CN108322696A - A kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies - Google Patents
A kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies Download PDFInfo
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- CN108322696A CN108322696A CN201711348712.2A CN201711348712A CN108322696A CN 108322696 A CN108322696 A CN 108322696A CN 201711348712 A CN201711348712 A CN 201711348712A CN 108322696 A CN108322696 A CN 108322696A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
- H04L9/0631—Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The present invention provides a kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies, including audio and video A/D conversion modules, AES encryption module, MPEG2 coding modules, COFDM modulation modules and memory module, real-time AV vision signals are converted to digital signal by the audio and video A/D modules, it is encrypted, after compression processing by AES encryption module, MPEG2 coding modules, it is modulated into radiofrequency signal by COFDM modulation modules, and is sent out through antenna.The present invention uses multi-carrier modulation technology, and overcoming multi-path jamming reduces the bit error rate, has the characteristics that long transmission distance, diffracting power are strong, is particularly suitable for non line of sight in City Building blocking environment and high-speed mobile and transmits.
Description
Technical field
The present invention relates to wireless communication fields, and in particular to the unmanned plane based on 340MHz multi-carrier modulation technologies is without line chart
Biography system.
Background technology
Currently, technical system used by wireless image transmission can be roughly divided into：GPRS/CDMA/3G (mobile communication),
LMDS (spread spectrum microwave), WLAN (WLAN), DBS (satellite), COFDM (orthogonal frequency division multiplexing) etc., various technologies have
Intrinsic advantage and defect.GPRS/CDMA/3G (mobile communication) has many advantages, such as that networking is at low cost, resource utilization is high, but transmits
Rate is generally at 100Kbps grades, it is difficult to transmit the image of high quality；LMDS (spread spectrum microwave) can provide the bandwidth of 1GHz or more,
Bidirectional high speed transmission of video can be achieved under intervisibility environment, but cannot be used in stopping environment and in mobile；WLAN (wireless offices
Domain net) networking flexibility, dilatation is convenient, uses OFDM multi-carrier modulations in physical layer, but number of carrier wave is few, frequency range is high, is hindering
Using effect is undesirable under gear and mobile environment；DBS (satellite) bandwidth, capacity is big, and communication distance is remote, area coverage it is big and
Do not limited by geographical conditions, but due to the shortage of satellite channel cause to rent it is expensive.
Above-mentioned Radio Transmission Technology is not suitable for unmanned plane use, and unmanned plane, which schemes to pass in real time, at present mostly uses microwave biography
It is defeated, tri- kinds of frequency ranges of 1.2GHz, 2.4GHz or 5.8GHz are usually selected, but still that there are transmission ranges is not remote enough, is easily built by ground
It builds object interference, lack the shortcomings of necessary encipherment protection, it is difficult to meet the industries long distance such as public security, People's Armed Police, fire-fighting, electric power, broadcasting and TV
From high-resolution real-time Transmission audio and video, especially wanted on the way or under blocking environment with high-speed into what row information was transmitted mobile
It asks.
Invention content
The purpose of the invention is to provide a kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies
System, is nobody of third generation communication technology COFDM (multi-carrier modulation technology), MPEG2 video coding techniques and AES encryption technology
Machine is wireless audio/video transmitting device, the device in high-speed mobile and can transmit real-time high-resolution sound under the circumstance of occlusion of city
Video has audio and video relay transmission ability, and live aerial monitoring is provided for emergency command and accident disposition.The system can
It transmits in " in high-speed motion ", " non-to regard under gating condition " remote, high quality graphic to realize, is provided simultaneously with and is carried for ground installation
For the ability of aerial relay communication.
To achieve the above object, the invention discloses a kind of unmanned planes based on 340MHz multi-carrier modulation technologies without line chart
Biography system, it is characterised in that：Mould is modulated including audio and video A/D conversion modules, AES encryption module, MPEG2 coding modules, COFDM
Block and memory module, real-time AV vision signals are converted to digital signal by the audio and video A/D modules, by AES encryption mould
Block, MPEG2 coding modules are encrypted, after compression processing, are modulated into radiofrequency signal by COFDM modulation modules, and through antenna
It sends out.
