(19)

(11)

EP 0 577 687 A1

(12)

(43) Date of publication: 12.01.1994 Bulletin 1994/02 (21) Application number: 92907634.0 (22) Date of filing: 24.03.1992

(51) International Patent Classification (IPC):  H03C 5/ 00( . ) G01S 13/ 82( . ) H04B 1/ 59( . ) H04J 13/ 00( . ) G01S 13/ 75( . ) G06K 7/ 00( . ) H04B 1/ 707( . ) H04J 13/ 10( . ) (86) International application number: PCT/AU1992/000123 (87) International publication number: WO 1992/017947 (15.10.1992 Gazette 1992/26)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 28.03.1991 AU 19910005366 (71) Applicant: MAGELLAN CORPORATION (AUSTRALIA) PTY. LTD. Canning Vale, W.A. 6155 (AU)	(72) Inventor: BROOKS, David, Robert Greenmount, W.A. 6056 (AU) (74) Representative: Newby, Martin John, et al  J.Y. & G.W. Johnson Furnival House 14-18 High Holborn London WC1V 6DE London WC1V 6DE (GB)