  In this paper we present a novel beamforming technique that can be used with
an array of quantum sensors. The transmit waveform is a short-duration
frequency comb constructed using a finite number of sinusoidal tones separated
by a fixed offset. Each element in the array is tuned to one of the tones. When
the radiated signal is received by the aperture, each array element accumulates
phase at a different rate since it is matched to only one frequency component
of the comb waveform. The result is that over the duration of the received
pulse, progressively higher spatial frequencies are generated across the
aperture. By summing the outputs of all the array elements, a strong peak is
created in k-space at the precise time instant when the phases of all the array
elements align. The k-space coordinates of the output can then be transformed
to angles as discussed in the paper. This paper also describes how to set
waveform parameters and the separation between array elements. A desirable
advantage of the proposed approach is that the received signal is amplified by
the coherent integration gain of the entire spatial aperture.
