Advanced Airborne Sensor


The Advanced Airborne Sensor is a multifunction radar installed on the P-8 Poseidon maritime patrol aircraft. The radar is built by Raytheon as a follow-on to their AN/APS-149 Littoral Surveillance Radar System.
The AAS has its roots in the highly classified AN/APS-149 LSRS, which was designed to provide multi-function moving target detection and tracking and high resolution ground mapping at standoff ranges covering land, littoral, and water areas. The radar was deployed on a small number of P-3C Orions, with "game changing" results. Containing a double-sided AESA radar with near 360-degree coverage, it could scan, map, track, and classify targets, and do all of these tasks near simultaneously; it was reportedly sensitive enough to pick up a formation of people moving over open terrain.
Building upon the LSRS, the AAS also has a double-sided AESA radar, which contains a moving target indicator that can detect, classify, and track targets on land and at sea at the same time, with synthetic aperture radar and inverse synthetic aperture radar for picture-like radar imagery of both inland and ocean areas at the same time; these can profile vessels from a long distance and generate fine resolution without relying on optical sensors, especially in day or night and in adverse weather conditions. Once it detects and classifies a hostile vessel, the P-8 can send targeting information to another armed platform and guide a networked weapon to it through a data link. The AAS is in ways superior to the AN/APY-7 used on the U.S. Air Force's E-8 Joint STARS, looking both port and starboard rather than just being side-looking. Other potential missions could include detecting and tracking low flying and stealthy cruise missiles, communications relaying, and electronic warfare as a standoff platform to penetrate contested airspace, since AESA radars are capable of radar jamming, producing fake targets, frying electronic components, and even cyberwarfare.