Method and apparatus for locating a remote unit
First Claim
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1. A method for locating a remote unit, the method comprising the steps of:
- determining location estimates for a plurality of nodes;
determining errors in the location estimates;
determining a first and a second subset of nodes based on the errors in the location estimates, wherein the first subset of nodes comprises those nodes with lower error values in the location estimates and the second subset of nodes comprises those nodes with higher error values in the location estimates; and
relocating the second subset of nodes by utilizing the first subset of nodes.
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Abstract
A method and apparatus for locating a remote unit (or node) is provided herein. During operation, location-finding equipment (106) will determine a gross location of non-located nodes (104) by determining distances of the nodes (104) to reference nodes (105). Additionally an error estimate in the location for each node is determined. A first subset of nodes having relatively lower error estimates are “promoted” to reference nodes, and a second subset of nodes having higher error estimates are again located based on a distance to the newly-promoted reference nodes.
13 Citations
19 Claims
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1. A method for locating a remote unit, the method comprising the steps of:
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determining location estimates for a plurality of nodes;
determining errors in the location estimates;
determining a first and a second subset of nodes based on the errors in the location estimates, wherein the first subset of nodes comprises those nodes with lower error values in the location estimates and the second subset of nodes comprises those nodes with higher error values in the location estimates; and
relocating the second subset of nodes by utilizing the first subset of nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for locating a remote unit, the method comprising the steps of:
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determining location estimates for a plurality of nodes by determining distances to reference nodes with known locations;
determining errors in the location estimates;
determining a first and a second subset of nodes, wherein the first subset of nodes comprises those nodes with lower errors for the location estimates and the second subset of nodes comprises those nodes with higher errors for the location estimates;
promoting the first subset of nodes to reference nodes; and
relocating the second subset of nodes by determining their distances to the reference nodes. - View Dependent Claims (9, 10, 11)
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12. Location Finding Equipment (LFE) comprising:
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logic circuitry determining location estimates for a plurality of nodes, determining error values for the location estimates, determining a first and a second subset of nodes based on the error values, wherein the first subset of nodes comprises those nodes with lower error values for the location estimates and the second subset of nodes comprises those nodes with higher error values for the location estimates, and relocating the second subset of nodes by utilizing the first subset of nodes; and
a database for storing location estimates. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification