Patent ID: 7443359
Filing Date: 2008-10-28
Classification: G01V,H01Q

Abstract:
1. A method for location determination, comprising: configuring a transmitter to include an elongated generally planar loop antenna defining an elongation axis positioning the elongation axis of said antenna along at least a portion of a path; generating a monotone single phase magnetic field from the antenna; determining certain characteristics of the magnetic field at a receiving position radially displaced from the antenna elongation axis with the receiving position located in one of four quadrants that are defined in relation to the elongation axis of the elongated generally planar loop antenna such that a flux pattern of the planar loop antenna is ambiguous with respect to uniquely determining an actual quadrant in which the receiving position is located; and establishing at least one orientation parameter which characterizes a positional relationship between the receiving position and the antenna on the path to identify the actual quadrant of the receiving position.