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US 2004/0070534 A1Published application
Urban terrain geolocation system
AssigneeInformation Systems Laboratories, Inc.
InventorsJ. Doss Halsey, Douglas J. Wolff
Life of this patent
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AssigneeInformation Systems Laboratories, Inc.
InventorsJ. Doss Halsey, Douglas J. Wolff
Estimating the term…
A system for tracking a moveable object such as a soldier in an urban environment includes a receiver that is positioned on the movable object and a plurality of signal transmitters. The transmitters are mutually dispersed at known locations within the urban environment and each transmitter is configured to generate a low frequency electromagnetic signal capable of penetrating into buildings in the urban environment. At the receiver, phase related information and the receiver location information are extracted from received signals and used to determine the location of the receiver. Phase related ambiguities can be eliminated by a processor to find the real receiver position using an algorithm such as the maximum likelihood method (MLM) algorithm. Once the real receiver position is calculated, it can be transmitted to a central location using a low probability of intercept (LPI) waveform to prevent hostile parties from intercepting the location of the soldier.
A system for locating a moveable target in an urban area, wherein the area is characterized by a feature size, said system comprising:
A system for locating a moveable target in a structure within an urban area, said system comprising:
A method for locating a moveable target in a structure within an urban area, said method comprising the steps of:
Dependencies are inferred from the claim text.