What are the characteristics of satellites? What is the function of artificial satellite?

Satellites are widely used, some of which are equipped with photographic equipment, which can be used to take photos of the ground, investigate resources and monitor the climate and pollution of the earth. Some are equipped with astronomical observation equipment for astronomical observation; Some are equipped with communication relay equipment to relay communication signals such as broadcasting, television, data communication and telephone; Some are equipped with scientific research equipment, which can carry out scientific research and special production in weightless space. In a word, satellites have different uses because of the different purposes of development, production and users.

Satellites have a wide range of functions, some of which are equipped with photographic equipment, which can be used to take photos and scout the ground, investigate resources, monitor the climate and pollution of the earth, etc. Some are equipped with astronomical observation equipment for astronomical observation; Some are equipped with communication relay equipment to relay communication signals such as broadcasting, television, data communication and telephone; Some are equipped with scientific research equipment, which can carry out scientific research and special production in weightless space.

Satellite refers to a natural celestial body that runs around the planet and periodically in a closed orbit. Satellites can also be called satellites in general. Man-made satellites are devices built by human beings, which are launched into space by spacecraft such as rockets and space shuttles, and orbit around the earth or other planets like natural satellites.

Reconnaissance satellite Reconnaissance satellite is an artificial earth satellite used to collect and intercept military intelligence. The advantages of satellite reconnaissance are wide reconnaissance range and high speed, and it can monitor a certain area regularly or continuously without the restriction of national boundaries, which is of great significance to enhancing the military strength and comprehensive national strength of the country. Reconnaissance satellites are distinguished according to the tasks they perform and the reconnaissance means they adopt. Generally divided into photographic reconnaissance satellites, electronic reconnaissance satellites, marine surveillance satellites and early warning satellites.

Main Purpose Navigation The Global Positioning System "GPS", also known as "navigation", is a constellation composed of 24 satellites, which can accurately locate any place on the earth. Users can use a very small receiver to receive signals from four GPS satellites and calculate position data. The horizontal distance and height accuracy for military use is 5m, and the average for civilian use is15m.