公开(公告)号：US20230033568A1

公开(公告)日：2023-02-02

申请号：US17380772

申请日：2021-07-20

Applicant: RAYTHEON COMPANY

Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

IPC: H04L25/49 ,  H04L27/00

Abstract: A system and method for recovering encoded data from a modulated baseband signal is disclosed. Aspects and embodiments of the system and method include receiving an analog input signal representing a modulated baseband signal, counting clock cycles of a reference clock, detecting a first transition and a second transition of the analog input signal indicating a first change and a second change in the modulated baseband signal, storing a first counter value corresponding to an amount of clock cycles elapsed between the first transition and the second transition, and determining a binary-valued bit sequence corresponding to the first counter value.

公开(公告)号：US11353774B2

公开(公告)日：2022-06-07

申请号：US16929798

申请日：2020-07-15

Applicant: RAYTHEON COMPANY

Inventor： Andrew Kowalevicz ,  Benjamin P. Dolgin ,  Gary M. Graceffo

IPC: G02F2/00 ,  H04B10/556 ,  H04B10/67 ,  H04B10/11 ,  H04B10/516

Abstract: Disclosed are optical communications systems and optical receivers including one or more optical cavity resonators. In particular, disclosed are methods and apparatus that allow for beam pointing to be maintained while permitting the receiver to tune the optical resonator to suit the wavelength, data rate and modulation format of the incoming optical signal, without requiring a coherent receiver or adaptive optics in addition to optical resonators.

公开(公告)号：US11353528B2

公开(公告)日：2022-06-07

申请号：US17204777

申请日：2021-03-17

Applicant: Raytheon Company

Inventor： Joseph J. Fraundorfer ,  Thomas G. Lavedas ,  Benjamin P. Dolgin

IPC: G01R33/44 ,  G01R33/36

Abstract: A system includes a table and a material detection system. The material detection system includes a transmit chain configured to generate first radio frequency (RF) signals and a transmit probe configured to transmit the first RF signals towards an item through open space. The material detection system also includes a receive probe configured to receive second RF signals from the item through open space, where the second RF signals have one or more characteristics indicative of one or more materials within the item. The material detection system further includes a receive chain configured to process the second RF signals and at least one processing device configured to identify the one or more materials within the item using nuclear quadrupole resonance (NQR) spectrometry based on the processed second RF signals. The transmit and receive probes are positioned in an upper portion of the table.

公开(公告)号：US20210399807A1

公开(公告)日：2021-12-23

申请号：US16908558

申请日：2020-06-22

Applicant: Raytheon Company

Inventor： Benjamin P. Dolgin ,  Andrew M. Kowalevicz ,  Gary M. Graceffo

IPC: H04B10/532 ,  G02B6/27 ,  H04B10/50 ,  H04B10/572 ,  H04B10/61

Abstract: An optical transmitter (and methods of transmitting and receiving) includes a delay and modulation circuit configured to receive at least one optical beam and a first data signal (persistent data) and generate at least two or more modulated optical beams having the first data encoded therein. One of the modulated optical beams is a time-delayed or time-shifted version of another one of the modulated optical beams, and both beams are directed toward a target. The amount or time delay between the first and second optical beams can be modulated according to a second data signal (non-persistent data) to encode the second data therein. An optical receiver is configured to detect the two modulated optical beams and recover the first data. Because changes in the amount or time delays between the first and second optical beams results in a positional change in the location of the combined centroid of the received beams at a detector of the receiver, the second data can be recovered by detecting the positional changes.

公开(公告)号：US11201677B1

公开(公告)日：2021-12-14

申请号：US16896022

申请日：2020-06-08

Applicant: Raytheon Company

Inventor： Benjamin P. Dolgin ,  Andrew M. Kowalevicz ,  Gary M. Graceffo

IPC: H04B10/50 ,  H04B10/556 ,  H04B10/54

Abstract: An optical transmitter (and methods of transmitting and receiving) includes a delay and modulation circuit (or communications circuit) configured to receive at least one optical beam and a data signal and generate at least two or more modulated optical beams having the data encoded therein. One of the modulated optical beams is a time-delayed or time-shifted version of another one of the modulated optical beams, and both beams are directed toward a target.

