Expected performance of interferometric air-shower measurements with radio antennas

Interferometric measurements of the radio emission of extensive air showers allow reconstructing cosmic-ray properties. A recent simulation study with an idealised detector promised measurements of the depth of the shower maximum $X_{max}$ with an accuracy better than 10 g cm$^{−2}$ [1]. In this contribution, we evaluate the potential of interferometric $X_{max}$ measurements of (simulated) inclined air showers with realistically dimensioned, sparse antenna arrays. We account for imperfect time synchronisation between individual antennas and study its inter-dependency with the antenna density in detail.
We find a strong correlation between the antenna multiplicity (per event) and the maximum acceptable inaccuracy in the time synchronisation of individual antennas. From this result, prerequisites for the design of antenna arrays for the application of interferometric measurements can be concluded.
For data recorded with a time synchronisation accurate to 1ns within the commonly used frequency band of 30MHz to 80MHz, an antenna multiplicity of $≳50$ is needed to achieve an $X_{max}$ reconstruction with an accuracy of 20 g cm$^{−2}$.
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This multiplicity is achieved measuring inclined air showers with zenith angles $θ≥77.5°$ with 1km spaced antenna arrays, while vertical air showers with zenith angles $θ≤40°$ require an antenna spacing below 100m. Furthermore, we find no improvement in $X_{max}$ resolution applying the interferometric reconstruction to measurements at higher frequencies, i.e., up to several hundred MHz.