POTABLE DEVICE INCLUDING GLOBAL NAVIGATIONAL SATELLITE SYSTEM RECEIVER AND METHOD OF ADAPTIVE SYNTHETIC POSITIONING THEREOF

摘要

The present invention relates to an adaptive synthetic position determining method of a portable device having a GNSS receiver. The adaptive synthetic position determining method comprises: a step for determining whether or not a record for a dead zone exists in a dead zone database when the portable device is entered into the dead zone; a step for searching polynomial coefficients corresponding to the dead zone from the dead zone database when the record for the dead zone exists in the dead zone database; a step for calculating one or more synthetic position solutions by using the polynomial coefficients while the portable device is positioned in the dead zone; and a step for using at least one of the synthetic position solutions to calculate one or more position solutions when the portable device exists in the dead zone. The dead zone includes an area in which the portable device cannot receive GNSS satellite signals or the intensity of the received GNSS satellite signals is less than a reference value.