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In the past few years, there has been a resurgence in studies towardsspace-based optical/infrared interferometry, particularly with the vision touse the technique to discover and characterise temperate Earth-like exoplanetsaround solar analogues. One of the key technological leaps needed to make sucha mission feasible is demonstrating that formation flying precision at thelevel needed for interferometry is possible. Here, we present $\textit{Pyxis}$,a ground-based demonstrator for a future small satellite mission with the aimto demonstrate the precision metrology needed for space-based interferometry.We describe the science potential of such a ground-based instrument, and detailthe various subsystems: three six-axis robots, a multi-stage metrology system,an integrated optics beam combiner and the control systems required for thenecessary precision and stability. We end by looking towards the next stage of$\textit{Pyxis}$: a collection of small satellites in Earth orbit.

Pyxis: A ground-based demonstrator for formation-flying optical interferometry