Patent ID: 11876590
Assignee: AGENCY FOR DEFENSE DEVELOPMENT
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A beam search device using an active phased array antenna, the beam search device using a single tile-type phased array antenna including a plurality of radiating elements arranged in a matrix form, wherein the phased array antenna comprises a plurality of sub-arrays including the plurality of radiating elements and arranged in one direction, the beam search device comprising:
a controller,
wherein the controller calculates a beam coefficient application vector for each of the sub-arrays by using a received signal for each of the sub-arrays and a beam coefficient for each of the sub-arrays,
determines, as an initial value, a beam coefficient of an effective sub-array corresponding to a maximum value from among absolute values of beam coefficient application vectors for each of the sub-arrays, and
performs a monopulse algorithm based on the initial value, to obtain an expanded beamwidth greater than a reference beamwidth, which is a range of a beam detected by the phased array antenna,
wherein the controller performs the monopulse algorithm on an effective sub-array corresponding to the initial value, and in performing the monopulse algorithm,
determines a midpoint of the effective sub-array, and
calculates a summation coefficient for radiating elements arranged on both sides of the midpoint,
wherein the summation coefficient comprises: a first summation coefficient for a first radiating element group arranged on one side of the midpoint and a second summation coefficient for a second radiating element group arranged on the other side of the midpoint, and
the effective sub-array comprises an overlapping portion including overlapping elements used for both calculation of the first summation coefficient and calculation of the second summation coefficient.