成層圏プラットフォームを用いた擬似 GPS 衛星による航法測位サービスについて

摘要: Recently, some countries have begun conducting feasibility studies and R&D projects on High Altitude Platforms Systems (HAPS). Japan has been investigating the use of an airship system that will function as a stratospheric platform (altitude about 20km) for applications such environmental monitoring, communications broadcasting. It is planned network would cover all Japan. Remote sensing from be very effective because it floats above same ground area, permitting continuous monitoring surface. However, precise positioning one most important technical challenges project. If pseudolites were mounted airships, their GPS-like signals stable augmentations improve accuracy, availability, integrity GPS-based systems. The accuracy pseudolite positions limiting factor service since PL 'ephemeris error' more serious than GPS due to lower height airship. In this paper, conceptual design airship-based augmentation first introduced. Then schemes estimating position are described. A preliminary experiment involving 'inverted-GPS' shows excellent stability in static mode, while kinematic test suggests need mitigate multipath effects receivers.