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The Askaryan Radio Array (ARA) is an ultra-high-energy (UHE) neutrino detector under construction at the South Pole. Using antennas deployed up to 200m deep in the ice, ARA searches for the impulsive Askaryan radio signals from UHE neutrino interactions. Directional reconstruction of these events is complicated by the inhomogeneity of the polar ice cap, causing the radio waves to bend as they travel through less dense regions close to the surface. To deal with the computational challenges involved, we have developed a spline-based scheme for fast lookup of pre-calculated raytracing results in the ice and air, combined with a parallelized interferometric directional reconstruction. Using these techniques, we demonstrate an angular resolution of $O(1^\circ)$ for neutrino event reconstruction as well as a fast online event filter based on the cross-correlation of antenna signals.

Interferometric Neutrino Event Reconstruction in Inhomogeneous Media with the Askaryan Radio Array