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    Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System
    1.
    发明申请
    Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System 审中-公开
    相位优化恒信号传输（POCET）方法，装置和系统

    公开(公告)号：US20150063427A1

    公开(公告)日：2015-03-05

    申请号：US14325159

    申请日：2014-07-07

    Applicant: THE AEROSPACE CORPORATION

    Inventor： Charles Robert Cahn ,  Philip A. Dafesh

    IPC: H04B1/707 ,  H04L27/12 ,  H04B1/04

    CPC classification number: H04B1/7097 ,  G01S19/02 ,  H04B1/0475 ,  H04B1/707 ,  H04B1/7103 ,  H04B2001/0491 ,  H04B2201/70706 ,  H04B2201/709709 ,  H04J13/0003 ,  H04L23/02 ,  H04L27/12 ,  H04L27/2007

    Abstract: An apparatus and method for generating a composite signal includes electronics configured to modulate a carrier utilizing a finite set of composite signal phases to generate a composite signal, the finite set of composite signal phases being determined through an optimization process that minimizes a constant envelope for the phase modulated carrier, subject to constraints on desired signal power levels of the signals to be combined and either zero or one or more relative phase relationships between the signals. The apparatus and method can be extended to generating an optimized composite signal of different frequencies.

    Abstract translation: 一种用于产生复合信号的装置和方法包括被配置为利用有限组的复合信号相位来调制载波以产生复合信号的电子装置，通过优化过程来确定复合信号相位的有限集合，该最优化过程最小化用于 受到要组合的信号的期望信号功率电平的约束以及信号之间的零或一个或多个相对相位关系的相位调制载波。 该装置和方法可以扩展到生成不同频率的优化复合信号。

    Systems and methods for detecting a communication anomaly
    2.
    发明授权
    Systems and methods for detecting a communication anomaly 有权

    公开(公告)号：US11700270B2

    公开(公告)日：2023-07-11

    申请号：US16279591

    申请日：2019-02-19

    Applicant: THE AEROSPACE CORPORATION

    Inventor： Mohammad Mozumdar ,  Philip A. Dafesh

    IPC: H04L9/40 ,  G06N20/00 ,  G06F13/42

    CPC classification number: H04L63/1425 ,  G06F13/4282 ,  G06N20/00 ,  H04L63/1416

    Abstract: Cyberattacks are rampant and can play a major role in modern warfare, particularly on a widely adopted platforms such as the MIL-STD-1553 standard. To protect a 1553 communication bus system from attacks, a trained statistical or machine learning model can be used to monitor commands from a bus controller of the 1553 communication bus system. The statistical and/or machine learning model can be trained to recognize communication anomalies based at least on the probability distribution of patterns of one or more commands. The statistical model can be stochastic model such as a Markov chain that describes a sequence of possible commands in which the probability of each command depends on the occurrence of a group of one or more commands.

    SYSTEMS AND METHODS FOR DETECTING A COMMUNICATION ANOMALY
    3.
    发明申请
    SYSTEMS AND METHODS FOR DETECTING A COMMUNICATION ANOMALY 审中-公开

    公开(公告)号：US20200267171A1

    公开(公告)日：2020-08-20

    申请号：US16279591

    申请日：2019-02-19

    Applicant: THE AEROSPACE CORPORATION

    Inventor： Mohammad Mozumdar ,  Philip A. Dafesh

    IPC: H04L29/06 ,  G06F13/42 ,  G06N20/00

    Abstract: Cyberattacks are rampant and can play a major role in modern warfare, particularly on a widely adopted platforms such as the MIL-STD-1553 standard. To protect a 1553 communication bus system from attacks, a trained statistical or machine learning model can be used to monitor commands from a bus controller of the 1553 communication bus system. The statistical and/or machine learning model can be trained to recognize communication anomalies based at least on the probability distribution of patterns of one or more commands. The statistical model can be stochastic model such as a Markov chain that describes a sequence of possible commands in which the probability of each command depends on the occurrence of a group of one or more commands.

