fire protecting performance that also has a rectangle of end face is made; The another side also is designed with the water-proof ventilation respirator, both can guarantee the air pressure balance that casing is inside and outside, also can play the water proof and dust proof effect; The casing bottom surface is dismountable cover plate, and surrounding has the waterproof adhesive tape protection.Cabinet integral has the characteristic of fire prevention, resistance to compression, dustproof, waterproof, and its degree of protection can reach the IP66 grade.
The cabinet inside of train-ground communication device is designed to the configuration of monomer binary-channel redundancy, namely comprises the two consistent but separate main frames of cover physical structure, and adopts the double machine parallel working method.Like this, even wherein a cover main frame breaks down, can not affect the communication link between train and ground yet.On structure, this two covers main frame lays respectively in the two-layer stacking cavity in up and down of cabinet inside, and for the dividing plate between the two-layer cavity in up and down, this two covers main frame is symmetry arrangement.
Below mainly be introduced with assembly and the structure of main frame in the cavity of upper strata.The upper strata cavity also is divided into up and down two parts, and the upper end is antenna chamber, and the lower end is the circuit cavity.
The Anneta module that is used for the transmitting/receiving wireless signal has been installed in antenna chamber, and for example, it is the directional antenna of 2.4GHz that Anneta module can adopt working frequency range, and this antenna adopts special PCB (printed circuit board) plate to carry solid-state design.
Installed in the circuit cavity and be connected and be used to carry out the signal processing circuit board that signal is processed with Anneta module; Signal processing circuit board has adopted modularized design, as shown in Figure 1, can comprise radio frequency processing module, core processing module and base plate; Core processing module adopts the porous industrial connector to be connected with base plate with the radio frequency processing module, and reinforces the connection with special nylon set bolt, and the abominable operational environment of vibration is installed to satisfy railway roadbed and car body.Wherein, base plate is mainly used in fixing and the connecting interface of power supply (power supply unit that comprises routine) and external equipment is provided for described radio frequency processing module and core processing module.
The radio frequency processing module is used for the power of wireless signal is processed, and for example, can adopt the IEEE802.15.4WPAN(wireless personal domain network) Zigbee protocol of international standard.ZigBee is a kind of short distance, low-power consumption, intermediate data rate, low cost, highly reliable radio network technique, can be used for the fields such as Industry Control, remote monitoring and building automatic.Its communication standard adopts DSSS direct-sequence spread-spectrum modulation mode, and 16 communication channels that bandwidth is 5MHz are provided in 2.4GHz～2.4835GHz scope; By the RF front-end module of inner high integration, power output can reach+20dBm (100mW), and the radio station receiving sensitivity can reach-103dBm.By the concurrent working of binary channels two-band, and by embedded software communication channel, power and 32 PN codes (pseudorandom spread spectrum code), and AES secure communication protocols, software and hardware CRC(cyclic redundancy code) key Design such as dual check, the dual house dog protection of software and hardware, critical data multiple duplication, can guarantee under abominable field condition, realize that flank speed is the reliable bidirectional data transfers in car ground of 250Kbits/s.
Core processing module is used for wireless signal is processed, and for example, can adopt NXP(grace intelligence Pu semiconductor) the LPC247832 position ARM7-TDMI embedded type CPU of company is as core processing module, establishes μ C/OS-II real time operating system in it.Core processing module has abundant peripheral hardware resource, has comprised the input and output of ON/OFF amount, EEPROM(EEPROM (Electrically Erasable Programmable Read Only Memo)), RTC clock (real-time clock), SDRAM/FLASH(synchronous DRAM/flash memory), house dog, NOR and NAND FLASH(nonvolatile flash memory) mass storage, LCD(liquid crystal display) circuit such as drive circuit, CAN controller local area network fieldbus, RS422/485 communication interface, Ethernet.
Further, can comprise two covers physically equity and independent Anneta module and the signal processing circuit board that arranges in the upper strata cavity of the present embodiment, Anneta module is connected with signal processing circuit board respectively via interior bone by feeder (antenna is to the line between receiver).Further guaranteed by this method the reliability of train-ground communication link.
In addition, the antenna chamber in the main frame of the lower floor's cavity in cabinet and upper strata cavity main frame and circuit cavity symmetry arrangement, the structure of its each assembly of main frame repeats no more.
After the train-ground communication device of the embodiment of the present invention is arranged on respectively train and ground rail, can realize two-way real-time, reliable radio communication between the train-ground installation in the specific region.Take train earthward transmission information as example, referring to Fig. 2, core processing module in vehicle-mounted train-ground communication device receives the data that connected external equipment sends, after these data are carried out preliminary treatment, transfer to the radio frequency processing module, be sent to train-ground communication device on ground rail via Anneta module again, receive this data by the Anneta module in the train-ground communication device on ground rail, and transfer to core processing module via the radio frequency processing module, at this moment, this core processing module is sent to corresponding external equipment according to the data type that receives.Certainly, ground is similar to process and the said process of train message transfer, repeats no more.
