Категория: Aviation radio communication, radiolocation, radio navigation and methods of their operation

The influence of quasi-sinusoidal inhomogenuities on the characteristics of double- and three-hop ionospheric reflections

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UDC: 621.371.33 BBK 39.57

A.I. Agaryshev

Nguyen Minh Giang

M.A. Portnov

The article presents the results of researching the influence of ionosperic inhomogenuities on the maximum observed frequency (MOF) and the angles of arriving the radiowaves reflected two and three times from the ionosphere (2F2 and 3F2 modes). The authors present the calculated МOF and angles of arrival of decameter radio waves using the method of equal MUF under conditions of quasi-sinusoidal inhomogenuities. The results of calculations are compared with the results of measurements.

Keywords: maximum usable frequency, maximum observed frequency, inhomogeneity of the electron concentration, characteristics of double- and three-hop ionospheric reflections,  the angles of arrival of 2F2, 3F2 modes.

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Signal demodulation for the secondary radar channel of ADS–B system

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UDC 621.396.74 BBK 39.571.5

Lezhankin B. V., Mezhetov M. A., Turincev S. V.

Aircraft flight safety is largely dependent on the performance of systems having various purposes. One of the systems is ADS-B intended for air traffic management by constructing trajectories of aircraft motion with efficient use of airspace. The analysis of main methods of designing the equipment, demodulating and decoding the signals in data links is therefore a relevant objective which can increase the efficiency of air transportation at the required level of flight safety.   

Key words: ADS-B, systems of symbol synchronization, quadrature demodulator, quadrature signal, hardware-software receiver, preamble detector.

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Hardware-software simulator for primary radar signals of the control radar

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UDC 621.396.96 BBK 32.842

Hmarskij P. A., Rodriguez D., Solovov A. I.

The article focuses on the principles of construction of the developed hardware-software simulator for primary radar signals of the control radar. The use of the proposed hardware simulator within a dispatching radar will significantly improve its competitiveness due to the possibility of realization of the modes of research and implementation of existing and future algorithms for radar information processing.

Keywords: control radar, hardware and software system, the generator of trajectories, noise shaper, designer of radar objects.

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Filtering of optical signals based on multi-layered structures

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UDC 621.372 BBK 39.56

Polyakov D. O.

The article discusses synthesis of optimal filters for random spatial signals based on multi-layer optical structures running in the corner filtering mode.

Key words: corner filtering; synthesis; optical structure.

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Development of mathematical model of input action for the device support of the radiation source according to the movable radio finder

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UDC 621.396.96 BBK 32.842

Hmarskij P. A., Sushhinskij A. A.

The authors present the methodology of development of input action mathematical model  for the device support of the radiation source according to the movable radio finder.

Key words:  movable radio finder; accompanied only by angular coordinates; model of input action; model of specifying impact; random discrete maneuver; the Kalman filter.

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Extraction of run-up signals in systems of information communication in VDL-2 mode

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UDC 621.396.74 BBK 39.571.5

Mezhetov M. A., Turincev S. V.

Air-to-air and air-to-ground automated data exchange systems are increasingly common. Automated data exchange (ADE) in such systems is conducted in VHF band with the use of VDL-2 или VDL-4 modes. The design of ADE receivers implies a clock sync (CS) circuit in their composition which can be constructed differently. A run-up signal in such systems is extracted digitally.  One of the factors influencing the quality if received information in VDL-2 systems is selection of a technique of run-up signal regeneration.  

The article considers a technique of run-up signal regeneration with use of front reconstruction which is implemented in a hardware-software receiver developed by the authors. Research of CS regeneration principles will enable to conduct a comparative analysis of different techniques of extracting and forming a run-up signal and to apply the hardware-software receiver for further research.

Key words: VDL-2, clock sync systems, Gardner detector, scrambler, quadrature components, hardware-software receiver.

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Stages of formation and development of aeronautical radionavigation scientific school of MSTU CA, Irkutsk branch

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UDC 621.391:621.396 BBK 39.57-5

Lezhankin B. V.

The article analyzes the stages of formation and development of aeronautical radio-navigation scientific school of MSTU CA, Irkutsk Branch. The main scientific approaches are described. The article reviews the main scientific staff publications.  It demonstrates the research intergenerational continuity, development of the methodology and scientific and experimental facilities.

Keywords: scientific school, radionavigation, interaircraft navigation, satellite navigation.

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Precision of the secondary processing algorithm of navigation signals of the global navigation satellite system based on rho-rho navigation-doppler extended Kalman filter

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UDC 621.396.98 BBK 39.57-5

Kiryushkin V. V., Suprunov A. V.

The authors conduct a research of the error dynamics of the algorithm of the secondary processing of navigation signals of the global navigation satellite system based on extended Kalman filter. The article shows that at the stages of intense maneuvering the accuracy of a certain positioning of a highly dynamic consumer increases to 1.5 times. Presumably the reason for this is the mismatch of the dynamic model of the object, embedded in the optimal linear filter and real dynamics of users’ movements.

Key words: global navigation satellite system, highly fluid consumer, extended Kalman filter, measurement error of coordinates.

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Concerning a new possibility of increasing the positioning accuracy in single-frequency equipment of satellite radio navigation systems

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UDC 004:[316.3:008] BBK 74.58:73

Gorbachev O. A., Zatolokin D. A., Ivanov V. B., Kholmogorov A. A.

The problem of increasing the positioning accuracy of global navigation satellite systems is one of the most important problems of navigation. One of the most inexpensive ways to solve the problem is the time-differential mode of GNSS proposed by the authors earlier. The article focuses on modernization of the time-differential mode for satellite radio navigation systems (SRNS) operating in a single-frequency mode.

Keywords: navigation problem; single-frequency receiver; antenna phase center; differential mode; control and correction station; pseudorange.

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