An official website of the United States government
The .gov means it's official. Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you're on a .gov or .mil site by inspecting your browser's address (or "location") bar.
This site is also protected by an SSL (Secure Sockets Layer) certificate that's been signed by the U.S. government. The https:// means all transmitted data is encrypted - in other words, any information or browsing history that you provide is transmitted securely.
The U.S. military relies upon GPS for navigation, weapons targeting and situational awareness. However, this reliance bears the risk of information being denied or spoofed by enemy forces or simply unavailable. Polaris offers SkyPASS as an azimuth sensor that does not rely upon GPS information. Instead, SkyPASS derives information from a natural phenomenon—the pattern of polarization in skylight. SkyPASS is less expensive and more accurate than other methods for measuring absolute roll, pitch and yaw. As one element in a system of systems that provides navigation information, SkyPASS can serve as a verification method for other systems and can serve as a primary technology when GPS data are degraded or denied.
The Department of Defense is America's oldest and largest government agency. With our military tracing its roots back to pre-Revolutionary times, the Department of Defense has grown and evolved with our nation.
The mission of the Department of Defense is to provide the military forces needed to deter war and to protect the security of our country. The department's headquarters is at the Pentagon.