CN201639711U - Wireless digital emergency video transmission system - Google Patents
Wireless digital emergency video transmission system Download PDFInfo
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- CN201639711U CN201639711U CN2009202943194U CN200920294319U CN201639711U CN 201639711 U CN201639711 U CN 201639711U CN 2009202943194 U CN2009202943194 U CN 2009202943194U CN 200920294319 U CN200920294319 U CN 200920294319U CN 201639711 U CN201639711 U CN 201639711U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model provides a wireless digital emergency video transmission system, and relates to the technical field of wireless video transmission. The wireless digital emergency video transmission system comprises an individual work bench, a vehicle-mounted station and a control center, and all the parts are connected by a COFDM wireless network. The wireless digital emergency video transmission system adopts the MPEG video compression and decompression technology and the orthogonal coding multi-carrier COFDM modulation and demodulation technology, saves the wireless transmission wide band, solves the problems of frequency deviation and phase noise caused by adopting the OFDM technology, reduction of power efficiency of a radio-frequency signal amplifier and the like, and solves the problem of amplification distortion of RF power caused by adopting the RF linear power amplification technology. The wireless digital emergency video transmission system realizes one-way audio and video information transmission of the individual work bench, the vehicle-mounted station and the control center, two-way service information transmission of the individual work bench, the vehicle-mounted station and the control center, and two-way audio and video transmission of the vehicle-mounted station and the control center in emergency, and has more flexible processing of emergency communication.
Description
Technical field
The utility model relates to the wireless video transmission technique field.
Background technology
The mode that the on-the-spot situation of individual soldier's workbench is transmitted or directly transmitted by Vehicle mounted station of " wireless digital meet an urgent need Video transmission system " needs " in real time " sends control centre to, it is crowded to make that the emergent video transmission technologies of broadband wireless numeral is faced with the Radio Transmission Technology bandwidth, technical barriers such as signal emission distortion.
OFDM (Orthogonal Frequency Division Multiplexing) is that orthogonal frequency division multiplexi is the high speed transmission technology under a kind of broadband wireless context, and it has solved the problem of the high-speed mobile of broadband wireless transmission.The main thought of OFDM technology is divided into many orthogonal sub-channels with given channel exactly in frequency domain, on each subchannel, respectively each subcarrier modulated, and each subcarrier parallel transmission.Serial code when modulating simultaneously, treatedly be transformed into mutually orthogonal parallel sign indicating number, although total like this channel is a non-flat forms, having frequency selective fading, be relatively flat to each subchannel still, so this has just eliminated or can reduce greatly the interference of intersymbol.Because the carrier wave of each subchannel is mutually orthogonal in the ofdm system, so also mutually orthogonal their frequency spectrum of modulation code is can part overlapped, so not only reduced the phase mutual interference between subcarrier, the while has been improved the availability of frequency spectrum again.
Adopt OFDM that following shortcoming is arranged:
1) relatively more responsive to frequency deviation and phase noise.The method that the OFDM technology is distinguished each subchannel is to utilize orthogonality strict between each subcarrier.Frequency deviation and phase noise can make the orthogonal property between each subcarrier worsen, and only 1% frequency deviation will make signal to noise ratio decline 30dB.
2) power peak is big with the average ratio, causes the power efficiency of radio frequency amplifier lower.Ofdm signal is independently to be formed through the sub-carrier signal addition of ovennodulation by a plurality of, and such composite signal just might produce bigger peak power, also will bring bigger peak-to-average power ratio, is called for short PAR peak to average ratio.High PAR peak to average ratio can increase the requirement to radio frequency amplifier, causes the power efficiency of radio frequency signal amplifiers to reduce.
COFDM (coded orthogonal frequency division multiplexing), it is Coded Orthogonal Frequency Division Multiplexing (COFDM), be OFDM and the combining of chnnel coding, based on the thought that makes information in frequency domain and time domain expansion, the decline that each element number signal is subjected to when making transmission by coding can think that statistics is independent, thereby eliminates the influence of selectivity decline and frequency displacement.
