Transmitter location for ultra-wideband, transmitted-reference CDMA communication system
First Claim
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1. A method for determining a location of at least one transmitting object within an area of interest, comprising:
- transmitting wireless signals from a plurality of transmitting objects to at least three receivers;
transmitting signals from a plurality of beacon transmitters to the at least three receivers, each of said plurality of beacon transmitters being at a known location and having an independent local clock;
calculating, at each of the at least three receivers, a plurality of time differences of arrival data based on respective signals from said plurality of beacon transmitters and the wireless signals transmitted from the plurality of transmitting objects; and
determining the location of the at least one of the plurality of transmitting objects within said area of interest based on said plurality of time differences of arrival data from said at least three receivers.
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Abstract
A system and method involve determining the location of objects within an area of interest using wireless signals. The system includes at least three base stations communicating with a central processor and a plurality of mobile devices. Further, at least one fixed beacon transmitter of known location may be provided. The mobile devices transmit a wireless signal to the base stations, which then determine a location of the mobile devices based on time difference of arrival information between the mobile devices measured at all the base stations.
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Citations
22 Claims
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1. A method for determining a location of at least one transmitting object within an area of interest, comprising:
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transmitting wireless signals from a plurality of transmitting objects to at least three receivers; transmitting signals from a plurality of beacon transmitters to the at least three receivers, each of said plurality of beacon transmitters being at a known location and having an independent local clock; calculating, at each of the at least three receivers, a plurality of time differences of arrival data based on respective signals from said plurality of beacon transmitters and the wireless signals transmitted from the plurality of transmitting objects; and determining the location of the at least one of the plurality of transmitting objects within said area of interest based on said plurality of time differences of arrival data from said at least three receivers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining a location of an object within an area of interest, comprising:
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a mobile device carried by each of a plurality of objects, said mobile device including a transmitter for transmitting a wireless signal, the wireless signal comprising a TD/DH UWB (transmitted-reference, delayed hopped ultra-wide band) RF signal; at least three base stations within said area of interest, each of said at least three base stations comprising a detector for detecting wireless signals transmitted from a plurality of said mobile devices, and further comprising a processor for deriving time difference of arrival information based on the detected wireless signals, the detector comprising a pulse-pair correlator; and a controller for determining the location of at least one of the objects within said area of interest based on the time difference of arrival information calculated by each of the three base stations. - View Dependent Claims (13, 14, 15, 16)
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17. A method for determining a location of a transmitting object within an area of interest, comprising:
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receiving a plurality of wireless signals from a plurality of transmitting objects, the plurality of wireless signals received by at least three receivers, the signals comprising pair of pulses separated by a time interval D; and determining the location of least one of the transmitting objects within said area of interest based on time difference of arrival information calculated at each of the at least three receivers, said calculation of the time difference of arrival information based on the plurality of wireless signals delayed by the time interval D. - View Dependent Claims (19, 20)
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18. A system for determining a location of an object within an area of interest, comprising:
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a mobile device carried by each of a plurality of objects, said mobile device including a transmitter for transmitting a wireless signal; at least three base stations within said area of interest, each of said at least three base stations comprising a detector for detecting wireless signals transmitted from the plurality of said objects each carrying said mobile device, the detector comprising a pulse-pair correlator and each of said at least three base stations further comprising a processor for deriving time difference of arrival information based on the detected wireless signals; and a controller for determining the location of at least one of the plurality of objects within said area of interest based on the time difference of arrival information calculated by each of the three base stations. - View Dependent Claims (21, 22)
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Specification