Samsung Electronics Co., Ltd.

Bruce McCullough

Mohamed Youssef

Andi Jakupi

Steven A Gronemeyer

William Stewart

Methods, systems, and portable devices capable of adaptive synthetic positioning while in a dead zone are described. In one method, when a portable device having a Global Navigational Satellite System (GNSS) receiver and a dead zone database enters a dead zone, it determines whether the dead zone database has a record for the dead zone. If it does, it retrieves parameters corresponding to the dead zone from the database and calculates synthetic position solutions using the retrieved parameters while in the dead zone. The portable device may also use the synthetic position solutions to help calculate position solutions when exiting the dead zone. If a dead zone database record does not exist, the portable device determines parameters for calculating synthetic position solutions in the dead zone and a new dead zone database record indicating a set of parameters based on the determined set of parameters is created.

Adaptive synthetic positioning

A method for soft frame synchronization in a navigational receiver is provided. A distance between bits of a sync pattern received by the navigational receiver and a known sync pattern is computed. A probability of detection value for the received sync pattern based on the distance is assigned. A confidence level for the received sync pattern using the probability of detection value is computed. The confidence level is compared with a confidence threshold. If the confidence level is greater than or equal to the confidence threshold, the confidence level of the received sync pattern is updated to generate a credibility of the sync pattern. The credibility of the received sync pattern is compared with a predetermined credibility value and, if the credibility of the received sync pattern is greater than or equal to the predetermined credibility value, synchronization of the navigational receiver is performed using the received sync pattern.

Method and apparatus for frame synchronization in a positioning system

Methods, systems, and apparatuses for a portable device capable of receiving satellite navigational system signals to retrieve visibility mask information corresponding to the portable device's current location and/or trajectory are described.

Method and apparatus for guided acquisition and tracking in global navigation satellite system receivers

Disclosed system and method enable a location-unaware device to know its approximate location by wirelessly near-field coupling it to a geo-proximate location-aware device such as a Global Navigation Satellite System&#x2014;(GNSS)-enabled mobile phone. The geo-location data are conveyed in accordance with a predefined signaling protocol. Request and response mechanisms within the devices take the form of predefined data packets that convey geo-location and the devices' unique identification (ID) information.

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Robins, IA, United States of America

Bruce McCullough