Video calls, also known as video phones, are divided into two ways: taking IP lines and taking ordinary telephone lines. A video call usually refers to a communication method in which a person's voice and images (a bust of a user, a photo, an item, etc.) are transmitted in real time between terminal devices based on the Internet or the mobile Internet (3G/4G Internet). Video calls require two networked terminal devices to realize real-time bidirectional transmission of audio and video through integrated software or third-party software. With the rapid increase of network bandwidth and the development and popularization of hardware devices, the video call market has also entered the fast lane of development.
The current society is changing rapidly, and all kinds of emergencies exist every moment. The current emergency command is built to solve the remote and modern command and dispatch requirements for dealing with emergencies, individual events, group events, social events, etc., and has the following characteristics:
1. Flexible, easy to deploy and recyclable.
2. Audio and video can be recorded in real time, and each unit location is displayed in real time.
3. It can be used around the clock, with good environmental suitability, stable communication and reliable security.
The common scenario of the emergency system is as follows:
As shown in the above figure, the previous emergency systems are common in mobile command seats, dispatch phones, factory broadcasts, cluster intercom, office phones, smart handheld terminals, 2G mobile phones, etc. All of the above are often limited to the region. Although there are multiple levels of dispatching and commanding capabilities, the venues are relatively estimated, and it is impossible to truly implement portable, mobile, and intelligent emergency handling.
The portable mobile communication terminal developed by Chenhan Electronics came into being. This equipment originated from the satellite communication products independently developed for military enterprises. The product is designed and developed according to the military grade. It is waterproof, dustproof and anti-drop. It is based on Android 4.4 system development and mainly provides satellite phone, image acquisition and transmission, two-way video call, file transfer, remote network access, data transmission and other functions. . Products can be applied to various satellite ground stations according to actual needs, such as command center main station, vehicle station, portable mobile communication station. As an application for portable mobile communication stations, it requires an external portable satellite antenna and a portable generator.
In order to realize this complete set of portable terminals, Chenhan Electronics designed the entire system block diagram:
The overall system block diagram is as follows:
Its main hardware configuration is equipped with Freescale I.MX6Q CPU, 1G, 1GB, DDR3 memory, 1GB, built-in EMMC4GB, 12V power supply, 7-inch LCD display, the entire portable device with on-off control and restart function, battery capacity up to 10.8V/3Ah, continuous working time is not less than 2.5 hours; at the same time, the whole machine has various types of buttons, audio and video interfaces, I2C interfaces, various sensors, etc., which can realize all kinds of required functions.
The portable terminal simultaneously combines the embedded application system software, and realizes the audio and video intercom at a low bit rate, the high-definition data delivery, the Beidou positioning message transmission and the like by connecting the two-way transceiver station, and can be optionally configured as a GPS/Beidou double The mold system can be optionally configured as a GPS/Beidou dual mode system. In the design, the special requirements of the broadcast receiving equipment are also fully considered. The satellite application handheld terminal has excellent service quality and good network interconnection. The modular design makes the network performance stable, easy to expand, and efficient and economical. reliable.
The software operation flow chart is as follows:
The main features of the software are as follows: powerful video capture and processing functions, support for video recording, video encoding compression, UDP access operation, video compression rate and format, video communication playback and storage between two terminals, video Resolution: 800 & TImes; 480, video frame rate: 25/30fps, video encoding compression: can support 64/128/256/384/512kbps, encoding format: H.264/mp4/WMV; powerful video playback function: support The video playback function of local or UDP access can complete WMV hard decoding video playback function, and the maximum supported receiving information transmission rate is 30Mbit/s; file transmission function: support file and picture access function through UDP, and can complete between two terminals. File, picture transmission and storage function; narrow-band video call function: bit rate can be as low as 10kbps, you can choose 10kbps, 32kbps, 64kbps, 100kbps, etc. to 512kbps; HD map viewing/navigation function: you can deliver HD map and navigate, view current location information.
In summary, the portable terminal provides users with a multi-tasking satellite communication platform. Through the combination of the hardware platform and the software platform, the user can conveniently establish satellite communication with the command center or other terminals regardless of the location. Link, transmission of images, voice, data and other services. Products can be widely used in agriculture, forestry, animal husbandry and fisheries, medical and health, metallurgy and minerals, water conservancy and hydropower, transportation, machinery and electromechanical and other civil, industrial, military and other harsh environmental requirements of the industry.
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