General Atomics, Inc.

Other

David S Furuno

Gerald D Rogerson

Michael L Walker

Stephan Walter Gehring

Jason Ellis

Roberto Aiello

Naiel K Askar

Michael Dale Perry

Jaya L Jeyaseelan

James Laurence Taylor

Susan C Lin

Venkatagopal Racherla

Orville D Means

Robert W LeClair

A sensor network having a first command center and a first access node, comprising a wireless transceiver, coupled to the command center. The sensor network may also include a plurality of nodes individually comprising a wireless transceiver and a directional antenna, wherein each of the plurality of nodes is successively located in a downlink direction relative to the first access node, and is configured to wirelessly communicate via the directional antenna with at least one node of a first neighbor group in a first direction and at least one node of a second neighbor group in a second direction. In addition, a sensor device is individually coupled to at least one of the nodes, and is configured to provide sensor data for the first command center.

Method and system for network setup and maintenance and medium access control for a wireless sensor network

A method of data transmission according to one embodiment of the invention includes encoding a set of data values to produce a corresponding series of ordered n-tuples. The method also includes transmitting, according to the series of ordered n-tuples, a plurality of bursts over a plurality n of frequency bands. Specifically, for each of the plurality of bursts, a frequency band occupied by the burst is indicated by the order within its n-tuple of an element corresponding to the burst. A bandwidth of at least one of the plurality of bursts is at least two percent of the center frequency of the burst. Information is encoded into a polarity of at least one of the plurality of bursts.

Method and apparatus for data transfer using a time division multiple frequency scheme supplemented with polarity modulation

A method of data transmission according to one embodiment of the invention includes encoding a set of data values to produce a corresponding series of ordered n-tuples. The method also includes transmitting, according to the series of ordered n-tuples, a plurality of bursts over a plurality n of frequency bands. Specifically, for each of the plurality of bursts, a frequency band occupied by the burst is indicated by the order within its n-tuple of an element corresponding to the burst. A bandwidth of at least one of the plurality of bursts is at least two percent of the center frequency of the burst. Information is encoded into an additional modulation, e.g., amplitude, width or polarization modulation, of at least one of the plurality of bursts.

Method and apparatus for data transfer using a time division multiple frequency scheme with additional modulation

A method of data transmission according to one embodiment of the invention includes transmitting a plurality of bursts to transmit data, each burst occupying at least one of a plurality of frequency bands. Specifically, a bandwidth of at least one of the plurality of bursts is at least two percent of the center frequency of the burst. In one preferred embodiment, a bandwidth of at least one of the plurality of bursts is at least 100 MHz. In another preferred embodiment, each burst occupies at least one of the plurality of frequency bands, but less than all of the plurality of frequency bands.

Method and apparatus for data transfer using wideband bursts

A method and apparatus for operation in a multi-frequency band system in the presence of an interference, the method comprising the steps of: receiving signaling in a plurality of wideband frequency sub-bands, each wideband frequency sub-band having a different center frequency, wherein a bandwidth of each wideband frequency sub-band is at least 2 percent of a center frequency of the wideband frequency sub-band; detecting an interfering signal having signal energy in a portion of a respective sub-band of the wideband frequency sub-bands; deciding to discontinue use of the respective sub-band; and instructing a transmitting device transmitting the signaling to transmit subsequent signaling in any except the respective sub-band of the plurality of wideband frequency sub-bands.

Method and apparatus for adapting multi-band ultra-wideband signaling to interference sources

Methods and apparatus are provided for radar systems using multiple pulses that are shorter than the expected range delay extent of the target to be imaged. In one implementation, a method for performing radar includes the steps of: transmitting a plurality of pulses, each pulse having a different center frequency and a time duration shorter than an expected range delay extent of a target, wherein a total bandwidth is defined by a bandwidth occupied by the plurality of pulses; receiving reflections of the plurality of pulses; and performing pulse compression on the received pulse reflections to generate a detection signal having a radar resolution approximately equivalent to the transmission and reception of a single pulse having the total bandwidth. In preferred form, the pulses comprise ultrawideband (UWB) pulses each occupying a sub-band of the overall system bandwidth.

Ultra-wideband radar system using sub-band coded pulses

A method of data transmission according to one embodiment of the invention includes encoding a set of data values to produce a corresponding series of ordered n-tuples. The method also includes transmitting, according to the series of ordered n-tuples, a plurality of bursts over a plurality n of frequency bands. Specifically, for each of the plurality of bursts, a frequency band occupied by the burst is indicated by the order within its n-tuple of an element corresponding to the burst. A bandwidth of at least one of the plurality of bursts is at least two percent of the center frequency of the burst.

Method and apparatus for data transfer using a time division multiple frequency scheme

A filter inspection system for inspecting filters comprising a support frame for supporting a substantially tubular filter having inner and outer surfaces for rotation about its axis, a source of EMR for directing radiation along one of the inner and outer surfaces of a filter, an EMR sensing unit mounted adjacent to the other of the surfaces for sensing EMR passing through the filter and generating a signal, and an indicator responsive to the signal for indicating the existence of and the location of passage of EMR through the filter.

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San Diego, CA, United States of America

David S Furuno