With the development of technology, mobile voice and data communications systems have been popular, more and more users will shift the focus to move to the video above. In some special industries such as: military, public security, armed police fire and other industries, growing demand for mobile information systems, the system will not only need to be resolved on-site images, mobile voice transmission, but also require real-time two-way transmission of data, database information inquiries.
Based mobile applications through a wireless link can only be achieved, but now widely known as spread spectrum microwave Although high-bandwidth, but limited to high-frequency points, can be through visual conditions; as to ensure high-speed, making device receiver sensitivity becomes very low, relatively close distance; now most of the wireless LAN equipment is designed to solve the short-range, fixed point, the indoor network interconnection, so in support of long-distance mobile applications has inherent deficiencies. In the present, many mobile wireless applications where the center can not provide a wireless remote visual environment, and mobile video is very difficult. And general narrow-band products, although with low frequency, the diffraction ability, the characteristics of transmission distance, but a very low rate image transmission is difficult to meet the requirements.
iNET advanced frequency hopping spread spectrum radio technology, equipment, very strong anti-interference ability. Using special encryption, strong safety performance. Work on 340MHz radio frequency band, low frequency, with a strong diffraction and penetration capabilities, radio transmit power can be to 5W, to ensure that the radio transmission distance, and because the station uses digital signal processing technology and Forward Error Correction FEC technology, it has a high signal reception sensitivity and can guarantee a reliable signal transmission, wireless environment is to make it more difficult to adapt to the case of the application. Radio air transmission rate of up to 512/256Kbps, to meet the general image of the requirements over the same time providing a device Ethernet port, two serial ports, with video servers and other devices that can provide images, voice and data solutions.
INET radio transmission rate for the situation is not very high, and the need to transmit voice, data, we chose the H.264 video server that uses the world's most advanced field of video transmission technology, has a very high image compression , and the technology for easy wireless packet loss, bit error correction and other features provide the appropriate tools. In terms of relative and wired and wireless transmission capacity is limited, so we provide dual-stream video server, video transmission, to ensure transmission of images over wireless air link will not exceed the bandwidth of the case, but also to ensure that the ship itself high-resolution image is consistent images.
As iNET radio with the above characteristics, we can all along the coast on the center tower erection 8.5dBi omni-directional antenna, the same ships used 8.5dBi omni-directional antenna, in the case of a certain block, to ensure that the radius of within a few kilometers to tens of kilometers of real-time transmission of live images back to command center. When the ships in the process of moving from one base station coverage area to move to another base station coverage area, the radio automatically switches to the base station and communicate with the base station. Moreover, iNET300 radio support IAPP protocol, which makes each base station can link their own remote devices to share information with other base stations, so you can ensure that the remote radio base station in the switch between fast roaming. To achieve the mobility of mobile video systems and video transmission in real time, on-site command center to improve the efficiency of the command. At the same time, on-site staff can also set real-time wireless access to private network headquarters internal network, relevant data files, to achieve on-site office, greatly improve work efficiency.
System structure:
This article is from Beijing Industrial network grid company, thanks.
