What is the first self-developed Everest elevation survey in China?

In 2020, the survey of Mount Everest reached the summit of Mount Everest on May 27th. Domestic instruments are used to receive signals from Beidou satellite navigation system and carry out GNSS measurement, domestic snow depth radar detector is used to detect the snow depth at the summit, and domestic gravimeter is used to carry out gravity measurement.

This is also the first time that human beings have carried out gravity measurement at the summit of Mount Everest, which will be beneficial to the optimization of geoid, improve the elevation accuracy of Mount Everest and obtain valuable scientific data. At the same time, when the beacon was set at the summit, the survey team simultaneously carried out the summit intersection survey and GNSS joint survey at six intersection points at the foot of Mount Everest to obtain the elevation data of Mount Everest.

Although the data has been obtained, it will not be released immediately. It is also necessary to calibrate, measure and calculate the data in multiple directions, methods and times to make the data as accurate as possible.

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Advantages of Beidou navigation system

1, active positioning and passive positioning

Active positioning means that the receiver sends position information to the satellite during the positioning process, while the passive positioning receiver does not need to send information to the satellite. Under active positioning technology, only two satellites are needed for positioning, while under normal passive positioning, at least four satellites are needed for positioning. The advantages of active technology are reflected in some harsh environments and poor satellite search.

2. Short message communication service

This technology is unique to China. The so-called short message refers to the two-way information transmission between the user terminal and the satellite through satellite signals, which is more suitable for communication in an emergency. During the Wenchuan earthquake in 2008, the only communication mode in the earthquake zone was Beidou generation.