    CIRCUITS AND METHODS FOR REDUCING AN INTERFERENCE SIGNAL THAT SPECTRALLY OVERLAPS A DESIRED SIGNAL
    4.
    发明公开
    CIRCUITS AND METHODS FOR REDUCING AN INTERFERENCE SIGNAL THAT SPECTRALLY OVERLAPS A DESIRED SIGNAL 审中-公开

    公开(公告)号：US20230261693A1

    公开(公告)日：2023-08-17

    申请号：US18165594

    申请日：2023-02-07

    Applicant: The Aerospace Corporation

    Inventor： Philip A. Dafesh ,  Phillip Brian Hess ,  Gourav K. Khadge

    IPC: H04B1/7107 ,  H04B1/10 ,  H04B1/719

    CPC classification number: H04B1/7107 ,  H04B1/1027 ,  H04B1/1036 ,  H04B1/719

    Abstract: Provided herein are circuits and methods for processing samples of a received in-phase and quadrature (I/Q) domain signal that includes a desired signal and an interference signal that spectrally overlaps the desired signal. In the I/Q domain, a first contribution to the interference signal is removed from the samples using a first algorithm to generate first processed signal samples. Amplitudes and phases of the first processed signal samples are obtained. In an amplitude domain, a second contribution to the interference signal is removed from the amplitudes of the first processed signal samples using a second algorithm to generate second processed signal samples. A signal quality metric of the second processed signal samples is obtained. Based on the signal quality metric of the second processed signal samples, one or more parameters of the first or second algorithm are adjusted to improve the signal quality metric of the second processed signal samples.

    CIRCUITS AND METHODS FOR REDUCING AN INTERFERENCE SIGNAL THAT SPECTRALLY OVERLAPS A DESIRED SIGNAL
    5.
    发明申请
    CIRCUITS AND METHODS FOR REDUCING AN INTERFERENCE SIGNAL THAT SPECTRALLY OVERLAPS A DESIRED SIGNAL 有权

    公开(公告)号：US20210376878A1

    公开(公告)日：2021-12-02

    申请号：US17398992

    申请日：2021-08-10

    Applicant: The Aerospace Corporation

    Inventor： Philip A. Dafesh ,  Phillip Brian Hess

    IPC: H04B1/7107 ,  H04B1/10 ,  H04B1/719

    Abstract: Under one aspect, a method is provided for processing a received signal, the received signal including a desired signal and an interference signal that spectrally overlaps the desired signal. The method can include obtaining an amplitude of the received signal. The method also can include obtaining an average amplitude of the received signal based on at least one prior amplitude of the received signal. The method also can include subtracting the amplitude from the average amplitude to obtain an amplitude residual. The method also can include, based upon an absolute value of the amplitude residual being less than or equal to a first threshold, inputting the received signal into an interference suppression algorithm so as to generate a first output including the desired signal with reduced contribution from the interference signal.

    Circuits and methods for reducing an interference signal that spectrally overlaps a desired signal
    7.
    发明授权
    Circuits and methods for reducing an interference signal that spectrally overlaps a desired signal 有权

    公开(公告)号：US12149278B2

    公开(公告)日：2024-11-19

    申请号：US18165594

    申请日：2023-02-07

    Applicant: The Aerospace Corporation

    Inventor： Philip A. Dafesh ,  Phillip Brian Hess ,  Gourav K. Khadge

    IPC: H04B1/00 ,  H04B1/10 ,  H04B1/7107 ,  H04B1/719

    Abstract: Provided herein are circuits and methods for processing samples of a received in-phase and quadrature (I/Q) domain signal that includes a desired signal and an interference signal that spectrally overlaps the desired signal. In the I/Q domain, a first contribution to the interference signal is removed from the samples using a first algorithm to generate first processed signal samples. Amplitudes and phases of the first processed signal samples are obtained. In an amplitude domain, a second contribution to the interference signal is removed from the amplitudes of the first processed signal samples using a second algorithm to generate second processed signal samples. A signal quality metric of the second processed signal samples is obtained. Based on the signal quality metric of the second processed signal samples, one or more parameters of the first or second algorithm are adjusted to improve the signal quality metric of the second processed signal samples.

    Circuits and methods for reducing an interference signal that spectrally overlaps a desired signal
    8.
    发明授权
    Circuits and methods for reducing an interference signal that spectrally overlaps a desired signal 有权

    公开(公告)号：US11588516B2

    公开(公告)日：2023-02-21

    申请号：US17398992

    申请日：2021-08-10

    Applicant: The Aerospace Corporation

    Inventor： Philip A. Dafesh ,  Phillip Brian Hess

    IPC: H04B7/02 ,  H04B1/7107 ,  H04B1/10 ,  H04B1/719

    Abstract: Under one aspect, a method is provided for processing a received signal, the received signal including a desired signal and an interference signal that spectrally overlaps the desired signal. The method can include obtaining an amplitude of the received signal. The method also can include obtaining an average amplitude of the received signal based on at least one prior amplitude of the received signal. The method also can include subtracting the amplitude from the average amplitude to obtain an amplitude residual. The method also can include, based upon an absolute value of the amplitude residual being less than or equal to a first threshold, inputting the received signal into an interference suppression algorithm so as to generate a first output including the desired signal with reduced contribution from the interference signal.

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