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.
The combined effect of increased DI and atmospheric attenuation over distance when the emitted frequency is increased from 25 to 50 to 100 kHz and emitter size is constant. An increase in frequency will lead to an increase in source level and thus in echo strength at short ranges. Note that calculations do not include spherical spreading loss or scattering from the target.
