T. Le-Tien (Vietnam)
Geometrical Theory of Diffraction, Wavelet Transform, Stepped-Frequency Radar, Scattering Center,Doppler Frequency, Radar Target Recognition, Antenna Measurement Station, Anechoic Chamber.
The paper presents a practical and theoretical analysis based
on the Wavelet transform and Geometrical Theory of
Diffraction (GTD) model for high resolution radar signal
processing. It focuses on the recognized target imaging
using the stepped-frequency technique for experimental
objects in electromagnetic microwaves. In the first
experimental system, the signals are generated by an
antenna measurement station using the Gunn oscillator with
microstrip antenna for the practical measurement. The
Wavelet and Fourier transforms are then applied to denoise
and analyze the Doppler frequencies of the returned signals
to estimate the speeds of a Helicopter model. The second
experimental system is presented for target recognizing by
combining GTD and Wavelets for stepped-frequency
signals generated from a Microwave tranceiver system.
The scattering centers revealed the shape of the investigated
model are successfully recognized for a flat rectangle
aluminum piece in the microwave laboratory of the
department. The practical measurements are carried out in
a reflection-free environment with an anechoic chamber.
All programs for signal analysis are written in MATLAB.