FMCW sensor

US6317075A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Patric Heide · Vaterstetten, DE
• Martin Nalezinski · Hersbruck, DE

Key dates

• Filing date: Feb 25, 2000
• Grant date: Nov 13, 2001
• Expiry date: Feb 25, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03D9/0658
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An FMCW sensor in which a transmission signal is generated from a high frequency of a fixed frequency oscillator and a modulated, low frequency of a second oscillator. The modulated frequency is processed in a delay line with a surface wave component to form a reference signal. A transmission mixer with a hybrid coupler having a 90.degree. phase difference and terminated by diodes is employed in a transmission/reception means. A measured signal from the transmission mixer together with the reference signal is interpreted in an evaluation means.