In the emergent video transmission technologies of broadband wireless numeral, the nonlinear distortion of radio-frequency power amplifier can make it produce new frequency component, as producing second harmonic and double-tone beat frequency for second-order distortion, can produce triple-frequency harmonics and multitone beat frequency for third order distortion.These new frequency components will cause direct interference to the signal of emission as dropping in the passband, if drop on the outer signal that will disturb other channels of passband.
Summary of the invention
In view of this, the utility model proposes the problem that the emergent Video transmission system of a kind of wireless digital has solved emergent radio Video transmission system mobility and transmission bandwidth anxiety, the frequency deviation and the phase noise that adopt the OFDM technology to bring have been overcome, problems such as the power efficiency reduction of radio frequency signal amplifiers have overcome the defective of RF power amplification distortion.
The purpose of this utility model is achieved in that the emergent Video transmission system of wireless digital comprises individual soldier's workbench, Vehicle mounted station and control centre; Described individual soldier's workbench connects Vehicle mounted station and control centre by wireless network; Described Vehicle mounted station connects control centre by wireless network; Be equipped with the COFDM modulator in described individual soldier's workbench, Vehicle mounted station and the control centre.
Further, individual soldier's workbench size is 210 * 128 * 68mm
3
Further, described individual soldier's workbench comprises that audio-video collection module, audio/video information communication processing module, duties information communication processing module, duties voice receive earphone, utility module and power module are amplified in the communication information transmitting-receiving; The output of audio-video collection module is electrically connected with the input of audio/video information communication processing module, and the output of audio/video information communication processing module is electrically connected with the input that utility module is amplified in the communication information transmitting-receiving; The input that the duties voice receive earphone is electrically connected with the output of duties information communication processing module, and the input of duties information communication processing module is electrically connected with the output that utility module is amplified in the communication information transmitting-receiving; The power output end of power module is electrically connected with the power input of audio/video information communication processing module, duties information communication processing module, communication information transmitting-receiving amplification utility module respectively;
Further, Vehicle mounted station comprises that individual soldier's workbench audio/video information receiver module, individual soldier's workbench audio frequency and video forwarding module, duties information sends module, control centre's audio frequency and video receiver module and power module; Wherein, the output of individual soldier's workbench audio/video information receiver module is electrically connected with the input of individual soldier's platform audio frequency and video forwarding module, and the power output end of power module is electrically connected with the power input that individual soldier's workbench audio/video information receiver module, individual soldier's workbench audio frequency and video forwarding module, duties information are sent module and command centre's audio frequency and video receiver module respectively;
Further, described control centre comprises audio/video information sending module, Vehicle mounted station audio/video information receiver module, individual soldier's platform audio/video information receiver module, duties information sending module and power module; Wherein, the power output end of power module is electrically connected with the power input of audio/video information sending module, Vehicle mounted station audio/video information receiver module, individual soldier's workbench audio/video information receiver module, duties information sending module respectively;
Further, the COFDM modulator is arranged at respectively in the audio/video information sending module of individual soldier's workbench audio frequency and video forwarding module of audio/video information communication processing module, Vehicle mounted station of individual soldier's workbench and control centre;
Further, the communication information of described individual soldier's workbench transmitting-receiving is amplified utility module and is sent module with individual soldier's workbench audio/video information receiver module of Vehicle mounted station with duties information and be connected by wireless network; The communication information transmitting-receiving amplification utility module of described individual soldier's workbench sends module with the duties information of control centre and is connected by wireless network; Individual soldier's workbench audio frequency and video forwarding module of described Vehicle mounted station is connected by wireless network with the audio/video information sending module with the Vehicle mounted station audio/video information receiver module of control centre with control centre audio frequency and video receiver module.
