In practical situations such as hostage rescue. earthquake and other similar events. the ultra-wideband (UWB) life-detection radar echo response from the respiration motion of the trapped person is always quasi-/non-periodic in respiration frequency or very weak in respiration amplitude. which can be called quasi-static vital sign. https://www.diegojavierfares.com/mega-super-Custom-Moulded-Cargo-Boot-Liner-Suits-Citroen-Grand-C4-Picasso-9-2006-On-Wagon-EXP-CARCRN00026-best-super/