On the 19th, Japan used the H2A rocket to send the navigation satellite "Trail" No. 3 to the scheduled orbit, which is a step toward the initial construction of an independent satellite navigation system in Japan. At 14:29 on the 19th (13:29 GMT), the H2A rocket was launched from the Tanegashima Space Center in Kagoshima Prefecture in southern Japan. About half an hour after the launch of the rocket, the “Trail 3†satellite will be put on the scheduled orbit. "Trail" No. 1 was launched in 2010. On June 1st this year, Japan launched the "Trail" No. 2. Satellite 3 was originally scheduled to be launched on the 12th of this month, but the launch plan was temporarily cancelled about 1 hour before launch due to fuel system problems. Japan plans to launch "Trail" No. 4 this year to initially construct a satellite navigation system with four satellites and strive to further expand it to seven satellites by 2023. Japan's "Guideway" series of satellites is called a quasi-zenith satellite system. This satellite system includes a number of geosynchronous orbiting satellites with the same orbital period. These satellites are distributed on multiple orbital planes. Whenever there is a satellite that can complete Covers Japan as a whole. This system is also known as the Japanese version of GPS (Global Positioning System). Nowadays, Japan has completely relied on the US GPS system for satellite positioning. The Japanese government hopes to establish its own satellite positioning system that is compatible with US GPS and can improve positioning accuracy. In the future, an independent global satellite positioning system that does not rely on US GPS will be implemented.