Audio-video acquisition equipment outside the above-mentioned audio and video A/D conversion modules connection of unmanned plane wireless image transmission system, leads to
Cross the live audio/video information of audio-video acquisition equipment input.
Unmanned plane wireless image transmission system further includes a receiving terminal with D/A conversion modules and AES deciphering modules, this connects
Receiving end will be reduced into loss-free high-resolution sound and video image after the data deciphering after the encoding compression processing received.
Unmanned plane wireless image transmission system further includes a remote control module, which has hopping, passes through electricity around detecting
Magnetic environment determines that available channel, selected channel are generated according to transmitter ID by respective algorithms at random, and every frame data of transmitting are all
Including globally unique ID, improves the anti-interference ability in complex electromagnetic environment.
The audio/video decoding module is H.264 audio decoder module.
The remote control module takes 2.4GHz frequencies to receive and send messages, and avoids the co-channel interference between figure communication number.
The each subcarrier of COFDM technologies of use can select the High Speed Modulations such as QPSK, 16QAM, 64QAM, after synthesis
Channel speed is generally more than 4Mbps, can transmit 4 in MPEG2:2:0、4:2:The high quality encoding and decoding such as 2, receiving terminal image point
Resolution can reach 576 × 720 or 480 × 720 or 1920 × 1080, can fully meet the requirements such as post analysis, storage, editor.
Using 128 AES digital-scrambling techniques, the encryption of WiMAX multicarrier, signal scrambling technique, realize at complete digital signal
Reason, ensure that the confidentiality, stability and reliability of whole system, air transmission information is made to obtain safety guarantee.
Using the optimum balance between the availability of frequency spectrum and the bit error rate as principle, power control and Adaptive Modulation phase are used
Co-ordination mode selects different modulation systems according to the quality of channel condition, can be with enhanced modulation when channel is good
Mode (such as 64QAM), or reduce transmission power at low modulation mode (such as QPSK).
The beneficial effects of the invention are as follows：The present invention is by 340MHz multi-carrier modulation technologies and multi-rotor unmanned aerial vehicle flying platform
In conjunction on the one hand avoiding traditional 1.2GHz, 2.4GHz, 5.8GHz microwave simulation drawing and pass easily by electromagnetic environmental impact, diffraction energy
On the other hand the drawback that force difference, transmission range are short, confidentiality is insufficient maximumlly avoids complexity using itself flying height advantage
Blocking of the landform to video transfer signal, gives full play to the performance of COFMD image transmission systems.Meanwhile the present invention is also equipped with aerial lead to
Believe relay capabilities, the audio-video signal of ground Image transmission equipment can be forwarded, sent out using equipment of itself after Video Quality Metric, expand by
The transmission of video distance of the influence of topography or the insufficient graphic transmission equipment of transmittability is video directing system in complex condition
Steady and audible audio and video are provided.
Description of the drawings
Fig. 1 is that the present invention is based on the structural frames of the unmanned plane wireless image transmission system transmitting terminal of 340MHz multi-carrier modulation technologies
Figure.
Fig. 2 is that the present invention is based on the structural frames of the unmanned plane wireless image transmission system receiving terminal of 340MHz multi-carrier modulation technologies
Figure.
Specific implementation mode
The present invention is combined 340MHz multi-carrier modulation technologies with multi-rotor unmanned aerial vehicle flying platform, not only increases nobody
The ability of machine itself transmission of video, and it is also equipped with relay communication ability, the audio-video signal of ground Image transmission equipment can be forwarded, is passed through
It is sent out using equipment of itself after Video Quality Metric, expands and passed by the video of the influence of topography or the insufficient graphic transmission equipment of transmittability
Defeated distance provides steady and audible audio and video in complex condition for video directing system.
The present invention is further described for explanation and specific implementation mode below in conjunction with the accompanying drawings.
