CN100542116C - Rail train real-time video monitoring system based on the WLAN technology - Google Patents
Rail train real-time video monitoring system based on the WLAN technology Download PDFInfo
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- CN100542116C CN100542116C CNB2007100525423A CN200710052542A CN100542116C CN 100542116 C CN100542116 C CN 100542116C CN B2007100525423 A CNB2007100525423 A CN B2007100525423A CN 200710052542 A CN200710052542 A CN 200710052542A CN 100542116 C CN100542116 C CN 100542116C
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Abstract
The invention discloses a kind of rail train real-time video monitoring system, relate to a kind of rail train real-time video monitoring system based on the WLAN technology.The present invention includes the video acquisition subsystem (100), wireless transmission subsystem (200), the Monitor And Control Subsystem (300) that are communicated with successively; Video acquisition subsystem (100) is responsible for the video acquisition on the train; Wireless transmission subsystem (200) is responsible for video flowing is passed to via radio reception device the data receiving processor of Surveillance center; Monitor And Control Subsystem (300) is responsible for data flow is distributed to each monitor client through streaming media server.The present invention is applicable to the monitoring remote video in the high-speed track train, other mobile video monitor on the contrast market, and image is more clear to link up, can be handling strong, and can conveniently check in train and Surveillance center's store video video recording simultaneously.
Description
Technical field
The present invention relates to a kind of rail train real-time video monitoring system, particularly a kind of rail train real-time video monitoring system based on the WLAN technology.
Background technology
High-speed rail transportation (underground railway, elevated railway and monorail traffic etc.) with its quickly and easily advantage become one of main direction of future city transport development.
In order to realize the wireless transmission of the video information of real time status in the track train, its implementation has two kinds usually:
First kind is to utilize special microwave channel to come the transportation simulator vision signal, this implementation method must be built special microwave relay station to realize effective covering of microwave signal, the capital construction in early stage and the maintenance in later stage have high input, though can guarantee picture quality, realize that the multichannel while transmission cost of bulky systems is huge.
Second kind is based on the public mobile communication net and comes the transmission digital video signal.This implementation method is to utilize existing public mobile communication network, though cost has reduced, because the restriction of bandwidth, every width of cloth image rate can only reach about 70K/bps, therefore greatly reduces picture quality.
At present, the WLAN technology extensively applies to wireless video monitoring system, and its advantage is to have bigger bandwidth (maximum can reach 56M/bps); But major part just applies to the monitoring of static video point rather than mobile video point.What the WLAN technology was used is public frequency range, so if other wireless user is arranged using similar frequency bands in same environment, just may produce problem of co-channel interference.
Wireless transmission medium generally speaking all is to adopt antenna, and the signal cover of antenna has stronger uncontrollability, also may the inhibit signal connection not disconnect in the zone of weak output signal, and the picture quality of this moment has not met monitoring requirement fully.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming and defect that prior art exists, a kind of rail train real-time video monitoring system based on the WLAN technology is provided.The present invention is relative, and the microwave channel transmission greatly reduces cost, and the public network transmission has promoted the network bandwidth significantly and improved picture quality relatively, and can realize the monitoring in real time continuously simultaneously of multiple row car.
The object of the present invention is achieved like this:
With the WLAN (wireless local area network) is transmission system, lay the base station along the line at track, between the base station with leaky cable (cable let out in abbreviation) as wireless transmission medium, the video data stream after the video encoder encodes compression is sent to cable LAN by radio reception device (wireless transmission end and base station).Pass to streaming media server through receiving after data processor reduces to the data flow of receiving, by streaming media server video data stream is distributed to each Surveillance center's client again and shows real time video image.The present invention can apply to the real-time video monitoring of various track trains widely, for example monitoring in the car of light rail, subway, train etc.
1, employing is after analog signal is adopted the digital coding compression, to transmit by WLAN (wireless local area network) based on the digital video monitoring of WLAN technology.It provides higher bandwidth, guarantees the vision signal of high quality.Transmit next video flowing through after decoding by WLAN (wireless local area network), be transferred to Monitor And Control Subsystem in cable LAN, Monitor And Control Subsystem has been realized the real-time broadcast of video flowing, can also store easily and the retrieve video content.
2, on the basis of cable LAN supervisory control system, utilize WLAN to carry out data flow transmission, reduced the cost of network struction, strengthened the flexibility and the expandability of supervisory control system simultaneously greatly.
