(19)

(11)

EP 0 771 495 A1

(12)

(43) Date of publication: 07.05.1997 Bulletin 1997/19 (21) Application number: 96914652.0 (22) Date of filing: 16.05.1996

(51) International Patent Classification (IPC):  H04B 1/ 713( . ) H04L 27/ 10( . ) (86) International application number: PCT/US1996/007023 (87) International publication number: WO 1996/037060 (21.11.1996 Gazette 1996/51)

(84) Designated Contracting States: DE GB (30) Priority: 19.05.1995 US 19950444608 (71) Applicant: Lockheed Martin Corporation Nashua, NH 03061 (US)	(72) Inventor: HERRICK, David, L. Mont Vernon, NH 03057 (US) (74) Representative: Boon, Graham Anthony  Elkington and Fife, Prospect House, 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)