V.К. Khokhlov - Dr.Sc. (Eng.), Professor, Bauman Moscow State Technical University. E-mail: valerykhokhlov@mail.ru А.К. Likhoedenko - Laboratory Assistant, Bauman Moscow State Technical University; Student, Moscow Institute of Electronics and Mathematics of National Research University Higher School of Economics. E-mail: kost21v@rambler.ru

This paper deals with the issues of formation directional diagram (DD) and discriminative features (DF) of two-channel direction finders localized sources of broadband radiation on the background distributed in space interference based on spectral method of signal processing. The finders with dual space diversity antennas are addressed. Based on the method of canonical expansions, the representation of input signals in the channels of the direction finder in the complex form, the expressions for in-phase and quadrature discrete mutual spectrum signals, the mutual argument of the spectrum and the coherence function are obtained. Obtained characteristics are analyzed for Gaussian spectra of signals and interference at different signal-to-noise ratios. Under the assumption of stationarity of signals at the inputs of the finder on a limited observation interval the assessment of the argument of mutual spectral density is justified on the basis of discrete Fourier transform for frequency multiples. With a wide band of input signals, the ratio of the direction finder database to wavelengths corresponding to selected frequencies are obtained, which are necessary for the synthesis of a phased array antenna (PAA). The expressions for DD synthesized phased array antenna are justified, allowing the scanning direction of the main peak days. A modified discriminator is considered, its DD is obtained on the basis of in-phase and quadrature baseband signals in the channels of the direction finder. In this paper the mathematical dependence of potential DD and DF of two-channel direction finders with synthesized PAA based on the spectral method of processing the signals from the ratio of distances between phase centers of receiving antennas to the average wavelength corresponding to the average frequency in the energy spectrum of the received signals, the relative bandwidth of the energy spectra of the signals at the input of the direction finder and the signal-to-noise ratio. For various signal parameters DD and DF are calculated and plotted. It is shown that applying the proposed algorithm of signal processing in the synthesized PAA allows to suppress side lobes in the DD. Reviewed PAA can be applied for localization and tracking of localized objects broadband radiation on the background distributed in space interference.

 

1. Luo R.C., Huang C.H., Huang C.Y. Search and track power charge docking station based on sound source for autonomous mobile robot applications // Intelligent Robots and Systems (IROS). 2010 IEEE/RSJ International Conference on Digital Object Identifier: 10.1109/IROS.2010.5649993 Publication Year: 2010. P. 1347-1352.
2. Xiaofei Li, Hong Liu Sound Source Localization for HRI Using FOC-Based Time Difference Feature and Spatial Grid Matching // IEEE Transactions - Digital Object Identifier: 10.1109/TSMCB.2012.2226443. 2013. V. 43, № 4. P. 1199-1212.
3. Verron C., Gauthier P.-A., Langlois J., Guastavino C. Spectral and Spatial Multichannel Analysis/Synthesis of Interior Aircraft Sounds // IEEE Transactions - Digital Object Identifier: 10.1109/TASL.2013.2248712. 2013. V. 21, № 7. P. 1317-1329.
4. Sorochan A.G. Correlation direction finder with two OMNI-directional antennas // 23rd International Crimean Conference Microwave and Telecommunication Technology (CriMiCo). 2013. P. 298-299.
5. Lekhovytskiy D.I., Shifrin Y.S., Atamanskiy D.V. Rapidly convergent «superresolving» direction finders of noise radiation sources in adaptive arrays // IX International Conference Antenna Theory and Techniques (ICATT). Digital Object Identifier: 10.1109/ICATT.2013.6650679. 2013. P. 28-33.
6. Pokrajac I.P., Okiljevic P., Vucic D. Development of direction-finder for VHF/UHF frequency band // 19th Telecommunications Forum (TELFOR). Digital Object Identifier: 10.1109/TELFOR.2011.6143662. 2011. P. 786-789.
7. KHokhlov V.K., Korshikova ZH.S. Pelengacija lokalizovannogo istochnika akusticheskikh izluchenijj na osnove znakovogo korreljacionnogo metoda // Vestnik MGTU im.N.EH. Baumana. Ser. Mashinostroenie. 2008. № 3. S. 66-74.
8. KHokhlov V.K., Likhoedenko A.K. Funkcii napravlennosti i diskriminacionnye kharakteristiki pelengatorov lokalizovannykh obektov na osnove radiolokatora so sverkhkorotkimi impulsami // Naukoemkie tekhnologii. 2015. T. 16. № 7. S. 36-42.
9. Astapov JU.M., Kozlov V.I., Soboleva N.S., KHokhlov V.K. Avtonomnye informacionnye i upravljajushhie sistemy: Trudy kafedry «Avtonomnye informacionnye i upravljajushhie sistemy» MGTU im. N.EH. Baumana. V 4 t. T.1 / Pod red. A.B. Borzova. M.: OOO NIC «Inzhener», OOO «Oniko-M». 2011.
10. Bendat Dzh., Pirsol A. Prikladnojj analiz sluchajjnykh dannykh: Per. s angl. M.: Mir. 1989.
11. Korostelev A.A. Prostranstvenno-vremennaja teorija radiosistem: Ucheb. posobie dlja vuzov. M.: Radio i svjaz. 1987.