As shown in Figure 1, the unmanned plane wireless image transmission system transmitting terminal by：Video acquisition photographic device, from steady holder, depending on
Frequency memory module flies control navigation module, and GPS satellite locating module, OSD video laminating modules, 340MHzCOFDM figures, which pass, emits mould
Block, 5.8GHz microwave figure transmitting/receiving modules, Video Output Modules, video frequency switching module, aerial omnidirectional's circular polarization aerial,
2.4GHz or 900MHz data radio stations and remote control signal receiving module, power management module composition.The COFDM figures pass transmitting mould
Block is integrated with A/D conversion modules, AES encryption module, MPEG2 coding modules, radiating module.
Airborne high definition Flying Camera function is carried out at the same time the recording to ground progress HD video and real-time AV is exported to OSD
Video laminating module can control the vibrations of direction and suppression from fuselage of airborne high definition motion cameras from steady holder, protect
It is steady and audible to hold video.
OSD videos laminating module can read every state of flight and GPS positioning information from flight control system, and by this
A little data, which are led to after the video image that video camera transmits is overlapped, to be exported to video frequency switching module.
At the same time, airborne 5.8GHz microwave imageries receiving module can receive the letter of the video image from ground installation
Number, it is exported to video frequency switching module again by real-time AV.Airborne DVR video records module can also record simultaneously to be come from
The video information of 5.8GHz image transmission modules.
The effect of video frequency switching module is being passed to 340MHzCOFDM figure biography transmitting modules for selecting according to the actual needs property
The defeated vision signal from airborne high definition Flying Camera head or 5.8GHz microwave imagery receiving modules.
The wherein described 340MHzCOFDM figures pass transmitting module and carry out MPEG2/MPEG4 codings to the video information received
Processing is allowed to generate the TS audio/video flows of high-resolution, and TS streams carry out RS codings by scrambler and are output to external interleaver, through pulleying
Be input to interleaver after product coded treatment, then carry out mapping later and form frame data, at this time by pilot tone and TPS signal with it is described
Frame data mixed, be inserted into, then carry out at D/A conversions and orthogonal modulation and radio frequency amplification by IFFT to protection interval
It is sent by antenna after reason.This stage can also carry out AES128 bit encryption processing to data.
As shown in Fig. 2, terrestrial wireless image transmission system receiving terminal by：340MHz figures pass reception antenna, and tablet tracks antenna, from
Motion tracking holder, COFDM figure transmitting/receiving modules, video-frequency monitor, video storage and management of video module, ground control station,
2.4GHz or 900MHz data radio stations and remote signal transmitting module composition.The COFDM figures transmitting/receiving module includes DA conversions
Module, deciphering module, decoder module, Video Output Modules.
The video reception module is then corresponding with video transmission module in Fig. 1, and video reception module first passes through antenna
Receive vision signal.Antenna can switch between normal vertical poliarizing antenna and tablet tracking antenna, from motion tracking cloud
Platform can read OSD video laminating modules and be added to the location information of unmanned plane in video, to the finger of adjust automatically plate aerial
To face unmanned plane, to keep the stabilization of wireless signal.
The vision signal received is amplified by tuner and amplifier, and the laggard inclined school of line frequency is converted using A/D
Positive input is to FFT unit, and the signal after FFT unit carries out phasing at this time, while carrying out TPS codings again, by frame arteries and veins
Punching and configuration information output, while the video information is synchronized, the information after synchronizing is re-send to by A/D converter
Tuner.
Video information after phase correction is quantified after then carrying out channel estimation, carry out solving later it is interior interweave,
CITERBI is encoded, RS is synchronized to the outer intertexture of solution, is then passed through and is carried out descrambling code discrepancy TS streams, these TS streams after RS coded treatments
The then input video information after MPEG2/MPEG4 is decoded.Video information can further be linked into video directing system
Each terminal.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, should all regard, to belong to the present invention's
Protection domain.
