Location determination using weighted ridge regression
AssigneeLucent Technologies Inc.
InventorsByron H. Chen, Ren Da, Ibrahim Tekin
Life of this patent
Estimating the term…
Abstract
Weighted ridge regression (WRR) processing is applied to three or more distance measurements to determine the location of a terminal. For example, in an integrated satellite-based navigation system/wireless network, the location of a mobile unit can be determined by applying WRR processing to at least three distance measurements, where one or more of the distance measurements are satellite-based distance measurements (e.g., GPS pseudorange measurements) and one or more are wireless network-based distance measurements (e.g., round-trip delay or pilot phase offset measurements). WRR processing provides improved accuracy in the determination of mobile unit position over conventional least mean square techniques.
Claims20
A method for determining location of a terminal, comprising the steps of:
- (a) assigning a weight value to at least one of a set of three or more distance measurements corresponding to three or more different sources relative to the terminal to generate a weighted set of distance measurements, wherein:
- the terminal is a mobile unit in a wireless network;
- at least one of the distance measurements is a wireless network-based distance measurement;
- at least one of the distance measurements is a satellite-based distance measurement;
- and
- the at least one wireless network-based distance measurement and the at least one satellite-based distance measurement are assigned different weight values;
- (b) assigning a value for an insertion parameter;
- and
- (c) performing weighted ridge regression (WRR) processing based on the weighted set of distance measurements and the insertion parameter to determine a WRR estimate representing the location of the terminal.
A machine-readable medium, having encoded thereon program code, wherein, when the program code is executed by a machine, the machine implements a method for determining location of a terminal, comprising the steps of:
- (a) assigning a weight to at least one of a set of three or more distance measurements corresponding to three or more different sources relative to the terminal to generate a weighted set of distance measurements, wherein:
- the terminal is a mobile unit in a wireless network;
- at least one of the distance measurements is a wireless network-based distance measurement;
- at least one of the distance measurements is a satellite-based distance measurement;
- and
- the at least one wireless network-based distance measurement and the at least one satellite-based distance measurement are assigned different weight values;
- (b) assigning a value for an insertion parameter;
- and
- (c) performing weighted ridge regression (WRR) processing based on the weighted set of distance measurements and the insertion parameter to determine a WRR estimate representing the location of the terminal.
Dependencies are inferred from the claim text.