Worst-case GPS constellation for testing navigation at geosynchronous orbit for GOES-R

Physics & Astronomy

• geosynchronous orbits 100%
• constellations 89%
• navigation 85%
• maneuvers 75%
• receivers 57%
• requirements 23%
• stations 22%
• spacecraft 20%
• stationkeeping 20%
• low visibility 18%
• product development 16%
• weather 14%
• budgets 12%
• lobes 11%
• availability 11%
• simulation 8%
• computer programs 8%
• shift 6%
• performance 5%

Engineering & Materials Science

• Orbits 60%
• Global positioning system 59%
• Satellites 53%
• Navigation 52%
• Testing 35%
• Weather satellites 9%
• Visibility 6%
• Navigation systems 6%
• Spacecraft 5%
• Earth (planet) 5%
• Availability 4%

Earth & Environmental Sciences

• GOES 83%
• navigation 63%
• GPS 55%
• spacecraft 11%
• station 7%
• visibility 6%
• simulation 5%
• budget 5%
• weather 4%
• software 4%
• engineering 3%
• program 3%
• test 2%