Comparison of Impulse Radar and Spread-Spectrum Radar in Through-Wall Imaging

Based on the impulse radar and the spread-spectrum (SS) radar, the through-wall imaging with three stationary targets or a moving target in a room are obtained, respectively, and compared in this paper. We then analyze the influences of different analog-to-digital converters (ADCs) and noise levels on imaging quality. Results show that the SS radar has a great advantage over the impulse radar in some ways, such as covert waveform, engineering realization, excellent anti-noise performance, and accurate tracking. Furthermore, the target localization accuracy is much easier to be affected by sampling frequencies of ADC. Besides, the stationary targets can still be recognized accurately in the image, even when one target is very close to the wall, and the receiving signals of the SS radar are added with 0-dB noise and sampled by a 4-bit 3-GHz ADC.