Computer simulation studies of a frequency domain adaptive beamforming algorithm for planar arrays are presented. The algorithm is a modified, complex, least-mean-square (LMS) adaptive algorithm that provides estimates of the spherical coordinates (i.e., range, depression angle, and bearing angle) of multiple broadband targets in both the near-field and far-field regions of a planar array. Computer simulation results comparing the average range, depression angle, and bearing angle estimation errors as a function of the input signal-to-noise ratio (SNR) at a single element in the array, range (near field and far field), and harmonic number (frequency) are presented.