Position estimation of transceivers in communication networks
First Claim
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1. A wireless position estimation method, comprising:
- statistically filtering time of flight information resulting from replies to queries to produce a plurality of range measurements, wherein said filtering further comprises;
distributing a batch of time of flight data into predetermined histogram bins for extraction of a desired data;
implementing an estimator to said desired data after every one or more new batch of extracted data;
wherein said estimator minimizes a quadratic cost function of residual error and includes the previous estimate plus the scaled residual error; and
calculating in a feedback operation, a position estimate from weighted values as a result of processing a predetermined collected number of filtered said range measurements.
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Abstract
This invention provides a system and method using wireless communication interfaces coupled with statistical processing of time-of-flight data to locate by position estimation unknown wireless receivers. Such an invention can be applied in sensor network applications, such as environmental monitoring of water in the soil or chemicals in the air where the position of the network nodes is deemed critical. Moreover, the present invention can be arranged to operate in areas where a Global Positioning System (GPS) is not available, such as inside buildings, caves, and tunnels.
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20 Claims
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1. A wireless position estimation method, comprising:
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statistically filtering time of flight information resulting from replies to queries to produce a plurality of range measurements, wherein said filtering further comprises; distributing a batch of time of flight data into predetermined histogram bins for extraction of a desired data; implementing an estimator to said desired data after every one or more new batch of extracted data;
wherein said estimator minimizes a quadratic cost function of residual error and includes the previous estimate plus the scaled residual error; andcalculating in a feedback operation, a position estimate from weighted values as a result of processing a predetermined collected number of filtered said range measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless position estimation system, comprising:
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at least one receiver, capable of sending a wireless reply upon receipt of each of one or more wireless queries; one or more transmitters capable of being arranged from known positions and capable of transmitting a plurality of said wireless queries; and an estimator that minimizes a quadratic cost function of residual error and includes a previous estimate plus a scaled residual error of extracted data so that a position estimate from weighted values can be calculated, wherein said wireless reply comprises one or more batches of data that are statistically filtered using said estimator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification