Measurement of the element to element phase tracking of a broadband interferometer array

The author presents an extension of previous work that determined the location of the phase center of a spiral relative to the center of rotation of the ground plane from the far field phase and amplitude data as a function of frequency. The location of each element of the array is determined using this technique, and then the difference between the far field phase patterns is determined by removing the phase variations induced by differences in position. This technique was applied successfully to the measurement of a variety of interferometer arrays ranging in operating frequency from 500 MHz to 18 GHz.<>