(19)

(11)

EP 1 282 896 A2

(12)

(88) Date of publication A3: 21.02.2002 (43) Date of publication: 12.02.2003 Bulletin 2003/07 (21) Application number: 01900485.2 (22) Date of filing: 08.01.2001

(51) International Patent Classification (IPC)7: G10K 9/122, B06B 1/06 (86) International application number: PCT/GB0100/054 (87) International publication number: WO 0105/2593 (19.07.2001 Gazette 2001/29)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR (30) Priority: 14.01.2000 GB 0000703 (71) Applicant: THOMSON MARCONI SONAR LIMITED Farnborough, Hampshire GU14 6YU (GB)	(72) Inventor: Smith, Grant Bedford,Bedfordshire MK44 2DH (GB) (74) Representative: Lucas, Laurent Jacques  Thales Intellectual Property,13, avenue du Président Salvador Allende 94117 Arcueil Cedex 94117 Arcueil Cedex (FR)