Low-cost, low-power geolocation system
First Claim
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1. A method for determining the location of a transmission source, the method comprising the steps of:
- receiving at a plurality of signal receiving locations at least one signal from a transmission source;
determining a signal magnitude of each of the at least one transmission signal received at the plurality of signal receiving locations; and
processing each of the signal magnitudes with a statistical model of the signal propagation characteristics associated with the signal space between the transmission source and each of the receiving locations to determine the location of the transmission source;
wherein the location is at least in part determined by at least one signal magnitude, and by a distance power gradient of the transmission source relative to at least one of the plurality of signal receiving locations.
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Abstract
A system and method for determining the location of a transmission source by processing the magnitude of the transmitted signal received at a plurality of receivers with a statistical model of the signal propagation characteristics associated with the signal space between the source and each of the receivers. The system and method also are capable of determining a route of travel between the transmission source and a receiver and/or alternate location.
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Citations
28 Claims
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1. A method for determining the location of a transmission source, the method comprising the steps of:
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receiving at a plurality of signal receiving locations at least one signal from a transmission source;
determining a signal magnitude of each of the at least one transmission signal received at the plurality of signal receiving locations; and
processing each of the signal magnitudes with a statistical model of the signal propagation characteristics associated with the signal space between the transmission source and each of the receiving locations to determine the location of the transmission source;
wherein the location is at least in part determined by at least one signal magnitude, and by a distance power gradient of the transmission source relative to at least one of the plurality of signal receiving locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for determining the location of a transmission source comprising:
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a transmission source capable of transmitting at least one signal;
a plurality of receivers each capable of receiving the at least one transmitted signal;
a processor capable of determining signal magnitudes of the at least one transmitted signal as received by each of the plurality of receivers and capable of processing each of the signal magnitudes with a statistical model of the signal propagation characteristics associated with the signal space between the transmission source and each of the receiving locations to determine the location of the transmission source;
wherein the location is at least in part determined by at least one signal magnitude, and by a distance power gradient of the transmission source relative to at least one of the plurality of receivers. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system for determining the location of a transmission source, comprising a log likelihood function of the general form:
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wherein x is a location along an X-axis of a Cartesian coordinate system;
y is a location along a Y-axis of a Cartesian coordinate system that is orthogonal to the X-axis;
xn represents an X-axis location of an nth receiver in the Cartesian coordinate system;
yn represents an Y-axis location of an nth receiver in the Cartesian coordinate system;
an is a measured signal strength at the location of the nth receiver;
gn is a distance power gradient of the nth receiver relative to the transmitter;
Pn is a power received by the nth receiver at a location one meter from a transmitter; and
pa/x,y is a likelihood function.
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28. A method for determining the location of a receiver, the method comprising the steps of:
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receiving at a receiver a plurality of signals from a plurality of transmission sources;
determining a signal magnitude of each of the plurality of signals received at the receiver; and
processing each of the signal magnitudes with a statistical model of the signal propagation characteristics associated with the signal space between the receiver and each of the plurality of transmission sources to determine the location of the receiver, wherein the location is at least in part determined by at least one signal magnitude, and by a distance power gradient of the receiver relative to at least one of the plurality of transmission sources.
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Specification