Publications

The Integrated LCRD LEO User Modem and Amplifier Terminal (ILLUMA-T) payload was the first space-based user terminal to demonstrate successful two-way optical communications with a ground terminal via NASA's Laser Communications Relay Demonstration (LCRD). In order to acquire the link, the ILLUMA-T optical module open loop points a wide beacon at the LCRD acquisition sensor. The initial pointing of the beacon is based on real-time ISS position and attitude information and precalculated LCRD ephemeris. This paper examines the on-orbit pointing performance of ILLUMA-T during the mission.