USE OF THE A1-SEUENCE AND THE A2-SEQUENCE TO MODULATE CONTINUOUS-WAVEPSEUDORANDOM NOISE LIDAR

The A1-sequences and the A2-sequences have been proposed to replace th e M-sequence that is generally used to modulate continuous-wave pseudo random noise lidar. These new sequences, under two hypotheses, provide a reduction in the background noise, which is especially significant in noisy conditions when one uses M-sequences. We show that one of the se two hypotheses is not verified for cloudy atmospheric conditions. T hus, the A1- and the A2-sequences cannot be used for such conditions. (C) 1998 Optical Society of America.