Phase Synchronous System of Separated Units

Details Phase Synchronous System of Separated Units Phase Synchronous System of Separated Units

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.567..139t&link_type=abstract

Proceedings of The 4th International Conference on Solar Power from Space - SPS '04, together with The 5th International Confere

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Scientific paper

When SSPS(Space Solar Power System) is practically operated, plural units of microwave transmission in a satellite should work in collaborate style with each other, in order to transmit sufficient power to the earth. However, if each microwave transmission unit operates individually, a direction of a microwave beam varies from time to time or it is impossible to direct the beam to rectennas on the earth. In this study, firstly, some methods for frequency and phase synchronization were investigated and some simulations for phase difference detection between two units using phase modulation technique were performed. Furthermore, proto type equipments were developed, and it was experimentally examined that the requirement such as the frequency stability was less than 0.6 ppm and that the phase difference was less than 3.5 degrees.

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