Figure 7.
The 80 × 80 array theoretical beam pattern, pointing to (15°, 15°) direction, for working frequencies: (a) 4 kHz; and (b) 15 kHz.
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.