Abstract
The advantages and limitations of using the pseudorandom-noise (PN)-code
technique in comparison with pulsed direct detection are discussed. Because
the signal-to-noise ratio (SNR) of the PN codes is dependent on the average
atmospheric return, strong returns from short ranges and clouds determine the
SNR for all ranges. The SNR of a profile obtained by pulsed direct detection
exceeds that of the PN-code technique for laser beams with the same average
power.
© 1997 Optical Society of America
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