Patents Assigned to Coherent Technologies
  • Patent number: 9444514
    Abstract: Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using OTFS pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy OTFS data transmission methods.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: September 13, 2016
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib
  • Patent number: 9316534
    Abstract: A reconfigurable photonic integrated circuit focal plane array (RPIC-FPA) includes detectors and photonic integrated circuit coupled to the detectors that are configured to mix a return signal beam with local oscillator (LO) beams to produce a combined beam and direct the combined beam to the detectors. The LO beams have reconfigurable optical properties enabled by the RPIC-FPA. The LO beams are individually addressed to switch the detectors between a direct detection mode and various coherent detection modes based on adjustments to the optical properties of the LO beams. In the coherent detection mode, the controller is configured to mix the return signal beam with the LO beam having adjusted optical properties to produce the combined beam, and, in the direct detection mode, the controller is configured to disable the LO beams based on adjustments to the optical properties and to direct the return signal beam to the detectors without mixing.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: April 19, 2016
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Piotr Konrad Kondratko, Philip Gatt, John Glennon, Brian Carroll Redman, Paul Suni
  • Patent number: 9294315
    Abstract: A method of data transmission including arranging a set of data elements into an original data frame having a first dimension of N elements and a second dimension of N elements, where N is greater than one. The method includes transforming the original data frame in accordance with a transformation matrix to form a first transformed data matrix having at least N2 transformed data elements wherein each of the transformed data elements is based upon a plurality of the data elements of the original data frame and wherein a first dimension of the first transformed data matrix corresponds to a frequency shift axis and a second dimension corresponds to a time shift axis. A permuted data matrix is formed by permuting at least a portion of the elements of the first transformed data matrix so as to shift the at least a portion of the elements with respect to the time shift axis.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: March 22, 2016
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Selim Shlomo Rakib
  • Patent number: 9207322
    Abstract: A compact LIDAR pointing assembly can comprise a body, first and second ferrules, and a clip component that can be used to maintain an engagement between the first and second ferrules and an alignment of light emanating from the first and second ferrules relative to received light propagating along an optical axis of the assembly. The ferrules can be pivoted to adjust the orientation of the light emanating from the ferrules.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: December 8, 2015
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: David Hwang, Jesse William Fisher
  • Patent number: 9130638
    Abstract: A method of receiving data including receiving, on one or more carrier waveforms, signals representing a plurality of data elements of an original data frame wherein each of the data elements are represented by cyclically time shifted and cyclically frequency shifted versions of a known set of waveforms. The method further includes generating, based upon the signals, a received data frame and generating an equalized data frame by performing an equalization operation using elements of the received data frame, the equalization operation correcting for distortion introduced into the signals during propagation of the carrier waveforms through a channel.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: September 8, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Salim Shlomo Rakib
  • Patent number: 9083483
    Abstract: A wireless combination time, frequency and spectral shaping communications method that transmits data in convolution unit matrices (data frames) of N×N (N2), where generally either all N2 data symbols are received over N spreading time intervals (each composed of N time slices), or none are. To transmit, the N2 sized data frame matrix is multiplied by a first N×N time-frequency shifting matrix, permuted, and then multiplied by a second N×N spectral shaping matrix, thereby mixing each data symbol across the entire resulting N×N matrix (TFSSS data matrix). Columns from this N2 TFSSS data matrix are selected, modulated, and transmitted, on a one element per time slice basis. At the receiver, the replica TFSSS matrix is reconstructed and deconvoluted, revealing the data. The method can accommodate multiple users at once, can adapt to changing channel conditions, and is particularly useful for coping with channel impairments such as Doppler shifts.
