Table 4.4 Issue Timing short term mid term far term space transportation improvement in operational efficiency and costs for current vehicles preliminary studies for future space transportation vehicles improvement in operational efficiency and costs for current vehicles detailed studies and engineering tests for future space transportation vehicles development of improved material for propulsion system development of new propulsion system development of new Earth- to-orbit transportation system (reduced cost, increased rates, mass and volume) improvement in operability and maintainability spacecraft structural and electrical interfaces for the Space-to space antenna and rectenna, development of a deployable phased array structure beam pointing tracking and accuracy (platform and antenna) computer loads for beam pointing development of large deployable solar arrays and phased array antennas development of more efficient solar cells attitude and orbit control of large/very large structures improved maintainability of large structures improve large radiator design power collection conversion and distribution development of high accuracy phase shifter and solid state power amplifier development of a 2.5 GHz phased array development of a 35 GHz large phased array and electronic hardware technology development of affordable low power density rectennae development of more efficient power collection and conversion system improved lifetime of conversion system environment and life sciences determination of effects of beam on electronics determination of the risks to astronauts performing experiments determination of effect of beam on astronomical observation determination of beam on atmosphere and biota (different frequencies) determination of the effects of the beam on communication rectenna effects (construction/habitat destruction, waste heat, etc.) security and maintenance launch effects on biota and atmosphere danger/effects/possibility of space debris comparison of impact of space solar power with other available energy sources at the time of operation determination of large scale and long-term effects on biota and atmosphere determination of large scale effect on communication and astronomy experiments sociopolitical creation of an international organization initiate lobbying of ITU for frequency allocation obtain signatory contributions to space solar power draft environmental impact statement selection of ground station location (negotiation) establishment of a commercial organization power allocation and distribution
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