Patent ID: 6270433
Filing Date: 2001-08-07
Classification: A63B,G01S

Abstract:
Apparatus for determining the position of an object in a field, comprising:first and second directional antennas at different locations adjoining said field, each of said antennas having at least one antenna beam pattern having predetermined relation to an electromagnetic antenna boresight, said antennas being mounted for rotation to scan said antenna beams across said field;transmitting and receiving apparatus for transmitting signals between said object and said first and second directional antennas;timing circuits coupled to said receiving apparatus for generating timing signals corresponding to said first and second directional antenna boresight coinciding with said object position;reference timing apparatus for providing time reference signals for said antenna beam scanning of said first and second antennas;and computation circuits responsive to said timing signals and said time reference signals for computing position of said object.