Method and system for tracking and determining a location of a wireless transmission
First Claim
1. A system for determining a location of a device emitting a wireless transmission among a plurality of devices, said system comprising:
- a transmitter transmitting a synchronization signal to the plurality of devices;
at least one receiver system receiving said wireless transmission from said device within a time slot window a predetermined time after said synchronization signal, said predetermined time being assigned to said device, wherein said wireless transmission from said device includes a preamble code of a known length, said preamble code including a code identifying said device, and at least one additional pulse received in a time window a predetermined time after an end of said preamble code; and
a processor;
receiving said at least one additional pulse;
determining a time of receipt of said at least one additional pulse,determining whether said received at least one additional pulse has an amplitude in a range of values determined based on an amplitude of pulses within the preamble code; and
determining the location of the device emitting the wireless transmission based on a location of selected ones of the at least one receiver system receiving said wireless transmission and the determined time of receipt of said at least one additional pulse having an amplitude in said range of values.
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Accused Products
Abstract
An apparatus for detecting and timing a transmitting device is disclosed. The device includes a receiving system receiving a signal containing at least a preamble code of a known length and at least one pulse within a receive window after the preamble code, a circuit receiving the at least one pulse comprising a zero-crossing circuit for indicting a zero-voltage crossing of the at least one pulse and a trigger device for latching the indication of zero-voltage crossing, and a ripple circuit counter, receiving the latched indication of said zero-voltage crossing and associating a time to the receipt of the latched indication. A system for detecting and locating a transmitting device is further disclosed. The system includes a plurality of sensor apparatus each determining a reception time of a signal and a processor for determining a location based on groups of the reception times.
47 Citations
11 Claims
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1. A system for determining a location of a device emitting a wireless transmission among a plurality of devices, said system comprising:
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a transmitter transmitting a synchronization signal to the plurality of devices; at least one receiver system receiving said wireless transmission from said device within a time slot window a predetermined time after said synchronization signal, said predetermined time being assigned to said device, wherein said wireless transmission from said device includes a preamble code of a known length, said preamble code including a code identifying said device, and at least one additional pulse received in a time window a predetermined time after an end of said preamble code; and a processor; receiving said at least one additional pulse; determining a time of receipt of said at least one additional pulse, determining whether said received at least one additional pulse has an amplitude in a range of values determined based on an amplitude of pulses within the preamble code; and determining the location of the device emitting the wireless transmission based on a location of selected ones of the at least one receiver system receiving said wireless transmission and the determined time of receipt of said at least one additional pulse having an amplitude in said range of values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification