BEIJING, Apr. 5 (China Space News) — China Academy of Space Technology (CAST) recently finished the in-orbit test of the 18th, 19th and 20th BeiDou navigation satellites, marking the three new-generation satellites begin to function together,which lays a good foundation for the technology demonstration and engineering construction of the future networking constellation.

And it is also reported that three satellites completed 29 in-orbit tests, including the satellite platform, satellite payload and domestic devices and components, and piggyback tests.