Method for ambiguity resolution in location determination
First Claim
1. A method for resolving ambiguity in location determination with a number, N, of ambiguous location determination solutions using clock temporal bias value comprising:
- generating a probability distribution function (PDF) model for clock temporal bias;
obtaining N clock temporal bias values of a clock within a mobile station receiver for the N ambiguous location determination solutions, wherein at least one of the N ambiguous location determination solutions is an ambiguous solution due to presence of noisy measurements;
inserting each of the N clock temporal bias values into the PDF model;
evaluating the PDF model to get N PDF values;
setting N goodness metrics to the N PDF values;
comparing the N goodness metrics;
defining a maximum goodness metric as the largest of the N goodness metrics; and
determining a final location determination solution by selecting a one of the N ambiguous location determination solutions having the maximum goodness metric.
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Abstract
A method using various heuristics techniques for resolving ambiguity in location determination in environments with or without noise. A final location determination solution may be determined from a set of ambiguous location determination solutions by using clock temporal bias value, by using consistency information of ranging signal order such as the time of arrival and/or the received power level of the ranging signals, by using the distances to the sources, and/or by using other discriminator functions to select the final location determination solution from a plurality of ambiguous location determination solutions. The main advantage of the heuristic approaches is that redundant measurements are not required for location determination solution disambiguation.
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Citations
17 Claims
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1. A method for resolving ambiguity in location determination with a number, N, of ambiguous location determination solutions using clock temporal bias value comprising:
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generating a probability distribution function (PDF) model for clock temporal bias; obtaining N clock temporal bias values of a clock within a mobile station receiver for the N ambiguous location determination solutions, wherein at least one of the N ambiguous location determination solutions is an ambiguous solution due to presence of noisy measurements; inserting each of the N clock temporal bias values into the PDF model; evaluating the PDF model to get N PDF values; setting N goodness metrics to the N PDF values; comparing the N goodness metrics; defining a maximum goodness metric as the largest of the N goodness metrics; and determining a final location determination solution by selecting a one of the N ambiguous location determination solutions having the maximum goodness metric. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Computer readable media embodying a program of instructions executable by a computer to perform a method for resolving ambiguity in location determination with a number, N, of ambiguous location determination solutions using clock temporal bias value, the method comprising:
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generating a probability distribution function (PDF) model for clock temporal bias; obtaining N clock temporal bias values of a clock within a mobile station receiver for the N ambiguous location determination solutions, wherein at least one of the N ambiguous location determination solutions is an ambiguous solution due to presence of noisy measurements; inserting each of the N clock temporal bias values into the PDF model; evaluating the PDF model to get N PDF values; setting N goodness metrics to the N PDF values; comparing the N goodness metrics; defining a maximum goodness metric as the largest of the N goodness metrics; and determining a final location determination solution by selecting a one of the N ambiguous location determination solutions having the maximum goodness metric. - View Dependent Claims (8, 9, 10)
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11. A method for resolving ambiguity in location determination with a number, N, of ambiguous location determination solutions using clock temporal bias value comprising:
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obtaining N clock temporal bias values of a clock within a mobile station receiver for the N ambiguous location determination solutions, wherein a subset of the N ambiguous location determination solutions represent ambiguous location solutions due to presence of noisy measurements in each of the subset of the N ambiguous location determination solutions; determining a plurality of goodness metrics based on the N clock temporal bias values and a probability distribution function (PDF) model for clock temporal bias; and determining a final location determination solution from the N ambiguous location determination solutions based on a maximum goodness metric. - View Dependent Claims (12, 13, 14, 15)
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16. A method for resolving ambiguity in location determination with a number, N, of ambiguous location determination solutions using clock temporal bias value comprising:
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obtaining the number, N, of ambiguous location determination solutions, wherein a location ambiguity for each of the N ambiguous location determination solutions is due to at least one of insufficient measurements or presence of noisy measurements; obtaining a probability distribution function (PDF) model for clock temporal bias; obtaining a clock temporal bias value of a clock within a mobile station receiver for each of the number, N, of ambiguous location determination solutions; inserting each of the clock temporal bias values into the PDF model to obtain a PDF value for each of the clock temporal bias values; selecting a location determination solution associated with a maximum PDF value. - View Dependent Claims (17)
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Specification