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    Direct Digital Synthesizer With Frequency Correction
    62.
    发明申请
    Direct Digital Synthesizer With Frequency Correction 有权

    公开(公告)号：US20220407524A1

    公开(公告)日：2022-12-22

    申请号：US17351529

    申请日：2021-06-18

    Applicant: BAE Systems Information and Electronic Systems Integration Inc.

    Inventor： Shailendra Srinivas ,  Joseph D. Cali ,  Steven E. Turner

    IPC: H03L7/093

    Abstract: A direct digital synthesizer (DDS) circuit. The circuit includes a first input to receive a first fixed frequency clock signal having a first frequency, a second input to receive a second fixed frequency clock signal having a second frequency lower than the first frequency, and an output to provide an output frequency that is based at least in part on a frequency control word (FCW). The DDS circuit may include a frequency correction circuit having a first input to receive the first clock signal, a second input to receive the second clock signal, and a third input to receive the FCW, and an output to provide a frequency error of the first clock signal, the frequency error determined using the second clock signal and FCW. Alternatively, or in addition to, the DDS circuit may include an all-digital phase lock loop to correct for frequency wander of the first clock signal.

    System and method for terminal acquisition with a neural network
    64.
    发明授权
    System and method for terminal acquisition with a neural network 有权

    公开(公告)号：US11521063B1

    公开(公告)日：2022-12-06

    申请号：US16717361

    申请日：2019-12-17

    Applicant: BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC.

    Inventor： Michael J Powers ,  Peter Simonson

    IPC: G06N3/08 ,  G06K9/62 ,  G01D5/30 ,  G01D7/00 ,  G06F17/16

    Abstract: A system and method for reducing laser communication terminal pointing uncertainty. The method trains an artificial neural network (ANN) with input data characterizing terminal pointing error and dependent parameters. The method inputs the trained ANN a set of data of these dependent parameters with unknown pointing error. The method uses the ANN output to apply corrections to the terminal pointing solution to reduce pointing uncertainty. The method can condition the ANN generated corrections to avoid cases where application of the ANN correction could exceed the original pointing uncertainty. This conditioning includes computing the Euclidean distance between current ANN input parameter values and values in the ANN training dataset, and bounding the allowed magnitude of the ANN pointing correction. The method can train the ANN incrementally during terminal operation for real-time updates or train the ANN offline with gathered data and implement the trained ANN on the terminal for subsequent links.

    BROADBAND MICROWAVE AND MILLIMETER-WAVE BALANCED-TO-UNBALANCED TRANSFORMER
    65.
    发明申请
    BROADBAND MICROWAVE AND MILLIMETER-WAVE BALANCED-TO-UNBALANCED TRANSFORMER 有权

    公开(公告)号：US20220385261A1

    公开(公告)日：2022-12-01

    申请号：US17333163

    申请日：2021-05-28

    Applicant: BAE Systems Information and Electronic Systems Integration Inc.

    Inventor： Mark D. Hickle

    IPC: H03H7/42 ,  H01P5/16

    Abstract: Techniques are provided for a broadband microwave/millimeter-wave balanced-to-unbalanced transformer (balun). A balun implementing the techniques according to an embodiment includes a first impedance matching network configured to reduce insertion and return losses of a single-ended signal at a first port of the balun. The balun also includes a first planar bifilar coupled transmission line coupled to the first impedance matching network and configured to transform the single-ended signal into a differential signal. The balun further includes a second planar bifilar coupled transmission line coupled to the first bifilar coupled transmission line and configured to compensate for amplitude and phase imbalance induced on the differential signal by the first bifilar coupled transmission line. The balun further includes a second impedance matching network coupled to both planar bifilar coupled transmission lines and configured to reduce insertion and return losses of the differential signal at second and third ports of the balun.

