Bio-radiolocation is a technology[1] for remote detection and diagnostics of biological objects by means of radar,[2] even behind optically opaque obstacles.
This technology is based on the reflected signal modulation caused by movements of the human body and internal organs.
[5] The amplitude of thorax surface displacement caused by respiratory muscles contractions is about 1 cm, while the same parameter for heart beating is only 1 mm.
[13] At present, commercially available bio-radars are aimed at the detection of people and at tracking them behind buildings or other obstacles (e.g. during antiterrorist operations[14][15]).
[16] However, such devices have not found widespread application in disaster rescue operations due to fundamental limitations of the method related to noises and background reflections.