43.01 (-1.57) 
The AN/APS-137B(V)5 is the only production radar system that provides both multi-resolution SAR and ISAR, allowing exceptional surveillance capability over land, sea, and in littoral regions.
The APS-137 family of radars has consistently demonstrated outstanding performance in anti-submarine warfare (ASW) and anti-surface warfare (ASuW). Current operational capabilities include long-range surface search and target tracking, periscope detection in high sea states, ship imaging and classification using Inverse Synthetic Aperture Radar (ISAR), and Synthetic Aperture Radar (SAR) for overland surveillance, ground mapping, and targeting.
Historically, the U.S. Navy's maritime mission has consisted of blue water (open ocean) operations only. Today, the main threat is littoral warfare which requires mission capability in the land-water transition region. The Navy's ASuW Improvement Program (AIP) was initiated to meet this new operational requirement.
The APS-137B(V)5 radar was designed for the AIP to provide high-resolution ISAR for imaging and classifying small, fast-moving vessels that operate close to the shore and SAR for imaging stationary ships and boats as well as coastal and overland surveillance. The new SAR mode provides multiple resolution strip map and spot SAR operation, and has high-resolution capability for target ID, battle damage assessment (BDA), and targeting.
Since the first AIP P-3 squadron deployed with the APS-137B(V)5 in May 1998, they have been in constant demand to support regional conflicts and peacekeeping operations. The capabilities and performance of the APS-137 radar have received high praise from the fleet as a true force multiplier.
Other related programs and upgrades include a precision targeting capability at long stand-off ranges, a ground moving target indication (GMTI) mode, and a variant suitable for the S-3B aircraft.
The latest generation of the AN/APS-137 has been granted a new nomenclature, the AN/APY-10, by the U.S. Navy because of Raytheon's many innovations to the radar for the P-8A Multi-mission Maritime Aircraft (MMA).
