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 http://www.intelligent-aerospace.com/articles/2015/02/ia-subhunter-uas.html
BAE Systems to develop ASW drone to help Navy P-8A hunt enemy subs from altitude :
ARLINGTON, Va., 2 Feb. 2015. Anti-submarine warfare (ASW) experts at BAE Systems are developing an unmanned aircraft system (UAS) sensor payload able to look for submerged enemy submarines by detecting small variations in the Earth's magnetic field.
Officials of the U.S. Office of Naval Research (ONR) in Arlington, Va., announced an $8.9 million contract to the BAE Systems Electronic Systems segment in Merrimack, N.H., for the High Altitude ASW (HAASW) Unmanned Targeting Air System (UTAS) program for the Navy Boeing P-8A Poseidon maritime patrol jet.
HAASW UTAS seeks to integrate a magnetic anomaly detector (MAD) and algorithms for use on an air-launched drone that the P-8A will use to detect and pinpoint enemy submarines.
A MAD instrument detects minute variations in the Earth's magnetic field. A submerged submarine represents a mass of ferromagnetic material that creates a detectable disturbance in the Earth's magnetic field.
The Navy's predecessor to the P-8A -- the Lockheed Martin P-3 Orion four-engine turboprop aircraft -- has a MAD sensor attached to the back that looks like a large stinger that protrudes backward from the plane's tail.
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