“…This small frequency shift results in a beam whose direction changes with time, and it is possible to ‘illuminate’ a particular range and angular location at some pre‐specified instant of time [5]. This is significantly different than the conventional phased array [7], where the beam pointing direction is independent of range and time. The FDA is also different from the coherent multiple‐input multiple‐output (MIMO) technique [8], which uses large frequency separations between different spatial channels.…”