Patent ID: 8405549

Claim:
Method for determining whether a target is within a direction sector of interest of a direction finder, which comprises: a. predefining said direction sector of interest as a specific threshold difference between an R reference value and an N null value; b. providing at least two antennas arranged in a broad-side configuration within the direction finder; c. generating an in-phase reference pattern using at least one of said antennas, and establishing wireless communication between the direction finder and said target; d. attenuating the wireless communication signal between the direction finder and said target until the wireless communication is lost, and recording the attenuation value which corresponds to said loss of wireless communication as the R reference value; e. generating an out-of-phase null pattern using at least two of said antennas, and re-establishing wireless communication between the direction finder and said target; f. attenuating the wireless communication signal between the direction finder and said target until the wireless communication is lost, and recording the attenuation value which corresponds to said loss of wireless communication as the N null value; g. determining whether the difference R−N is above or below said threshold difference, wherein a difference R−N above said threshold is an indication that the target is within said direction sector of interest, and wherein a difference R−N below said threshold is an indication that the target is out of said direction sector of interest.