Download or read book Airborne Pulsed Doppler Radar written by Guy V. Morris and published by Artech House Publishers. This book was released on 1988 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the basic principles of pulse-doppler radar without resorting to a heavily mathematical treatment. High-, medium-, and low-pulse repetition frequency (PRF) modes are explained and the advantages and disadvantages of each are discussed. Also included are an explanation of the major signal-processing functions of doppler filtering, pulse compression, tracking, synthetic aperture, selection of medium PRFs, and resolving range ambiguities and a discussion of how to predict the performance of a pulse-doppler radar in the presence of noise and clutter. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Pulse Doppler Radar written by Clive Alabaster and published by IET. This book was released on 2012-06-30 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is organized into three parts, each one building on the material of the previous sections. Part I (Chapters 1-8) covers the basic principles to lay sound foundations for the following parts of the book. It emphasizes classic processing techniques, especially the fast Fourier transform (FFT), and microwave engineering issues, antennas, and hardware. The second part of the book deals with the theory and techniques specific to pulse Doppler radar. This is subdivided into Part IIA (Chapters 9-10), which covers high PRF pulse Doppler, and Part IIB (Chapters 11-15), which covers medium PRF pulse Doppler. A major theme is that of PRF selection and optimization, other waveform design issues, and the problem of ghosting. While high and medium PRF pulse Doppler techniques have become synonymous with airborne fire control radars, they are used over a broad spectrum of airborne and surface-based radar applications. Part II does emphasize the airborne radar case, but it does not neglect the surface-based radar. Finally, Part III (Chapters 16-19) presents a series of four case studies. Each of these case studies applies the material of Part II whilst also highlighting additional radar techniques (and, in some cases, non-radar considerations) specific to the application. Such is the prevalence of pulse Doppler radars today; the number of case studies that could have been considered is well into double figures. However, the four presented here suffice to illustrate the wide variety of pulse Doppler radar applications.

Download or read book Introduction to Airborne Radar written by George W. Stimson and published by SciTech Publishing. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the subject for non-specialists: engineers, technicians, pilots, and aerospace industry marketing, public relations, and customer support personnel. Also a reference for specialists in the field. The completely rewritten and revised Second Edition updates the original published by the Hughes Aircraft Company.

Download or read book Designing Clutter Rejection Filters with Complex Coefficients for Airborne Pulsed Doppler Weather Radar written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ground clutter interference is a major problem for airborne pulse Doppler radar operating at low altitudes in a look-down mode. With Doppler zero set at the aircraft ground speed, ground clutter rejection filtering is typically accomplished using a high-pass filter with real valued coefficients and a stopband notch centered at zero Doppler. Clutter spectra from the NASA Wind Shear Flight Experiments of l991-1992 show that the dominant clutter mode can be located away from zero Doppler, particularly at short ranges dominated by sidelobe returns. Use of digital notch filters with complex valued coefficients so that the stopband notch can be located at any Doppler frequency is investigated. Several clutter mode tracking algorithms are considered to estimate the Doppler frequency location of the dominant clutter mode. From the examination of night data, when a dominant clutter mode away from zero Doppler is present, complex filtering is able to significantly increase clutter rejection over use of a notch filter centered at zero Doppler. Jamora, Dennis A. Unspecified Center...

Download or read book Designing Clutter Rejection Filters with Complex Coefficients for Airborne Pulsed Doppler Weather Radar written by Dennis A. Jamora and published by . This book was released on 1993 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Airborne Radar written by George W. Stimson and published by SciTech Publishing. This book was released on 1998 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the subject for non-specialists: engineers, technicians, pilots, and aerospace industry marketing, public relations, and customer support personnel. Also a reference for specialists in the field. The completely rewritten and revised Second Edition updates the original published by the Hughes Aircraft Company.

