Raytheon Technical Services Co. in Indianapolis won a $47 million deal to make infrared systems for U.S. Army armored vehicles, continuing a string of sizable military contracts its has scored this year.

The Department of Defense announced the latest contract on Friday. Raytheon will make 250 so-called Jackal passive infrared defeat systems.

Work is expected to be complete by Oct. 15, 2011. Officials sought and received one bid as part of a rapid-acquisition program created to respond to combat emergencies.

A division of massive defense and government contractor Raytheon Co. of Waltham, Mass., the 1,100-employee local operation has landed at least four other sizable military contracts this year.

Last month, Raytheon was awarded a $42 million contract to make forward-looking infrared sensors for the U.S. Air Force’s HH-60G helicopter.

In late June, it won a $250 million contract to work on software that controls electronics on the U.S. Navy’s V-22 Osprey tilt-rotor aircraft.

In March, it was awarded a $32.4 million deal to develop a bomb rack for Navy airplanes. If the Navy executes a full manufacturing contract, it could be worth another $169 million to Raytheon.

Also in March, Raytheon got an $18.9 million Navy contract to make guided missile launchers for F/A-18 Hornet fighter jets.

The military work has been a boon to Raytheon’s Indianapolis plant at 6125 E. 21st St., which shed 77 jobs last September.

Its parent company employs more than 75,000 people worldwide, pulling in revenue of $25 billion in 2009.