Small displacement detecting method based on multifrequency continuous wave radar system

Abstract

A small displacement becomes important indicator in identifying a problem that may rises in several systems. Non-Contacting sensor is needed for small displacement detection in several field such as structure health monitoring, landslide monitoring and human vital sign detection. Radar system is potentially implemented as non-contacting sensor for previous mention problems. Detection of small displacement on a target using a radar system requires high accuracy and resolution which gives the consequence of a wide bandwidth requirement. The method of multi-frequency continuous wave radar is then investigated and proposed as a method for detection of small displacement with low bandwidth requirements. Cross correlation and IQ demodulation techniques are applied in post processing. Theoretical analysis and simulation were conducted to study the concept of the proposed method. The results show that the proposed method can determine the location and magnitude of small displacement.