  We propose the use of non-equally spaced decoupling pulses for
high-resolution selective addressing of nuclear spins by a quantum sensor. The
analytical model of the basic operating principle is supplemented by detailed
numerical studies that demonstrate the high degree of selectivity and the
robustness against static and dynamic control field errors of this scheme. We
exemplify our protocol with an NV center-based sensor to demonstrate that it
enables the identification of individual nuclear spins that form part of a
large spin ensemble.
