Raytheon Company

Ratheon Company

David Brent Wilson

Lee M Savage

Phuoc T Ho

Edward Marsh Jackson

James E Henry

Loyra G Dirzo

Jose A Ruvalcaba

Jeffrey J Becker

An emitter identification system arranged to: receive a detected signal including one or more emitter signals from one or more emitters respectively where each of the emitter signals includes a unique signal characteristic related to a unique physical feature of a hardware structure associated with each of the emitters; apply a modulation signal to the detected signal to generate pulse in-phase and quadrature (IQ) data associated with the one or more emitter signals; extract one or more amplitude envelopes associated with the one or more emitter signals, where each amplitude envelope is related to the unique signal characteristic associated with each of the one or more emitters; estimate the unique signal characteristic of each of the one or more emitter signals; estimate a number of clusters related to a number of emitter signals; and identify each of the emitters by applying an unsupervised learning function.

Systems and methods for specific emitter identification

A method for transforming and reconstructing a signal includes receiving a plurality of samples of a waveform of the signal at different points in time. The waveform of the signal is transformed, for each sample, into an in-phase (I) component and a quadrature (Q) component. A derotational circuit applies a delayed complex conjugate multiple (DCM) to the signal to determine a constant product having an I component (I) and a Q component (Q). A magnitude component is determined based on Iand Q. A delta phase component is determined based on Iand Q. The magnitude component is processed to create a processed magnitude component. The delta phase component is processed to create a processed delta phase component. An IQ waveform is created by reconstructing the waveform of the signal based on the processed magnitude component and the processed phase component.

Waveform transformation and reconstruction

A method and system for detecting and characterizing an input signal receive a signal having an in-phase (I) component and a quadrature-phase (Q) component. A first IQ sample of the signal is acquired at a first point in time, and a second IQ sample of the signal is acquired at a second point in time, Using one or more processors, a delayed complex conjugate multiply (DCM) is applied to the first IQ sample of the signal and the second IQ sample of the signal to produce a constant product having an in-phase (I) component and a quadrature-phase (Q) component. A signal magnitude and a signal frequency are determined from the Icomponent of the constant and the Qcomponent of the constant, using the one or more processors.

Signal detection and characterization

A signal repeater () includes a signal processing part () and a signal repeating part (). The signal processing part includes a converter () configured to receive an input signal and to convert the input signal into quadrature signals, and a processor () configured to process the quadrature signals to determine one or more characteristics of the input signal, and to compare the one or more characteristics of the input signal and a plurality of predetermined characteristics to generate a comparison result. The signal repeating part () is configured to selectively repeat the input signal as a repeated signal in accordance with the comparison result.

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David Brent Wilson