Northrop Grumman has developed the only 360 degree, spherical situational awareness system in the electro-optical distributed aperture system (DAS). The DAS surrounds the F-35 aircraft with a protective sphere of situational awareness. It warns the pilot of incoming aircraft and missile threats as well as providing day/night vision, fire control capability and precision tracking of wingmen/friendly aircraft for tactical maneuvering.

More at http://www.es.northropgrumman.com/solutions/f35targeting/