GEO-SBSP2

2013 Conference NOTES from slides:

SSP Assembly Challenges      Gordon Woodcock

• 4000 MW solar cell
• 2000 MWe to grid(?)
• High Temp Superconductors ??? 77K

• 600 launches, 4e7 kg? 15km²?

• 5.8 GHz

Introduction to Space Solar Power for the Global Electric Power Utility Market

• WiSEE SSP Workshop
• November 8, 2013
• Baltimore, MD
• Darel Preble
• President, Space Solar Power Institute www.solarsat.org
• Chair, Space Solar Power Workshop www.sspi.gatech.edu

• p24 Sidelobe Graph - 0.01mW/cm² peak at 440km radius

• Predicted ground-level microwave power density for a full-power GEO SPS as a function of distance -Credit: J. M. Osepchuk, IEEE Microwave, “How Safe Are Microwaves and Solar Power from Space”, IEEE Microwave magazine, vol. 3, issue 4. page 58-64, Dec. 2002.
• p34 Communication satellites are now a $250+ Billion industry per year.
• p42 GSO launches and forecast

• p44 picture of ATK space systems 20 meter solar sail. Conflated with solar cell? larger

  • no way to move power out of cells that thin; the cells make perhaps 200 amps per square meter at about a volt. IR drop would be awful for a large array with gossamer-thin conductors. Monocrystalline photovoltaic cells do not fold the way these aluminized mylar films do.
• assumes thinned silicon, shows graph on page 45 with exotic multjunctions at 46%, silicon ranging from 13% to 25%. Thin silicon at back end of life will be closer to the first number.
• may not understand that "dispatchable" means adjustable to time demand, opposite of base load
• 99.3% available means up to 72 minute eclipse loss for 22 days in spring and fall
  • nothing about shutting down to avoid communication interference

• nothing about >= 50m/s/year stationkeeping

• nothing about coexistence with existing comsats

Mission design of WPT Space Demonstration Experiment using Small Scientific Satellite toward SPS     Tanaka

• 5.729 GHz 370km orbit 200kg 2kW 1.9m antenna
• ground 16μW/m2（MAX）Beam width on the ground φ ～30km

SSP: Hearts and Minds     Brent Sherwood

• p8 Geopolitics: Urban Geography from GEO city longitude

Contreras LEO SSPS in 1620km orbit