So far, the Cougar20-H surveillance robot was the only robotic system, which could sense and identify human breathing.
Phoenix40-A takes to the skies after casing a building
However TiaLinx, a company based in Newport Beach in California, has introduced a new flying version called the Phoenix40-A, which is a mini UAV, including six rotors to detect both breathing and motion when trying to search for people who are hiding. Similar to the Cougar20-H, it includes an ultra wideband radio frequency sensor array, which can detect still and motionless live objects. Site surveillance is carried out by its video cameras.
This Phoenix unmanned vehicle was developed with funding given by the U.S. Army and can be controlled by a remote from either air or ground with a joystick or a laptop. During its mission, it can fly to multi GPS points. According to TiaLinx, the RF array in the flying robot can pierce concrete walls from an extended range.
Moreover, it could show the layout or plan of a multistory building and also scan roads for unexploded arms. It can also be used in humanitarian missions such as scanning for survivors in disasters such as earthquakes or identify landmines in places, which were war zones in the past.
Source: http://www.tialinx.com/phoenixfamily.html