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Relationship of Signal and Noise Characteristics of Autodynes with Frequency Modulation as Function of Distance to Location Object

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Abstract

The paper presents the results of analysis of signal and noise characteristics of autodynes with frequency modulation. The mathematical model of autodyne is presented in the form of a self-oscillator with single-loop oscillation system that is frequency-tuned using the varicap. This model takes into account the impact of intrinsic radiation reflected from location object and the impact of generator internal noises on the oscillator. The paper investigates the relationship of the distortion degree of signal characteristics and the periodic nonstationarity of the root-mean-square value of the level of frequency and amplitude noises as a function of the distance to the location object and the value of external feedback parameter of the autodyne “generator–location object” system. It has been shown that at a small value of the parameter of external feedback, the signal characteristics are quasi-harmonic similar to homodyne type systems, while noises represent a stationary random process. If the value of external feedback parameter is comparable to unity, anharmonic distortions are observed in signal characteristics, while the periodic nonstationarity is observed in noise characteristics. It was established that with an increase of distance to the location object, when the delay time of reflected radiation became comparable or larger than the period of autodyne response, the degree of anharmonic distortions of signal characteristics and the height of peaks of root-mean-square noise level were significantly reduced. The results of experimental investigations have been obtained using the prototype of autodyne sensor with frequency modulation built on the 8-mm band Gunn diode.

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Notes

  1. These characteristics determine the process of signal formation; therefore, they are generally called signal characteristics of autodynes.

  2. As can be seen from expressions (9) and (11), characteristics an(tn, τn)(s+ns) and un(tn, τn)(s+ns) do not have fundamental differences between themselves, therefore, in what follows we will consider the formation of signal and noise characteristics based only on autodyne changes of frequency and amplitude of generator oscillations.

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Authors and Affiliations

  1. Ural Federal University, Yekaterinburg, Russia

    V. Ya. Noskov, K. A. Ignatkov & K. D. Shaidurov

  2. O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine

    G. P. Ermak & A. S. Vasiliev

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  1. V. Ya. Noskov
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  2. G. P. Ermak
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  3. A. S. Vasiliev
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  4. K. A. Ignatkov
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  5. K. D. Shaidurov
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Correspondence to G. P. Ermak.

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ADDITIONAL INFORMATION

V. Ya. Noskov, G. P. Ermak, A. S. Vasiliev, K. A. Ignatkov, K. D. Shaidurov

The authors declare that they have no conflict of interest.

The initial version of this paper in Russian is published in the journal “Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika,” ISSN 2307-6011 (Online), ISSN 0021-3470 (Print) on the link http://radio.kpi.ua/article/view/S0021347021040051 with DOI: https://doi.org/10.20535/S0021347021040051

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika, No. 4, pp. 247-260, April, 2021 https://doi.org/10.20535/S0021347021040051 .

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Noskov, V.Y., Ermak, G.P., Vasiliev, A.S. et al. Relationship of Signal and Noise Characteristics of Autodynes with Frequency Modulation as Function of Distance to Location Object. Radioelectron.Commun.Syst. 64, 216–227 (2021). https://doi.org/10.3103/S0735272721040051

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  • DOI: https://doi.org/10.3103/S0735272721040051

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