Sensor system

US6255984A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Bernhard Kreppold · Munich, DE
• Martin Vossiek · Ergolding, DE
• Patric Heide · Vaterstetten, DE

Key dates

• Filing date: Aug 30, 1999
• Grant date: Jul 3, 2001
• Expiry date: Aug 30, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/34
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

FMCW doppler radar, in which a reference signal is generated from the transmit signal via a delay line and a mixer. A measuring signal which is received and mixed with the transmit signal is detected and digitized at the times of the zero crossings of the reference signal. In this way, the measuring signal can be evaluated at time intervals of equal phase of the reference signal. A downstream algorithm enables the generation of a strictly linearly frequency-modulated transmit signal. With this mechanism, phase errors of conventional radar systems are eliminated.