Blind separation of several biological objects respiration patterns by means of a step-frequency continuous-wave bioradar

This paper presents experimental results to support a new method for blind source separation of several biological objects respiration patterns, which were registered remotely by means of a step-frequency continuous-wave bioradar. The method utilizes independent component analysis. Signals registered by a single bioradar at several probing frequencies are used as input data for independent component analysis as they represents the mixtures of the respiration patterns of all observed biological objects. Two experiments with two and three examinees simultaneously observed were carried out. The experimental results proved that even in case of biological objects located at the same distance from the radar their respiration patterns can be resolved from the signal recorded by a single multi-frequency bioradar.