METHOD FOR DETERMINATION OF INTERVAL ESTIMATION OF VELOCITY MAGNITUDE OF RAILWAY VEHICLE USING GNSS AND SUBSYSTEM TO IMPLEMENT THIS METHOD

The invention relates to a method for determination of the interval estimation of the velocity magnitude of a railway vehicle using GNSS in the railway environment, during which, initially, an estimate of the vehicle velocity vector, including the confidence ellipsoid are determined in the ECEF WGS84 coordinate system, and subsequently this estimate is transformed into the local END coordinate system; furthermore, from such transformed velocity vector estimate, a 2D estimate of the velocity vector in the horizontal plane is determined, from which a confidence interval of 〈v̂EN,min , v̂EN,max 〉 representing the estimate of the horizontal velocity magnitude of the vehicle is determined, and subsequently, an estimate v̂U,max of the maximum possible magnitude of the vertical vehicle velocity is determined from the maximum possible longitudinal slope βmax of the track and the design speed of the vehicle or the estimate of the horizontal velocity magnitude of the vehicle, after which the estimates of horizontal and vertical velocity magnitudes are combined into the final interval estimate of the total magnitude of the railway vehicle velocity, and thus obtained estimate is stored into the memory and/or shown on the display. For the aforementioned method, a subsystem is used, which subsystem contains a GNSS receiver (A) receiving signals from GNSS satellites, which receiver is connected to a bus (F) to which Memory 1 (B), a processor (C), Memory 2 (E) and Memory 3 (G) are connected.