Vehicle guidance systems

US4079801A · kind A · utility

Assignee

• NATIONAL RESEARCH DEVELOPMENT CORPORATION · GB

Inventor

• John Dobson · Paris, CA

Key dates

• Filing date: Aug 3, 1976
• Grant date: Mar 21, 1978
• Expiry date: Aug 3, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D1/0265
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A vehicle guidance system is described in which vehicles are steered in accordance with signals picked up from a leader conductor positioned along a route. By passing two signals at different frequencies along the leader conductor and having two receivers on each vehicle, each sensitive to one of the frequencies only, interfering signals from currents induced in other conductors along the route, such as reinforcing bars in concrete roads or structures are substantially eliminated. Ways of combining the signals from the receivers to provide interference free steering control signals are described.