Patent ID: 6480787
Filing Date: 2002-11-12
Classification: B64G,G01S

Abstract:
A global positioning system (GPS) receiving system having a first GPS receiver mounted on a first moving object and a second GPS receiver mounted on a second moving object, the first and second GPS receivers calculating relative positions and relative velocities of the first and second moving objects by selecting GPS data with a common GPS satellite identification number from first GPS data yielded by the first GPS receiver and second GPS data yielded by the second GPS receiver, at least one of the first moving object and the second moving object comprising:a time tag commonizing unit for commonizing time tags of a first pseudorange between a GPS satellite and the first moving object and a second pseudorange between the GPS satellite and the second moving object; a differential computation unit for calculating a difference between the first pseudorange and the second pseudorange commonized by the time tag commonizing unit; and a time tag error correction unit for correcting the difference with a time tag error attributable to clock inaccuracy of the first GPS receiver and the second GPS receiver.