Patent Document ID: 9587951
Application ID: 14304938
Patent Status: 1

Claim One:
1. A map matching method for tracking and determining an improved position of a reference asset, the method comprising: receiving at least one global navigation satellite system (GNSS) current position probe from the reference asset, each current position probe comprising a current position of the reference asset, a heading direction of the reference asset, and a speed of the reference asset; requesting and receiving information from a geographical information system (GIS) unit on a plurality of probable road network segments on which the at least one GNSS current position probe is capable of being snapped; computing a weighted cost function for each of the probable road network segments, wherein the weighted cost function of each probable road network segment is computed as a function of two weighting factors for considering weight for at least one of distance and angle related fractions, a distance between the current position of the reference asset and the road network segment, an input maximal distance difference, an absolute angle difference between the received heading direction of the reference asset and a heading direction of the road network segment, an input maximal angle difference, and an angle error of the road network segment, wherein the angle error of the road network segment is computed as a weighted function; and snapping and information fusing the current position of the reference asset with a selected road network segment having the minimum weighted cost function out of the probable road network segments.