Arrangement for position-selective speed measurement using the doppler principle

US5784024A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Patric Heide · Vaterstetten, DE
• Richard S. Schubert · Vashon, US
• Rudolf Schwarte · Netphen, DE
• Valentin Magori · Gernsheim, DE

Key dates

• Filing date: Dec 10, 1996
• Grant date: Jul 21, 1998
• Expiry date: Dec 10, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/581
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

When measuring speed over ground by means of microwave Doppler radar, signal noise, switching spikes and nearby reflectors reduce the measurement accuracy. In order to avoid these disadvantages, a reference signal which recurs with the period T.sub.0 and a target signal which follows the reference signal after a time interval T.sub.s are emitted via an antenna. That part of the reference signal which has already been received again during transmission of the target signal is subtracted from the target signal which is received later. The difference signal obtained in this way is a measurement signal from which interference spikes, signal noise and nearby reflectors have been largely removed.