Chaos-Based Through-Wall Life-Detection Radar

We propose a chaos-based through-wall life-detection radar utilizing a wideband Boolean-chaos signal as the radar probe signal. The range between the radar and the human target can be obtained by correlating the chaotic signal reflected from the human target with its delayed duplicate. Actually, this range is modulated periodically by human chest wall displacements along the time axis of recording signal and the modulation frequency is equal to the respiratory frequency. Therefore, we design a life-detection algorithm based on correlation method to extract the human’s respiratory frequency and range information from echo signals. Experimental results demonstrate that our radar can simultaneously detect the respiratory frequency and range of the human target behind a 20-cm-thick wall within the range of at least 5[Formula: see text]m. The dynamic range and range resolution can reach 35[Formula: see text]dB and 15[Formula: see text]cm, respectively. Furthermore, the excellent anti-interference performance of the proposed radar has also been demonstrated, which makes it especially suitable for search and rescue missions in complex electromagnetic environments.