    ROTATABLE ANTENNA DESIGN FOR UNDERSEA VEHICLES
    68.
    发明申请
    ROTATABLE ANTENNA DESIGN FOR UNDERSEA VEHICLES 有权

    公开(公告)号：US20220344793A1

    公开(公告)日：2022-10-27

    申请号：US17240341

    申请日：2021-04-26

    Applicant: BAE Systems Information and Electronic Systems Integration Inc.

    Inventor： Court E. Rossman ,  Ronald M. Carvalho, JR. ,  John R. Stuart, III ,  Matthew D. Thoren ,  John M. Veilleux ,  Ross J. Wendell

    IPC: H01Q1/04 ,  H01Q1/12 ,  H01Q1/36

    Abstract: An antenna module configured for use on an underwater vehicle is disclosed. The antenna module includes an array of spiral antennas fabricated on a multi-layer substrate that provides wide-band RF communication with direction finding (DF) capability. The antenna module can also include other antennas fabricated on the same multi-layer substrate, such as one or more global positioning system (GPS) receivers, an ultra-high frequency/very-high frequency (UHV/VHF) antenna, or one or more iridium antennas. The antenna module may further include a water-proof housing that is coupled to the outside hull of an undersea vehicle via a coupling mechanism. The coupling mechanism allows the antenna module to rotate between a stowed position against the hull and a deployed position that extends the antennas out away from the undersea vehicle. The antenna module is curved or flexible so it can stow against a corresponding curved hull of the undersea vehicle.

    LASER ILLUMINATION SYSTEM WITH CLOSELY SPACED BEAMS
    69.
    发明申请
    LASER ILLUMINATION SYSTEM WITH CLOSELY SPACED BEAMS 有权

    公开(公告)号：US20220342227A1

    公开(公告)日：2022-10-27

    申请号：US17842913

    申请日：2022-06-17

    Applicant: BAE Systems Information and Electronic Systems Integration Inc.

    Inventor： Daniel N. Kokubun ,  Mark S. Branham ,  Sidney Pang ,  Mark Segawa

    IPC: G02B27/10 ,  G02B27/48

    Abstract: Techniques are provided for laser illumination employing closely spaced laser beams. A system implementing the techniques according to an embodiment includes a semi-cylindrical optical block comprising a curved surface and a planar surface. A first laser source to generate a first laser beam directed to the planar surface, wherein the first laser beam enters the optical block at a first angle that exceeds a critical angle, relative to the planar surface, the critical angle causing total internal reflection, such that the first laser beam is refracted through and exits the optical block. A second laser source to generate a second laser beam directed to the curved surface, wherein the second laser beam enters the optical block at a second angle that exceeds the critical angle, relative to the planar surface, such that the second laser beam is reflected off the planar surface and exits the optical block parallel to the first laser beam exiting from the optical block, the separation based on a location of the entry of the first laser beam into the optical block. The separation of the exiting first and second laser beams is controlled by the selected translation distance.

    Calibration signal generation for a sampling analog to digital converter
    70.
    发明授权
    Calibration signal generation for a sampling analog to digital converter 有权

    公开(公告)号：US11476876B1

    公开(公告)日：2022-10-18

    申请号：US17544210

    申请日：2021-12-07

    Applicant: BAE Systems Information and Electronic Systems Integration Inc.

    Inventor： Richard J. Lavery ,  Peter Ladubec, Jr.

    IPC: H04B17/00 ,  H04B1/00 ,  H04B1/16 ,  H04B17/11 ,  H04B17/21

    Abstract: Techniques are provided for the generation of a calibration signal for use on an analog to digital converter (ADC). A system implementing the techniques according to an embodiment includes a calibration signal generator configured to generate a calibration tone, located in a first frequency band, in response to a calibration enable signal. The system also includes a signal summing circuit configured to generate an ADC input signal as a sum of a received signal and the calibration tone. The received signal is located in a second frequency band. The system further includes an ADC circuit configured to convert the ADC input signal to a baseband digital output signal and to perform self-calibration, based on the calibration tone, in response to the calibration enable signal. The frequency bands and the amplitude of the calibration tone are chosen to reduce interference between the received signal and the calibration tone.

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