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

The research of the immunity of the multisystem GNSS reciever

DOI 10.51955/2312-1327_2023_2_

Roman O. Arefyev

Oleg N. Skrypnik

Muslim A. Mezhetov

Abstract. The article presents the results of a study of the noise immunity of the ATGM336H multi-system GNSS receiver to the influence of narrow-band interference at the L1 frequency set for one of the systems (GLONASS or GPS). The review of existing works on the study of noise immunity of satellite navigation receivers is carried out. The method of conducting experiments is presented. The simulator CH-3803M was used as a signal source from navigation satellites. The analysis of the results obtained during the experiments for the formulation of narrow-band interference of various capacities via GPS and GLONASS channels is carried out.

Keywords: GPS, GLONASS, dilution of precision, immunity.

Download article in PDF 879.4 kB

Confirmation of ADS-B messages by aircraft flight altitude

DOI 10.51955/2312-1327_2023_1_118

Alexander P. Plyasovskih

Evgeny A. Rubtsov

Andrey S. Kalintsev

Vladislav Y. Davidenko

Abstract. Proposed the method for confirming ADS-B data based on the analysis of information about the aircraft altitude and atmospheric parameters. To confirm the reliability of ADS-B messages, proposed to compare the geometric height obtained from satellite navigation system data with the height calculated for the real atmosphere (based on information from the meteorological service on pressure and temperature). To implement the proposed methodology, required the following input data: pressure at the level of the weather station, temperature at the level of the weather station and at flight altitudes, and data on geometric and barometric altitudes transmitted in the ADS message. It has been established that the greatest error in the calculations is introduced by the temperature at the aircraft flight altitude. In order to reduce the influence of errors in determining the temperature, proposed to use data from weather balloons. With developed methodology, a calculation was performed using real altitude data transmitted in the ADS-B message and the required data from the meteorological service. Messages received from the ADS-B ground station NS-1A manufactured by JSC VNIIRA, which is installed at the Mezen airfield, were used. The developed methodology is proposed to be used to confirm ADS-B data at regional aerodromes with low flight intensity.

Key words: ADS-B, weather balloon, barometric altitude, geometric altitude, pressure, temperature, Laplace formula, ISA.

Download article in PDF 496.5 kB

Use of LoRa modulation in radio communication, navigation and surveillance aids for performing air traffic control tasks

DOI 10.51955/2312-1327_2023_1_77

Muslim A. Mezhetov

Boris V. Lezhankin

Anna I. Tikhova

Ulyana S. Vakhrusheva 

Abstract. The paper considers the use of LoRa technology in the data transfer system for performing aircraft position-fixing by means of the network of multilateration ground stations. The urgency of the problem is that the methods used for transferring data do not meet the requirements for safety and security of the transmitted information so such systems are not protected against unauthorized access. The information transmitted is strategically important for performing air traffic management tasks on the territory of the Russian Federation. Unauthorized access can result in intercepting and spoofing the coordinate information of aircraft location. This is possible only in exceptional circumstances which lead to reduction in flight safety and transition of flight incidents to flight accidents. The security of transmitted information can be improved by applying noise-like signals which ensure better security indexes of transmitted signals and possess higher jamming resistance. A new LoRa technology of transferring data is widespread nowadays. The technology is based on the linear frequency modulation which has been used in radar systems for several decades.  The paper presents the algorithm of operating the multilateration data transfer system and its hardware-in-the-loop simulation implemented as a virtual device.

Key words: Linear frequency modulation, multilateration surveillance system, LoRa technology.

Download article in PDF 882.4 kB

Analytical study of the ionosphere influence on energy relations in satellite communication systems by the methods of physical plasma kinetics

DOI 10.51955/2312-1327_2023_1_98

Dmitry Vladimirovich Khazanov

Boris Valentinovich Lezhankin

Vyacheslav Vladimirovich Erokhin

Abstract. In civil aviation, an urgent and important task is to provide air traffic participants with uninterrupted radio communication. Satellite communication is a global mobile network covering the entire surface of the Earth, including polar regions, which provides a two-way data and voice communication exchange. An analysis of the principles of functioning of satellite communication systems (SCS) showed that the determination of energy characteristics is of great importance. Energy characteristics in satellite communication channels and the level of interference determine SCS operational capabilities and quality indicators. One of the critical factors that determine the effectiveness of the SCS functioning is the conditions for the propagation and absorption of radio waves, including ionospheric phenomena, which are not yet fully understood, and this determines the research relevance.

This article is devoted to theoretical studies of the ionospheric plasma by the methods of physical kinetics to increase the energy potential of the radio links of a satellite communication system.

Keywords: physical plasma kinetics, energy relations, satellite communication systems, Maxwell distribution function, ionospheric phenomena.