3, the base station of orbit monitoring is set up and must in order to solve the problem that multipath disturbs, be adopted the radio reception device of OFDM modulation technique along a plurality of base stations of track laying, has strengthened the anti-multipath interference performance, and diffracting power is further improved.
4, the frequency range of WLAN technology use is public frequency range, the wireless transmission medium of Cai Yonging all is an antenna generally speaking, and consider the particularity of track traffic, the signal of considering the signal overlap district switch and same environment in the frequency interference problem, adopt leaky cable to carry out track and cover, its benefit is:
1. can reduce the signal shade and block, in the track of complexity, if adopt spaced antenna, may be subjected to blocking between certain specific antenna in car internal antenna and the track cause covering bad;
2. the signal fluctuation scope reduces, and adopts leaky cable to compare with the antenna system that adopts other, and signal covers more even in the track;
3. can provide covering simultaneously to multiple service; consider in the tunnel and use a plurality of wireless systems (as paging system, warning system, broadcasting, mobile phone) through regular meeting; they can share a leaky cable, greatly reduce the complexity of constructing when setting up a plurality of wireless system.
In a word, the present invention adopts the method realization that cable LAN and WLAN (wireless local area network) combine.Front end video acquisition and terminal monitoring utilize cable LAN to realize; Consider the mobility of train, being connected between front end video acquisition and the terminal monitoring adopts WLAN (wireless local area network) to realize.
Specifically,
As Fig. 1, the present invention includes the video acquisition subsystem (100), wireless transmission subsystem (200), the Monitor And Control Subsystem (300) that are communicated with successively;
Video acquisition subsystem (100) is responsible for the video acquisition on the train, and the analog video signal of camera is become digital signal by coder transitions, passes to data acquisition server by switch on the car again;
Wireless transmission subsystem (200) is responsible for the video flowing in the data acquisition server is passed to via radio reception device (wireless transmission end and base station) data receiving processor of Surveillance center;
The data flow that Monitor And Control Subsystem (300) is responsible for data receiving processor is received is distributed to each monitor client through streaming media server, is play after with video data stream decoding by monitor client, thereby reaches the purpose of wireless real-time monitoring.
The present invention has following advantage and good effect:
1. terminal adopts digital video code as video capture device, is adapted at constructing local network in the large-scale mobile vehicle of this class of train, and video encoder makes video flowing be adapted at more transmitting in the limited bandwidth through compression algorithm efficiently.
2. adopt data processor to focus on and send video stream data, can make this system be applicable to various video encoder and radio reception device more neatly.
3. adopt seamless soft handover method successfully to solve to switch in the big data quantity wireless transmitting system or problem that switching time is long.
4. adopt leaky cable to carry out track and cover, it is more even that signal is covered, and reduce and disturb, and can the shared leaky cable of a plurality of wireless systems, saved cost.
5. the present invention is applicable to the monitoring remote video in the high-speed track train, other mobile video monitor on the contrast market, and image is more clear to link up, can be handling strong, and can conveniently check in train and Surveillance center's store video video recording simultaneously.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Wherein:
100-video acquisition subsystem,
The 110-camera,
The 120-video encoder,
Switch on the 130-car,
The 140-data acquisition server,
Monitor client on the 150-car;
200-wireless transmission subsystem,
210-frequency range f1 wireless transmission end,
220-frequency range f2 wireless transmission end,
230-frequency range f1 antenna,
240-frequency range f2 antenna,
250-wireless digital microwave,
The 260-leaky cable,
270-frequency range f1 base station,
280-frequency range f2 base station;
The 300-Monitor And Control Subsystem,
310-Surveillance center switch,
The 320-data receiving processor,
The 330-streaming media server,
330-Surveillance center client.
Fig. 2 is an embodiment of the invention schematic diagram.
Wherein:
The A-train
The B-base station.
English to Chinese:
1. WLAN (wireless local area network) WLAN:(Wireless Local Area Network).Refer to that the employing wireless communication technology is interconnected with computer equipment, formation can the mutual communication and the network system that realizes resource-sharing.The characteristics of WLAN (wireless local area network) essence are not re-use telecommunication cable computer and network is coupled together, but connect by wireless mode, thereby make moving of the structure of network and terminal more flexible.
