GLOBAL POSITIONING SYSTEM TAG SYSTEM

摘要

A communications system (10) for determining the position and velocity of an object using a plurality of GPS signals transmitted by a plurality of GPS sources includes an interrogator (12) remote from the object (16) and responsive to the plurality of GPS signals (20). The interrogator (12) transmitts an RF signal (26) comprising GPS source information and at least one of frequency information and time and code phase information of at least one of the GPS signals (20). The system also includes a transponder (14) positioned on the object and responsive to the RF signal (26) and the plurality of GPS signals (20).