What does a satellite communications service company do? Thanks 40

Hello, this topic is a bit big, lacks a definite limit, and is difficult. I can only give you some references from experience :

In the past, domestic state-owned enterprises may have such a unit called "satellite communication service company", which is responsible for satellite communication support within the group (and sometimes externally). For example, (hypothetically), at the beginning of the establishment of China Unicom, to provide mobile network coverage for the whole country, however, they do not have a ground network to connect their base stations and base station controllers and network control centers, so they have to build a satellite network to connect their base stations and base station controllers, etc., and satellite communications are only used to support its main business - mobile networks, which are logistics service support, and may set up a company under the group to be responsible for the operation of satellite networks, which may be named "satellite communication service companies". This type of company is responsible for the construction of the satellite communication network required by the group and is responsible for its operation (watch, maintenance, etc.).

It is very similar to the current "VSAT operators", such as Nanjing China Network, Beijing Tianyu, etc. The difference is that such companies are affiliated with and for the group, whereas today's VSAT operators are socially oriented and may operate independently.

Hope it helps. If you provide more information, it will be relatively accurate.

At sea, there is no signal in remote areas, and satellite communication is needed at this time, and the general charge will be more expensive to get in touch with the outside world by setting up base stations.

China Satellite Communications Group's treatment includes three aspects: salary, benefits and career development.

1. Salary: According to the position and working ability, China Satellite Communications Group provides reasonable remuneration for employees, including basic salary, performance bonus, job allowance, subsidy, housing subsidy, etc.

2. Welfare: China Satellite Communications Group provides comprehensive benefits for employees, including housing provident fund, Qiwei medical insurance, supplementary medical insurance, unemployment insurance, work-related injury insurance, endowment insurance, maternity insurance, holiday benefits, paid annual leave, birth control leave, etc.

3. Career Orange Exhibition:

China Satellite Communications Group provides employees with comprehensive career development opportunities, including regular training, technical promotion, and title promotion. In addition, the company also provides training and development opportunities for employees to improve their skills and qualities and achieve career development.

Satellite communications and terrestrial microwave communications.

Similarities: both are microwave communications, and they all have the characteristics of microwave communication - they need to be visual, microwave transmission, refraction, and interference.

Differences: 1. Weijian Wangxing communication is approximately ideal free-space microwave transmission, while ground microwave communication is greatly affected by terrain and landform interference;

2. Put the ground microwave relay station in the sky (satellite), it becomes satellite communication, so the transmission distance is not limited by the spherical occlusion of the earth's surface (50 km ground microwave relay). Geostationary orbit satellites can cover about 1 3 area of the Earth's surface (ground-based microwave stations cannot do it);

3. The communication distance has nothing to do with the cost, because within the coverage area of the satellite, any site is connected by satellite. Terrestrial microwaves need to be relayed, and the distance between the two microwave relay stations is generally not more than 50 kilometers;

4. The satellite communication delay is relatively large, the synchronous orbit is about 36,000 kilometers from the ground (equator), and the radio wave delay of single hop (station A-satellite-B station) is seconds, and the double hop is seconds (speed of light = 300,000 kilometers and seconds).

5. The received signal of satellite communication is relatively small, while the ground microwave communication is much stronger. Because of the limited branches of the satellite payload and power supply, as well as the long-distance attenuation from the satellite to the ground (the attenuation of the distance from the satellite to the ground is about 200dB), the satellite signals received by the earth station need to be amplified by low-noise amplifiers first;

6. Satellite communication can be spontaneously self-receiving, and the multiple access mode is flexible: FDMA, TDMA, CDMA, SDMA, and can be freely combined.

The main characteristics of satellite communication are summarized: wide coverage, long transmission distance, cost independent of communication distance, delay time, spontaneous self-collection, flexible multiple access, etc.

I hope it can help you, this information can be found in the now relatively new "Satellite Communication System Engineering".

1. The satellite communication system is actually a kind of microwave communication, which uses the satellite as a relay station to communicate between multiple ground mountain stations, and the main purpose of satellite communication is to achieve "no difference in the gap" coverage of the ground, because the satellite works in the orbit of hundreds, thousands, or even tens of thousands of kilometers, so the coverage is much greater than the general mobile communication system.

2. However, satellite communication requires ground equipment to have a large transmission power, so it is not easy to popularize use.

1. Satellite** is a satellite communication system based on the satellite communication system to transmit information, that is, a satellite relay intercom. Satellite relay intercom is the product of modern mobile communication, and its main function is to fill the area that can not be covered by the existing slag communication (wired communication, wireless communication) terminal, and provide more sound services for people's work. In modern communication, satellite communication cannot be replaced by other high-bucket communication methods, and all the communication functions provided by existing commonly used communication have been applied in satellite communication.

2. After nearly two years of hard work, China Telecom has released numbers for the commercial market for the first time, and China has entered the "mobile phone era" of satellite mobile communication, filling the gap of domestic independent mobile communication systems and breaking the status quo of relying on foreign satellite mobile communication services. Tiantong satellite covers a wide range of Qiliangmo, has strong communication capabilities, and has no blind spots in service.