Abstract
A mathematical model illustrating the method for masking regular oscillations in a transmitter is considered. The method is based on mixing these oscillations with chaotic motions formed from pulse chaotic oscillations with the use of the delay effect. Separation of the transmitted signal in a subtractor is also based on the delay effect. Results of numerical analysis are presented. It is shown that the proposed method of transmission and separation of the useful signal provides for the application of developed chaotic oscillations for masking. Transmission of a masked regular signal is experimentally demonstrated in the decimeter wavelength range. Transistor-coupled oscillators with chaotic dynamics are used for generation of noise-like oscillations. Results of experimental studies on formation of continuous noise-like oscillations from pulse noise on the basis of the delay effect are presented for the case when one of the two series of pulses contains the transmitted regular signal. Oscillation filtering is used along with the delay effect for separation of useful oscillations.
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Original Russian Text © E.V. Kalyanov, B.E. Kyarginskii, 2010, published in Radiotekhnika i Elektronika, 2010, Vol. 55, No. 9, pp. 1085–1091.
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Kalyanov, E.V., Kyarginskii, B.E. Hidden information transmission with the use of the delay effect for formation of a masking signal and separation of transmitted oscillations from this signal. J. Commun. Technol. Electron. 55, 1017–1023 (2010). https://doi.org/10.1134/S106422691009007X
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DOI: https://doi.org/10.1134/S106422691009007X