A system including an optical receiver to receive a return beam from the target. The optical receiver is to combine a second frequency modulate signal portion transmitted towards a local oscillator with a first frequency modulate portion to produce a beat frequency. The system further including a processor and a memory to store instructions executable by the processor. The processor to sample the beat frequency to produce a plurality of frequency subbands, and classify the plurality of frequency subbands into a plurality of subband types based on a subband criteria. The processor further to select one or more subband processing parameters based on the subband criteria, and process the plurality of frequency subbands, using the subband processing parameters, to determine a range and velocity of the target.