What's the difference between Beidou-1 navigation system and Beidou-2 navigation system?

1, technical principle difference of navigation system: A satellite navigation system adopts the principle of Doppler velocimetry, that is, it uses the Doppler frequency shift of navigation signals to find out the range change rate for navigation and positioning. Another satellite navigation system adopts the principle of time ranging, that is, by measuring the propagation time of navigation signals to find out the distance and carry out navigation and positioning. Most satellite navigation systems use this method, including three generations of Beidou navigation satellites.

2. Difference of navigation coverage: According to the signal coverage of navigation satellites, satellite navigation systems can be divided into regional satellite navigation systems and global satellite navigation systems. China's Beidou-1 and Beidou-2 satellite navigation systems and Japanese and Indian satellite navigation systems belong to the former, while the US, Russian, European and China's Beidou-3 satellite navigation systems belong to the latter. ?

3. Navigation satellites have different orbits: Navigation satellites can also be divided into low-earth orbit, medium-earth orbit, inclined geosynchronous orbit and geostationary orbit according to their orbital heights. China's Beidou-1 is a geostationary navigation satellite, and Beidou-2 and Beidou-3 navigation constellations are composed of circular navigation satellites, inclined geosynchronous navigation satellites and geostationary navigation satellites.

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Beidou-1 system initially proposed a double-star positioning mode, which broke the monopoly of foreign technology and established the first regional active satellite positioning system based on the principle of double-star positioning. The short message service of this constellation is unique in the field of international navigation and has played a vital role in major national events such as the Wenchuan earthquake. As a characteristic of Beidou, short message service has been retained in the subsequent Beidou satellites, which has provided enlightenment for the development of navigation satellites in many countries.

Beidou-2 system broke through the key technologies of regional mixed navigation constellation construction and high-precision space-time reference construction, realized the localization of on-board atomic clock, and realized the regional satellite navigation system with mixed constellation for the first time in the world. After the system is completed, its technical indicators are equivalent to the international advanced level.

The Central Committee of the Communist Party of China, the State Council and the Central Military Commission spoke highly of the completion and putting into use of the Beidou regional satellite navigation system, saying that the completion and putting into use of the system is an important milestone in the informationization construction of the country and the army and an important contribution to China's economic and social development.

People's Network Past Life-Beidou Satellite Navigation System

Baidu Encyclopedia-Beidou Satellite Navigation System