EXPERIMENTAL STUDY OF IN-DOOR MM-WAVE IMAGING RESOLUTION

The problem of localization and reconstruction of unknown targets from measurements of the scattered field is important for designing mm-wave imaging systems. One of the limita-tions preventing realization of high quality images is a low spatial resolution. This paper discusses the experimental stud-ies concerning a nature of in-door spatial resolution limits. A critical point here is a determination of optimal distance be-tween targets and receiver in terms of near-far fields conditions and polarization impacts. Low S/N ratio direct detection experimental setup based on a W-band full- waveguide bandwidth of 75-110 GHz. has been designed and assembled to be employed in the experiments. Transmitting and receiving horn antennas (gain 25 dB and beam width 10 deg.) were used in experiments. High-speed pin-modulator driven specially designed driver stabilized by SAW resonator was employed for AM modulation of illumi-nated signal. The synchronized detector equipped with highly selective SAW-filter and low noise video amplifier have per-mitted to improve both the system S/N ratio and sensitivity resulting in a considerable reduction of RF illumination power. 1