Patent Document ID: 8742983
Application ID: 13338641
Patent Flag: 1

Claim One:
1. A weight calculation method comprising: storing a target reflective signal of a radar pulse, which is received via an antenna, at a corresponding cell position according to a reception timing on a plurality of process range cells with a length corresponding to a predetermined distance on a time axis; and calculating a weight on a phase and an amplitude of the received signal, for forming a reception synthesis beam in a manner to reduce directivity in an incoming direction of an undesired wave to null, relative to an incoming direction of the target reflective signal, with use of values stored in the plurality of process range cells, wherein the calculating of the weight includes: calculating a covariance matrix by applying a process (Post-Doppler process) of selecting a plurality of banks after execution of a Doppler filter process to a specified number of pulses of the received signal; and extracting a plurality of arbitrary bank parts from among the plurality of selected banks which are used for the calculation of the covariance matrix, and calculating a plurality of weights on the phase and the amplitude, from a matrix of the plurality of extracted bank parts.