METHOD OF MONITORING BAROMETRIC HEIGHT SYSTEMATIC ERRORS BASED ON SPEED DATA Russian patent published in 2019 - IPC G01C5/06 

FIELD: navigation systems.

SUBSTANCE: invention relates to the field of navigation equipment and can be used in the air traffic management system under conditions of reduced vertical separation intervals. Method of monitoring of barometric altitude measurement systematic errors consists in the fact that, from aircrafts located in the area of space allocated for monitoring, at certain periodicity, information is transmitted about side number, true air speed, heading angle, path velocity vector, barometric flight altitude, time, geographical coordinates, as well as ambient air temperature. Transmitted information is received by ground radio station. Entire volume of data obtained in a given area of space is divided into observation sessions, each of which is determined in space and time. Process of measurement results processing is divided into two stages. First step consists in formation of a wind vector from data on measured on-board air and ground speed vectors. True air speed vector is represented in the form of data on its module and direction (course). Ground speed vector transmitted from the board is generated in the standard on-board satellite navigation system. Data on the wind vector obtained for all aircrafts are averaged and used to determine the reference value of the true air speed vector of each aircraft participating in the session. Difference between the modules of the reference value and the actual air speed obtained from the board determines the estimate of the error in the true air speed obtained in this session, which is used when determining the static pressure measurement error. Error of barometric height measurement is determined by static pressure measurement error in this session. At the second stage of processing by means of averaging of data on measurement error of barometric height, obtained in different sessions, required systematic error is selected. This value is compared with the assigned ICAO allowable value and enables to identify potentially dangerous aircraft with high systematic errors of barometric height measurement.

EFFECT: high reliability of results of monitoring systematic errors of measuring barometric height by eliminating the effect of uncertainty of the origin of the reference when determining the error of the barometric height.

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