Patrick Loerch, Orbital ATK, Jake Decoto, Orbital ATK
Keywords: SSA, Space based SSA
Abstract:
The number of close approaches between objects in geosynchronous orbits is increasing as the population of Geosynchronous orbit increases. It can be exceedingly difficult to quickly reconstruct these events using only ground or LEO (Low Earth Orbit) based optical observations due to the lack of angular diversity, sensor lighting constraints and sensor tasking limits. This problem is compounded by objects which are frequently maneuvering. This technique uses sets of space and ground based observations to estimate the orbit state of an unknown object relative to a known RSO (Resident Space Object). The orbit state can be estimated using the angular difference between observations of the unknown object and the RSO and using a basic set of assumptions about the orbit with as few as two observations. A range iteration technique is used to solve for the velocity of the object. As more observations are received, the orbit solution can be improved. This technique can provide a first look characterization of high interest events in GEO in order to determine whether or not to task other sensors or increase coverage on unknown objects in proximity to known RSO’s. Analysis will show the limits and results of this algorithm using simulated data.
Date of Conference: September 20-23, 2016
Track: Astrodynamics