Signal processing apparatus and signal processing method

A signal processing apparatus comprising:

• a plurality of Doppler variation compensation circuitries coupled to respective antennas included in a plurality of antennas of a communication apparatus, each compensating for a Doppler shift variation that is a time variation of a Doppler shift with respect to one of a plurality of pieces of waveform data indicating a waveform of a wireless signal having been received by one of the respective antennas of the plurality of antennas;
• a plurality of filters coupled to respective one of the plurality of Doppler variation compensation circuitries, each extracting one of a plurality of narrowband signals having a bandwidth equivalent to a bandwidth of a desired signal or a bandwidth obtained by adding a predetermined margin to the bandwidth of the desired signal from one of the plurality of pieces of waveform data in which the Doppler shift variation has been compensated by one of the respective ones of the plurality of Doppler variation compensation circuitries;
• and
• a reception beam controller, performing reception beam control by an adaptive array for the plurality of narrowband signals having been extracted by the plurality of filters.