The Relay Mirror Experiment (RME) required continuous illumination of its satellite by ground-based lasers. To maintain tracking, the system relied on an array of six-inch diameter hollow retroreflectors, mounted on the lower deck of the spacecraft. The retroreflectors are tailored to the mission, including compensation for their orbital velocity. The array has a lidar cross section of up to 3,000 square kilometers. This paper describes the design, construction, testing, and use of this retroreflector array.
James W. Baer, James W. Baer,
"High cross-section orbital retroreflector array design and testing", Proc. SPIE 1697, Acquisition, Tracking, and Pointing VI, (25 November 1992); doi: 10.1117/12.138197; https://doi.org/10.1117/12.138197