A. Satellite Communications, Navigation, and Observation Communications and Navigation Systems Research

In the fields of satellite communications and positioning, where private-sector participation is rapidly expanding, this research focuses on the development of core technologies required for next-generation communication and navigation. This research consists of the following subthemes:

high-capacity data transmission systems to enable ultra-high-throughput satellite communications with capacities ranging from several tens to hundreds of Gbps or more;
long-distance communication systems to support the establishment of lunar communication infrastructure;
next-generation positioning technologies to enable more advanced positioning systems; and
radio-wave propagation control technologies to further improve communication quality.

Significance of the Research

Research on the core technologies for high-capacity satellite communications, together with technologies for radio-wave propagation control, will enable satellite communication systems to meet increasingly diverse user requirements while improving communication performance and reliability.
Technologies such as High-Power Optical Amplifiers, digital coherent communications, and high-sensitivity receivers are essential for the development of lunar communications infrastructure. Establishing these technological capabilities will enable Japan to fulfill its role in international cooperative space programs, including the Artemis initiative.
Furthermore, developing more accurate and robust positioning technologies, which are resistant to interference, will directly improve convenience in everyday life.

Example configuration of a Non-Terrestrial Network (NTN)