Download or read book Analysis and Improved Design Considerations for Airborne Pulse Doppler Radar Signal Processing in the Detection of Hazardous Windshear written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution windspeed profile measurements are needed to provide reliable detection of hazardous low altitude windshear with an airborne pulse Doppler radar. The system phase noise in a Doppler weather radar may degrade the spectrum moment estimation quality and the clutter cancellation capability which are important in windshear detection. Also the bias due to weather return Doppler spectrum skewness may cause large errors in pulse pair spectral parameter estimates. These effects are analyzed for the improvement of an airborne Doppler weather radar signal processing design. A method is presented for the direct measurement of windspeed gradient using low pulse repetition frequency (PRF) radar. This spatial gradient is essential in obtaining the windshear hazard index. As an alternative, the modified Prony method is suggested as a spectrum mode estimator for both the clutter and weather signal. Estimation of Doppler spectrum modes may provide the desired windshear hazard information without the need of any preliminary processing requirement such as clutter filtering. The results obtained by processing a NASA simulation model output support consideration of mode identification as one component of a windshear detection algorithm. Lee, Jonggil Unspecified Center AIRBORNE EQUIPMENT; DETECTION; HAZARDS; METEOROLOGICAL RADAR; PULSE DOPPLER RADAR; SIGNAL PROCESSING; STATISTICAL ANALYSIS; WEATHER; WIND SHEAR; WIND VELOCITY; ALGORITHMS; CLUTTER; ERRORS; ESTIMATES; ESTIMATING; HIGH RESOLUTION; LOW ALTITUDE; LOW FREQUENCIES; SIMULATION; SPECTRA...

Download or read book Air and Spaceborne Radar Systems written by Philippe Lacomme and published by William Andrew. This book was released on 2001 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for actual users of radar, the book focuses on the history, main principles, functions, modes, properties and specific nature of modern airborne radar. It examines radar's role within the system when carrying out its assigned missions, showing the possibilities of radar, it's limitations and a discussion of how radar may evolve in the future.

Download or read book Users Guide for an Airborne Windshear Doppler Radar Simulation Awdrs Program written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-08 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description is provided of the Airborne Windshear Doppler Radar Simulation (AWDRS) program developed for NASA-Langley by the Research Triangle Institute. The radar simulation program is a comprehensive calculation of the signal characteristics and expected outputs of an airborne coherent pulsed Doppler radar system viewing a low level microburst along or near the approach path of the aircraft. The detailed nature of the simulation permits the quick evaluation of proposed trade-offs in radar system parameters and the evaluation of the performance of proposed configurations in various microburst/clutter environments. The simulation also provides a test bed for various proposed signal processing techniques for minimizing the effects of noise, phase jitter, and ground clutter and maximizing the useful information derived for avoidance of microburst windshear by aircraft. Britt, Charles L. Unspecified Center...

Download or read book The Pulse pair Algorithm as a Robust Estimator of Turbulent Weather Spectral Parameters Using Airborne Pulse Doppler Radar written by Ernest Granville Baxa and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Airborne Radar written by Donald J. Povejsil and published by . This book was released on 1961 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book MTI Radar written by D. Curtis Schleher and published by Artech House Publishers. This book was released on 1978 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Pulse Pair Algorithm As a Robust Estimator of Turbulent Weather Spectral Parameters Using Airborne Pulse Doppler Radar written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-14 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pulse pair method for spectrum parameter estimation is commonly used in pulse Doppler weather radar signal processing since it is economical to implement and can be shown to be a maximum likelihood estimator. With the use of airborne weather radar for windshear detection, the turbulent weather and strong ground clutter return spectrum differs from that assumed in its derivation, so the performance robustness of the pulse pair technique must be understood. Here, the effect of radar system pulse to pulse phase jitter and signal spectrum skew on the pulse pair algorithm performance is discussed. Phase jitter effect may be significant when the weather return signal to clutter ratio is very low and clutter rejection filtering is attempted. The analysis can be used to develop design specifications for airborne radar system phase stability. It is also shown that the weather return spectrum skew can cause a significant bias in the pulse pair mean windspeed estimates, and that the poly pulse pair algorithm can reduce this bias. It is suggested that use of a spectrum mode estimator may be more appropriate in characterizing the windspeed within a radar range resolution cell for detection of hazardous windspeed gradients. Baxa, Ernest G., Jr. and Lee, Jonggil Unspecified Center NAG1-928; RTOP 505-64-12-02...