2. orthogonal frequency division multiplexi OFDM:(Orthogonal Frequency Division Multiplexing).It adopts a kind of discontinuous multi-tone technology, and a large amount of signals that will be called as in the different frequency of carrier wave are merged into single signal, transmits thereby finish signal.Because this technology has under noise jamming the ability that transmits signal, therefore usually can be used in and be subjected to easily in the relatively poor transmission medium of external interference or opposing external interference ability.
3. MPEG4: be the moving picture expert group (MPEG) of ISO/IEC announce the 4th generation video, audio coding standard.
4. H.264: a new digital video coding standard of joint video team (JVT:joint videoteam) exploitation that is the moving picture expert group (MPEG) of the video coding expert group (VCEG) of ITU-T and ISO/IEC, it be ITU-T H.264, be again the 10th part of the MPEG-4 of ISO/IEC.
Embodiment
Be example with the light rail train below, specify embodiments of the present invention.
The present invention combines cable LAN and WLAN (wireless local area network) neatly, has realized the monitoring and the management of the HD image on the mobile vehicle.
One, the structure of each subsystem
1, video acquisition subsystem (100)
As Fig. 1 top, video acquisition subsystem (100) is formed a cable LAN, comprises on camera (110), video encoder (120), the car monitor client (150) on switch (130), data acquisition server (140), the car;
Switch (130) connects successively on camera (110), video encoder (120), the car; Switch on the car (130) respectively with data acquisition server (140), car on monitor client (150) interconnect.
Video encoder (120) collects the vision signal of camera (110), convert it to digital signal, again through MPEG4 or H.264 waits compression algorithm is efficiently transmitted video stream compression for lower suitable WLAN (wireless local area network) video flowing to pass to data acquisition server (140) again.
Data acquisition server (140) is mainly finished following three functions:
1. the video flowing of receiving is stored, can be for checking at any time.
2. the video flowing of receiving is distributed to monitor client on the car (150), for situation in the train crews monitoring car.
3. the video flowing of receiving is transferred to wireless terminal device, passes to ground by wireless transmission subsystem (200) again.
As required, two cameras (110) are installed in a joint compartment; Camera (110) is the top camera of inhaling commonly used.
Video encoder (120) connects one or more cameras (110) by video interface, in order to save cost, generally adopts multi-channel video encoder (two-way or four tunnel), for example Haikang DS-6000 series.
Switch on the car (130) has the listing product, as the D-LINK 100 m switch for switch commonly used.
Data acquisition server (140) has the listing product, as North China industry control NORCO-MB4KL for industrial computer commonly used.
Monitor client on the car (150) has the listing product for monitoring industrial computer commonly used.
2, wireless transmission subsystem (200)
As Fig. 1 middle part, wireless transmission subsystem (200) comprises frequency range f1 wireless transmission end (210), frequency range f2 wireless transmission end (220), frequency range f1 antenna (230), frequency range f2 antenna (240), wireless digital microwave (250), leaky cable (260), frequency range f1 base station (270), frequency range f2 base station (280);
Frequency range f1 wireless transmission end (210), frequency range f1 antenna (230), wireless digital microwave (250), leaky cable (260), frequency range f1 base station (270) are communicated with successively;
Frequency range f2 wireless transmission end (220), frequency range f2 antenna (240), wireless digital microwave (250), leaky cable (260), frequency range f2 base station (280) are communicated with successively;
Comparatively general on the market base station signal coverage mode replaces covering (two frequency ranges must have the overlapping region) with two kinds of different frequency range f1 and f2 usually at present, when on the train just during wireless transmission end entering signal overlapping region in high-speed mobile, have only when one of them frequency band signals faintly when unavailable, just can switch to another frequency range.And the time interval that a common frequency range switches to another frequency range generally all more than Millisecond, even reach a second level.Will lose a large amount of video packets of data during this section, cause image extremely discontinuous, a period of time that even more serious is before switching, just can not in time transmit the video flowing of big data quantity, caused picture quality seriously to descend.
Consider the overlong time that same wireless transmission end switches between two base stations, effective signal switches in the time of can not satisfying running train and run at high speed, and wireless transmission subsystem of the present invention has adopted seamless soft handover method to solve this difficult problem:
If the wireless transmission end of high-speed mobile is in the non-signal overlap zone of frequency range f1 base station (270) and frequency range f2 base station (280), the data acquisition server (140) of video acquisition subsystem (100) sends video data to the base station by the wireless transmission end of one of them effective frequency range of frequency range f1 wireless transmission end (210) and frequency range f2 wireless transmission end (220).
