I.V. Chebotar − Dr.Sc. (Eng.), 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics E-mail:cvviur6@mil.ru

A.S. Bosyy – Ph.D. (Eng.), 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

M.T. Baldytchev – Ph.D. (Eng.), 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

I.G. Pivkin − Adjunct,

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics E-mail: cvviur6@mil.ru

At present, the development of satellite communication systems (SCS) involves the development of complex signals enabling the efficient use of time-frequency resource, in particular time-division multiple access (TDMA) technology. In addition, Software-defined radio (SDR) systems are popularized and distributed, allowing non-authorized use of the time-frequency resource of the repeater spacecraft, which in turn leads to a decrease in the quality of operation of the SDS. Promising directions of counteracting unauthorized use of frequency-time resource of KA-repeater are methods aimed at solving two main tasks: location of subscriber terminals (AT) and analysis of service and semantic parts of transmitted message. In the absence of access to the switching and address parameters, the separation of ATS is a little learned and rather relevant task. In connection with this, the article explores the influence of the communication channel on the change of non-energy parameters of the group signal CCS with TDMA in the task of its decomposition, in conditions of lack of access to switching-address parameters. Simulation model of group radio signal of SSS with TDMA is developed, which allows to investigate influence of communication channel on non-energy parameters of signals of individual ATS. To confirm the adequacy of the model, a technical analysis of the radio signal of standard MILL-STD-188-183 was carried out. Potential accuracy of delay estimation and Doppler frequency offset is calculated taking into account spectrum width ∆f = 9600 Hz and accumulation interval T = 0.025 seconds. Based on the described parameters, the dependence of potential accuracy on the noise signal ratio is calculated. According to the results of imitation simulation of group signal of SDMS with TDMA under condition of different removal of two ATS under conditions of noise influence, it is established that in order to solve problems of group signal decomposition on the basis of analysis of considered non-energy parameters at geographical removal of ATS by distance of 300 km, the lowest signal-to-noise ratio of ATS signals must be not less than 20 dB. Analysis of the considered non-energy parameters of the group radio signal of the MCS with TDMA can be used as a basis in development of decomposition methods aimed at determining the ownership of a time sending to a signal of a separate subscriber terminal, in conditions of lack of access to switching-address parameters of messages under conditions of signal quality and removal of subscriber terminals relative to each other. In practice, this will increase the efficiency of counteracting unauthorized use of the time-frequency resource of KA repeaters and improve the quality of their functioning.

1. Semenov K.V., Eremeev I.Yu. Osobennosti organizatsii sputnikovykh setei svyazi sprimeneniem tekhnologii mhogochastotnogo dostupa s vremennyum razdeleniem kanalov. Naukoemkie tekhnologii. 2010. № 9. S. 36−43 (In Russian).
2. Ob utverzhdenii osuschestvlenii radiokontrolya v Rossiiskoi Federatsii: Postanovlenie Pravitel′stva RF №175 от 1.04.2005.  URL: https://www.roscomos.ru/22347 (data obrascheniya: 10.02.20) (In Russian).
3. Tsyuganov A.S., Staritsyun S.S. Model′ formirovahiya kadrovoi strukturyu i informativnyui priznak dlya otsenivanita perioda kadra gruppovyukh signalov s mnogochastotnyum mnozhestvennyum dostupom s vremennyum razdeleniem. Telekommunikatsii. 2017.  Vyp. 4/17. S. 2–8 (In Russian).
4. Rekomendatsiya МСЭ-R P/1057-2 (In Russian).
5. Sklyar B. Tsifrovaya svyaz′. Teoreticheskie osnovy i prakticheskoe primenenie. Izd. 2-е: Per. с angl. M.: OOO «I.D. Vil′yams». 2017. 1100 s. (In Russian).
6. Kamenev V.E., Cherkasov V.V., Chechin G.V. Sputnikovye seti svyazi. М. 2004. 536 s. (In Russian).
7. Kantor L.Ya., Timofeev V.V. Sputnikovaya svyaz′ i problema geostatsionarnoi orbity. М.: Radio i svyaz′. 1988. 168 s. (In Russian).
8. Vlasov S.A., Mamon P.A. Teoriya poleta kosmicheskikh apparatov: Ucheb. posobie. SPb: VKA. 2007. 435 s. (In Russian).
9. Eskobal P. Metody opredeleniya orbit: Per. s angl. Pod red. V.G. Demina. М.: Mir. 1970. 472 s. (In Russian).
10. Krasyuk N.P., Koblov V.L., Krasnyuk V.N. Vliyanie troposfery i и podstilayutschei poverkhnosti ha raboty RLS. М.: Radio i svyaz′. 1988. 216 s. (In Russian).
11. Bin B.R., Datton E.Dzh. Radiometeorologiya. L.: Gidrometizdat. 1971. 363 s. (In Russian).
12. Eremeev I.Yu, Ovcharenko K.L. Metod vychislitel′no-effektivnogo otsenivaniya vzaimnykh vremennykh zaderzhek v usloviyakh apriornoi neopredelennosti chastotnyukh sdvigov signalov sputnikovyukh terminalov. Trydyu Voenno-kosmicheskoi akademii imeni A.F. Mozhaiskogo. 2016. № 651. S. 98–105 (In Russian).
13. Zamarin A.I., Eremeev I.Yu., Ovcharenko K.L. Sravnitelnyui analiz podkhodov k otsenivaniyu zaderzhki signalov v usloviyuakh apriornoi neopredelennosti vzaimnogo chastotnogo sdviga. Estestvennyue i tekhnicheskie nauki. 2017. № 2. S. 126–130 (In Russian).
14. Ovcharenko K.L. Potentsial′naya tochnost′ otsenivaniya zaderzhki signalov pri nalichii chastotnogo rassoglasivaniya na osnove vyuchisleniya vzaimnoi korrelyatsionnoi funktsii modifitsirovannyukh kompleksnyukh ogibayutschikh. Uspekhi sovremennoi radioelektroniki. 2017. № 7. S. 39–44 (In Russian).
15. Gubin V.A., Klyuev V.A., Kostyulev A.A. Osnovy radionavigatsionnyukh izmerenii. Pod red. N.F. Klyueva. MO SSSR. 1987. 429 s.  (In Russian).