UDC 621.391:621.396 BBK 39.57-5

Skrypnik O. N.

Main types of coordinate systems used for solving air navigation tasks that are connected with the provision of aeronautical flight control and landing are examined in the article. The main requirements for coordinate systems are given.

Local (orthogonal, cylindrical and spherical) coordinate systems were studied, their advantages and disadvantages as well as areas of their application were highlighted. Direct and backward coordinate transformations between the local coordinate systems were shown.

The author shows distinctive features of global coordinate systems application which are connected with choosing the Earth’s figure model and its mathematical description problems. Basic information about the global terrestrial ellipsoids and their parameters is presented. The need to shift to the global terrestrial ellipsoid and global reference systems is demonstrated. Basic information about the ITRS and ITRF is given. Differences in determining an object’s space coordinates in these reference systems are described. Differences in the areas of application of PZ-90 and SK-2011systems as well as their prototypes WGS-84 and NAD-83 are specified.

The author considers peculiarities of global geodesic and geospheric (great-circle) coordinate systems, their advantages and disadvantages. Direct and backward coordinate transitions for global coordinate systems as well as expressions that link geocentric and topocentric coordinate systems are illustrated.

Key words: coordinate system, geoid, global terrestrial ellipsoid, coordinate transformations, a local coordinate system, a geodetic coordinate system, air navigation.

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UDC 004.588 BBK 74.5

Chokoj V. Z.

Aircraft maintenance procedures imply doing different work of logistic, organizational and technical and technological character. Their common issues are those of surveillance objects and processes for the purpose of numerical data collection, processing and exploratory data analysis before using for taking decisions. The urgent issues of mathematical and instrumental support for processing and exploratory data analysis within the operating company and under teaching in educational establishments of civil aviation are discussed in this regard.

Key words: sample, binary sequence, data processing, filtering, exploratory analysis, stationarity of sample values, outlier analysis, statistical criteria.

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UDC 629.42:629.4.054, 625.28 BBK 39.235

Ablyalimov O. S.

The article presents the results of studies of the analysis and justification of efficiency of use of the main (train) three-unit diesels UzTE16М3 on the hilly-mountain area of Marokand – Navoi of the Uzbek Railways in the movement of freight trains with stops and without them at thestations en route, siding lines and separate stations. The obtained parameter values of the main indicators of the transport operation of the tested locomotives UzТЕ16М3 will be quite helpful for engine driver-instructors and specialists of the shop operation of the locomotive depot Samarkand, Bukhara in estimating the traction properties of track sides of a path profile and effectiveness of the operational activities of the mentioned real railway part of the JSC “Uzbekiston Temir Yullari”.

Keywords: research, result, freight train, movement, locomotive, railroad, track section, operation, condition, direction, speed, rolling stock, analysis, hilly and mountainous, estimation, station, submit, average, track side, profile.

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