摘要
<正>A LM-3B launched the Bei Dou 3 GEO-2 satellite into space at 19:55 Beijing time on March 9, 2020, from the Xichang Satellite Launch Center. The satellite entered its predetermined orbit later, marking the success of the launch mission.As the 54 th satellite in the Bei Dou navigation satellite system and also the 29 th Bei Dou 3 satellite, the Bei Dou 3