Abstract
The peculiarity of bioradar location is that the observed objects, as a rule, make not rectilinear, but reciprocating movements (human heart and chest). Obtaining the correct monitoring results is also complicated by the fact that the observation is performed against the background of the reflection of the radar signal from the objects surrounding the observed object. In fact, the probe signal is reflected not only from the chest of the person and the patient, but also from the stationary objects around and introduces an error in the calculation of the motion parameters of the examined object. If the radar is used in the presence of many local objects, then reflections from them also get into the receiver. Since the signals reflected from several objects interfere, the position of these objects is not identified. The presence of reflections from local objects (MO) leads to the appearance of a large constant component (PS) in the reflected signal, which is not possible to distinguish from a useful PS. Thus, the remote determination of the parameters of the heartbeat and respiration of a person can be solved provided that a sufficiently sensitive radar sensor is created, as well as the development of a software and hardware complex for non-contact radar monitoring of the motion parameters of biological structures and the development of filtering algorithms for background reflections that can mask a useful signal. The presence of background reflections may be associated with the registration of signals, which are reflected from the operator or other people who are in the measurement area. All this requires the creation of such hardware and software that would ensure reliable, error-free operation of the bio-radar equipment even under external interference. The problem is solved in that the body part is remotely irradiated with high frequency electromagnetic waves by a phase locator. The registration of tissue movements of body parts due to the combined effect of heartbeat and breathing is performed using a useful signal obtained by filtering low-frequency components, as well as decomposing the signal into quadrature components and recording changes in the signal phase.
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