| 摘要 |
PROBLEM TO BE SOLVED: To provide methods and apparatus for estimating position location of a mobile device in environments such as urban regions.SOLUTION: At least one electronic device is used to enable access to satellite signal visibility mask information associated with at least one satellite 106 enabled to transmit an RF signal. Such a device establishes enhanced database information associated with a plurality of point locations, and provides at least a portion of the enhanced database information to a mobile device 102. |
