For decades, the Pentagon has been the world’s largest oil consumer, and as global petroleum prices continue to rise, the military has been searching for feasible energy alternatives. Now they’re looking in space.
The U.S. Naval Research Laboratory (NRL) is building technology that will allow the military to capture solar power in orbit and project it back down to Earth. Not only would space solar potentially save the Pentagon buckets of cash, but it could simplify military deployments. Fuel tankers would no longer have to reach remote or volatile areas, and missions could run longer without having to return to base to refuel.
So far, NRL has built and tested two different prototypes of what they call a “sandwich” module, named for a design innovation that packs all the electrical components between two square panels. The top side is a photovoltaic panel that absorbs the Sun’s rays. An electronics system in the middle converts the energy to a radio frequency, and the bottom is an antenna that transfers the power toward a target on the ground.
Ultimately, the idea is to assemble many of these modules in space by robots — something the NRL’s Space Robotics Groups is already working on — to form a one kilometer, very powerful satellite.
Towards Space Solar Power - Examining Atmospheric Interactions of Power Beams with the HAARP Facility
Authors:
Leitgab and Cowley
Abstract:
In the most common space solar power (SSP) system architectures, solar energy harvested by large satellites in geostationary orbit is transmitted to Earth via microwave radiation. Currently, only limited information about the interactions of microwave beams with energy densities of several tens to hundreds of W/m2 with the different layers of the atmosphere is available. Governmental bodies will likely require detailed investigations of safety and atmospheric effects of microwave power beams before issuing launch licenses for SSP satellite systems. This paper proposes to collect representative and comprehensive data of the interaction of power beams with the atmosphere by extending the infrastructure of the High Frequency Active Auroral Research Program (HAARP) facility in Alaska, USA. Estimates of the transmission infrastructure performance as well as measurement devices and scientific capabilities of possible upgrade scenarios will be discussed. The proposed upgrade of the HAARP facility is expected to deliver a wealth of data and information which could serve as a decision base for governmental launch licensing of SSP satellites, and which can be used in addition to deepen public acceptance of SSP as a large-scale renewable energy source.
