Many studies have been developing RADAR for small displacement detection
including Synthetic Aperture RADAR (SAR) to detect the landslide, where a wide
bandwidth is commonly used. This thesis propose a small displacement detection
by using Continuous Wave (CW) RADAR. CW RADAR with its narrow bandwidth
feature, make system realization become more simple compared to the system using
a wide bandwidth.
CW RADAR can only detect the velocity of a dynamic target. Then, it underlie this thesis to modify the CW RADAR system by using dual frequency. This
dual frequency, helps the system to recognize the displacement of a static target by
processing its phase component on the echo signal.
This thesis performs a computer simulation by MATLAB and an experiment
by HB100 motion sensor. The computer simulation result shows that the proposed
RADAR is capable to detect a small displacement in milimeter scale. It simulated
-3.5625 mm until 3.5625 mm of displacement with three value of bandwidth. The
narrowest bandwidth that can be simulated is 0.3 MHz. In the experiment result,
the bandwidth is set to 0.87 MHz. Then, it needs some improvement in order to
make the result better.
Keywords: continuous wave (CW) RADAR, small displacement, phase shift.