Download article in PDF 679.9 kB

On improving the efficiency of the training of engineering and technical personnel of radio equipment and radio communication services based on the method of computer emulation of radio equipment

DOI 10.51955/2312-1327_2022_4_56

Stepan V. Shalupin

Eduard A. Bolelov

Vyacheslav V. Erokhin

Abstract. The quality of operation of objects of radio technical support for flights largely determines both their capabilities for air navigation support and the safety of flights of civil aviation aircraft. In turn, the quality of the work performed for the maintenance of facilities is determined by the level of professional training of the engineering and technical personnel of the services for the operation of radio technical flight support. The analysis of the personnel training system has shown that the forms of training have not changed much and still include lectures, group and practical classes, and exercises at real objects of radio technical support for flights. The methodological support of the implemented forms of training conducted in the training units is visual materials in the form of posters, dummies, interactive tools and layouts that do not provide dynamic filling of the studied methods of functioning and maintenance and repair of specific types of equipment. At the same time, for the personnel of the operation services, the skills and abilities of monitoring the technical condition and modes of operation of the objects of radio technical support for flights, diagnosing failures and technologies for carrying out maintenance work are especially important.

Radical changes in the system of training workers and increasing the effectiveness of this training can be achieved with the introduction of computer simulators based on the method of equipment emulation.

This article is devoted to the analysis of the training system for engineering and technical personnel of the services for the operation of radio equipment and communication facilities, the disclosure of its shortcomings and the consideration of the method of computer emulation of objects of radio technical support for flights, as the basis for building simulator systems.

Keywords: radio engineering support of flights, maintenance, engineering and technical personnel, advanced training, emulation, computer simulator.

Download article in PDF 392.0 kB

The experience of using GNSS software-defined recievers

DOI 10.51955/23121327_2022_1_88

Roman O. Arefyev

Oleg N. Skrypnik

Natalya G. Arefyeva (Astrakhanceva)

Abstract. The paper describes the experience of using software-defined receivers for receiving signals from GPS and Beidou navigation satellites. The peculiarities of the GNSS SDR platform and implementation of the satellite navigation system receivers on its basis were considered. The structure of the GNSS SDR flow graph with description of the functional capacity of each block was shown. As an RF part of the receiver, a HackRF platform with an active antenna and Temperature Controlled Crystal Oscillator was used. The receiver was tested with help of the SN-3803M simulator radiating GPS signals. The dependences of the time required for position-fixing and the number of the navigational satellites which provide tracking on the given false alarm probability were obtained experimentally.

Through natural experiments the authors compared the performance (number of tracking satellites, positioning accuracy, dilution of precision) of the SDR-receiver and ATGM336H portable receiver applied to the GPS and Beidou systems. The main features of the receivers operation were identified and analyzed.

Keywords: GPS, SDR, Beidou, software-defined receiver, dilution of precision, positioning accuracy.

Download article in PDF 449.2 kB

Peculiarities of using a mobile pseudolite for increase of positioning accuracy on aircraft landing *

DOI 10.51955/2312-1327_2021_3_14

Oleg Nikolaevich Skrypnik

Roman Olegovich Arefyev

Natalya Gennadyvna Arefyeva (Astrakhanceva)

Tatyana Yuryevna Portnova

Abstract. The authors study accuracy characteristics (dilution of preсision) of an integrated navigation-and-time field in the terminal area created by GLONASS with its mobile pseudolite augmentation. A mobile pseudolite is placed onboard an unmanned aerial vehicle (UAV). The purpose of the article is optimization of UAV flight path which will provide the best aircraft positioning accuracy. The problem of finding an optimal track for the UAV was solved using Hooke-Jeeves method for an aircraft approaching along a flexible track. The article presents the results of the conducted experiments as the UAV optimal flight paths and their charts built according to DOP values for cases of using stationary and mobile pseudolites. Practical recommendations on the choice of optimization criteria are given, and the conditions for using a mobile pseudolite placed on board an unmanned aerial vehicle are determined.

Keywords: pseudolite, mobile pseudolite, unmanned aerial vehicle, Position Dilution of Precision, GLONASS, optimization of flight trajectory, integrated navigation and time field.

* This work was supported by the Russian Foundation for Basic Research (Grant No. 19-08- 00010 A).

Download article in PDF 564.9 kB

The automation systems of surveillance and control of aerodrome traffic and air traffic management based on ADS-B

UDK 351.814.33 BBK 39.57-5

Knyazhskiy A. Yu.

Plyasovskikh A. P.

Shcherbakov E. S.

An equipment of functional augmentation automatically dependent surveillance-broadcasting are encouraged to include in the automation systems of surveillance and control of aerodrome traffic and automation systems of air traffic control. This augmentation to the equipment complexes allows estimating the error of the coordinates issued automatically by dependent surveillance – broadcasting and to compensate in case of its slow changing. The information from the satellite radio navigation system is not taken into account in case of a rapid change in the error characteristics which are not allowing for sufficiently accurate compensation.

Keywords: SRNS, ADS-B, error, aircraft movement, air traffic control, automation.

Download article in PDF 213.7 kB

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

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.

Download article in PDF 279.1 kB

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

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.

Скачать (269.5 kB)

« Older Entries