GEO mm Wave Dynamic System Concept: Minimize various size requirements of space and ground segments through use of millimeter wave transmission at 245 GHz. GEO-based orbit for collector, which is inclined 8.7 degrees to avoid Earth’s shadow. Solar dynamic energy conversion on board. Key Features: Brayton Cycle thermodynamic conversion 3 square km of collection area per spacecraft Electric Propulsion for LEO-GEO transfer and station keeping Beam switching to various sites to avoid atmospheric attenuation Ground segment 1.15 x 1.15 km Suggestor/Source: J. Nainiger, NASA/LeRC Discussion Atmospheric interference would need to be managed via active beam switching to alternate ground stations to avoid storms. However, cloud cover will likely eliminate this concept from supplying continuous power. Advantages Disadvantages Single unit deployment possible Self transfer via electric propulsion from LEO to GEO Interesting for space power applications High technical risk in RF system at these frequencies Maintenance issues for Brayton system and for RF tubes
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