What's the use of satellite communication? Where is the daily use of satellite communication?

Satellite communication refers to the technology of using artificial earth satellite as relay station to relay radio signals, so as to realize communication between multiple ground stations. It is the inheritance and development of terrestrial microwave communication. Satellite communication system usually consists of two parts, namely, satellite terminal and ground terminal. Satellites are in the air and are mainly used to amplify the signals sent by ground stations and then forward them to other ground stations. The ground station is mainly used to control and track satellites and realize the access of the ground communication system to the satellite communication system.

The characteristics of satellite communication are: wide coverage, wide working frequency bandwidth, good communication quality, not limited by geographical conditions, and the cost has nothing to do with communication distance. Mainly used in international communication, domestic communication, military communication, mobile communication, radio and television and other fields. The main disadvantage of satellite communication is that there is a certain delay in communication. For example, when you make a satellite phone call, you can't hear the other party's reply immediately. The main reason is the long transmission distance of satellite communication and the delay of radio wave transmission in the air.

Satellite mobile communication is complementary to the ground communication system because of its advantages of wide coverage and being unaffected by geographical conditions, and is widely used in areas where the ground communication system is difficult to cover or the construction cost is too high.

At present, there are more than 300,000 high-power fishing boats and 6,543.8+0,000 small and medium-power fishing boats in China's marine fisheries. The existing communication means (mobile phone, ultrashort wave, short wave and Beidou short message) have various disadvantages, which can not meet the needs of fishing boats and fishery command, especially the high demand for calls. Satellite mobile communication system can make up for this business vacancy.

According to statistics, there are 40,000 reservoirs in China without communication means. According to the calculation of 2300 counties, the county flood control headquarters is equipped with two handheld terminals of satellite mobile communication system1~, and each basin of the seven river basin management systems is equipped with 20 handheld terminals. * * * About 70,000 satellite mobile communication voice terminals and hundreds of thousands of hydrological automatic monitoring data terminals are needed.

In many areas of western China, the geographical conditions and natural environment are very bad, and the ground communication is powerless. Using satellite to solve the problem of village-to-village communication in particularly remote areas has the characteristics of less investment and simple and flexible installation. It is suitable for remote areas where fixed communication and mobile communication are difficult to cover, and has good social benefits.

Satellite communication operated by China Telecom has played an important role in Yushu earthquake relief, forming a three-dimensional security pattern in which satellite network, mobile communication network, fixed network and Internet complement and support each other. Some experts in China have appealed that it is particularly important and urgent to build a satellite emergency communication system because of China's vast territory, complex geology and frequent disasters and emergencies.

Taking oil exploration as an example, the exploration areas where the oil teams are located are mostly deserts and Gobi Desert, which are remote and cannot be taken care of by public telecommunication networks. In the past, short-wave radio stations were mainly used by oil field teams and could not meet the development needs of oil exploration and development. Satellite communication is not affected by geographical conditions and covers a wide range, which can meet the communication needs of oil exploration.

At the end of 2006, the earthquake in Taiwan Province Province damaged submarine communication cables, causing large-scale communication failures, which had a great impact. This incident reflects the importance and urgency of "satellite communication as a backup means".

Conclusion: As a long-distance wireless communication technology, satellite mobile communication is complementary to the ground communication system with its advantages of wide coverage and being unaffected by geographical conditions, and is widely used in areas where the ground communication system is difficult to cover or the construction cost is too high.

The purpose of satellite communication:

Due to the limitation of base station layout and geographical factors, traditional mobile phones have problems such as no call signal and no data signal, but satellite mobile communication has broken through this bottleneck. In areas where there is no cell phone signal coverage, satellite communication will be used, or sometimes satellite phones will be used as a backup to prevent the danger of walking to places where there is no cell phone signal.

At present, more seafarers, field explorers, residents living in deserts, grasslands and Gobi are using satellite phones. And some experienced travelers and some business people may also be equipped with satellite phones. The main purpose is to keep in touch with the outside world where we usually know that mobile phone signals can't be covered, and come in handy when we are in danger or need help.

Classification of satellites:

According to different service areas, it is divided into international communication satellites, regional communication satellites and domestic communication satellites;

According to the purpose, it is not divided into military communication satellites, civil communication satellites and commercial communication satellites;

According to the different types of communication services, it is divided into fixed communication satellites, mobile communication satellites, television broadcasting satellites, maritime communication satellites, tracking and data relay satellites;

Do the cell phone signals we use every day need to be transmitted by satellite?

At present, in most cases, mobile phone signals do not need satellite forwarding. Most base stations of mobile communication use optical fiber to access the core network. Usually, satellite phones have antennas, but our commonly used smart phones can't see the antennas. The reason is that the satellite phone needs more transmitting power, so the antenna is bigger than the smart phone, with higher power consumption and less functions.

