**5.2 Vertical wind velocity measurements using autocorrelation pre-processing algorithm**

In this section, wind velocity was measured in a vertical mode while preprocessing received signals using an autocorrelation algorithm. The autocorrelation algorithm calculates the autocorrelation of the received signals and streams out the lags matrix that can be gated according to user's range resolution's preference. That feature makes autocorrelation technique advantageous over the FFT technique, where range gates are fixed. Wind velocity was measured under this mode of operation on July 12th, 2012, **Figure 13**.

**Figure 13.**

*Vertical wind velocity (m/s) vs. time and height measured at CCNY remote sensing laboratory between 14:01– 18:00 PM EDT on July 12th, 2012.*