Signal overlap zone in frequency range f1 base station (270) and frequency range f2 base station (280), the data acquisition server (140) of video acquisition subsystem (100) sends video data to frequency range f1 base station (270) and frequency range f2 base station (280) simultaneously by frequency range f1 wireless transmission end (210) and frequency range f2 wireless transmission end (220).
Frequency range f1 base station (270) and frequency range f2 base station (280) upload to video data stream by cable LAN transmission mediums such as optical fiber the data receiving processor (320) of Monitor And Control Subsystem (300); Data receiving processor (320) is done a buffer memory to video data stream, reject the data flow that repeats simultaneously, guarantee that data flow is transferred to the Monitor And Control Subsystem (300) on ground pellucidly from the video acquisition subsystem (100) of train after set time section of buffer memory.
This method is seen our company " wireless video or large data stream seamless soft handover implementation method under the high-speed mobile environment " (applying date 2005-12-26, application number 200510120526.4, publication number CN1801777A).
In this subsystem,
The radio reception device with OFDM modulation technique is all adopted in frequency range f1 wireless transmission end (210), frequency range f2 wireless transmission end (220), frequency range f1 base station (270) and frequency range f2 base station (280), for example the easily logical ANYKEY series of products in rich room, Beijing.
Frequency range f1 antenna (230), frequency range f2 antenna (240) adopt common 2.4G or 5.6G (depending on the frequency range that whole system adopts) antenna to get final product.
Leaky cable (260) adopts 2.4G commonly used or 5.6G (depending on the frequency range that whole system adopts) available leaky cable, for example RLKU158-50JFNA of An Fushi (RFS) as the wireless transmission instrument.
Wireless digital microwave (250) promptly refers to the media that radio reception device is used to transmit.
3, Monitor And Control Subsystem (300)
As Fig. 1 bottom, Monitor And Control Subsystem (300) comprises Surveillance center's switch (310), data receiving processor (320), streaming media server (330), Surveillance center's client (340);
Surveillance center's switch (310) is connected with data receiving processor (320), streaming media server (330), Surveillance center's client (340) respectively.
The data receiving processor (320) of Monitor And Control Subsystem (300) is transferred to streaming media server (330) with the video flowing that receives; Streaming media server (330) is finished following function:
1. the video flowing of receiving is stored, can be for checking at any time.
2. the video flowing of receiving is distributed to Surveillance center's client (340), monitors situation in the car for the staff.
Monitor And Control Subsystem (300) has been realized train real time monitoring and control, storage, inquiry and playback, electronic chart, streaming media server distribution and cascade, program management and deploy troops on garrison duty and withdraw a garrison, functions such as grouping management and taking turn, abundant application system interface flexibly also is provided.
Surveillance center's switch (310) adopts the TP-LINK 100 m switch.
Data receiving processor (320) and streaming media server (330) are selected North China industry control NORCO-MB4KL for use,
Surveillance center's client (340) is monitoring industrial computer commonly used.
As Fig. 2, embodiments of the invention comprise train (A) and base station (B) and video acquisition subsystem (100), wireless transmission subsystem (200), Monitor And Control Subsystem (300) on it are set.
Two, embodiment
Present embodiment comprises train (A), base station (B) and three subsystems on it is set.
1, train (A) is provided with the car top of video acquisition subsystem (100) and wireless transmission subsystem (200); The car top of wireless transmission subsystem (200) comprises frequency range f1 wireless transmission end (210), frequency range f2 wireless transmission end (220), frequency range f1 antenna (230), frequency range f2 antenna (240).
Three functions of main realization:
1. gather video flowing;
2. onboard the monitor client of (A) (150) shows realtime graphic
3. video flowing is distributed to the base station (B) on ground by frequency range f1 wireless transmission end (210), frequency range f2 wireless transmission end (220), frequency range f1 antenna (230), frequency range f2 antenna (240).
2, base station (B) is provided with the above ground portion and the Monitor And Control Subsystem (300) of wireless transmission subsystem (200); The above ground portion of wireless transmission subsystem (200) comprises leaky cable (260), frequency range f1 base station (270), frequency range f2 base station (280).
The main function that realizes is:
Receive the video flowing that the wireless transmission end (210,220) on the train (A) transmits and it is transferred to Monitor And Control Subsystem (300) and handle.
