Reduced acquisition time for GPS cold and warm starts
First Claim
Patent Images
1. A method for reducing acquisition times in a GPS receiver associated with a cellular device, comprising the steps of:
- determining at startup of the GPS receiver occurrence of at least one of the following conditions;
ephemeris data at the GPS receiver older than a predetermined period of time and a change in a mobile country code and mobile network code of the cellular device associated with of the GPS receiver;
obtaining data for the GPS receiver from a reference server responsive to occurrence of one of the conditions; and
calculating a current position of the GPS receiver at a reduced acquisition time using at least the obtained data.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for reducing acquisition times in a GPS receiver enables determination at start-up of the GPS receiver of the occurrence of ephemeris data at the GPS receiver being older than approximately two hours or a change in a mobile country code and mobile network code of a cellular device associated with the GPS receiver. Data is obtained for the GPS receiver from a reference server responsive to occurrence of one of these conditions and the position of the GPS receiver is determined at a reduced acquisition time using the obtained data.
-
Citations
29 Claims
-
1. A method for reducing acquisition times in a GPS receiver associated with a cellular device, comprising the steps of:
-
determining at startup of the GPS receiver occurrence of at least one of the following conditions;
ephemeris data at the GPS receiver older than a predetermined period of time and a change in a mobile country code and mobile network code of the cellular device associated with of the GPS receiver;
obtaining data for the GPS receiver from a reference server responsive to occurrence of one of the conditions; and
calculating a current position of the GPS receiver at a reduced acquisition time using at least the obtained data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19)
-
-
13. A method for reducing acquisition times in a GPS receiver associated with a cellular device, comprising the steps of:
-
determining at startup of the GPS receiver occurrence of a change in a mobile country code or mobile network code of the cellular device associated with the GPS receiver;
accessing a table of mobile country codes and mobile network codes having position data associated therewith;
comparing the present mobile country code and mobile network code with entries in the table to locate a corresponding mobile country code and mobile network code;
selecting the position data associated with a corresponding mobile country code and mobile network code as an approximate position of the GPS receiver; and
calculating a current position using the approximate position of the GPS receiver at a reduced acquisition time using at least the position data.
-
-
20. A wireless communications device, comprising:
-
a wireless transceiver for establishing a connection with the Internet;
a GPS receiver for determining a position of the wireless communications device;
a table including a plurality of mobile country code and mobile network code pairs, each pair of mobile country codes and mobile network codes having a longitude and latitude associated therewith;
a controller configured to;
determine at startup of the GPS receiver occurrence of at least one of the following conditions;
ephemeris data at the GPS receiver older than a predetermined period of time and a change in a mobile country code and mobile network code of the wireless communications device;
obtain an approximate position of the GPS receiver from the table based upon a present mobile country code and mobile network code associated with the GPS receiver. obtain data for the GPS receiver from a reference server on the Internet using the wireless transceiver responsive to occurrence of one of the conditions; and
determine a current position of the GPS receiver at a reduced acquisition time using at least the obtained data and the approximate position. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
-
Specification