Long distance site diversity characteristics measurement results via JCSAT by using one Earth station measuring method

Satellite communication technologies are now highly developed and high quality, distance-independent-services have expanded over very wide areas. In particular, low cost very small aperture terminal (VSAT) services for data, voice and video communications have expanded widely with new services and new applications. The Hokkaido Integrated Telecommunications (HIT) network has been examined with satellite communication systems and newly-built optical fiber or low cost SHF band terrestrial radio networks. By using the HIT network, economical and highly functional services, including expansion of the network to rural areas can be realized. As for the system design of the HIT network, it must be constructed as economically as possible. Furthermore, to apply the 14/12 GHz band VSAT system, it must first overcome rain attenuation discontinuity of the satellite links, which is most difficult problem to the 14/12 GHz band. To resolve those problems, several propagation experiments were carried out; (1) determination of the rain margin measurement for optimum design of the HIT network, and (2) site diversity characteristics measurement. The propagation characteristics for 14/12 GHz band are measured via the JCSAT-1 transponder by using a newly developed measuring method.