Abstract: A multi-magnetometer device comprises at least two z-axis aligned and physically rotated magnetometer triads utilized for measuring corresponding earth's magnetic field. The magnetic field measurements are utilized to measure rotation measurements of a single orthogonal axis along the 360 degrees of the complete circle without user's assistance and/or magnetometer movement for magnetometer calibration. The multi-magnetometer device may compute its magnetic heading utilizing the magnetic field measurements if no magnetic perturbations are detected. When magnetic perturbations are detected, a perturbation mitigation process may be performed. The rotation measurements may be generated by selectively combining the magnetic field measurements. Hard-iron components are determined utilizing the rotation measurements, and are removed from the magnetic field measurements.

Abstract: A multi-magnetometer device comprises at least two z-axis aligned and physically rotated magnetometer triads utilized for measuring corresponding earth's magnetic field. The magnetic field measurements are utilized to measure rotation measurements of a single orthogonal axis along the 360 degrees of the complete circle without user's assistance and/or magnetometer movement for magnetometer calibration. The multi-magnetometer device may compute its magnetic heading utilizing the magnetic field measurements if no magnetic perturbations are detected. When magnetic perturbations are detected, a perturbation mitigation process may be performed. The rotation measurements may be generated by selectively combining the magnetic field measurements. Hard-iron components are determined utilizing the rotation measurements, and are removed from the magnetic field measurements.

Abstract: A mobile device learns cell information for a serving cell and for neighbor cells. The learned cell information is communicated to a remote location server for locating base stations within the serving and/or neighbor cells. The learned cell information comprises cell signal strength information and/or other cell information such as cell identifiers (Cell-IDs) and Country Code (MCC). Received signal strength (RSS) on the serving cell and the neighbor cells are measured. Locations pertaining to the RSS measurements are determined. The mobile device location stamps the RSS measurements utilizing the determined locations to generate a neighbor cell report, which is utilized by a cellular communication network to prepare a handover operation whenever needed, and/or to build a local cell-learning database. A portion of the local cell-learning database is transmitted as cell data to the remote location server that collects cell data from a plurality of mobile devices.