(19)

(11)

EP 0 877 952 A1

(12)

(43) Date of publication: 18.11.1998 Bulletin 1998/47 (21) Application number: 97906439.0 (22) Date of filing: 29.01.1997

(51) International Patent Classification (IPC):  G01S 13/ 95( . ) G01S 7/ 41( . ) G01S 7/ 20( . ) (86) International application number: PCT/US1997/001389 (87) International publication number: WO 1997/028460 (07.08.1997 Gazette 1997/34)

(84) Designated Contracting States: DE FI FR GB IT (30) Priority: 31.01.1996 US 19960010867P (71) Applicant: UNIVERSITY CORPORATION FOR ATMOSPHERIC RESEARCH Boulder, CO 80307-3000 (US)	(72) Inventor: ALBO, Eugene, David Boulder, CO 80304 (US) (74) Representative: Goodanew, Martin Eric, et al  MATHISEN, MACARA & CO. The Coach House 6-8 Swakeleys Road Ickenham Uxbridge UB10 8BZ Ickenham Uxbridge UB10 8BZ (GB)