A system for combining laser ranging and high-speed optical communication reception into a single optical system for low-Earth orbit satellite applications at 1550 nm is proposed. This system would enable both optical data reception and ranging to be performed at one location, provided a satellite has both an SDA-compliant optical terminal and infrared retroreflectors on-board. An analysis of the expected returns is provided for both ideal and poor atmospheric conditions. The ranging system is projected to have a single-shot precision of 2.7 cm with sub-mm normal point accuracy pending further analysis. A system concept is presented, utilizing a single telescope and the same adaptive optics. Other methods of orbit determination using optical techniques are also identified. A proof-of-concept system will be considered for payload testing on the University of Alberta AlbertaSat’s Ex-Alta 4 cubesat, scheduled for launch in 2027-28.
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