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.
Geometrical optics depiction of SHWS lenslet images due to a dual layer beacon with on- and off-axis beacon illumination. The red and green SHWS lenslet images correspond to layers 1 and 2, respectively, and the black crosshairs to the lenslet where the beacon image shift is minimal.
