This forces in battle goes, armed police and public security departments in during the armed rebellion, chase escaped prisoner, forest fire fighting, the flood-fighting disaster relief, important items and important meeting him the protection of work all need to grasp of the scene, then the scene and the communication between the command center is especially important. So how to timely and command department to make connections, exchanging the various data and image, that the commander in multimedia information over the command center can be in first time understanding of the scene quickly made decisions without delay time? Mobile satellite communication system (hereinafter referred to as "move zhongtong") is mobile carrier (including cars, trains, ships, aircraft, etc) by satellite in motion, fast ZhongShi ?
1. The system working principle "move zhongtong" the most outstanding characteristic (are the most prominent difficulties) is servo system in the vehicle must be produced under the condition of rapid turbulence that Lord on communication satellite antenna beam, which requires the servo system posture change to have high isolation degree, which must be isolated off change drastically collector attitude to the influence of the antenna pointing.
IMVS450M "move zhongtong"
VSAT system is the United States TracStar company recently launched is different from the low profile narrowband "phased array antenna" medium outline broadband "move zhongtong" VSAT system. The antenna compared with the traditional parabolic "move zhongtong" antenna although poor in electrical performance aspects, but in the physical characteristics with small, small volume and weight profile characteristics of light and has a good mobile carrier adaptability, ? antenna
3.1. But with private network interworking
Private network through the ground line and satellite master station (fixed station) are linked together, the master station through satellite and "dynamic zhongtong" connected, and in the process of moving in, "move zhongtong" the car can and private network two-way voice, data and fax and other business communication.
3.2. But with PSTN (public telephone network) the inter-communication
Public telephone network through the ground line connected with master station master station through satellite and "dynamic zhongtong" connected to this "move zhongtong" car in the process of moving in with public telephone network any one of a two-way voice, data and fax and other business communication.
3.3. TV transmission function
In "move zhongtong" car and satellite communications are supplied with the main TV system, can achieve in the mobile process ?
3.4. Wireless led by function
In some the scene of the fire, or need to put all sorts of relevant images to command center records, analysis, processing. In "move zhongtong" car cannot directly at the scene, can through the microwave image transmission system directly image transmission to the "move zhongtong" the car, again through the car's satellite communication system via satellite images and satellite communication transmitted to headquarters, Lord it is quicker and timely.
3.5. TV receiving function
Can receive on the moon's Ku frequency satellite TV program. If the alignment of the moon Ku frequency band satellite television, this system can be in does not affect other business, and at the same time receive satellite TV program.
3.6. Networking function
Can pass any a geosynchronous satellite or empty
4. System technical characteristics
(1) through the satellite direct transmission. The system through any a geosynchronous satellite, realize the point-to-point, point-to-multipoint bidirectional of various multimedia information, including high-definition image, in time, quickly mastered the first-hand data.
(2) strong real-time property: the system in mobile can real-time acquisition of the site would quickly any information or data back on command center or receiving a command center of information, can immediately to the scene of the correct judgment, and has a strong real-time and timeliness.
(3) wide coverage area: the system with time, region and the distance of the limit, every satellite coverage of the area can be performed, reliable and effective communication with two-way, coverage area is very wide.
(4) mobility strong: the system not only in mobile carrier at rest, ensure the normal two-way contact, the most remarkable feature is moving in the field or events will send up the chase, implementation process of information and command (the) a two-way contact, easy to deal with emergencies, have very strong mobility.
(5) information capacity: can be voice, data, fax, high-definition image and other multimedia information, change other communication can preach voice and fax phenomenon.
(6) the secrecy strong: system can be equipped with group of privacy and confidentiality, etc terminal road multiple security measures, that need to be kept secret information to a safe and reliable transmission.
(7) physical characteristics have small, small volume and weight profile characteristics of light, has the good
5. Equipment composition
Outdoor parts: IMVS450M "move zhongtong" day system, ODU feed, LNA.
Indoor parts: servo control system, beacon receiver, satellite channel equipment, business terminals.