The utility model beneficial effect is: the MPEG video of employing " compression and decompress(ion) " technology, orthogonal coding multicarrier COFDM " modulation and demodulation " technology have been saved the wireless transmission bandwidth, the frequency deviation and the phase noise that adopt the OFDM technology to bring have been overcome, problems such as the power efficiency reduction of radio frequency signal amplifiers; Adopt " amplifications of RF linear power " technology, with the amplitude of input rf signal envelope and phase place as a reference,, and then produce suitable correction, overcome the problem of RF power amplification distortion with the output signal comparison.The utility model has been realized under the case of emergency, unidirectional audio/video information transmission when individual soldier's workbench and Vehicle mounted station, control centre, the two-way duties message transmission of individual soldier's workbench and Vehicle mounted station, control centre, and the two-way audio frequency and video transmission of Vehicle mounted station and control centre, more flexible on emergency communication is handled.
Other advantage of the present utility model, target, to set forth in the following description to a certain extent with feature, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, the present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the emergent Video transmission system of the related wireless digital of the utility model;
Fig. 2 is the emergent Video transmission system individual soldier table device of the related wireless digital of the utility model;
Fig. 3 is the emergent Video transmission system Vehicle mounted station device of the related wireless digital of the utility model;
Fig. 4 is the emergent Video transmission system control centre of the related wireless digital of a utility model device.
Embodiment
Below will be described in detail preferred embodiment of the present utility model.
The wireless digital Video transmission system of meeting an urgent need comprises: individual soldier's workbench, Vehicle mounted station and control centre; Individual soldier's workbench connects Vehicle mounted station and control centre by wireless network; Vehicle mounted station connects control centre by wireless network, is provided with the COFDM modulator in the audio/video information sending module of described individual soldier's workbench, Vehicle mounted station and control centre;
Individual soldier's workbench comprises: audio-video collection module, audio/video information communication processing module, duties information communication processing module, duties voice receive earphone, utility module and power module are amplified in the communication information transmitting-receiving.
Vehicle mounted station comprises: individual soldier's workbench audio/video information receiver module, individual soldier's workbench audio frequency and video forwarding module, duties information are sent module, control centre's audio frequency and video receiver module and power module.
Control centre comprises: audio/video information sending module, Vehicle mounted station audio/video information receiver module, individual soldier's platform audio/video information receiver module, duties information sending module and power module.
The emergent Video transmission system of this wireless digital has been realized under the case of emergency, the unidirectional audio/video information transmission of individual soldier's workbench and Vehicle mounted station, control centre, the two-way duties message transmission of individual soldier's workbench and Vehicle mounted station, control centre, and the two-way audio frequency and video transmission of Vehicle mounted station and control centre.
The operating frequency of various transmission is as follows:
Wireless signal-path band width is 2.5MHz during transmission.
The operation principle of individual soldier's workbench:
1) need be when Vehicle mounted station or control centre's transmission audio/video information, audio-video collection module collection site audio/video information, the audio/video information of gathering imports audio/video information communication processing module into, audio/video information communication processing module is conveyed into communication information transmitting-receiving amplification utility module by the information that the MPEG2 mode is compressed, COFDM will modulate after will handling, the communication information transmitting-receiving is amplified utility module the signal that is conveyed into is amplified, filters the processing of making an uproar, and launches at last.
When 2) need receiving duties information from Vehicle mounted station or control centre, duties information is amplified utility module via the communication information transmitting-receiving and is received, and is sent to the demodulation of duties information communication processing module, receives earphone by the duties voice at last and exports.
The Vehicle mounted station operation principle:
When 1) needing to transmit individual soldier's workbench audio/video information, individual soldier's workbench audio/video information receiver module receives from individual soldier's workbench information, information is carried out demodulation, distributed and to enter individual soldier's workbench audio frequency and video forwarding module, compress by the MPEG2 mode, COFDM modulates once more, signal amplifies, and send to control centre processing such as filtering and noise reduction back.
When 2) need receiving audio/video information from control centre, control centre's audio frequency and video receiver module receives audio/video information from control centre by the COFDM wireless network.
3) need be when individual soldier's workbench send duties information, duties information is sent module and is sent duties information by wireless network to individual soldier's workbench.
Command centre's operation principle:
When 1) needing to receive Vehicle mounted station forwarding audio/video information, Vehicle mounted station audio/video information receiver module receives the forwarding audio/video information from Vehicle mounted station, at last audio/video information is being gone out by display screen and loud speaker by methods such as filtering, signal amplification, demodulation.
