| Project/Area Number |
13680577
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
エネルギー学一般
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
HASNIMOTO Kozo Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (80026369)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Naoki Kyoto University, Radio Science Center for Space and Atmosnhere. Associate Professor, 宙空電波科学研究センター, 助教授 (10283657)
MATSUMOTO Hiroshi Kyoto University, Radio Science Center for Space and Atmosphere, Professot, 宙空電波科学研究センター, 教授 (00026139)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Solar Power Satellite / Station / Spread Spectrum / Array Antenna / Retrodirective / Beam forming / Microwave Power Transmission / Genetic Algorithm |
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| Research Abstract |
Solar Power Satellite is a clean and inexhaustible energy source and one of promising methods to save the energy crisis. Microwave energy transmission is one of key technologies of the SPS. The retrodirective array is used in order to direct a power beam to a rectenna site (power receiving site). A pilot signal is sent from the receiving cite and we apply the spread spectrum (SS) modulation to this signal. This method is robust to noises, can differentiate the signal from interferences and cope with multiple pilot signals
A new microwave power transmission system using a SS pilot signal is developed for the SPS (Solar Power Satellite). The antennas and a frequency band are shared by both power transmitters and pilot signal receivers by band elimination filters and software synchronization detection. Fundamental characteristics of phase-difference detection between two channels of a pilot signal are evaluated. An experiment with an 8-element array antenna was performed and the direction of arrival was successfully detected under transmitting power from the same antennas. The SS pilot signal system was made for 2.45 GHz and applied to 5.8 GHz SPORTS (Space Power Radio Transmission System). Single- and multi-beam forming for uniformly excited antenna array is optimized using the genetic algorithm
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