M.E. Fedorov - Post-graduate Student, Irkutsk State Transport University E-mail: metalgear@inbox.ru

The problem of correlation of navigational measurements spaced distance 2,8 km, 4 km and 5 km, in the presented schemes and the conditions of the experiment. The data obtained from single-frequency GPS/GLONASS receivers for 10 minutes and 3,5 hours. Expe-riment with the accumulation time of 1 minute passed using the reference point which was the receiver Trimble thunderbolt mounted on the roof of the building of the Irkutsk State University of Railway Transport. The need for a reference point due to the fact that the accumulation of data is conducted in a short period of time. Three other points of the study were located at different distances from the university building. In the experiment, a single-frequency GPS/GLONASS receivers based on MTK and SIrfStar III chips. In the second experiment, we used data from three single-frequency receivers accumulated over 3,5 hours on the roofs of houses in different points of the city of Irkutsk. The raw data obtained from the NMEA protocol after treatment were studied using MatLAB environment. The results of processing of steel graphs of correlation functions of deviations of latitude and longitude. The results of these experiments are given below. The observation time of 10 minutes is not enough, as much influenced by random processes at the point of measurement. Therefore, one of the points of observation there is no correlation in latitude. Research data obtained in 3,5 hours of observations indicate a direct relationship of the distance between the receivers and the maximum value of the correlation function. As a result of research the maximum correlation coefficient of 0,5 is reached at 3,5 hours storage time at a distance of 2,8 km. It is also possible to note the similarity of the longitude and latitude of deviation in some cases. As a result, we can speak of a low spatial correlation at distances greater than 2,8 km. A closer arrangement requires additional studies in the future. Since there is a problem positioning at low speeds, it is possible the data.

 

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