(19)

(11)

EP 1 409 970 A1

(12)

(43) Date of publication: 21.04.2004 Bulletin 2004/17 (21) Application number: 02733761.7 (22) Date of filing: 19.06.2002

(51) International Patent Classification (IPC)7: G01F 23/284 (86) International application number: PCT/SE2002/001227 (87) International publication number: WO 2003/001160 (03.01.2003 Gazette 2003/01)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 21.06.2001 SE 0102283 (71) Applicant: SAAB MARINE ELECTRONICS AKTIEBOLAG 402 51 Göteborg (SE)	(72) Inventors: AKERSTRÖM, Tomas S-426 58 V. Frölunda (SE) WESTERLIND, Hans S-436 39 Askim (SE) (74) Representative: Hammond, Andrew David  Ström & Gulliksson IP ABSjöporten 4 417 64 Göteborg 417 64 Göteborg (SE)