Of course, it doesn't mean that mobile phones don't use satellite communication signals at all. Special circumstances are possible. We have a broad understanding of satellite phones, that is, from the Wenchuan earthquake in 2008, all communications were interrupted and could not be restored in a short time, so we could only communicate by satellite phones, and then Malaysia Airlines 370 disappeared. At that time, the maritime satellite company calculated an approximate range according to the angle of the airborne satellite antenna. Unfortunately, Malaysia Airlines 370 did not buy satellite service at that time.

Satellite communication can transmit high-quality sound and image information, with high communication coverage, simple equipment, light weight and large information transmission capacity, which is not affected by the weather. It is an important communication means in contemporary emergency communication vehicles.

In recent years, with the rapid development of commercial space flight, satellite launch has become easier and easier with the maturity of technology and industry, and the scope of satellite application has become larger and larger with the needs of people's lives. Satellite navigation, satellite communication, satellite observation ... Besides these satellite applications, satellites can also be used to do these things.

1: Satellites can be used for maritime rights protection.

On August 16, China successfully launched Gaofen-3 satellite from Taiyuan Satellite Launch Center.

On August 20 16, Gaofen-3 satellite was launched by Long March 4 C carrier rocket.

As China's first synthetic aperture radar imaging satellite with the resolution of 1 m, the satellite can provide global monitoring service around the clock and will be used in disaster early warning, weather forecast, water resources evaluation, marine rights protection and other fields.

This high-resolution satellite not only has a large imaging width, but also can survey specific areas in detail. It is also China's first long-life low-orbit remote sensing satellite with a life span of 8 years.

2. Satellite measurement of employment growth.

Satellite data usage methods and machine learning methods can provide a good insight into how big data and new analytical methods will change the way we measure poverty in the future.

Researchers use machine learning methods (that is, using algorithms to get inspiration from data) and satellite images to predict the distribution of poor people.

Combining the time series data of satellite images with computers that learn to identify traces of buildings, roads, vehicles and economic activities can bring more accurate, lower-cost and more convenient methods to measure consumption expenditure, assets and wealth.

Satellites can be used to measure earthquakes.

Zhang Heng-1 is the first electromagnetic monitoring test satellite independently developed and built in China, which will be launched and put into use around August 2065438+2007. By then, China will be able to monitor the whole territory and the global three-dimensional geophysical field for the first time, and it is also the only country with multi-load and high-precision earthquake monitoring test satellites in orbit.

4. Satellite monitoring the temporal and spatial changes of smog.

Fengyun-4 was developed by the Eighth Institute of China Aerospace Science and Technology Corporation. Its main function is to observe the atmosphere, clouds and space environment with high time resolution, high spatial (three-dimensional) resolution and hyperspectral resolution, and provide services for high-precision weather analysis and forecast, short-term climate forecast, environment and disaster monitoring and space environment monitoring and early warning.

5. Satellite monitoring of carbon dioxide concentration

20 16 12 22. China's first scientific experimental satellite for monitoring the global atmospheric carbon dioxide content was successfully launched in Jiuquan. This satellite is equipped with two scientific payloads: an integrated hyperspectral carbon dioxide detector and a multispectral cloud and aerosol detector, and will observe the subtle changes of carbon dioxide concentration 1% in key areas and even the global atmosphere.

6. The application of satellites in the field of ecological environment and safety emergency.

According to the Xinjiang Uygur Autonomous Region Economic and Information Committee, the high-scoring satellite data of Xinjiang Satellite Application Center are widely used in ecological environment and safety emergency, with a demonstration area of 3.77 million square kilometers and direct economic benefits of 332 million yuan.

7. Application of satellites in agriculture.

This study began on 20 16. Researchers discovered the impact of climate change on agricultural economy, and used agronomy model based on remote sensing to predict the change of agricultural productivity.

To talk about the use of satellite communication, first talk about the advantages and disadvantages of satellite communication:

Advantages:

1. Long communication distance: within the coverage area of satellite beam, the longest communication distance is13000km;

2. Not limited by any complicated geographical conditions between two communication points;

3. The two communication points are not affected by any natural disasters and man-made events;

4. The communication quality is high and the system reliability is high, which is often used as a support system during the emergency repair of submarine cables;

5. The farther the communication distance, the lower the relative cost;

6. The transmission and data interaction of TV programs, radio programs and news can be realized in a large area;

7. It has great mobility and can realize satellite mobile communication and emergency communication;

8. The signal configuration is flexible, which can provide hundreds, thousands or even tens of thousands of voice channels and medium and high-speed data channels between two points.

9. It is easy to realize multi-address transmission;

10, which can easily realize various business functions.