Retrodirective System for Solar Power Satellites
- Paper number
IAC-06-C3.1.09
- Author
Prof. Kozo Hashimoto, Kyoto University, Japan
- Coauthor
Prof. Hiroshi Matsumoto, Kyoto University, Japan
- Year
2006
- Abstract
Solar power satellites (SPSs) will use a retrodirective system in order to transmit back a power beam collectly to the arrival direction of a pilot signal sent from a rectenna site on the ground. 1) Although retroduirective systems which correspond to a carrier have generally been proposed and examined, they have a possiblity to respond to an unexpected signal or a fake signal and transmit the power to an undesired direction. It is recommended to use a spread spectrum modulation or other modulations should be used for the pilot signal to aviod such problems. 2) Phase errors in the pilot signal reception are serious problem since a high-precision direction of arrival (DOA) measurement is necessary. A self-calibration system would be useful in such a huge array as an SPS. 3) Phase adjustments for a transmitting array and pahse synchronization among reference oscillators are also a big problem. 4) A limitation on the small-scale demonstration of a retrodirective system is identified. Some solutions and trials for these problems will be introduced. A software retrodirective sistem is a useful one since a necessary response time is slower than that for an application to communications.
- Abstract document
- Manuscript document
IAC-06-C3.1.09.pdf (🔒 authorized access only).
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