(19)

(11)

EP 2 188 719 A1

(12)

(43) Date of publication: 26.05.2010 Bulletin 2010/21 (21) Application number: 08788723.8 (22) Date of filing: 29.08.2008

(51) International Patent Classification (IPC):  G06F 9/48(2006.01) G01S 13/02(2006.01) G01S 13/72(2006.01) (86) International application number: PCT/GB2008/050752 (87) International publication number: WO 2009/034368 (19.03.2009 Gazette 2009/12)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 14.09.2007 GB 0717973 14.09.2007 EP 07270051 (71) Applicant: BAE Systems PLC 6 Carlton Gardens London SW1Y 5AD (GB)	(72) Inventors: WIGMORE, Charles, Christopher Ian Isle Of Wight PO31 8PF (GB) STAFFORD, William, Kenneth Isle Of Wight PO31 8PF (GB) BIRCH, Paul Isle Of Wight PO31 8PF (GB) (74) Representative: BAE SYSTEMS plc Group IP Department  Warwick House P.O. Box 87 Farnborough Aerospace Centre GB-Farnborough, Hampshire GU14 6YU GB-Farnborough, Hampshire GU14 6YU (GB)