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148 research outcomes, page 3 of 15
  • publication . Article . 2018
    Open Access Russian
    Authors:
    D. S. Borovitsky; A. E. Zhesterev; V. P. Ipatov; R. M. Mamchur;
    Persistent Identifiers
    Publisher: Saint Petersburg Electrotechnical University "LETI"

    <jats:p>Satellite altimeters play a key role in Earth remote sensing programs. To attain a centimeter accuracy level within the limited energy budget the altimeter probing signal should have a processing gain of the order of tens of thousands. Un-der such circumstances ...

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  • publication . Article . 2018
    Open Access Russian
    Authors:
    Natalya A. Obukhova; Alexander A. Motyko; Alexander A. Pozdeev;
    Persistent Identifiers
    Publisher: Saint Petersburg Electrotechnical University "LETI"

    <jats:p>The purpose of this research is to create new automatic methods for endoscopic image digital processing, ensuring their high ergonomics and the possibility of effective use in clinical decision support systems. As the result of investigation, the following metho...

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  • publication . Article . 2018
    Open Access
    Authors:
    A. G. Deripaska; M. V. Soklakova; E. P. Chernyshev;
    Persistent Identifiers
    Publisher: St. Petersburg Electrotechnical University LETI

    This article is devoted to the  development of analytically  described self-oscillation  stability  research  technique.  The case when  the  linear part  of the  system contains transfer function with a zero pole is considered. Typically the transfer function study,  w...

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  • publication . Article . 2018
    Open Access
    Authors:
    Svyatoslav V. Ballandovich; Grigory A. Kostikov; Yury Antonov; Liubov M. Liubina;
    Persistent Identifiers
    Publisher: St. Petersburg Electrotechnical University LETI

    <jats:p>The ring-slot-element cell for reflectarray antennas is investigated. The mathematical model of the unit cell is based on the integral equation that is solved by the moment method with the use of the spectral domain Green’s function. Coaxial-line higher modes ex...

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  • publication . Article . 2018
    Open Access Russian
    Authors:
    M. L. Maslakov; M. S. Smal;
    Persistent Identifiers
    Publisher: Saint Petersburg Electrotechnical University "LETI"

    The possibilities  of increasing  the data  rate of adaptive HF communication systems by reducing  redundancy in the  form  of test  signals  used  for its operation are  considered. The problem is currently  pressing  due  to increasing  demands of modern adaptive data...

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  • publication . Article . 2018
    Open Access Russian
    Authors:
    Aleksey S. Marugin; Vladimir K. Orlov; Rumiya R. Khaziakhmetova;
    Persistent Identifiers
    Publisher: Saint Petersburg Electrotechnical University "LETI"

    <jats:p>The study object is the search procedure for a ground-based radionavigation system signal using noise-like discrete signals with a long baseline. A comparative analysis of the signal search quality indicators is carried out, which is the most time-consuming proc...

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  • publication . Article . 2018
    Open Access
    Authors:
    A. A. Golovkov; E. I. Mozhaeva;
    Persistent Identifiers
    Publisher: St. Petersburg Electrotechnical University LETI

    <jats:p>The limiting characteristics of electrically small-sized loop antenna matching by means of non-Foster's negative inductance are studied. Various options for including negative inductance in frame antenna structure are considered. The analytical limit expression ...

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  • publication . Article . 2018
    Open Access
    Authors:
    D. S. Borovitsky; A. E. Zhesterev; V. P. Ipatov; R. M. Mamchur;
    Persistent Identifiers
    Publisher: St. Petersburg Electrotechnical University LETI

    This paper  provides  a study  of robust  TOA discriminators used  in ground-based retracking  of a space-based altimeter da-ta. Requirements to an on-board TOA tracking loop are limited  to reliable locking of received echo-signal  within the tracking  window,  while f...

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  • publication . Article . Other literature type . 2018
    Open Access Russian
    Authors:
    Ivan S. Pesterev; Boris G. Stepanov;
    Persistent Identifiers
    Publisher: Saint Petersburg Electrotechnical University "LETI"

    <jats:p>The results of experimental research of models of antennas hydroacoustic system (HAS), containing transducers of the waveguide type (TWT), which represent a coaxial set of identical water-filled piezocylinders, electrically excited by the principle of a travelin...

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  • publication . Article . 2018
    Open Access
    Authors:
    N. A. Cheplagin; G. A. Zaretskaya; B. A. Kalinikos;
    Persistent Identifiers
    Publisher: St. Petersburg Electrotechnical University LETI

    <jats:p>A method for analysis of dispersion characteristics of guided optical modes propagating in the optical waveguides with small cross-sections is proposed. The method is based on introduction of a correction factor for a longitudinal wavenumber of propagating modes...

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148 research outcomes, page 3 of 15