Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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INCREASE OF INTERFERENCE IMMUNITY OF NARROW-BAND CHANNELS OF THE RADIO SERVICE ON THE BASIS OF APPLICATION OF SIGNALS WITH INTRAIMPULSE FREQUENCY MODULATION

Ananjev A.V. 1 Bezuglov D.A. 2 Juchnov V.I. 2
1 Military educational center of science Military - Air Forces «Military - Air Academy of professor N.E.Zhukovsky and JU.A.Gagarin»
2 Rostov institute of technology of service and tourism (branch) of Federal public budgetary educational institution of the higher professional education «Southern Russian state university of economy and service»
Now still there is an interest to narrow-band communication systems, including the short-wave band, therefore the urgency of increase of their quality of operation does not cause doubts. Various methods of increase of interference immunity are known, of which it is necessary to carry depositing of redundancy in a spectrum of the transmittable message to one. One of variants of the extension of a spectrum is transmission of the discrete messages by signals with the linear frequency intraimpulse modulation. However restrictions existing simultaneously on width of the channel and minimum transmission rate do not allow to apply signals with time-bandwidth product more than 10. At the same time optimal handling of such signals gives the big level of side bursts of compressed signals (sidelobes) struggle with which consists in increase of a threshold of actuating of processing devices of information sequences that practically eliminates a scoring in the relation a signal-to-noise ratio at usage of signals with small bases. Known methods of lowering of level of coma lobes appear insufficiently effective or is unjustified resource-demanding. Therefore in scientific publication development of methods of formation and signal processing with intraimpulse non-linear frequency modulation for the narrow-band channels of a radio communication implementing as a whole a method of lowering of level of sidelobes of compressed signals, providing essential approach to the potential interference immunity reached at the expense of application of methods of the extension of a spectrum is carried out.