公开(公告)号：US11159245B2

公开(公告)日：2021-10-26

申请号：US16920011

申请日：2020-07-02

Applicant: RAYTHEON COMPANY

Inventor： Andrew Kowalevicz ,  Benjamin P. Dolgin ,  Gary M. Graceffo

IPC: H04B10/61 ,  G02B5/28 ,  H04B10/54 ,  H04B10/64 ,  H04J14/02

Abstract: Apparatus, systems, and methods include leveraging the angular dependence of the angle of arrival of the incoming optical signal at an optical resonator and the output response signal to adjust the operating condition of the optical resonator. The optical resonator is dynamically tuned by rotating the optical resonator to optimize signal-to-noise ratio or other parameters for different modulation formats of the incoming optical signal or other different operating conditions.

公开(公告)号：US20210099234A1

公开(公告)日：2021-04-01

申请号：US17035187

申请日：2020-09-28

Applicant: RAYTHEON COMPANY

Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

IPC: H04B10/60 ,  G02B17/00 ,  G02F1/137

Abstract: An optical receiver includes a photonic integrator configured to accumulate optical signal energy corresponding to the input optical signal during an integration period, and to produce an output optical signal at an end of the integration period, the output optical signal having a higher intensity than the input optical signal, a shutter operable between a closed position and an open position, the shutter configured to prevent the output optical signal from exiting the photonic integrator when in the closed position and to allow the output optical signal to exit the photonic integrator when in the open position, a synchronizer coupled to the shutter and configured to control the shutter between the open position and the closed position; and a photodetector configured to receive the output optical signal when the shutter is in the open position and to produce an electrical signal corresponding to the output optical signal.

公开(公告)号：US20210041515A1

公开(公告)日：2021-02-11

申请号：US16855829

申请日：2020-04-22

Applicant: RAYTHEON COMPANY

Inventor： Benjamin P. Dolgin

IPC: G01R33/36 ,  H01Q7/00 ,  H03H7/42

Abstract: Embodiments of an SLR antenna having differential signal contacts and a tuning circuit configured to tune the at least one resonance frequency of the SLR antenna to a predetermined operational frequency are disclosed. Embodiments of a tuning circuit include a balun transformer connected between the differential signal contacts of the SLR antenna and a single-ended input/output contact, a first variable capacitance connected between the balun transformer and the single-ended input/output contact, and a variable reactive component connected between the differential signal contacts of the SLR antenna and between differential contacts of the balun transformer.

公开(公告)号：US20210021449A1

公开(公告)日：2021-01-21

申请号：US16929916

申请日：2020-07-15

Applicant: RAYTHEON COMPANY

Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

IPC: H04L27/22 ,  H01P7/06 ,  H03H7/00

Abstract: Disclosed is a microwave cavity resonator used as a phase change (phase modulation) to intensity change (intensity or amplitude modulation) converter. Certain aspects and embodiments include resonant circuits, such as a resistor, inductor and capacitor (RLC) circuit. Certain aspects and embodiments convert changes in phase to changes in output voltage to perform analog demodulation of a phase modulated microwave carrier. Certain aspects and embodiments use resonance when the reactive components of the circuit (capacitive and inductive components) are equal in magnitude and 180 degrees out of phase with one another, thereby cancelling out the reactance component of the circuit's impedance.

公开(公告)号：US20210018817A1

公开(公告)日：2021-01-21

申请号：US16903129

申请日：2020-06-16

Applicant: Raytheon Company

Inventor： Andrew M. Kowalevicz ,  Benjamin P. Dolgin ,  Gary M. Graceffo

IPC: G02F2/00 ,  H04B10/67 ,  H04B10/556

Abstract: A demodulator can include an optical resonator. The optical resonator can include a resonant cavity that extends between a first surface that is partially reflective and a second surface that is at least partially reflective. The first surface can receive a phase-modulated optical signal that has a time-varying phase. The resonant cavity can accumulate resonant optical signal energy based at least in part on the phase-modulated optical signal. The first surface can direct a fraction of the resonant optical signal energy out of the optical resonator to form an intensity-modulated optical signal that has a time-varying intensity. A data detector can receive at least a portion of the intensity-modulated optical signal and, in response, generate an intensity-modulated electrical signal that has a time-varying intensity that corresponds to the time-varying phase of the phase-modulated optical signal.