Patent ID: 6012013
Filing Date: 2000-01-04
Classification: G01S

Abstract:
A method of determining location and speed of a mobile unit along a path in a Small Geographic Area (SGA) in a uni-dimensional coordinate system, said method comprising the steps of:obtaining the coordinate fix and the speed of said mobile unit in a preferred coordinate system using a position and speed determining system (PSDS);transforming the coordinate fix and speed of said mobile unit from said preferred coordinate system into said uni-dimensional coordinate system using a user's computer;retrieving a digital database of said SGA from a memory of said user's computer, wherein said SGA comprises a plurality (m) of points in an arbitrary coordinate system, m being an integer;defining the original connectivity of said plurality of (m) points of said SGA in said arbitrary coordinate system, wherein the connectivity of each two points passable by said mobile unit is different from the connectivity of each two points not passable by said mobile unit;translating points inside said digital database from said arbitrary coordinate system into said preferred coordinate system by an executable program loaded into said user's computer;defining said uni-dimensional coordinate system in said preferred coordinate system by using said executable program of said user's computer; andoutputting the coordinate fix and the speed of said mobile unit in said uni-dimensional coordinate system.