Comparison of spread spectrum radar and impulse radar for through-wall imaging based on FDTD

A spread spectrum (SS) radar is compared with a conventional impulse radar for through wall imaging in this paper. In order to simulate the real electromagnetic environment, all the echoes are generated via modeling and simulation of the finite-different time-domain (FDTD) method. Results show that the SS radar has a great advantage over the impulse radar in some ways, such as targets recognition, engineering realization and immunity from interference. The targets can still be recognized accurately in the image, even when the receiving signals of SS radar are added with -0.83dB noise and sampled by a 2bit, 1 Gs/s analog-to-digital converter(ADC).