Method and system for selecting optimal satellites for a-gps location of handsets in wireless networks
AssigneeAndrew Corporation
InventorsPeter John Rhodes, Neil Harper
Life of this patent
Estimating the term…
Abstract
A system and method for determining a set of satellites for which assistance data may be provided to a wireless device. A boundary for an approximate area in which the wireless device is located may be determined and one or more sets of satellites may be determined as a function of the boundary. An optimum set of satellites from the one or more sets of satellites may then be determined using a satellite selection function on the one or more sets of satellites at predetermined points substantially on the boundary.
Claims18
A method for determining a set of satellites for which assistance data may be provided to a wireless device, comprising the steps of:
- (a) determining a boundary for an approximate area in which the wireless device is located;
- (b) determining one or more sets of satellites as a function of said boundary;
- and
- (c) determining an optimum set of satellites from said one or more sets of satellites as a function of the dilution of precision (“DOP”) of each of said one or more sets of satellites at predetermined points substantially on said boundary.
A method for determining a set of satellites for which assistance data may be provided to a wireless device, comprising the steps of:
- (a) determining a boundary for an approximate area in which the wireless device is located;
- (b) determining one or more sets of satellites as a function of said boundary;
- (c) determining an optimum set of satellites from said one or more sets of satellites as a function of the dilution of precision (“DOP”) of each of said one or more sets of satellites at predetermined points substantially on said boundary;
- (d) transmitting assistance data to said device, said assistance data including information from said optimum set of satellites;
- and
- (e) determining the location of the wireless device from said information.
A system for determining a set of satellites for which assistance data may be provided to a wireless device comprising:
- (a) circuitry for determining a boundary for an approximate area in which a wireless device is located;
- (b) circuitry for determining one or more sets of satellites as a function of said boundary;
- and
- (c) circuitry for determining an optimum set of satellites from said one or more sets of satellites as a function of a satellite selection function at predetermined points substantially on said boundary,
- wherein said satellite selection function is
- f
- DOPBased
- =
- ∑
- i
- =
- 1
- noPoints
-
- DOP
- i
- (
- )
- ,
- and wherein DOPi represents the dilution of precision at each point (i) selected substantially on the boundary of the approximate area.
Dependencies are inferred from the claim text.