Towards an Accuracy Bound for OTHR

Skywave over-the-horizon radar is a sensor modality that uses refraction of radio waves through the Earth's ionosphere to observe at very long range. An OTHR system uses secondary sensors to probe the ionosphere in order to characterise propagation. The accuracy of estimated positions from OTHR depends on both the radar measurements and the system's ability to map the ionosphere using these secondary sensors. We describe a method to build a Cramer Rao lower bound on localisation accuracy for a realistic OTHR network.