WASHINGTON Oct 22 (Reuters) - Raytheon Co , maker of the Patriot missile system, said it expects to finalize a contract for an early warning radar system with Qatar in 2016, valued at approximately $1 billion.

The deal had been approved by Congress and the U.S. government, but because of a change in the contract, Raytheon will again require congressional approval, Chief Executive Officer Tom Kennedy told analysts after reporting third-quarter earnings.

In 2013 the U.S. government notified Congress that Qatar was interested in purchasing one early warning radar system for $1.1 billion.

(Reporting by Idrees Ali) ((Idrees.Ali@thomsonreuters.com;))

Keywords: US DEFENSE