Patent ID: 7501976
Filing Date: 2009-03-10
Classification: G01S,G08G

Abstract:
1. A method for determining a position of a vehicle within a field of view using a traffic sensor, the method comprising: a) mounting the traffic sensor at a fixed location relative to a road; b) modulating a microwave signal to produce a periodic time-varying modulated signal; c) radiating the periodic time-varying modulated microwave signal in a radiation beam at a vehicle on a road to generate a reflected modulated microwave signal, wherein the reflected periodic time-varying modulated microwave signal induces a first received signal at a first receiver antenna and a second received signal at a second receiver antenna, the second receiver being spaced from the first receiver; and, d) determining the position of the vehicle on the road, wherein the position comprises a lateral position of the vehicle across a width of the road and a longitudinal position of the vehicle along a length of the road, within the field of view based on the periodic time-varying modulated signal, the first received signal, and the second received signal, wherein the position of the vehicle is determinable during a single period of the periodic time-varying modulated signal.