Radar distance sensor

US6181273A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Jul 12, 1999
• Grant date: Jan 30, 2001
• Expiry date: Jul 12, 2019

Classification

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

Abstract

Microwave radar: an additional modulation of the microwave signal (s (t)) provided for the emission or of the reception signal (e (t)) makes it possible to separate the payload signal from the noise signal parts in a following demodulation and filter unit (HP, MI2, TP). To this end, a modulation unit (MO, RG) for suitably modulating the signal to be emitted is provided preceding the antenna (A). The undesired noise signals produced by the components of the radar sensor itself are not modulated and can therefore be separated from the payload signal by filtering. This separation ensues after a raw measured signal (mess' (t)) has been generated by mixing transmission and reception signal (MI). A renewed demodulation with the modulation signal (r t)) of the modulation unit supplies the final measured signal (mess2 (t)) determinant for the determination of the distance, whereby the noise signals are previously removed by high-pass filtering and/or are subsequently removed by low-pass filtering.