2003 年 51 巻 593 号 p. 307-313
Quasi-zenith satellite system attracts the attention recently, at least one satellite of which is in high elevation angle. Large capacity communication system and GPS augmentation system using quasi-zenith satellite system are proposed. GPS augmentation satellites in high elevation can improve integrity capability and navigation accuracy of GPS. In the first half of paper, I show the constellation design of quasi-zenith satellite system to optimize for Japan. In the last half, I show the GPS augmentation effect by designed quasi-zenith satellite system.