Four major satellite navigation systems in the world?

1, Global Positioning System (GPS), characterized by omnipotence (land, sea, aviation and aerospace), global, all-weather, continuous and real-time navigation, positioning and timing. It can quickly provide accurate instantaneous three-dimensional coordinates, velocity vectors, accurate timing and other services for various static or high-speed users.

2. GLONASS is characterized by unstable operation, short satellite life, slow development of user equipment, few manufacturers, bulky equipment and FDMA, so the frequency synthesizer in the user receiver is complex and compatible with the receiver, and it is necessary to solve the time and coordinate system problems of the two systems.

3. Galileo satellite navigation system (GNSS), features: fully open new generation positioning system with the highest accuracy in the future. The ground system of Galileo system is mainly composed of two Galileo control centers (GCC) located in Europe and 20 Galileo sensor stations (GSS) distributed around the world. In addition, there are 5 S-band uplink stations and 65,438+00 C-band uplink stations distributed around the world for data exchange between the control center and satellites.

4. Compass, Beidou satellite navigation system, function: 1. Users lose radio concealment while positioning, which is quite unfavorable in the military; 2. Because the equipment must include a transmitter, it is at a disadvantage in terms of volume, weight, price and power consumption. 3. System capacity: 540,000 households per hour. 4. Key components such as atomic clocks still need to be imported.

References:

China Satellite Navigation and Positioning Application Management Center-Brief Introduction of Global Positioning System

China Satellite Navigation and Positioning Application Management Center -GLONASS

China Satellite Navigation and Positioning Application Management Center-Galileo Satellite Navigation System

China Satellite Navigation and Positioning Application Management Center-Beidou Satellite Navigation System