SDR-ТЕХНОЛОГІЇ ПРИХОВАНИХ ЛІНІЙ РАДІОЗВ'ЯЗКУ. SDR-THECHNOLOGIES OF ÑOVERT RADIO LINES
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Date
2019
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Abstract
The possibilities of Software Defined Radio (SDR) – technologies in the correlation processing of linear-frequency modulated (LFM) signals are examined. The structure of the correlation receiver of maximum likelihood is justified using modern SDR technologies. Since the signal arrival time is unknown after analog-to-digital conversion (ADC), the signals are fed to the correlation processing channels and to the maximum selection device, the signals from which are sent to the decision-making device. The decision maker evaluates the message that is transmitted if the signals exceed a certain detection threshold. The influence of the amplitude quantization of the signal on the detection process is analyzed, since with insufficient ADC bit depth, the signal is simply lost in the quantization noise. It is shown that the existing ADC bits allow processing signals with large bases, which makes it possible to use SDR technologies to create correlation receivers of chirp signals. The synthesis results are illustrated by simulations in the software environment Mathcad and Excel. For comparison, the simulation results are presented at the output of a conventional digital receiver, with a bandwidth that is equal to the band of the chirp signal. It is shown that to solve the analysis problem in the future, it is necessary to use the apparatus of two-component Markov processes, which allows one to find the distribution of the absolute maxima of random processes and sequences obtained by their discretization.
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густина потоку потужності шуму, оптимальний прийом сигналів, приймач максимальної правдоподібності, кореляційне оброблення, цифрове сигналів, noise power flux density, optimal signal reception, maximum likelihood receiver, correlation processing, digital signal processing