Claims (4)
1. a kind of unmanned plane wireless image transmission system based on 340M multi-carrier modulation technologies, it is characterised in that：Including audio and video A/D
Conversion module, AES encryption module, MPEG2 coding modules, COFDM modulation modules and memory module, real-time AV vision signals pass through
The audio and video A/D modules are converted to digital signal, are encrypted, at compression by AES encryption module, MPEG2 coding modules
After reason, radiofrequency signal is modulated by COFDM modulation modules, and send out through antenna.
2. unmanned plane wireless image transmission system according to claim 1, which is characterized in that the audio and video A/D conversion modules
Audio-video acquisition equipment outside connection inputs live audio/video information by audio-video acquisition equipment.
3. unmanned plane wireless image transmission system according to claim 1, which is characterized in that further including one has D/A conversions
The receiving terminal of module and AES deciphering modules, the receiving terminal will be reduced into after the data deciphering after the encoding compression processing received
Loss-free high-resolution sound and video image.
4. unmanned plane wireless image transmission system according to claim 1, which is characterized in that further include a remote control module, the mould
Block has hopping, determines that available channel, selected channel pass through corresponding according to transmitter ID by detecting periphery electromagnetic environment
Algorithm generates at random, and every frame data of transmitting all include globally unique ID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711348712.2A CN108322696A (en) | 2017-12-15 | 2017-12-15 | A kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711348712.2A CN108322696A (en) | 2017-12-15 | 2017-12-15 | A kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies |
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| Publication Number | Publication Date |
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| CN108322696A true CN108322696A (en) | 2018-07-24 |
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| CN201711348712.2A Withdrawn CN108322696A (en) | 2017-12-15 | 2017-12-15 | A kind of unmanned plane wireless image transmission system based on 340MHz multi-carrier modulation technologies |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110913173A (en) * | 2019-10-30 | 2020-03-24 | 湖北大学 | Unmanned aerial vehicle image transmission system |
| CN111083311A (en) * | 2019-12-31 | 2020-04-28 | 航天图景（北京）科技有限公司 | Synchronization system and method for airborne multi-channel video and POS data of unmanned aerial vehicle |
| CN111757047A (en) * | 2019-03-29 | 2020-10-09 | 无锡人人行拍网络科技有限公司 | Transit machine high definition digital image transmission system transmitting terminal |
| CN112738566A (en) * | 2020-12-29 | 2021-04-30 | 农业农村部南京农业机械化研究所 | WMCM wireless multi-carrier high-definition mobile image transmission system |
| CN113784092A (en) * | 2021-08-12 | 2021-12-10 | 北京共创晶桔科技服务有限公司 | Unmanned aerial vehicle multi-base-station graph transmission system |
| CN113872667A (en) * | 2021-09-24 | 2021-12-31 | 中国人民警察大学 | Unmanned aerial vehicle video image real-time transmission system |
-
2017
- 2017-12-15 CN CN201711348712.2A patent/CN108322696A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111757047A (en) * | 2019-03-29 | 2020-10-09 | 无锡人人行拍网络科技有限公司 | Transit machine high definition digital image transmission system transmitting terminal |
| CN110913173A (en) * | 2019-10-30 | 2020-03-24 | 湖北大学 | Unmanned aerial vehicle image transmission system |
| CN110913173B (en) * | 2019-10-30 | 2023-03-31 | 湖北大学 | Unmanned aerial vehicle image transmission system |
| CN111083311A (en) * | 2019-12-31 | 2020-04-28 | 航天图景（北京）科技有限公司 | Synchronization system and method for airborne multi-channel video and POS data of unmanned aerial vehicle |
| CN112738566A (en) * | 2020-12-29 | 2021-04-30 | 农业农村部南京农业机械化研究所 | WMCM wireless multi-carrier high-definition mobile image transmission system |
| CN113784092A (en) * | 2021-08-12 | 2021-12-10 | 北京共创晶桔科技服务有限公司 | Unmanned aerial vehicle multi-base-station graph transmission system |
| CN113872667A (en) * | 2021-09-24 | 2021-12-31 | 中国人民警察大学 | Unmanned aerial vehicle video image real-time transmission system |
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Application publication date: 20180724 |
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