UNIFORMLY REDUNDANT ARRAYS

Uniformly Redundant Arrays (URA's) are two-dimensional binary arrays w ith constant sidelobes of their periodic autocorrelation function. The y are widely agreed upon to be optimum mask patterns for coded apertur e imaging, particularly in imaging systems with a cyclic coded mask. I n this paper, a survey of all currently known construction methods for URA's is given and the sizes and open fractions of the arrays resulti ng from each construction method are pointed out. Alternatives to URA' s for situations in which a URA does not exist, are discussed.