Estimation of the structure of the spectrum of broadband non-like LFM FM and PS LFM signals

Author(s):  S.P. Belov, Dr., Prof., Belgorod University of Cooperation, Economics and Law, Belgorod, Russia,

E.G. Zhylyakov, Dr., Prof., Belgorod National Research University, Belgorod, Russia,

S.A. Rachinsky, Belgorod National Research University, Belgorod, Russia,

Issue:  Volume 46, № 2

Rubric:  Infocommunication technologies

Annotation:  Currently, one of the important components of ensuring the national interests of Russia in the Arctic is the improvement of radio communication systems based on the use of promising methods for minimizing the costs of frequency-time resources of existing channels and, first of all, satellite system channels, as the primary means of ensuring information interaction with territorial features of the distribution of subscribers in the region. The use of narrow-band signals with high spectral efficiency for these purposes, which have found wide application in stationary communication systems, in the Arctic latitudes is impractical, because in these latitudes information exchange using satellite communication systems is provided via a satellite repeater in a highly elliptical orbit, which causes the occurrence of the Doppler effect, and as a result, the mismatch of the received narrowband signals in frequency and delay. This leads to an increase in the level of mutual interference and the cost of the frequency-time resources of the communication channel. Given this fact, the article analyzes the detailed assessment of the frequency properties of complex broadband LFM FM and PS LFM signals, which are highly resistant to Doppler frequency mismatch. The results of the studies described in the work showed that the organization of information exchange using these signals as carriers of information not only provides resistance to Doppler frequency error, but also efficient use of allocated frequency resources of a satellite communication channel.

Keywords:  time-frequency resources of satellite communication channels, time-frequency characteristics of signals, Doppler effect.

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