Method for calculating spacing ratio of interferometer array antenna for direction finder

A method for calculating a spacing between antenna elements of an interferometer array antenna, the method comprising:

• setting an azimuth of an instantaneous field of view (IFOV) and a distance between phase differences with respect to signals received via the array antenna, and obtaining the number of phase difference lines and phase difference vectors with respect to the phase differences of the signals output in a phase comparator of a direction finder;
• performing a modular arithmetic for the phase difference vectors to obtain phase difference matrixes;
• obtaining a transformation matrix for linearly transforming the phase difference matrixes and performing the linear transformation using the transformation matrix;
• calculating a distance between the phase differences on a new axis generated by the linear transformation;
• and
• calculating an antenna spacing as an array spacing of the array antenna, the antenna spacing meeting that the distance between the phase differences is greater than a desired distance between phase differences.