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Why can't the lost plane be found? Academician of Engineering Academy: GPS and Beidou are not standa

Malaysia Airlines has been out of touch for such a long time. Everyone is very concerned about the latest news of the lost aircraft and why it is so difficult to find the lost aircraft? Are the search and rescue personnel not using high-tech technology or methods? Such as Beidou Positioning, GPS positioning and other methods can not search?

The academician of the Chinese Academy of Engineering explained that GPs can only communicate in one way, while Beidou can communicate in two directions, but it is not a standard configuration for civil aviation

According to the China Science Daily, on March 10, it was reported that China urgently mobilized nearly 10 satellites to provide technical support for ground search and rescue operations, while strengthening the status monitoring of Beidou navigation satellites to ensure reliable navigation and communication support for ground rescue operations at any time.

Liu Jingnan, academician of the Chinese Academy of engineering, introduced that the Beidou system itself has the function of search and rescue. However, in order to successfully implement the search and rescue, the search and rescue object must be equipped with a Beidou signal receiver.

"Since the Beidou signal receiver has not yet become a standard configuration for civil aircraft, there is no Beidou receiver installed on the lost aircraft. "So unfortunately, we can't use the Beidou system to locate the aircraft. '

At present, in this field, the standard configuration of civil aviation system is American GPS satellite navigation and positioning system. It is understood that GPs can only carry out one-way communication, and aircraft can only passively receive satellite signals. In case of an accident, they can only wait for GPS to search for themselves. Beidou has the function of two-way communication, and the signal receiver can also send messages to the satellite system to realize its search and rescue function.

"If a Beidou receiver is installed on the lost aircraft, or if passengers carry equipment with a Beidou receiver, we can find its trace and carry out search and rescue. "Liu Jingnan stressed.

Liu Jingnan further revealed that China has carried out a number of international negotiations to promote the Beidou satellite positioning system to make it a standard configuration in various industries. At the same time, the service scope of Beidou will gradually expand. It is estimated that by 2020, the number of Beidou satellite navigation system satellites will reach 35, covering nearly three-quarters of the global area.

Although the search and rescue function of Beidou can not be realized in this operation, it can still play an important role. The ships and aircraft involved in the search and rescue have been equipped with Beidou receivers, and the Beidou system can accurately locate their longitude and latitude. "Beidou system can determine the search area according to the accurate positioning of search and rescue vessels and aircraft. "Liu Jingnan said," the system will mainly do these auxiliary work this time. '

It is understood that Beidou also has certain advantages in precision. At present, 16 Beidou satellites are concentrated in the Asia Pacific region, of which 5 are concentrated in the equatorial plane. The more satellites are distributed in a region, the higher the signal strength, navigation accuracy and stability.

Liu Jingnan pointed out: "in the low latitude area where the search and rescue is carried out, the accuracy of Beidou is between a few meters and more than ten meters, which is very useful. "He hopes that through the comprehensive application of various technologies, traces of the lost aircraft can be found as soon as possible.