Position determination system that uses a cellular communication system
First Claim
1. A method for determining the position of a mobile station using a plurality of cellular base stations each emitting a unique pilot signal, comprising:
- taking a plurality of substantially independent data measurements of the pilot signals from each of said plurality of cellular base stations, each of said data measurements including an earliest time of arrival estimate for each pilot signal, thereby providing a plurality of independent measurements of the earliest time of arrival for each of the pilot signals from said plurality of cellular base stations;
for each cellular base station, calculating a representative measurement of the earliest time of arrival responsive to said independent measurements for said cellular base station; and
utilizing at least one of said representative measurements to determine the position of said mobile station.
1 Assignment
0 Petitions
Accused Products
Abstract
A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.
-
Citations
33 Claims
-
1. A method for determining the position of a mobile station using a plurality of cellular base stations each emitting a unique pilot signal, comprising:
-
taking a plurality of substantially independent data measurements of the pilot signals from each of said plurality of cellular base stations, each of said data measurements including an earliest time of arrival estimate for each pilot signal, thereby providing a plurality of independent measurements of the earliest time of arrival for each of the pilot signals from said plurality of cellular base stations;
for each cellular base station, calculating a representative measurement of the earliest time of arrival responsive to said independent measurements for said cellular base station; and
utilizing at least one of said representative measurements to determine the position of said mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A system for determining the position of a mobile station using a plurality of cellular base stations each emitting a unique pilot signal, comprising:
-
data taking means for taking a plurality of substantially independent data measurements of the pilot signals from each of said plurality of cellular base stations, each of said data measurements including an earliest time of arrival estimate for each pilot signal, thereby providing a plurality of independent measurements of the earliest time of arrival for each of the pilot signals from said plurality of cellular base stations;
calculation means for calculating a representative measurement for each cellular base station, including means for calculating the earliest time of arrival responsive to said independent measurements for each respective cellular base station; and
positioning means, responsive to at least one of said representative measurements, for determining the position of said mobile station. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A mobile station that utilizes a cellular network that includes a plurality of cellular base stations each emitting a unique pilot signal, comprising:
-
a cellular communication system for communicating with said cellular base stations;
a database that stores a plurality of data measurements including an earliest time of arrival estimate for each pilot signal, including multiple substantially independent data measurements for each pilot signal;
a representative measurement calculation system configured to receive data measurements from said database, and responsive thereto to provide a representative measurement of the time of arrival for each pilot signal; and
a position calculation and control system configured to receive said representative measurements for each pilot signal, and responsive thereto, to determine the position of the mobile station. - View Dependent Claims (29, 30, 31, 32, 33)
-
Specification