The in-ice radio interferometric phased array technique for detection of highenergy neutrinos looks for Askaryan emission from neutrinos interacting inlarge volumes of glacial ice, and is being developed as a way to achieve a lowenergy threshold and a large effective volume at high energies. The techniqueis based on coherently summing the impulsive Askaryan signal from multipleantennas, which increases the signal-to-noise ratio for weak signals. We reporthere on measurements and a simulation of thermal noise correlations betweennearby antennas, beamforming of impulsive signals, and a measurement of theexpected improvement in trigger efficiency through the phased array technique.We also discuss the noise environment observed with an analog phased array atSummit Station, Greenland, a possible site for an interferometric phased arrayfor radio detection of high energy neutrinos.
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