Separation of Two Close Targets in CW-Radar Measurement in the Example of Respiration Monitoring

A CW-radar is able to determine the movement of a monitored target, if the radar faces two, or more, targets their reflected waves superimpose each other additive. If two targets have an equal backscatter factor and similar movements their caused signals become so similar that they are barely distinguishable. However, these are still two separately generated signals hence they must be separable in some way. In this paper is an analytical approach to reconstruct both signal elaborated and evaluated. Fundamental radar equations and complex trigonometric relations provide the pivotal mathematical basis for the approach. As a practical usage of the described phenomena is the monitoring of chest and abdomen, in order to track the respiration, used to explain the main problem and as basic for the simulated signals.