Another fermentation, communicating by letter between the cab signal system on train and ground trackside signal system also can be completed based on the train-ground communication device that the embodiment of the present invention provides, can be with cab signal system and the trackside signal system external equipment as the train-ground communication device.Take the cab signal system to trackside signal system transmission information as example, referring to Fig. 3: vehicle-mounted train-ground communication device is after the information that receives the cab signal system, mode by radio spread spectrum communication sends it to the train-ground communication device on ground rail, by trackside TU Trunk Unit, information is imported again the fiber optic network on ground, the fiber optic Ethernet switch is transmitted to indoor host computer with the information of receiving, and sends to the trackside signal system by indoor host computer at last.
Composition structure and the application thereof of the above train-ground communication device that provides for the embodiment of the present invention.It has adopted the monomer binary-channel redundancy Circnit Layout scheme of the integrated universal structure of dual chamber design, and the method for wireless coverage between regional (20 meters scopes in) train-ground installation is provided based on the Zigbee protocol of IEEE802.15.4WPAN international standard and dual-frequency point concurrent working.Compare with prior art and mainly contain following advantage: 1) highly reliable spread spectrum technic.Adopt DSSS Direct Sequence Spread Spectrum Communication technology, channel coding and PN spread spectrum coding in conjunction with the software flexible configuration, high speed anti-interference data link on a plurality of logic channels bases can be provided, than traditional simulation FSK(frequency shift keying) the narrow band communication technology, the anti-multipath jamming performance that it is excellent, highly reliable Information Security and confidentiality are incomparable.2) high secure data encryption technology.The AES(Advanced Encryption Standard) be the standard that American National Standard and technical research are used for the encrypted electronic data.The train-ground communication device that the present embodiment provides has adopted the AES of 128 keys to guarantee the confidentiality of user data in conjunction with proprietary secure communication protocols.3) redundant of high flexible design.The train-ground communication device that the present embodiment provides is the integrated design binary-channel redundancy car ground two-way radio communication device, be adopted as the design of the two cover of monomer hardware redundancy, comprise that directional antenna, radio frequency processing module, core processing module are the physics independent design, can carry out respectively the software configuration by software, make it work in different wireless channels, owing to adopting the double machine parallel working method, hostdown, do not affect the communication link between current track section train and ground host machine arbitrarily.4) software configuration feature flexibly.Configuration tool software with long-range access function can be configured system parameterss such as device id, clock information, channel, power, baud rates.5) General design reduces the life period of equipment O﹠M cost.Vehicle-mounted train-ground communication device and Ground Vehicle ground communicator maintenance compatible design maximize and realize General design having reduced device category, and convenient maintenance and replacement in the future is economic and practical.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (7)
1. the binary-channel redundancy car ground two-way radio communication device of integrated design, is characterized in that, this device comprises: cabinet, Anneta module, signal processing circuit board; Wherein, described cabinet has the two-layer stacking cavity in up and down; Described upper strata inside cavity comprises antenna chamber and circuit cavity; Described antenna chamber is positioned at the upper end of upper strata cavity, comprises the Anneta module for the transmitting/receiving wireless signal; Described circuit cavity is positioned at the lower end of upper strata cavity, comprises being connected and being used to carry out the signal processing circuit board that signal is processed with Anneta module; Described lower floor cavity comprises antenna chamber and the circuit cavity with upper strata cavity symmetry arrangement.
2. device according to claim 1, is characterized in that, described circuit cavity comprises: two covers are equity and the independent signal processing circuit board that arranges physically.
3. device according to claim 2, is characterized in that, described Anneta module comprises: the working frequency range that two covers adopt plate to carry solid-state design is the directional antenna of 2.4GHz, and is connected with described two cover signal processing circuit boards respectively by feeder.
4. according to claim 1-3 described devices of any one, is characterized in that, described signal processing circuit board comprises: radio frequency processing module, core processing module and base plate; Wherein, described radio frequency processing module is used for the power of wireless signal is processed; Described core processing module is used for wireless signal is processed; Described base plate is used for fixing and the connecting interface of power supply and external equipment is provided for described radio frequency processing module and core processing module.
5. device according to claim 4, is characterized in that, described radio frequency processing module is carried out radio communication for the purple honeybee Zigbee protocol based on IEEE802.15.4 wireless personal domain network WPAN international standard.
6. device according to claim 4, is characterized in that, described core processing module is embedded core processing module, and establish μ C/OS-II real time operating system in it.
