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Telecommunications and Radio Engineering

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v68.i9.30
pages 779-788

Doppler Spectra of Human Breathing and Stochastic Models for their Description

O. V. Sytnik
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
I. A. Vyazmitinov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
Ye. I. Myroshnychenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine

ABSTRACT

This paper describes the results from experimental studies on the coherent Doppler radar signals echoed from a human being. Spectral and temporal realizations of informational processes and their statistical characteristics are presented. It is shown that in the microwave-band sounding signal the process generated by the echo-signal phase modulation caused by human breathing has the properties of periodically correlated random process. The statistical characteristics of this process are calculated on an equidistant grating, the period of which is equal to that of process correlation. A stochastic criterion is proposed to estimate the correlation period. The ergodicity property of the process on an equidistant grating has been theoretically proved and experimentally confirmed.