VFD-8000DB Mobile Video System for Billboard Soldier
VFD-8000DB wireless single-soldier mobile video transmission system is a brand-new wireless high-definition digital image transmission equipment developed by our company from the application of emergency real-time video transmission. It fully meets the needs of emergency wireless image transmission and provides some convenient functions to meet the needs of users. Requirements of site environment. The device has compact structure, small size and good expansibility.
VFD8000 COFDM mobile multimedia transmission system is the most critical system equipment, and is the cornerstone to solve the problem of China Mobile Communication. The main features of the system equipment are as follows:
(1) It has strong diffraction ability, uses UHF frequency band, has stronger diffraction ability, and can work in non-line-of-sight environment. To adapt to various complex environmental requirements.
(2) The coverage of a single central station can reach 3 km in a typical urban environment. The communication distance between personal portable terminal and mobile vehicle can reach 1-3 km.
(3) It has strong anti-jamming ability, excellent anti-frequency selective fading or narrowband interference and interference between signal waveforms. It has strong anti-fading ability through the joint coding of various subcarriers. In single carrier systems (e.g. digital microwave, spread spectrum microwave, etc.), a single fading or interference can lead to the failure of the whole communication link, but in multi-carrier COFDM systems, only a small part of the subcarriers will be interfered, and these subchannels can also use error-correcting codes to correct errors to ensure low transmission error rate. 。
(4) It has strong anti-fading ability. It adopts COFDM's diversity receiving technology, which has stronger multi-path diversity effect, especially suitable for the fast moving working environment of cities. It also adopts many advanced diversity technologies, such as space diversity, time diversity and so on, to greatly enhance the anti-fading ability of the system. The adoption of the above advanced technology ensures that the product has superior reception sensitivity in complex working environment.
(5) Excellent mobile performance: through the overall system design and implementation of many advanced technologies, the designed mobile speed can reach 500 km/h; at present, the road survey speed in the actual environment is 180 km/h, especially adapted to the working requirements in high-speed mobile environment such as airborne, vehicular and shipborne, to meet the work needs of different users.
(6) Battery power supply is provided by backpack products, and the power supply time is longer than 3 hours.
(7) Perfect overall solution: Provide an integrated solution from personal shoulder-mounted to vehicle-mounted remote station to central station end-to-end, to achieve high-speed, real-time and synchronous transmission of multimedia information such as video, audio and data over a wide range of mobile environments;
(8) Various and flexible interfaces: provide debugging, business and other data interfaces and local status monitoring, flexible and convenient to use. It can be easily connected with image codec, and can also provide broadband data service interface. It can also provide video and voice signal interface according to user's requirements, and connect multiple video sources, which is more convenient for users to use.
(9) Strong confidentiality, stability and reliability: AES encryption technology is used to realize all-digital signal processing; at the same time, super-large-capacity FPGA design is used to provide system integration; all of these ensure the confidentiality, stability and reliability of the system.
(10) 12V power supply is used to meet the requirements of on-board level.
(11) The electromagnetic compatibility, seismic resistance, temperature and humidity of the equipment are fully considered.
(12) The installation of the equipment is simple and convenient, with short cycle and little difficulty. Vehicle-mounted equipment uses sucker antenna, which can be directly adsorbed on the roof without additional auxiliary accessories. The equipment is small and can be installed in standard cabinets.
The front end of the backpack launcher is transmitted to the command vehicle
1. Introduction of Transmitter Performance
1.1 The image transmitting device is backpack.
1.2 The front-end of the system adopts COFDM modulation technology and MPEG-2 image compression technology, which can ensure high performance of transmission and high quality of image.
1.3 All the front-ends have the functions of non-line-of-sight and transmission in motion.
1.4 Front-end devices use a universal video interface, which can be connected to either an ordinary analog camera or a digital camera.
It can connect cameras (including helmet-mounted cameras) with military image acquisition devices such as night vision, infrared and thermal imagery, and professional cameras.
1.5 The full-enclosed radiator cabinet is adopted for the backpack equipment, which eliminates the heat in the transmitter cabinet and brings higher safety to the system. The chassis has the functions of dust-proof, water-proof and earthquake-proof.
1.6 Backpack type is mainly used for real-time signal transmission of ground personnel or equipped with ordinary vehicles. It can also navigate on the water surface.
Real-time transmission is carried out on ships with a transmission distance of not less than 5 kilometers under the condition of through-view, not less than 1 kilometer under the condition of non-through-view, and a carrier's velocity of not less than 80 kilometers per hour.
2. Introduction of Receiver Performance
2.1 It adopts omnidirectional antenna and has the function of diversity reception (dual antennas input at the same time).
2.2 The omni-directional antenna can be used to receive, and the directional antenna can also be used to receive, improve the gain and expand the transmission range.
2.3 It can output image and sound signals at the same time.
2.4 has one VIDEO interface and two AUDIO interfaces.
Technical Indicators:
Working band: 300-900MHz, 2MHZ-8MHZ bandwidth adjustable
Channel bandwidth: 2/4/6/8MHZ
Image compression format: MPEG2;
Output power: 2-5W
Transmission Distance: Visual Distance 5-10 km; Non-Visual Distance 1-3 km (Visual Environment)
Video input: PAL;
Audio channel: two channels;
Transmission delay: 650 milliseconds
Moving speed: up to 180KM/h;
Working temperature: 0-65 C
Dampness and heat: not less than 95%;
Line standard: 625;
Resolution: 720 horizontal line 576 vertical line;
Use environment: waterproof, fog proof, shock proof, dust proof;
Power supply: AC 220V or DC10 ~ 16V;
Camera equipment interface: compound VIDEO BNC interface, sound 2 channels: (mono, stereo) left/right;
Power Charging Equipment Interface: DC12V Charging
Weight: 3KG
Technical parameters of VFD-8000DB system
Transmitter:
Modulation: COFDM, 2K, QPSK
Working band: 300-800MHz (customizable bandwidth 20MHZ, such as 320-340MHZ)
Radio Frequency Bandwidth: 8, 4, 2MHz Adjustable
RF power: 33.0 dBm (1-2 W)
Transmission rate: 6Mbps
Forward Error Correction: 1/2
Protection interval: 1/32
Video Input: 1 PAL/NTSC Analog Video
Audio Input: Analog Stereo Left and Right Channels
Video compression: MPEG-24:2:0
Radio Frequency Interface: N Bus Head
Video interface: BNC header
Audio interface: BNC header
External battery: 12-14V/8800mA
Charging power supply: DC16.8V/800mA
Working hours: 3 hours
Power consumption: 40W
Working environment: - 10 - 70 C
Size: 260*145*55mm
Whole machine weight: 1500g
Receiver:
Acceptance threshold: less than - 96 dBm
Radio Frequency Interface: N Bus Head
Power consumption: 10W
Whole machine weight: 1.5Kg
Receiving band: 320-340MHz, or 300-800MHZ can be selected by remote control.
Demodulation mode: COFDM, 2K, QPSK
Forward Error Correction: 1/2
Protection interval: 1/32
Video output: 1 PAL/NTSC analog video
Image quality: 720*576
Horizontal lines: 625 or 525
Audio Output: Analog Stereo Left and Right Channels
Radio Frequency Interface: N Bus Head
Video Interface: Lotus Head
Audio Interface: Lotus Head
Power supply: AC220V
Working environment: - 10 - 70 C
Shape size: 425X200X44.4mm (1U chassis)
