The GPS constellation that provides positioning, navigation and timing signals to the US military and civilians around the world, is made up of 31 active satellites. (BlackJack3D/Getty Images) The third generation of GPS satellites continues to deploy, and US Space Force has selected companies to introduce new Low Earth Orbit augmentation (LEAP) under the Resilient GPS program – yet these upgrades, while necessary, are not sufficient to adequately address growing risk from attacks to GPS.