(19)

(11)

EP 0 304 448 A1

(12)

(43) Date of publication: 01.03.1989 Bulletin 1989/09 (21) Application number: 88901906.0 (22) Date of filing: 03.03.1988

(51) International Patent Classification (IPC):  G01S 5/ 00( . ) G01S 13/ 93( . ) G01S 7/ 00( . ) (86) International application number: PCT/GB1988/000162 (87) International publication number: WO 1988/006738 (07.09.1988 Gazette 1988/20)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 03.03.1987 GB 19870004957 30.09.1987 GB 19870022955 (71) Applicant: CALEDONIAN AIRBORNE SYSTEMS LTD. Dyce, Aberdeen AB2 0GA (GB)	(72) Inventor: SAMARAI, Faris Dyce, Aberdeen AB2 0GA (GB) (74) Representative: Gray, Robin Oliver  BARON & WARREN 18 South End Kensington London W8 5BU London W8 5BU (GB)