Author:
Naoki Shinohara
Affiliation:
Kyoto University, Japan
Keyword(s):
Electromagnetic fields, Radio-frequency fields, Measurement, Visualization, EMC, Absorber.
Abstract:
Solar Power Satellite/Station (SPS) is one of important energy system in future, which is supported by radio wave technologies. The electric power which is generated in the SPS is transmitted to the Earth by microwave or laser. We need a high efficiency and light weight for microwave power transmission (MPT) system in order to reduce total cost of the SPS. There were some MPT phased array, for example, a phased array in the MILAX experiment in 1992 in Japan, a magnetron phased array in MPT airship experiment in 2009 in Japan, and a phased array in the Hawaii experiment in 2008 in US and Japan. However, there were not enough for the future SPS. Recently in Japan, there are two trials to develop a MPT phased array. One is a new phased array for collaborative inter-universities researches, which has been developed in Kyoto University in FY2010. The other is the SPS research and development project, in which we are developing thin and high efficiency phased array for MPT from FY2009. The
Japanese SPS projects are based on ‘Basic plan for space policy’ which was established by Strategic
Headquarters for Space Policy in June 2009. Beam forming and target detecting algorisms and technologies are also as important as the development of the high efficiency and light weight phased array. There are various beam forming and target detecting techniques for the SPS, for example, retrodirective target detecting with a pilot signal, Rotating Electromagnetic Vector (REV) method, Position and Angle Correction (PAC) method, etc. The Japanese SPS projects involve the verification of the various beam forming and target detecting techniques. In this paper, I show mainly developments of phased array and beam forming and target detecting techniques in the recent Japanese SPS projects.
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