    Type: Grant
    Filed: July 27, 2014
    Date of Patent: July 14, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Shlomo Selim Rakib, Ronny Hadani
  • Patent number: 9083595
    Abstract: A method of modulating communications signals, such as optical fiber, wired electronic, or wireless signals in a manner that facilitates automatic correction for the signal distortion effects of echoes and frequency shifts, while still allowing high rates of data transmission. Data symbols intended for transmission are distributed into N×N matrices, and used to weigh or modulate a family of cyclically time shifted and cyclically frequency shifted waveforms. Although these waveforms may then be distorted during transmission, their basic cyclic time and frequency repeating structure facilitates use of improved receivers with deconvolution devices that can utilize the repeating patterns to correct for these distortions. The various waveforms may be sent in N time blocks at various time spacing and frequency spacing combinations in a manner that can allow interleaving of blocks from different transmitters. Applications to channel sounding/characterization, system optimization, and also radar are also discussed.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: July 14, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Shlomo Selim Rakib, Ronny Hadani
  • Patent number: 9071286
    Abstract: A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 30, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Salim Shlomo Rakib
  • Patent number: 9071285
    Abstract: A system and method of providing a modulated signal useable in a signal transmission system. The method includes transforming, perhaps with respect to both time and frequency, a data frame including a plurality of data elements into a transformed data matrix. The transformed data matrix includes a plurality of transformed data elements where each of the plurality of transformed data elements is based upon each of the plurality of data elements. The method further includes generating the modulated signal in accordance with the transformed data elements of the transformed data matrix.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 30, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Salim Shlomo Rakib
  • Patent number: 9031141
    Abstract: A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: May 12, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Salim Shlomo Rakib
  • Patent number: 8976851
    Abstract: A method which includes receiving a first modulated signal from a first user device, the first modulated signal being generated based upon a time-frequency transformation of first user data. The method further includes receiving a second modulated signal from a second user device, the second modulated signal being generated based upon a time-frequency transformation of second user data. The first modulated signal and the second modulated signal are then processed.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: March 10, 2015
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Salim Shlomo Rakib
  • Patent number: 8654316
    Abstract: Various aspects of the disclosure provide a target system that is small and low power. In one embodiment, the target system transmits an intensity modulated light beam to a target (which may be tagged with a fluorescent taggant), collects the resulting return light from the target, and separates out elastic light scatter and fluorescent light in the collected light. The intensities of the elastic light scatter and the fluorescent light are then separately detected by first and second photodetectors, respectively. The first photodetector generates an elastic scatter detection signal based on the detected elastic light scatter and the second photodetector generates a fluorescent detection signal based on the detected fluorescent light. The elastic scatter detection signal and/or the fluorescent detection signal are used to provide one or more of the following functions: 1) target detection, 2) range determination, 3) taggant detection, and 4) taggant discrimination/confirmation.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: February 18, 2014
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventor: John J. Glennon
  • Patent number: 8309900
    Abstract: A combined active and passive imaging system comprises a radiation sources configured to output radiation beams towards a detector and an object in a scene. The system further comprises the detector configured to record superposition of instances of intensity patterns of interferences between at least a portion of the radiation beams and at least a portion of return radiations from the object. The detector may further be configured to record ambient light reflected from the scene. The detector may output a first signal with the recorded ambient light reflected from the scene and a second signal with the recorded superposition. The system further comprises a processor communicatively coupled to the detector and the radiation source unit. The processor may receive the first signal and the second signal and select the object in the scene.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: November 13, 2012
    Assignee: Lockheed Martin Coherent Technologies, Inc
    Inventor: Joseph C. Marron
  • Patent number: 8227735
    Abstract: A combined active and passive imaging system comprises a radiation source unit configured to output a radiation beam towards a detector and an object in a scene. The system further comprises the detector configured to record a first instance of an intensity pattern of an interference between at least a portion of the radiation beam and at least a portion of a return radiation from the object. The detector may further be configured to record ambient light reflected from the scene. The detector may output a first signal with the recorded ambient light reflected from the scene and a second signal with the recorded intensity pattern. The system further comprises a processor communicatively coupled to the detector and the radiation source unit. The processor may receive the first signal and the second signal and select the object in the scene.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: July 24, 2012
