Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2011-06-07
2011-06-07
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
Reexamination Certificate
active
07956808
ABSTRACT:
A method for improving the results of radio location systems that incorporate weighted least squares optimization generalizes the weighted least squares method by using maximum a posteriori (MAP) probability metrics to incorporate characteristics of the specific positioning problem (e.g., UTDOA). Weighted least squares methods are typically used by TDOA and related location systems including TDOA/AOA and TDOA/GPS hybrid systems. The incorporated characteristics include empirical information about TDOA errors and the probability distribution of the mobile position relative to other network elements. A technique is provided for modeling the TDOA error distribution and the a priori mobile position. A method for computing a MAP decision metric is provided using the new probability distribution models. Testing with field data shows that this method yields significant improvement over existing weighted least squares methods.
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Boyer Pete A.
Mia Rashidus S.
Segall Edward J.
Mull Fred H
Tarcza Thomas H
TruePosition, Inc.
Woodcock & Washburn LLP
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