Method of and apparatus for target tracking

US3954340A · kind A · utility

Assignee

• AB Bofors

Inventors

• Ake Blomqvist · Karlskoga, SE
• Bertil Eriksson · Bissenkamp, SE

Key dates

• Filing date: Mar 11, 1974
• Grant date: May 4, 1976
• Expiry date: Mar 11, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S17/42
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to optical target tracking. A target image, particularly based on reflected laser light, is projected by an optical system onto a light-sensitive detector, control signals for directing purposes being generated depending on the position of the target image on the detector surface. At least when a clear target image on the detector surface would be small in comparison with the detector surface, the area of the target image is increased by blurring the target image, for instance by displacing the detector plane from the image plane of the optical system.