Method for determining the length of a path traveled by a vehicle

摘要

Methods are provided for determining the length of a path traveled by a vehicle using an onboard unit that generates a sequence of position readings and a related position quality index for each position reading. A set of consecutive position readings is extracted from the sequence. Position readings are discarded having position quality indices falling below a threshold. A set quality index is determined based on the number of position readings of the set or on the position quality indices. If the set quality index exceeds a threshold, the path length is determined based on mutual distances of consecutive position readings of the set. Otherwise, the path length is determined using a digital road map composed of road segments by associating the position readings of the set with at least one road segment, and determining the path length based on the segment length of the at least one road segment.

主权项

1. A method for determining the length of a path traveled by a vehicle using an onboard unit carried by the vehicle, the unit generating a sequence of readings of an own position thereof and a related position quality index for each position reading of the sequence, comprising:
extracting a set of consecutive position readings from the sequence, disregarding those position readings, the position quality indices of which fall below a predetermined first threshold value; determining a set quality index based on the number of position readings of the set or based on the position quality indices thereof; and if the set quality index exceeds a predetermined second threshold value: determining the path length based on mutual distances of consecutive position readings of the set; otherwise: determining the path length using a digital road map, which is composed of road segments having respective known segment lengths, by associating the position readings of the set with at least one road segment, and determining the path length based on the segment length of the at least one road segment.