Microsoft Technology Licensing, LLC

Qiang Xu

Jie Jerry Liu

Lucas Neal Joppa

Nissanka Arachchige Bodhi Priyantha

Nissanka Bodhi Priyantha

A location system acquires a first set of Global Navigation Satellite System (GNSS) satellites from a first set of raw GNSS signal data received by a GNSS receiver, using all of the coarse acquisition (C/A) codes for the system of GNSS satellites, to determine a first set of GNSS satellites to use for location processing. At a later time, the location system determines respective sets of GNSS satellites as subsets of successive sets of previously determined sets of GNSS satellites. When the number of identified satellites is less than a threshold, the location system again acquires a set of GNSS satellites from raw data using all of the C/A codes for the system of GNSS satellites.

Acquisition in global navigation satellite systems based on previously acquired satellites

Methods, systems, and computer programs are presented for cloud-offloaded position calculation with on-device acquisition. One method includes operations for collecting raw global positioning system (GPS) signals for a set of positions, and storing in memory the raw GPS signals. The method further includes processing the raw GPS signals in batch mode at the computing device to obtain acquisition data for the positions, where the processing includes identifying tasks for parallel processing by a graphics processing unit (GPU), performing, by the GPU, the tasks in parallel by assigning each of the tasks to a core processor within the GPU, and combining results from performing the tasks to obtain the acquisition data. Additionally, the method includes an operation for transmitting the acquisition data to a server for calculating locations for the set positions at the server, the server storing the locations and making the locations available for location-tracking applications.

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Qiang Xu