Patent ID: 7911448

Claim:
A handheld pointing device, comprising: a first unit that communicates with a receiving unit by Ultra Wide Band signals; a plurality of antennas that receive Ultra Wide Band signals regularly transmitted from the receiving unit; a second unit that is within a main body of the pointing device and that specifies reception timings of the Ultra Wide Band signals on an antenna basis; a third unit that specifies transmission timings of the Ultra Wide Band signals; a fourth unit that calculates propagation distances of the Ultra Wide Band signals, based on the reception timings and the transmission timings; a fifth unit that calculates position coordinates of the pointing device relative to the receiving unit with the propagation distances, based on a principle of triangular surveying; and a sixth unit that calculates an amount of movement of the pointing device, based on a difference between the position coordinates calculated at a last time and the position coordinates calculated at a current time.