Position Estimation Through Iterative Inclusion of Measurement Data
First Claim
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1. A method for increasing the accuracy of a wireless location system (WLS), comprising:
- receiving an uplink signal from a mobile device at a plurality of geographically dispersed location measuring units (LMUs);
correlating a reference signal with the uplink signal received at each of the plurality of LMUs;
defining a plurality of baselines corresponding to respective pairs of LMUs;
ranking the baselines based on a quality metric;
determining an initial location solution for the mobile device, wherein the initial location solution is based on at least two baselines but less than all of the baselines; and
iteratively employing one or more additional baselines of the plurality of baselines to improve upon the initial location solution until a stopping condition is met.
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Abstract
In a wireless location system configured to use a baseline correlation method, an iterative approach to increasing location accuracy is disclosed. The quality of received signals is ordered from highest to lowest and used to calculate an initial location. The initial location is modified using the lower quality signals as constrained by the time and frequency deviation from the initial location and velocity estimate.
3 Citations
72 Claims
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1. A method for increasing the accuracy of a wireless location system (WLS), comprising:
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receiving an uplink signal from a mobile device at a plurality of geographically dispersed location measuring units (LMUs); correlating a reference signal with the uplink signal received at each of the plurality of LMUs; defining a plurality of baselines corresponding to respective pairs of LMUs; ranking the baselines based on a quality metric; determining an initial location solution for the mobile device, wherein the initial location solution is based on at least two baselines but less than all of the baselines; and iteratively employing one or more additional baselines of the plurality of baselines to improve upon the initial location solution until a stopping condition is met. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system configured to increase the accuracy of a wireless location system (WLS), the system comprising at least one processor and at least one storage medium communicatively coupled to said at least one processor, the storage medium having stored therein computer-executable instructions for instructing the processor in causing the following steps:
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receiving an uplink signal from a mobile device at a plurality of geographically dispersed location measuring units (LMUs); correlating a reference signal with the uplink signal received at each of the plurality of LMUs; defining a plurality of baselines corresponding to respective pairs of LMUs; ranking the baselines based on a quality metric; determining an initial location solution for the mobile device, wherein the initial location solution is based on at least two baselines but less than all of the baselines; and iteratively employing one or more additional baselines of the plurality of baselines to improve upon the initial location solution until a stopping condition is met. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A computer readable storage medium storing thereon computer executable instructions for increasing the accuracy of a wireless location system (WLS), said computer executable instructions comprising:
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instructions for receiving an uplink signal from a mobile device at a plurality of geographically dispersed location measuring units (LMUs); instructions for correlating a reference signal with the uplink signal received at each of the plurality of LMUs; instructions for defining a plurality of baselines corresponding to respective pairs of LMUs; instructions for ranking the baselines based on a quality metric; instructions for determining an initial location solution for the mobile device, wherein the initial location solution is based on at least two baselines but less than all of the baselines; and instructions for iteratively employing one or more additional baselines of the plurality of baselines to improve upon the initial location solution until a stopping condition is met. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification