Detection Of Frequency Hopped Signals Embedded In Interference Waveforms

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Detection of Frequency-Hopped Signals Embedded in Interference Waveforms

Author :
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (614 download)

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Book Synopsis Detection of Frequency-Hopped Signals Embedded in Interference Waveforms by :

Download or read book Detection of Frequency-Hopped Signals Embedded in Interference Waveforms written by and published by . This book was released on 2005 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many military communications systems utilize frequency-hopped spread spectrum waveforms to protect against jamming and enemy detection. These waveforms may be subjected not only to intentional jamming but may also be unintentionally jammed by other communications signals. While some systems can overcome inband interference with more signal power, covert systems may be limited to small amounts of transmitted power. The objective of this thesis was to investigate a method for resolving a frequency-hopped signal embedded in interference waveforms. With exponential averaging in the frequency domain, the spectra of the interfering signals can be estimated as long as they are present over a period longer than that of the frequency-hopped signal. Certain FFT sizes and weights are more beneficial to achieving this estimate than others. The interference estimate can be used to extract the desired frequency-hopped signal through spectral division of the received signal with the estimate. This technique is designated as noise-normalization. Simulations in MATLAB demonstrate the use of the technique and show how the desired signal can be resolved.

Detection of Frequency-Hopped Waveforms Embedded in Interference Waveforms with Noise

Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (42 download)

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Book Synopsis Detection of Frequency-Hopped Waveforms Embedded in Interference Waveforms with Noise by :

Download or read book Detection of Frequency-Hopped Waveforms Embedded in Interference Waveforms with Noise written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bandwidth usage has become more complex such that it is not uncommon that multiple signals of appreciable power may be present within the same bandwidth. The presence of multiple signals in addition to additive white Gaussian (AWGN) increases the difficulty of detecting frequency-hopped (FH) waveforms. This paper investigates the performance of an exponential-averaging based FH detection method in the presence of interfering signals and AWGN. The detection method provides an estimate of the noise plus inference spectrum using exponential averaging and then generates an estimate of the desired signal spectrum by combining the estimated noise plus interference spectrum with the composite spectrum.

Detection of Frequency-hopped Signals Embedded in Non-stationary Interference

Author : Steven C. Layfield
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Detection of Frequency-hopped Signals Embedded in Non-stationary Interference by : Steven C. Layfield

Download or read book Detection of Frequency-hopped Signals Embedded in Non-stationary Interference written by Steven C. Layfield and published by . This book was released on 2008 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency-hopped spread spectrum signals are widely used in military communications to help combat or suppress interference due to jamming, other users of the channel, and multipath propagation. Frequency-hopped signals may be difficult to detect when embedded in background noise. Previous research has demonstrated techniques for interference reduction and filtering frequency-hopped spread spectrum waveforms with minimum distortion when the frequency-hop rate is on the order of 1,000 hops per second and the waveform is embedded in stationary interference waveforms. The objective of this thesis was to apply previously developed interference reduction techniques to frequency-hopped signals that hop at a much lower rate in order to determine the efficacy and practicality of these techniques for hop rates as low as five frequency-hops per second when the signal-of-interest is embedded in non-stationary interference. The technique used in this thesis to detect the frequency-hopped signals of interest is based on exponential averaging in the frequency domain. This method averages a weighted datastream in realtime. Specific fast Fourier transform block sizes and exponential average weights produce good results if the signal-to-interference and the signal-to-noise ratios are not too small.

Detection of Frequency-Hopped Signals Exposed to Non-Stationary Interference

Author :
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Detection of Frequency-Hopped Signals Exposed to Non-Stationary Interference by :

Download or read book Detection of Frequency-Hopped Signals Exposed to Non-Stationary Interference written by and published by . This book was released on 2008 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency-hopped spread spectrum signals are widely used in military communications to help combat or suppress interference due to jamming, other users of the channel, and multipath propagation. Frequency-hopped signals may be difficult to detect when embedded in background noise. Previous research has demonstrated techniques for interference reduction and filtering frequency hopped spread spectrum waveforms with minimum distortion when the frequency-hop rate is on the order of 1,000 hops per second and the waveform is embedded in stationary interference waveforms. The objective of this thesis was to apply previously developed interference reduction techniques to frequency-hopped signals that hop at a much lower rate in order to determine the efficacy and practicality of these techniques for hop rates as low as five frequency-hops per second when the signal of- interest is embedded in non-stationary interference. The technique used in this thesis to detect the frequency-hopped signals-of-interest is based on exponential averaging in the frequency domain. This method averages a weighted data stream in real time. Specific fast Fourier transform block sizes and exponential average weights produce good results if the signal-to-interference and the signal-to-noise ratios are not too small.

New Methods for the Detection and Interception of Frequency-Hopped Waveforms

Author :
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis New Methods for the Detection and Interception of Frequency-Hopped Waveforms by :

Download or read book New Methods for the Detection and Interception of Frequency-Hopped Waveforms written by and published by . This book was released on 1990 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three new methods for the detection and interception of frequency - hopped waveforms are presented. First presented are two types of sequential detectors: a purely sequential test that requires less data for a decision and a truncated sequential test that requires less data even while opeating under poor signal-to-noise ratios. Performances are evaluated via theoretical, numerical, and Monte Carlo analyses. Second, compressive-receiver-based-based interceptors are presented: (1) a locally optimal detector, which is compared against the optimal channelized detectors; (2) a simplified, suboptimal scheme, which trades off duty cycle against performance; (3) and a technique for estimating hop frequency. Quantified are the performances of the optimal and suboptimal detectors. Third, a detector based on the Amplitude Distribution Function (ADF) is presented. Given is a technique for deconvolving the ADF, enabling signal and noise separation. From this, a detection statistic is defined and statistically characterized, yielding a new class of detectors. The detectors are performance analyzed. Keywords: Spread spectrum, Frequency-hopped, Electronic counter measures, Interception, Probability, Detection, Statistics.

Interference Analysis and Reduction for Wireless Systems

Author : Peter Stavroulakis
Publisher : Artech House
ISBN 13 : 9781580535748
Total Pages : 442 pages
Book Rating : 4.5/5 (357 download)

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Book Synopsis Interference Analysis and Reduction for Wireless Systems by : Peter Stavroulakis

Download or read book Interference Analysis and Reduction for Wireless Systems written by Peter Stavroulakis and published by Artech House. This book was released on 2003 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This leading-edge resource offers you a new methodology for analyzing and studying the behavior of wireless communication systems in an interference environment. It provides you with modern tools and techniques for use in real-world applications that help you guarantee optimum system performance. The book treats both additive and multiplicative interfering signals, including in-depth descriptions of how these signals behave, regardless of the source.

Wideband, Noncoherent, Frequency-Hopped Waveforms and Their Hybrids in Low-Probability-of-Intercept Communications

Author : John D. Edell
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Wideband, Noncoherent, Frequency-Hopped Waveforms and Their Hybrids in Low-Probability-of-Intercept Communications by : John D. Edell

Download or read book Wideband, Noncoherent, Frequency-Hopped Waveforms and Their Hybrids in Low-Probability-of-Intercept Communications written by John D. Edell and published by . This book was released on 1976 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency hopping is a commonly used technique for achieving wide spread spectrum bandwidths in intercept-resistant and interference-resistant communications. This report develops the techniques necessary to determine the contribution of a frequency-hopped modulation to communication system detectability, independent of such scenario-related parameters as relative geometry, antenna gains, and link margins. A variety of frequency-hopped modulation schemes, associated processing techniques, and losses are discussed. Optimum intercept receivers are considered in order to place a theoretical bound on a signal detectability. This, in turn, leads to the development of quality factors which permit any analysis of the impact of waveform parameters alone on convertness. A parametric analysis is performed in terms of these quality factors for a large family of modulations. The result is a small subset of signals optimized for convertness, consisting of fast hop pulsed waveforms and slow hop continuous waveforms, both with pseudonoise hop bandwidth spreading. Selection of the final modulation must ultimately depeend on such additional system synchronization time, implementation complexity, and jam resistance. The impact of these factors is discussed qualitatively.

Detection of Frequency Hopping Signals in Digital Wideband Data

Author : Read, William J. L
Publisher : Defence R&D Canada - Ottawa
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (54 download)

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Book Synopsis Detection of Frequency Hopping Signals in Digital Wideband Data by : Read, William J. L

Download or read book Detection of Frequency Hopping Signals in Digital Wideband Data written by Read, William J. L and published by Defence R&D Canada - Ottawa. This book was released on 2002 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Sensor Signal and Information Processing III

Author : Wai Lok Woo
Publisher : MDPI
ISBN 13 : 303650012X
Total Pages : 394 pages
Book Rating : 4.0/5 (365 download)

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Book Synopsis Sensor Signal and Information Processing III by : Wai Lok Woo

Download or read book Sensor Signal and Information Processing III written by Wai Lok Woo and published by MDPI. This book was released on 2021-02-05 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the current age of information explosion, newly invented technological sensors and software are now tightly integrated with our everyday lives. Many sensor processing algorithms have incorporated some forms of computational intelligence as part of their core framework in problem-solving. These algorithms have the capacity to generalize and discover knowledge for themselves and to learn new information whenever unseen data are captured. The primary aim of sensor processing is to develop techniques to interpret, understand, and act on information contained in the data. The interest of this book is in developing intelligent signal processing in order to pave the way for smart sensors. This involves the mathematical advancement of nonlinear signal processing theory and its applications that extend far beyond traditional techniques. It bridges the boundary between theory and application, developing novel theoretically inspired methodologies targeting both longstanding and emergent signal processing applications. The topics range from phishing detection to integration of terrestrial laser scanning, and from fault diagnosis to bio-inspired filtering. The book will appeal to established practitioners, along with researchers and students in the emerging field of smart sensor signal processing.

Signal Processing for Joint Radar Communications

Author : Kumar Vijay Mishra
Publisher : John Wiley & Sons
ISBN 13 : 1119795559
Total Pages : 453 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Signal Processing for Joint Radar Communications by : Kumar Vijay Mishra

Download or read book Signal Processing for Joint Radar Communications written by Kumar Vijay Mishra and published by John Wiley & Sons. This book was released on 2024-04-09 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signal Processing for Joint Radar Communications A one-stop, comprehensive source for the latest research in joint radar communications In Signal Processing for Joint Radar Communications, four eminent electrical engineers deliver a practical and informative contribution to the diffusion of newly developed joint radar communications (JRC) tools into the sensing and communications communities. This book illustrates recent successes in applying modern signal processing theories to core problems in JRC. The book offers new results on algorithms and applications of JRC from diverse perspectives, including waveform design, physical layer processing, privacy, security, hardware prototyping, resource allocation, and sampling theory. The distinguished editors bring together contributions from more than 40 leading JRC researchers working on remote sensing, electromagnetics, optimization, signal processing, and beyond 5G wireless networks. The included resources provide an in-depth mathematical treatment of relevant signal processing tools and computational methods allowing readers to take full advantage of JRC systems. Readers will also find: Thorough introductions to fundamental limits and background on JRC theory and applications, including dual-function radar communications, cooperative JRC, distributed JRC, and passive JRC Comprehensive explorations of JRC processing via waveform analyses, interference mitigation, and modeling with jamming and clutter Practical discussions of information-theoretic, optimization, and networking aspects of JRC In-depth examinations of JRC applications in cutting-edge scenarios including automotive systems, intelligent reflecting surfaces, and secure parameter estimation Perfect for researchers and professionals in the fields of radar, signal processing, communications, information theory, networking, and electronic warfare, Signal Processing for Joint Radar Communications will also earn a place in the libraries of engineers working in the defense, aerospace, wireless communications, and automotive industries.

On the Acquisition of Frequency-hopped Spread Spectrum Signals in Jamming

Author : Peter Regent Pawlowski
Publisher :
ISBN 13 :
Total Pages : 700 pages
Book Rating : 4.:/5 (514 download)

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Book Synopsis On the Acquisition of Frequency-hopped Spread Spectrum Signals in Jamming by : Peter Regent Pawlowski

Download or read book On the Acquisition of Frequency-hopped Spread Spectrum Signals in Jamming written by Peter Regent Pawlowski and published by . This book was released on 1986 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Detection of Frequency Hopping Signals in Digital Wideband Data

Author : Defence Research Establishment Ottawa
Publisher :
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (527 download)

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Book Synopsis Detection of Frequency Hopping Signals in Digital Wideband Data by : Defence Research Establishment Ottawa

Download or read book Detection of Frequency Hopping Signals in Digital Wideband Data written by Defence Research Establishment Ottawa and published by . This book was released on 2002 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Resilient Space Systems Design

Author : Ron Burch
Publisher : CRC Press
ISBN 13 : 0429622929
Total Pages : 193 pages
Book Rating : 4.4/5 (296 download)

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Book Synopsis Resilient Space Systems Design by : Ron Burch

Download or read book Resilient Space Systems Design written by Ron Burch and published by CRC Press. This book was released on 2019-09-11 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recognized as a "Recommended" title by Choice for their November 2020 issue. Choice is a publishing unit at the Association of College & Research Libraries (ACR&L), a division of the American Library Association. Choice has been the acknowledged leader in the provision of objective, high-quality evaluations of nonfiction academic writing. Presenting a fundamental definition of resilience, the book examines the concept of resilience as it relates to space system design. The book establishes the required definitions, relates its place to existing state-of-the-art systems engineering practices, and explains the process and mathematical tools used to achieve a resilient design. It discusses a variety of potential threats and their impact upon a space system. By providing multiple, real-world examples to illustrate the application of the design methodology, the book covers the necessary techniques and tools, while guiding the reader through the entirety of the process. The book begins with space systems basics to ensure the reader is versed in the functions and components of the system prior to diving into the details of resilience. However, the text does not assume that the reader has an extensive background in the subject matter of resilience. This book is aimed at engineers and architects in the areas of aerospace, space systems, and space communications.

Detecting and Classifying Low Probability of Intercept Radar

Author : Phillip E. Pace
Publisher : Artech House
ISBN 13 : 159693235X
Total Pages : 893 pages
Book Rating : 4.5/5 (969 download)

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Book Synopsis Detecting and Classifying Low Probability of Intercept Radar by : Phillip E. Pace

Download or read book Detecting and Classifying Low Probability of Intercept Radar written by Phillip E. Pace and published by Artech House. This book was released on 2009 with total page 893 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This comprehensive book presents LPI radar design essentials, including ambiguity analysis of LPI waveforms, FMCW radar, and phase-shift and frequency-shift keying techniques. Moreover, you find details on new OTHR modulation schemes, noise radar, and spatial multiple-input multiple-output (MIMO) systems. The book explores autonomous non-linear classification signal processing algorithms for identifying LPI modulations. It also demonstrates four intercept receiver signal processing techniques for LPI radar detection that helps you determine which time-frequency, bi-frequency technique best suits any LPI modulation of interest."--Publisher.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

New Methods for the Detection and Interception of Unknown, Frequency-hopped Waveforms

Author : William Edward Snelling
Publisher :
ISBN 13 :
Total Pages : 362 pages
Book Rating : 4.:/5 (239 download)

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Book Synopsis New Methods for the Detection and Interception of Unknown, Frequency-hopped Waveforms by : William Edward Snelling

Download or read book New Methods for the Detection and Interception of Unknown, Frequency-hopped Waveforms written by William Edward Snelling and published by . This book was released on 1990 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Detection and Estimation of Frequency Hopping Signals Using Wavelet Transforms

Author : Howard F. Overdyk
Publisher :
ISBN 13 : 9781423565338
Total Pages : 113 pages
Book Rating : 4.5/5 (653 download)

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Book Synopsis Detection and Estimation of Frequency Hopping Signals Using Wavelet Transforms by : Howard F. Overdyk

Download or read book Detection and Estimation of Frequency Hopping Signals Using Wavelet Transforms written by Howard F. Overdyk and published by . This book was released on 1997-09-01 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the use of wavelet transforms in the detection and estimation of spread spectrum frequency hopping signals. The technique developed in this work makes only two basic assumptions of a minimum hopping time and a minimum frequency hopping differential. The approach is based on the phase information of the temporal correlation function and the resulting discrete wavelet transform is used to estimate the hopping time of frequency hopping signals. Results show the proposed scheme is robust to additive white noise for SNR levels of 3 dB and above.