Methods for locating transmitters using backward ray tracing
First Claim
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1. A method for locating a transmitter, the method comprising:
- generating, at a receiver, a plurality of candidate locations for the transmitter based on signal ray characteristics of a plurality of signal rays, the candidate locations being points along an estimated path traversed by the plurality of signal rays from the transmitter to the receiver;
calculating, for each candidate location, at least one weighted metric by summing a plurality of location metrics associated with each respective candidate location; and
locating the transmitter based on the at least one weighted metric associated with each candidate location.
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Abstract
According to a method for localizing a transmitter inside a building, a transmitter emits rays which undergo multiple reflections with the walls, ceilings and floors of the building. Each of K receivers receives rays from the transmitter, and the receivers estimates the AOA (Angle of arrival), TOA (Time of Arrival) and power of each ray. At least one of the receivers uses a known blueprint of the building and material characteristics of the walls to localize the transmitter to a higher degree of accuracy by applying a backward ray tracing algorithm.
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Citations
20 Claims
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1. A method for locating a transmitter, the method comprising:
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generating, at a receiver, a plurality of candidate locations for the transmitter based on signal ray characteristics of a plurality of signal rays, the candidate locations being points along an estimated path traversed by the plurality of signal rays from the transmitter to the receiver; calculating, for each candidate location, at least one weighted metric by summing a plurality of location metrics associated with each respective candidate location; and locating the transmitter based on the at least one weighted metric associated with each candidate location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 14, 15, 16)
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10. (canceled)
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12. (canceled)
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17. A transceiver for locating a transmitter, the transceiver comprising:
a location estimation unit configured to generate a plurality of candidate locations for the transmitter based on signal ray characteristics of a plurality of signal rays, the candidate locations being points along an estimated path traversed by the plurality of signal rays from the transmitter to the receiver, calculate, for each candidate location, at least one weighted metric by summing a plurality of location metrics associated with each respective candidate location, and locate the transmitter based on the at least one weighted metric associated with each candidate location. - View Dependent Claims (18, 19, 20)
Specification