System and Method for A-GPS Positioning of a Mobile Device

A method for determining the location of a wireless device comprising the steps of:

• (a) determining a first set of satellites for a region in which the wireless device is located;
• (b) determining a second set of satellites as a function of one or more satellites that are not occluded by the Earth from one or more of said first set of satellites;
• (c) transmitting assistance data to said device, said assistance data including information from said second set of satellites;
• and
• (d) estimating a location of the device from said information.

A system for determining a location of a device from signals received from a plurality of Global Navigation Satellite System (“GNSS”) satellites comprising:

• (a) circuitry for determining a first plurality of satellites for a region in which a device is located;
• (b) circuitry for determining a second plurality of satellites as a function of an intersection of coverage areas of ones of said first plurality of satellites;
• (c) a transmitter for transmitting assistance data to said device, said assistance data including information from said second plurality of satellites;
• and
• (d) circuitry for estimating a location of the device from said information.

A system for determining a location of a device from signals received from a plurality of Global Navigation Satellite System (“GNSS”) satellites comprising:

• (a) circuitry for determining a first set of satellites for a region in which the device is located;
• (b) circuitry for determining a second set of satellites as a function of one or more satellites that are not occluded by the Earth from one or more of said first set of satellites;
• (c) a transmitter for transmitting assistance data to said device, said assistance data including information from said second set of satellites;
• and
• (d) circuitry for estimating a location of the device from said information.

A method for estimating the position of a mobile device using information from a constellation of satellites, comprising the steps of:

• (a) receiving first information from a first set of satellites of said constellation;
• (b) receiving second information from a second set of satellites of said constellation wherein said second set is selected based on said first information;
• (c) transmitting data based on said second information to said device;
• and
• (d) estimating a location of said device based on said data.

A method for estimating the position of a mobile device using information from a constellation of satellites, comprising the steps of:

• (a) selecting a first set of satellites of said constellation;
• (b) selecting a second set of satellites of said constellation as a function of first signals received from said first set of satellites;
• (c) transmitting to said device data based on second signals received from said second set of satellites;
• and
• (d) estimating a location of said device based on said data.

A method for determining the location of a wireless device comprising the steps of:

• (a) determining a first plurality of satellites for a region in which the wireless device is located;
• (b) obtaining a satellite measurement, using said device, from at least one of said first plurality of satellites;
• (c) determining a second plurality of satellites as a function of an intersection of coverage areas of said at least one satellite and at least one other satellite of said first plurality of satellites;
• (d) transmitting assistance data to said device, said assistance data including information from said second plurality of satellites;
• and
• (e) estimating a location of the device from said information.