Figure 2. Mean normalized spectra of the echoes.
The spectra were first divided by the emitted signal spectrum to calculate the relative reflected energy at each frequency. The result was then normalized to have a sum of one.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.