A ground-penetrating radar is an extensively used geophysical tool in cryosphere sciences (ice sheets and glaciers) with sounding depths of several kilometers due to the small radio-wave attenuation in ice sheets. The detection of the ice thickness and internal ice stratigraphy with commercial radars has become standard. However, there is still an observational gap in determining dielectric and mechanical ice-fabric anisotropy and basal properties using these systems. Recently, a groundbased phase-coherent radar showed its potential to fill this gap. However, this requires that the corresponding groundbased radars cover profiles several tens of kilometers in length. We address this challenge by modifying an autonomous rover to collect phase-coherent, quad-polarimetric radar data geolocated with real-time kinematic (RTK) positioning. In a proof-ofconcept study in Antarctica, we demonstrate that this allows the collection of quad-polarimetric data along a 23-km profile, mapping anisotropic ice-fabric properties at <100-m intervals across the transition of grounded to floating ice. This study shows the possibility of collecting data that will refine ice-flow models by providing missing rheological parameters. This work also demonstrates the versatility of the autonomous ground vehicle with its ability to tow more than 200-kg payload, with a battery run time of over 6 h, and with a modular design that enables future integration of different radars or other geophysical sensors.