**4.6 Real-time wind measurement**

In this section, real-time wind measurements are reported. Real-time measurements are recoded continuously, thanks to FPGA pre-processing techniques that allow for streaming of either power spectrum or autocorrelation of received signals instead of raw data. The instrument was installed in our research vehicle that is located at the City College of New York at upper Manhattan, New York (latitude: 40.49°N, longitude: 73.56°W). Laser pulses are transmitted into the atmosphere through an opening in the vehicle's roof, **Figure 8**. The following subsections introduce vertical wind velocity measurements using FFT and autocorrelation preprocessing techniques. Horizontal wind speed measurement is also introduced.
