(19)

(11)

EP 0 383 783 A1

(12)

(43) Date of publication: 29.08.1990 Bulletin 1990/35 (21) Application number: 88908279.0 (22) Date of filing: 19.09.1988

(51) International Patent Classification (IPC):  G01S 3/ 783( . ) G05D 1/ 02( . ) G01S 5/ 16( . ) (86) International application number: PCT/GB1988/000768 (87) International publication number: WO 1989/003076 (06.04.1989 Gazette 1989/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 23.09.1987 GB 19870022403 (71) Applicant: THE SECRETARY OF STATE FOR TRADE AND INDUSTRY IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND London SW1H 0ET (GB)	(72) Inventors: JACKSON, Douglas East Kilbride Glasgow G74 2ES (GB) ROBERTSON, Andrew, Rae Hamilton Nr. Glasgow (GB) (74) Representative: Beckham, Robert William  Defence Research Agency Intellectual Property Department DRA Farnborough R69 Building Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)