WIND MEASUREMENT COHERENT LIDAR DEVICE

摘要

A noise spectral differential unit 10 records a noise spectrum in a state without any received signal, and subtracts the noise spectrum from a received signal spectrum. An offset corrector 11 performs offset correction of the signal spectrum obtained by subtracting the noise spectrum by the noise spectral differential unit 10 with respect to the noise level at a frequency separated from the frequency peak position of the received signal by a prescribed value. A frequency shift analyzer 12 executes signal processing of the signal spectrum resulting after the offset correction and measures a frequency shift. A wind velocity converter 13 makes wind velocity detection from the frequency shift measured by the frequency shift analyzer 12.