With the rapid development of mobile internet technology, mobile communication involves all aspects of life. At present, the ground mobile communication infrastructure has been able to provide good mobile communication services for major terrestrial areas, but at sea, in the air, in remote or extreme areas of the land, especially Satellite mobile communication systems (MSS) are still the only reliable option under special conditions such as emergency and disaster relief for major natural disasters, as well as military applications. From the first generation of analog signal technology communication to the second generation of digital transmission technology to the third generation of handheld terminals, it has experienced more than forty years of development, and has gradually been widely used in military and civilian fields, especially in the military field. The portable handheld terminal has higher requirements, and communicates with the satellite receiving station through the communication of the handset or the mobile terminal, thereby communicating with the mobile satellite, as shown in the figure:
As satellite mobile communication systems play an increasingly important role in modern communications, the state has invested heavily in the development of smart handheld terminals. However, the current situation is that most of the grassroots units are equipped with various types of low-rate satellite communication equipment, and most models support data services. However, in practice, the data communication service usage rate is very low. The main reason is that there is no dedicated data communication software and supporting mobile data terminals. In the past, the grassroots units opened up the use of data communication services, mainly using the super terminal communication software desktop notebook computer that comes with the operating system. It has a single function and poor interactivity. The content of the service message is confusing. The desktop or laptop computer is a communication terminal with portability and reliability, which cannot be adapted to the needs of the field environment.
As a portable data processing terminal, the following features are required:
Operating system with data storage and data manipulation
Secondary development
Can communicate with other devices
There are applications that can perform human-computer interaction.
Battery powered
Lightweight and easy to carry
Can adapt to a variety of complex environments (high and low temperature, high power consumption, etc.)
In response to the above situation, Jiangsu Chenhan Electronic Technology Co., Ltd. has defined and developed the high-performance satellite application handheld terminal with i.MX6Q Cortex A9 chip as information processor, which includes a 7-inch, relying on years of deep cultivation in the embedded industry. A color LCD touch screen with a resolution of 800*480, with two front and rear CMOS cameras, one microphone and one speaker and one Ethernet interface, and a lithium battery with power reading function. It is mainly used to process broadcast subscriber station data information. The information is transmitted through a high-speed network interface. The terminal power supply supports internal battery and subscriber station power supply. Through powerful hardware video codec technology and satellite video communication software, Perform point-to-point real-time audio and video communication. It can work stably at -40 ° C to 85 ° C. It has the characteristics of small size, low power consumption, high integration, easy operation and high reliability. It can meet the information processing applications of individual field operations and mobile carrier platforms.
In terms of structure, the handheld terminal has ARM CORTEX-A9 quad-core processor and 7-inch high-brightness industrial-grade LCD screen and resistive touch screen. It is developed according to military grade and has waterproof, dustproof and anti-drop functions, and is equipped with different capacity batteries. It can achieve more than 6~10 hours of endurance. Support 10/1000M adaptive Ethernet, RS232 serial port, USBOTG and HOST interface, and optional GPS / Beidou dual-mode system, the system block diagram is as follows:
In terms of human-computer interaction, the handheld terminal has a set of application software based on the most widely used and mature mobile operating system and Android operating system. The flow chart is shown on the right. The user can choose to perform serial port parameter setting or network port parameter setting to select different monitoring modes, and implement monitoring and information processing on the device. The monitoring module is mainly responsible for the network access and exit of the equipment, the general parameters of the equipment, the query and setting of the satellite parameters, the Beidou positioning information of the equipment, the real-time update display and setting of the state of the antenna controller, and the realization of the handheld terminal and the satellite information system. Query and control; the information processing module is mainly responsible for receiving, displaying and storing business information of the handheld terminal and the device, and supporting one-to-one and one-to-many group transmission, and can realize video, picture, short message of the broadcast network terminal, The function of sending and receiving voice and file, and also the information interaction between the handheld terminals, realizes the communication between the handheld terminal and the satellite information system.
In practical application scenarios, the satellite mobile communication system can provide users with mobile communication services such as voice, data, and short messages in the region and the world by using high- and low-orbit mobile communication satellites. The utility model has the advantages of large coverage, long working distance, flexible networking, basically no communication cost and distance, no limitation of existing equipment on the ground, and little influence by terrain objects. The mobile handheld terminal is an important part of the satellite mobile communication system, and it can be customized and developed according to a specified communication protocol for a specific application scenario. In the military field, he benefited from his small size, easy to carry, reduced equipment load, and ensured the efficient and convenient battlefield communication, ensuring that the troops can maintain contact anywhere, tactically, transmitting a large amount of voice and data traffic. The ability to facilitate the transfer of some key information, this ability may have a strategic impact; relying on strong stability, portability, the handheld terminal also has great potential in the civil field, in navigation positioning, navigation, In terms of search and rescue and meteorological monitoring, the efficiency of maritime operations has been effectively improved by means of mobile and convenient operation. In the event of natural disasters, the search and positioning under extreme natural conditions can satisfy the actual needs to the greatest extent and ensure the safety of people's lives and property.
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