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Maintaining the integrity of navigation measurements for vehicles through the use of local radio-navigation system


V.N. Efanov, L.R. Sayapova

At the present time to improve traffic management, safety of passenger transportation, special and dangerous goods are widely used car navigation system (ANS) based on satellite navigation. Satellite navigation systems (SNS), despite its obvious benefits, does not always provide the required positioning accuracy, and in some cases may be unusable. The main sources of noise that affect the integrity of navigational measurements include: ionosphere, troposphere errors, errors due to multipath signal propagation, as well as due to geometric factors relative position of navigation satellites relative to the vehicle and possible sources of unintentional man-made interference such as transmission of digital data (packet radio) communication satellite signals Iridium, Globalstar, amateur radio relay stations and offices, VHF radios, etc. To compensate for the errors are often invited to choose the optimal configuration of the constellation of navigation satellites, for which the influence of instrumental errors and errors of pseudorange measurement of clock accuracy in calculating the coordinates of the object is minimized. The values of geometric factors decrease with an increase in the number of satellites involved and depend on their location in orbit. The minimum value is achieved when the factors mentioned maximum volume of the tetrahedron formed by the unit vector directed from the consumer to the satellites, which are determined by the navigation options. Is based on this algorithm to choose the best configuration for the measurement of the number of satellites visible by the consumer. To solve the problem of determining the coordinates of the vehicle and use the correct time scale modified Newton-Raphson. It is advisable to use a more efficient ground-based addition to the satellite-based navigation of local radio-navigation system (LRNS), constructed using ground psevdosputnikov. Use as psevdosputnikov cellular base stations to optimize system performance and improve the local navigation area of coverage. Base stations are usually placed on rooftops and towers. They have all the opportunities for transmission of navigation signals. Thus, presented in this paper the concept of integrated telematic platform unifies ITS software and hardware environment for the implementation of a broad class of projects with regional and departmental specifics. Using standard open architecture of information systems creates opportunities for their scalability, portability and interoperability, which provides good opportunities for further development of the intelligent system
June 24, 2020
May 29, 2020

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