Geosynchronous Space Situational Awareness Program (GSSAP) is primarily used for which function?

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Space surveillance—tracking and monitoring objects in space, especially in geosynchronous orbit, is what GSSAP is designed to do. These satellites provide high-precision observations of objects in GEO, allowing operators to detect, identify, and characterize resident space objects (defunct satellites, functioning spacecraft, debris) and to determine their orbits with greater accuracy. This supports conjunction assessments and overall space-domain awareness, helping to keep track of what’s present in the GEO region and how it’s moving.

Missile warning relies on different sensors and systems focused on detecting launch events and initial trajectories, not the ongoing cataloging of GEO objects. Meteorology covers weather-related data, which is unrelated to tracking space objects. PNT/velocity information pertains to positioning, navigation, timing, and velocity services like GPS, not monitoring space object populations. So the primary function here is space surveillance.