The advantages of the Beidou satellite navigation system (Beidou 3 Global Positioning System) over GPS are threefold 

In terms of accuracy, BeiDou is the only constellation that uses a combination of three orbits: medium circular, geostationary and geosynchronous, so that the Asia-Pacific region can maintain at least 12 satellites almost permanently. Dramatically improving the positioning accuracy in the region.

In terms of reliability, Beidou uses tri-frequency signals, which is conducive to improving the resistance to ionospheric interference, and improves the reliability of positioning. gps is still using dual-frequency signals, GPS satellites are all replaced by tri-frequency satellites still need several years.

In terms of military application, according to the analysis of military experts, such as the Dongfeng-21 medium- and long-range cruise missiles, the error will be more than one kilometer, to ensure that the destruction of the target, it is necessary to use more missiles, the implementation of saturation strikes, but the cost is high. With the addition of the Beidou navigation system, the accuracy can be increased to 10 to 30 meters, and the lethality of a satellite-guided missile can then be comparable to that of 20 conventional missiles.