Claims (2)
1, a kind of rail train real-time video monitoring system based on the WLAN technology comprises video acquisition subsystem (100) and Monitor And Control Subsystem (300);
Video acquisition subsystem (100) is responsible for the video acquisition on the train, and the analog video signal of camera is become digital signal by coder transitions, passes to data acquisition server by switch on the car again;
The data flow that Monitor And Control Subsystem (300) is responsible for data receiving processor is received is distributed to each monitor client through streaming media server, is play after with video data stream decoding by monitor client, thereby reaches the purpose of wireless real-time monitoring;
It is characterized in that:
Be provided with wireless transmission subsystem (200), video acquisition subsystem (100), wireless transmission subsystem (200) and Monitor And Control Subsystem (300) are communicated with successively;
Wireless transmission subsystem (200) is responsible for the video flowing in the data acquisition server is passed to the data receiving processor of Monitor And Control Subsystem; Its structure is:
Frequency range f1 wireless transmission end (210), frequency range f1 antenna (230), wireless digital microwave (250), leaky cable (260), frequency range f1 base station (270) are communicated with successively;
Frequency range f2 wireless transmission end (220), frequency range f2 antenna (240), wireless digital microwave (250), leaky cable (260), frequency range f2 base station (280) are communicated with successively.
2, by the described rail train real-time video monitoring system of claim 1, it is characterized in that also comprising train (A) and base station (B):
Train (A) is provided with the car top of video acquisition subsystem (100) and wireless transmission subsystem (200); The car top of wireless transmission subsystem (200) comprises frequency range f1 wireless transmission end (210), frequency range f2 wireless transmission end (220), frequency range f1 antenna (230), frequency range f2 antenna (240);
Base station (B) is provided with the above ground portion and the Monitor And Control Subsystem (300) of wireless transmission subsystem (200); The above ground portion of wireless transmission subsystem (200) comprises leaky cable (260), frequency range f1 base station (270), frequency range f2 base station (280).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100525423A CN100542116C (en) | 2007-06-25 | 2007-06-25 | Rail train real-time video monitoring system based on the WLAN technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100525423A CN100542116C (en) | 2007-06-25 | 2007-06-25 | Rail train real-time video monitoring system based on the WLAN technology |
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| Publication Number | Publication Date |
|---|---|
| CN101083583A CN101083583A (en) | 2007-12-05 |
| CN100542116C true CN100542116C (en) | 2009-09-16 |
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| CNB2007100525423A Expired - Fee Related CN100542116C (en) | 2007-06-25 | 2007-06-25 | Rail train real-time video monitoring system based on the WLAN technology |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102196248B (en) * | 2011-05-04 | 2013-06-12 | 杭州海康威视系统技术有限公司 | Mobile video monitoring system and method |
| CN102355570A (en) * | 2011-08-09 | 2012-02-15 | 中广核检测技术有限公司 | Remote monitoring system for nondestructive testing of nuclear power station |
| CN102291570B (en) * | 2011-08-09 | 2016-05-18 | 谢惠麟 | For wireless supervisory control system and the method for subway |
| CN104735394B (en) * | 2013-12-19 | 2019-03-05 | 广州地铁集团有限公司 | A kind of VOD method and system for municipal rail train |
| CN103957388A (en) * | 2014-05-09 | 2014-07-30 | 上海威锐电子科技有限公司 | Driving test third subject WLAN transmission device |
| CN105163094B (en) * | 2015-10-12 | 2018-10-16 | 华中科技大学 | A kind of track traffic video monitoring system |
| CN106302214A (en) * | 2016-08-22 | 2017-01-04 | 刘永锋 | Sport ball field data transmission system |
| CN106851363B (en) * | 2017-02-28 | 2019-06-28 | 大连理工大学 | A kind of subway train stream media service system based on PIS data |
| CN107770494A (en) * | 2017-10-27 | 2018-03-06 | 深圳市文立科技有限公司 | Wild animal monitoring system |
| CN109144012A (en) * | 2018-10-08 | 2019-01-04 | 陕西龙门钢铁有限责任公司 | A kind of frequency conversion driving conditions control intelligent monitor system and monitoring method |
| CN113497751B (en) * | 2020-03-19 | 2022-10-25 | 中车唐山机车车辆有限公司 | Network system for rail train and rail train |
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