Experimental study and analysis of stepped-frequency continuous wave based radar for through the wall detection of life signs

This Stepped-frequency continuous wave (SFCW) radar system is used to detect the breathing signal of human being entrapped behind a plywood wall. For validation, a breathing physical model is developed and tested successfully. For breathing detection, information is extracted using Fast Fourier transform (FFT) and Hilbert Huang transform (HHT) methods. Experimental results show successful detection of breathing signal of human being as well as due to physical model using both methods.