Download or read book Nonlinear Suppression of Range Ambiguity in Pulse Doppler Radar written by Jon M. Anderson and published by . This book was released on 2001-12 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent pulse train processing is most commonly used in airborne pulse Doppler radar, achieving adequate transmitter/receiver isolation and excellent resolution properties while inherently inducing ambiguities in Doppler and range. First introduced by Palermo in 1962 using two conjugate LFM pulses, the primary nonlinear suppression objective involves reducing range ambiguity, given the waveform is nominally unambiguous in Doppler, by using interpulse and intrapulse coding (pulse compression) to discriminate received ambiguous pulse responses. By introducing a nonlinear operation on compressed (undesired) pulse responses within individual channels, ambiguous energy levels are reduced in channel outputs. This research expands the NLS concept using discrete coding and processing. A general theory is developed showing how NLS accomplishes ambiguity surface volume removal without requiring orthogonal coding. Useful NLS code sets are generated using combinatorial, simulated annealing optimization techniques - a general algorithm is developed to extended family size, code length, and number of phases (polyphase coding). An adaptive reserved code thresholding scheme is introduced to efficiently and effectively track the matched filter response of a target field over a wide dynamic range, such as normally experienced in airborne radar systems. An evaluation model for characterizing NLS clutter suppression performance is developed - NLS performance is characterized using measured clutter data with analysis indicating the proposed technique performs relatively well even when large clutter cells exist.

Download or read book Weather Radar written by Peter Meischner and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: With their images practically ubiquitious in the daily media, weather radar systems provide data not only for understanding weather systems and improving forecasts (especially critical for severe weather), but also for hydrological applications, flood warnings and climate research in which ground verification is needed for global precipitation measurements by satellites. This book offers an accessible overview of advanced methods, applications and modern research from the European perspective. An extensive introductory chapter summarizes the principles of weather radars and discusses the potential of modern radar systems, including Doppler and polarisation techniques, data processing, and error-correction methods. Addressing both specialist researchers and nonspecialists from related areas, this book will also be useful for graduate students planning to specialize in this field

Download or read book Radar and EW Modeling in MATLAB and Simulink written by Carlos A. Dávila and published by Artech House. This book was released on 2023-10-31 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This resource covers basic concepts and modeling examples for the three “pillars” of EW: Electronic Attack (EA) systems, Electronic Protection (EP) techniques, and Electronic Support (ES). It develops techniques for the modeling and simulation (M&S) of modern radar and electronic warfare (EW) systems and reviews radar principles, including the radar equation. M&S techniques are introduced, and example models developed in MATLAB and Simulink are presented and discussed in detail. These individual models are combined to create a full end-to-end engineering engagement simulation between a pulse-Doppler radar and a target. The radar-target engagement model is extended to include jamming models and is used to illustrate the interaction between radar and jamming signals and the impact on radar detection and tracking. In addition, several classic EA techniques are introduced and modeled, and the effects on radar performance are explored. This book is a valuable resource for engineers, scientists, and managers who are involved in the design, development, or testing of radar and EW systems. It provides a comprehensive overview of the M&S techniques that are used in these systems, and the book's many examples and case studies provide a solid foundation for understanding how these techniques can be applied in practice.

Download or read book Advances in Bistatic Radar written by Nicholas J. Willis and published by SciTech Publishing. This book was released on 2007-06-30 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference updates bistatic and multistatic radar developments since the publication of Nicholas Willis' seminal book Bistatic Radar published in 1991 and revised in 1995. The book is organized into two major sections: Bistatic/ Multistatic Radar Systems and Bistatic Clutter and Signal Processing. New and recently declassified military applications are documented. Civil applications are detailed for the first time, including commercial and scientific systems. Several of the most honored radar engineers of this era provide expertise in each of these applications. Professionals in radar and sonar will find this book a valuable resource