High-energy in-ice particle cascades can originate from either cosmic-neutrino interactions in
the ice medium itself, or cosmic-ray air showers propagating into a high-altitude ice sheet. After
passing through the ice medium, a short-lived ionization trail is left in its wake that can be detected
using radar. We present the expected radar signal and discuss its main features. Understanding
the detailed signal properties are crucial in the detection and reconstruction of UHE cosmic-rays
and neutrinos using the radar echo method.