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventor: Joseph C. Marron
  • Patent number: 8188418
    Abstract: Embodiments of the present invention provide a switchable dual-mode detection system that can be electronically or optically switched between direct and coherent detection. The dual-mode detection system comprises a photo detector and one or more switching elements used in conjunction with the photo detector to electronically or optically switch the detection system between direct and coherent detection. The switching elements may include a switchable detector driver that selectively biases the photo detector into a low gain mode for coherent detection and a high gain mode for direct detection, and/or a switchable optical subsystem that selectively mixes a local oscillator beam with the input signal beam for coherent detection and not for direct detection, and/or an amplifier switch that selectively directs the output photo current of the photo detector to one of two amplifiers, where one of the amplifiers is optimized for direct detection and the other for coherent detection.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: May 29, 2012
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Piotr K. Kondratko, Paul J. M. Suni
  • Patent number: 8078410
    Abstract: Provided herein are systems and methods capable of detecting and discriminating and/or classifying hazardous biological agents or other hazardous agents. In one aspect, a system measures electromagnetic energy scattered by a material at the different polarizations states and wavelengths. The system then combines the measured electromagnetic wavelengths at the different polarization states and wavelengths into different combinations to produce input parameters for a classifier. The input parameters include both depolarization and wavelength-dependent elastic backscatter measurements of the material illuminated by transmitted electromagnetic energy. The combination of wavelength dependent depolarization measurements and wavelength dependent backscatter measurements provides a unique capability to classify (or discriminate) based on size, shape, and refractive index.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: December 13, 2011
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: John H. Marquardt, Tahllee Baynard
  • Patent number: 7986397
    Abstract: A method for frequency modulated continuous wave LADAR imaging is provided. The method comprises the steps of generating a chirped laser signal and a constant-frequency laser signal, forming a target laser signal from the chirped laser signal and the constant-frequency laser signal and forming a local oscillator laser signal from the chirped laser signal and the constant-frequency laser signal. The method further comprises delaying or frequency shifting the local oscillator laser signal and directing the target laser signal to a target. The method further comprises combining a returned signal received from the target with the delayed or frequency shifted local oscillator laser signal to form a combined received signal, and capturing the combined received signal with a plurality of image sensors.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: July 26, 2011
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Bruce G. Tiemann, Brian Krause
  • Patent number: 7817688
    Abstract: A controller, such as a programmable logic controller, may manipulate a phase and/or polarization module to alter and/or control the phase and polarization of input beams. Utilizing active phase and polarization control can enable the combination of any arbitrary number of input beams into a single, combined beam. Utilizing active phase and polarization control can also enable the combination of input beams having arbitrary power levels.
    Type: Grant
    Filed: January 22, 2009
    Date of Patent: October 19, 2010
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Radoslaw J. Uberna, Bruce G. Tiemann, Andrew T. Bratcher
  • Patent number: 7583711
    Abstract: Method and apparatus are disclosed that enable lasers to be stabilized in absolute frequency to high precision. The principle of operation is to: 1) lock the laser frequency to an etalon transmission resonance, 2) phase modulate the laser beam at a frequency corresponding to the free spectral range of the etalon and lock the phase modulated sidebands to the etalon resonances, and 3) lock the etalon free spectral range frequency to a stable reference frequency derived from, e.g., a stable crystal oscillator. The result is that the laser frequency is locked to an integer multiple of the reference frequency. The invention has applicability to numerous situations where a stable frequency must be provided at a specific value, and has further applicability to stabilizing multiple lasers in different locations to the same value.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: September 1, 2009
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventor: Bruce Tiemann
  • Patent number: 7551656
    Abstract: An optical assembly with mounting provided to effectively transfer heat away from an optic, such as a slab or waveguide amplifier or laser disk, while limiting internal stresses. The assembly includes an optic with a planar surface. A heat sink is positioned in the assembly with an upper surface next to the planar surface of the optic. The upper surface of the heat sink comprises a recessed surface defining a reservoir for containing a compliant heat transfer material. The assembly may further include a volume of the heat transfer material, such as a liquid metal or thermally conductive gel, in the reservoir of the heat sink. In one embodiment, the optic is a slab amplifier with a reflective coating or layer that directly contacts the heat transfer material in the heat sink reservoir or a foil or membrane is provided between the heat transfer material and the slab.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: June 23, 2009
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Glenn Bennett, Michael Robert Browning, Mark Jon Kukla, Steven Craig Palomino, Lawrence Francis Rubin, Dane Lewis Schnal