Beam formation device, radar device, and beam formation method

A radar device comprising:

• the processing circuitry
• to calculate a Doppler spectrum from a reception signal of each of a plurality of reception antennas, and calculate a reception signal vector including the Doppler spectrum calculated from the reception signal of each of the reception antennas,
• calculates a correlation matrix regarding the reception signal vector,
• detects a target Doppler bin that is a Doppler bin in which a target signal is present from the correlation matrix and the reception signal vector,
• to remove, from the correlation matrix, the target signal in the target Doppler bin so as to calculate a target-signal-removed correlation matrix from which the target signal has been removed,
• to calculate an adaptive weighting of the reception signal vector from the target-signal-removed correlation matrix,
• to form an adaptive beam from the reception signal vector and the adaptive weighting, and
• to detect a target from the adaptive beam.

Abeam formation method comprising:

• calculating a Doppler spectrum from a reception signal of each of a plurality of reception antennas, and calculating a reception signal vector including the Doppler spectrum calculated from the reception signal of each of the reception antennas,
• calculating a correlation matrix regarding the reception signal vector,
• detecting a target Doppler bin that is a Doppler bin in which a target signal is present from the correlation matrix and the reception signal vector,
• removing the target signal in the target Doppler bin from the correlation matrix, so as to calculate a target-signal-removed correlation matrix from which the target signal has been removed,
• calculating an adaptive weighting of the reception signal vector from the target-signal-removed correlation matrix, and
• forming an adaptive beam from the reception signal vector and the adaptive weighting.