2) need be when Vehicle mounted station send audio/video information, the audio/video information sending module compresses by the MPEG2 mode, COFDM modulation, signal amplifies filter processing such as make an uproar audio/video information is sent.
When 3) needing directly reception from the audio/video information of individual soldier's workbench, individual soldier's platform audio/video information receiver module receives the audio/video information from individual soldier's workbench, and the process signal amplifies, filter is made an uproar, demodulation is exported audio/video information at last by display screen and loud speaker.
4) need be when individual soldier's workbench send duties information, the duties information sending module is sent duties information by wireless network to individual soldier's workbench.
In the audio-video signal transmission, native system has adopted MPEG2 or MPEG4 mode to compress audio/video information, the COFDM technology is carried out modulation to audio frequency and video, and RF linear power amplifying technique overcomes the transmitting antenna of signal magnification distortion and " high-power ", " high-gain ", " low third order intermodulation ".
The audio/video information sending module of the communication information transmitting-receiving amplification utility module of individual soldier's workbench, individual soldier's workbench audio frequency and video forwarding module of Vehicle mounted station and control centre is provided with the RF power amplifier and handles emission audio-video signal scale-up problem, at RF linear power amplifying element, adopt following technology:
1) selects high-power FET for use, as 395MHz audio frequency and video RF power amplifier, 12 volts of following power outputs are reached more than 4 watts as " arsenic potassium field effect transistor " PD55015;
2) keeping the input direct voltage of 395MHz audio frequency and video RF power amplifier is 12 volts, and third order intermodulation is reached more than the 35dB;
3) the best is accomplished in the I/O impedance matching of 395MHz audio frequency and video RF power amplifier;
The communication information transmitting-receiving of individual soldier's workbench is amplified utility module, individual soldier's workbench audio frequency and video forwarding module of Vehicle mounted station and the audio/video information sending module of control centre and is provided with transmitting antenna, when selecting the transmission antennas transmit audio/video information for use, control centre adopts high-gain omni-directional radio frequency antenna, the signal power of launching can be adjustable continuously between 4W～100mW, and receiving sensitivity is-105dBm; MHz rank high-gain omni-directional radio frequency antenna gain reaches more than the 12dB.The signal power that the Vehicle mounted station radio-frequency antenna is launched can be adjustable continuously between 12W～300mW, and receiving sensitivity is-105dBm.Individual soldier's workbench can be realized continuously adjustable between 1W-4W by the radiofrequency signal power that duplexer sends.The signal power that zone center is launched to the Vehicle mounted station radio-frequency antenna also can be adjustable continuously between 12W～300mW, and the zone center receiving sensitivity also is-105dBm.
Can realize the network coverage of individual soldier's workbench 3Km and Vehicle mounted station 10Km in the emergent Video transmission system of this wireless digital.Emergent radio digital video transmission under speed-adaptive 〉=150Km/h.
Individual soldier's workbench of the emergent Video transmission system of this wireless digital, length * wide * thick=210 * 128 * 68mm3, weight≤3Kg adopts " no fan " natural heat dissipation technology and closes the rainproof water-bound of envelope; Vehicle mounted station and control centre adopt the 3U standard PC case, the environment that adaptive temperature-35 ℃～+ 40 ℃ and high height above sea level are 2000 meters～4500 meters.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (7)
1. the emergent Video transmission system of wireless digital is characterized in that: comprise individual soldier's workbench, Vehicle mounted station and control centre; Described individual soldier's workbench connects Vehicle mounted station and control centre by wireless network; Described Vehicle mounted station connects control centre by wireless network; Be equipped with the COFDM modulator in described individual soldier's workbench, Vehicle mounted station and the control centre.
