PHOTONIC INTEGRATED CIRCUIT-BASED COHERENTLY PHASED ARRAY LASER TRANSMITTER

    公开(公告)号:US20220244578A1

    公开(公告)日:2022-08-04

    申请号:US17162860

    申请日:2021-01-29

    Abstract: An apparatus includes a photonic integrated circuit, which includes at least one splitter configured to split at least one input beam into multiple input beamlets and multiple phase modulators configured to phase-shift at least some of the input beamlets. The apparatus also includes an array of optical amplifiers configured to amplify the phase-shifted input beamlets and generate amplified beamlets. The apparatus further incudes a beam combiner configured to combine the amplified beamlets and generate an output beam. In addition, the apparatus includes a controller configured to control the phase modulators in order to adjust phasing of the phase-shifted input beamlets.

    DIRECTION-FINDING AMBIGUITY RESOLUTION IN LONG BASELINE INTERFEROMETERS USING RANDOM FOREST REGRESSION

    公开(公告)号:US20250164596A1

    公开(公告)日:2025-05-22

    申请号:US18512900

    申请日:2023-11-17

    Inventor: Carl A. Nardell

    Abstract: An apparatus includes multiple antennas each configured to receive one or more incoming signals. The apparatus also includes at least one processing device configured to receive antenna measurements associated with the one or more incoming signals, where the antenna measurements include phase measurements associated with the one or more incoming signals. The at least one processing device is also configured to process the antenna measurements using multiple decision trees of a random forest regressor, where the decision trees are configured to generate multiple initial predictions of an angle of arrival associated with the one or more incoming signals. In addition, the at least one processing device is configured to combine the initial predictions in order to generate a final prediction of the angle of arrival associated with the one or more incoming signals.

    VIDEO PORT AUTHENTICATION FOR MULTI-LEVEL SECURITY DEVICES

    公开(公告)号:US20250159107A1

    公开(公告)日:2025-05-15

    申请号:US18941619

    申请日:2024-11-08

    Abstract: A video receiver receives a security level of a video source. The security level is stored in a blanking region of a video transmission. The video receiver compares the security level of the video transmission with a security level stored in the video receiver. The video transmission is processed as a function of the comparison of the security level of the video transmission with the security level of the video receiver.

    Iterative ADC and DAC calibration

    公开(公告)号:US12301245B2

    公开(公告)日:2025-05-13

    申请号:US18114900

    申请日:2023-02-27

    Abstract: A circuit and method for calibrating ADCs and DACs generates a calibration signal by a DAC; filters spurs from the calibration signal from the DAC to generate a filtered calibration signal; calculates ADC interleave calibration factors to improve performance metrics of the ADC, responsive to the filtered calibration signal; receives the calibration signal from the DAC and calculates DAC interleave calibration factors; generates a calibration signal with improved performance metrics, responsive to the DAC interleave calibration factors received from the ADC; and repeats the process until the performance of the ADC and DAC are within a predetermined range.

    Control surface locking system for tactical flight vehicle

    公开(公告)号:US12296942B2

    公开(公告)日:2025-05-13

    申请号:US17929127

    申请日:2022-09-01

    Abstract: A control surface restraining system for variably preventing movement of a control surface imparted by a control actuation shaft of a control actuation section of a tactical flight vehicle includes a power take-off shaft operably connected to the control actuation shaft with a power take-off gear train and a control surface restraint. The control surface restraint is configured to variably engage the power take-off shaft, thereby locking the power take-off gear train and preventing the control actuation shaft from imparting the movement of the control surface. The control surface restraint is also configured to variably disengage the power take-off shaft, thereby unlocking power take-off gear train and allowing the control actuation shaft from imparting the movement of the control surface.

    Athermal infrared optical telescope and method for manufacturing

    公开(公告)号:US12292547B2

    公开(公告)日:2025-05-06

    申请号:US17207350

    申请日:2021-03-19

    Abstract: A device includes an entrance pupil configured to receive light from a distant source. The device also includes an exit pupil configured to output the light to at least one component of an imaging system. The device further includes a plurality of lenses disposed optically between the entrance pupil and the exit pupil, where the lenses are grouped into an objective group and an eyepiece group. In addition, the device includes a housing surrounding the lenses and formed of a housing material. The lenses are formed of one or more lens materials selected based on a thermo-optical coefficient of the one or more lens materials and a coefficient of thermal expansion (CTE) of the housing material. The lens materials can be selected to have a thermo-optical coefficient that is closest to the CTE of the housing material among thermo-optical coefficients of a plurality of possible lens materials.

    Wireless mapping in real-time using correlative passive receiver

    公开(公告)号:US12292526B2

    公开(公告)日:2025-05-06

    申请号:US17825902

    申请日:2022-05-26

    Inventor: Vahid Ataie

    Abstract: Systems and methods for mapping location and characteristics about wireless emitters are described. The systems and methods advantageously use correlative receivers for observing the emissions from the wireless emitters without decrypting or decoding information included in the emissions from the wireless emitters to allow for tracking location and emitter class and type in real-time. The real-time geolocation and emitter class information for many receivers in a geographic area can be determined and overlaid on a map, for example.

    Lightweight, thermally stable disk for a coaxial travelling wave tube (CoTWT)

    公开(公告)号:US12278079B1

    公开(公告)日:2025-04-15

    申请号:US17836626

    申请日:2022-06-09

    Inventor: David R. Sar

    Abstract: A lightweight, thermally stable disk for use in a slow wave structure (SWS) of CoTWT is configurated without sacrificing thermal management, structural integrity, or RF performance. Refractory metal is removed from regions of the disk where no RF interaction is expected and replaced with resistive ceramic material. The disk includes one or more central ribs positioned about the periphery of a central hub. A plurality of U-shaped receptacles may extend from the one or more central ribs. The disk is plated with a patterned metal to define laminar conductive tabs spaced around the periphery that are separated by solid resistive ceramic tabs and to electromagnetically connect all exposed refractory metal surfaces. The plating metal must be capable of being deposited and patterned in a thin layer of 10 to 100 microns, exhibit a Young's Modulus of

    Optical window with integrated temperature sensing

    公开(公告)号:US12274044B2

    公开(公告)日:2025-04-08

    申请号:US18369573

    申请日:2023-09-18

    Abstract: A method of controlling a temperature profile of an optical window comprising: measuring a temperature-dependent electrical property of a thermally sensitive material included in the optical window using an embedded electromagnetic interference shield in the optical window to determine the temperature profile of the optical window, the embedded electromagnetic interference shield including a two-dimensional array of electrically conductive wires; and based on the measurements, selectively biasing at least one wire of the two-dimensional array of electrically conductive wires to locally alter the temperature-dependent electrical property of the thermally sensitive material in at least one selected spatial region of the optical window to control the temperature profile of the optical window.

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