The impact of beam overlap on probability of detection during a single
scan of a phased-array volumetric scan radar is examined. Both rectan
gular and triangular beam packing arrangements are considered. Beam po
sitions nearby the beam most centered on the target are allowed to con
tribute to the detection process. The treatment of the impact of beam
overlap on target detection for a phased array presented is consistent
with the results that would be achieved by proper use of the search r
adar range equation.