Radar Distance Measurement

Citation

Rigelsford, J. (2002), "Radar Distance Measurement", Sensor Review, Vol. 22 No. 3. https://doi.org/10.1108/sr.2002.08722cad.015

Radar Distance Measurement

Keywords: Sensors, Measurement, Distance measurement

Radar Distance Measurement

Applicant: J.S. O'Conner, GermanyPatent number: US6,232,911Publication date: 15 May 2001Title: Device for Distance Measurement by Radar

This patent presents a device for distance measurement by radar. The device comprises a frequency modulated radar transmitter and receiver by which a radar beam is directed onto an object to be measured and in which a beat signal is obtained by mixing the transmitted and the received frequency. By use of frequency modulation, the transmitted radar signal of the radar transmitter and receiver is periodically variable according to a saw tooth function. The frequency of the beat signal represents a measured value for the distance of the object and is dependent on the travel time of the radar signal reflected by the object. A signal processing circuit is used to generate a measured value of the distance from the obtained beat signal. This can be achieved by feeding the beat signal into a phase control circuit or phase locked loop circuit. The output frequency of the phase control circuit is then fed into the frequency voltage converter which supplies an output voltage which is proportional to the beat frequency and represents the measured value for the distance.