7. device according to claim 1, is characterized in that, described cabinet is the cuboid structure; Wherein, a side is provided with for the aviation plug that is connected with external equipment and earth stud, and the another side is provided with the water-proof ventilation respirator; The two ends of its end face are respectively equipped with two installing holes, and the end face radio-frequency transmissions district cover plate that is provided with also that the halogen Merlon pmma material of a rectangle makes; Its bottom surface is the detachable metal cover plate, and surrounding is provided with the waterproof adhesive tape protection that groove is installed.
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| CN2013100906026A CN103179007A (en) | 2013-03-20 | 2013-03-20 | Integrated-design dual-channel-redundant train-ground two-way wireless communication device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034960A (en) * | 2014-05-15 | 2014-09-10 | 苏州市万松电气有限公司 | Train-mounted electrical-energy monitoring system with multiple redundancies |
| CN109547974A (en) * | 2018-12-20 | 2019-03-29 | 中国铁道科学研究院集团有限公司通信信号研究所 | A kind of train binary-channel redundancy communication locating device |
| CN110022641A (en) * | 2019-03-14 | 2019-07-16 | 安徽天兵电子科技股份有限公司 | A kind of manufacture craft of radio-frequency front-end high density composite substrate |
| WO2020150857A1 (en) * | 2019-01-21 | 2020-07-30 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method used for the vehicle-mounted antenna system |
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| CN2721477Y (en) * | 2003-10-10 | 2005-08-31 | 北京交通大学 | Station controller of wireless locomotive signal system |
| WO2010139489A1 (en) * | 2009-06-03 | 2010-12-09 | Siemens Aktiengesellschaft | Energy-saving operation of rail vehicles having at least two drive units |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2721477Y (en) * | 2003-10-10 | 2005-08-31 | 北京交通大学 | Station controller of wireless locomotive signal system |
| WO2010139489A1 (en) * | 2009-06-03 | 2010-12-09 | Siemens Aktiengesellschaft | Energy-saving operation of rail vehicles having at least two drive units |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034960A (en) * | 2014-05-15 | 2014-09-10 | 苏州市万松电气有限公司 | Train-mounted electrical-energy monitoring system with multiple redundancies |
| CN109547974A (en) * | 2018-12-20 | 2019-03-29 | 中国铁道科学研究院集团有限公司通信信号研究所 | A kind of train binary-channel redundancy communication locating device |
| CN109547974B (en) * | 2018-12-20 | 2021-11-26 | 中国铁道科学研究院集团有限公司通信信号研究所 | Redundant communication positioner of train binary channels |
| WO2020150857A1 (en) * | 2019-01-21 | 2020-07-30 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method used for the vehicle-mounted antenna system |
| CN112189378A (en) * | 2019-01-21 | 2021-01-05 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method applied to same |
| CN112189378B (en) * | 2019-01-21 | 2022-04-12 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method applied to same |
| CN110022641A (en) * | 2019-03-14 | 2019-07-16 | 安徽天兵电子科技股份有限公司 | A kind of manufacture craft of radio-frequency front-end high density composite substrate |
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Inventor after: Cai Changjun Inventor after: Long Guangqian Inventor after: Tang Rui Inventor after: Zheng Wei Inventor after: Xu Jie Inventor after: Xu Yi Inventor after: Sun Wang Inventor after: Wang Junfeng Inventor after: Wu Liang Inventor after: Wang Lin Inventor after: Li Kejian Inventor after: Gao Hongmin Inventor after: Li Bo Inventor after: Li Jin Inventor after: Jia Xuexiang Inventor after: Zhang Chupan Inventor after: Yin Xunzheng Inventor after: He Ye Inventor after: Jia Peng Inventor before: Gao Hongmin Inventor before: Wang Junfeng Inventor before: Wu Liang Inventor before: Wang Lin Inventor before: Li Kejian Inventor before: Li Bo Inventor before: Jia Xuexiang Inventor before: Yin Xunzheng Inventor before: Jia Peng Inventor before: Zheng Wei Inventor before: Xu Jie Inventor before: Xu Yi Inventor before: Sun Wang |
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Effective date of registration: 20151202 Address after: 100081 Beijing city Haidian District Daliushu Road No. 2 Applicant after: China Academy of Railway Sciences Applicant after: GUANGZHOU METRO GROUP CO., LTD. Applicant after: Signal & Communication Research Institute, China Academy of Railway Sciences Applicant after: Huatie Information Technology Development General Co., Beijing Applicant after: Beijing Ruichi Guotie Intelligent Transport Systems Engineering Technology Co.,Ltd. Address before: 100081 Beijing city Haidian District Daliushu Road No. 2 Applicant before: China Academy of Railway Sciences Applicant before: Signal & Communication Research Institute, China Academy of Railway Sciences Applicant before: Huatie Information Technology Development General Co., Beijing Applicant before: Beijing Ruichi Guotie Intelligent Transport Systems Engineering Technology Co.,Ltd. |
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Application publication date: 20130626 |