2. the wireless digital as claimed in claim 1 Video transmission system of meeting an urgent need, it is characterized in that: individual soldier's workbench size is 210 * 128 * 68mm
3
3. the wireless digital as claimed in claim 1 Video transmission system of meeting an urgent need is characterized in that: described individual soldier's workbench comprises that audio-video collection module, audio/video information communication processing module, duties information communication processing module, duties voice receive earphone, utility module and power module are amplified in the communication information transmitting-receiving; The output of audio-video collection module is electrically connected with the input of audio/video information communication processing module, and the output of audio/video information communication processing module is electrically connected with the input that utility module is amplified in the communication information transmitting-receiving; The input that the duties voice receive earphone is electrically connected with the output of duties information communication processing module, and the input of duties information communication processing module is electrically connected with the output that utility module is amplified in the communication information transmitting-receiving; The power output end of power module is electrically connected with the power input of audio/video information communication processing module, duties information communication processing module, communication information transmitting-receiving amplification utility module respectively.
4. the wireless digital as claimed in claim 3 Video transmission system of meeting an urgent need is characterized in that: Vehicle mounted station comprises that individual soldier's workbench audio/video information receiver module, individual soldier's workbench audio frequency and video forwarding module, duties information sends module, control centre's audio frequency and video receiver module and power module; Wherein, the output of individual soldier's workbench audio/video information receiver module is electrically connected with the input of individual soldier's platform audio frequency and video forwarding module, and the power output end of power module is electrically connected with the power input that individual soldier's workbench audio/video information receiver module, individual soldier's workbench audio frequency and video forwarding module, duties information are sent module and command centre's audio frequency and video receiver module respectively.
5. as the emergent Video transmission system of wireless digital as described in the claim 4, it is characterized in that: described control centre comprises audio/video information sending module, Vehicle mounted station audio/video information receiver module, individual soldier's platform audio/video information receiver module, duties information sending module and power module; Wherein, the power output end of power module is electrically connected with the power input of audio/video information sending module, Vehicle mounted station audio/video information receiver module, individual soldier's workbench audio/video information receiver module, duties information sending module respectively.
6. as the emergent Video transmission system of wireless digital as described in the claim 5, it is characterized in that: the COFDM modulator is arranged at respectively in the audio/video information sending module of individual soldier's workbench audio frequency and video forwarding module of audio/video information communication processing module, Vehicle mounted station of individual soldier's workbench and control centre.
7. as the emergent Video transmission system of claim 5 to 6 kind of each described wireless digital, it is characterized in that: the communication information transmitting-receiving amplification utility module of described individual soldier's workbench sends module with individual soldier's workbench audio/video information receiver module of Vehicle mounted station with duties information and is connected by wireless network; The communication information transmitting-receiving amplification utility module of described individual soldier's workbench sends module with the duties information of control centre and is connected by wireless network; Individual soldier's workbench audio frequency and video forwarding module of described Vehicle mounted station is connected by wireless network with the audio/video information sending module with the Vehicle mounted station audio/video information receiver module of control centre with control centre audio frequency and video receiver module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202943194U CN201639711U (en) | 2009-12-31 | 2009-12-31 | Wireless digital emergency video transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202943194U CN201639711U (en) | 2009-12-31 | 2009-12-31 | Wireless digital emergency video transmission system |
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| CN201639711U true CN201639711U (en) | 2010-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202943194U Expired - Fee Related CN201639711U (en) | 2009-12-31 | 2009-12-31 | Wireless digital emergency video transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785604A (en) * | 2012-07-25 | 2012-11-21 | 上海思快电子科技有限公司 | 3G video/audio emergency integrated command system |
| CN104009789A (en) * | 2014-06-11 | 2014-08-27 | 公安部上海消防研究所 | Broadband wireless communication device for fire-fighting robot |
-
2009
- 2009-12-31 CN CN2009202943194U patent/CN201639711U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785604A (en) * | 2012-07-25 | 2012-11-21 | 上海思快电子科技有限公司 | 3G video/audio emergency integrated command system |
| CN104009789A (en) * | 2014-06-11 | 2014-08-27 | 公安部上海消防研究所 | Broadband wireless communication device for fire-fighting robot |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20141231 |
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| EXPY | Termination of patent right or utility model |