Statistics of target-induced array tilt in coherently combined laser array engagements

摘要

The array tilt induced by a rough speckle target illuminated by an optical phased array is investigated. Assuming that the field incident on the target is the focused array field, the mutual intensity of the field backscattered to the array is derived. The array tilt variances and probability density functions are then computed from many realizations of the received speckle field generated using the aforementioned mutual intensity. The array tilt statistics for 7, 19, and 37 element hexagonal arrays are presented and discussed. Holding fill factor constant, it is found that the array tilt variance generally decreases as the array size increases.