US 7,065,368 B2 · Method for correcting NLOS error in wireless positioning system

Abstract

Provided is a method for correcting a non-line-of-sight (NLOS) error in a wireless positioning system that enhances the location accuracy of a mobile station by correcting location error caused by NLOS propagation when the mobile station is positioned in a wireless mobile communication environment, and a computer-readable recording medium for recording a program that implements the method. The method checks out the location of the MS in the above environment and provides diverse services by correcting the location error caused by NLOS propagation included in a received signal. That is, a user can enjoy a high-quality location service by receiving the location information only within the radius which user wants, such as traveler's information, vehicle tracking, location service, and location-based advertisements, because the location of the user's MS is detected precisely.

Claims17

Dependent claims

A method for correcting a non-line-of-sight (NLOS) error in a wireless positioning system, comprising the steps of:

a) determining whether the number of received signals from a mobile station (MS) is larger than a predetermined number;
b) if the number of the received signals from the mobile station is equal to or less than the predetermined number, determining a location of the MS based on weighting factors obtained through an optimization process with respect to each of the received signals which are assumed to include an error caused by NLOS propagation;
and
c) if the number of the received signals from the mobile station is larger than the predetermined number, determining a location of the MS based on second moments of the received signals,
wherein the step b) includes the steps of:
b1) making constraints and obtaining a weighting factors through an optimization process with respect to each received signal which is assumed to include an error caused by NLOS propagation;
and
b2) based on the weighting factors, correcting the NLOS error and determining the location of the MS.

5 more elements

Dependencies are inferred from the claim text.

Method for correcting NLOS error in wireless positioning system

Life of this patent

Method for correcting NLOS error in wireless positioning system

Life of this patent

Abstract

Claims17