Download or read book Pulse Compression Filters and Dispersive Delay Lines written by D. B. Armstrong and published by . This book was released on 1970 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes the design and construction of surface acoustic wave pulse compression-expansion filters which operate in the UHF microwave frequency range. A matched pair of filters having a center frequency of 700 MHz, an expanded pulse length of one micro-second, and a bandwidth of 300 MHz was built and tested to demonstrate the procedure. (Author).
Download or read book An Output Expression for a Dispersive Delay Pulse Compression Filter Under Arbitrary Inputs written by William Robert Jones and published by . This book was released on 1966 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulse compression filters are used extensively in modern radar systems. The nature of output waveforms from dispersive delay pulse compression filters driven by specific matched input waveforms has been studied in great detail for these radar applications. However, little work has been done to generalize these results. This paper obtains an expression for the filter output in terms of arbitrary input signals. Several particular input waveforms are analyzed using an ideal filter with assumed specific characteristics. In an attempt to indicate trends, different pulse widths and linear frequency modulation rates are assumed for the pulse shapes chosen. The resulting output envelopes are plotted graphically. (Author).
Download or read book An Output Expression for a Dispersive Delay Pulse Compression Filter Under Arbitrary Inputs written by and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulse compression filters are used extensively in modern radar systems. The nature of output waveforms from dispersive delay pulse compression filters driven by specific matched input waveforms has been studied in great detail for these radar applications. However, little work has been done to generalize these results. This paper obtains an expression for the filter output in terms of arbitrary input signals. Several particular input waveforms are analyzed using an ideal filter with assumed specific characteristics. In an attempt to indicate trends, different pulse widths and linear frequency modulation rates are assumed for the pulse shapes chosen. The resulting output envelopes are plotted graphically. (Author).
Download or read book TAPPED DELAY LINE REALIZATIONS OF FREQUENCY PERIODIC FILTERS AND THEIR APPLICATION TO LINEAR FM PULSE COMPRESSION written by and published by . This book was released on 1963 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is shown that a linear network having an amplitude and phase response which is a periodic function of frequency can by synthesized with a tapped delay line with amplitude and phase weightings on each tap. The theory of this technique for the realization of frequency periodic filters is developed. The example which motivates the discussion of this problem is the use of a single frequency periodic filter to replace a bank of complex dispersive subpulse networks employed in a large time-bandwidth product linear FM pulse compression network. The availability of high quality tapped quartz delay lines and the ease with which amplitude and phase adjust ments can be made on each tap appear to make this technique attractive for a number of future applications.
Download or read book DELAY LINE INVESTIGATION written by Daniel J. Harris and published by . This book was released on 1967 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: A perpendicular diffraction grating dispersive delay line technique was investigated and the results are presented in this report. The technique proved to be a means of extending the state-of-the-art of dispersive delay lines as pulse compression filters. A pulse compression ratio of greater than 1000:1 was achieved with a bandwidth of 40 MHz. The technique is on the verge of becoming an operating practical pulse compression system. The insertion loss is the only problem area left and this should be easily overcome with a little more effort. (Author).
Download or read book Delay Devices for Pulse Compression Radar written by and published by . This book was released on 1966 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Procedure for Tapped Delay Line Compression Filters written by Stanford University. Stanford Electronics Laboratories and published by . This book was released on 1965 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compression-filter design is described which utilizes 76 broadband taps spaced nonuniformly along a delay line. Also described is a computer program, written in FORTRAN II language, which can be used to calculate the individual tap positions and weightings for a maximum-response peak-to-sidelobe ratio. Computations made using the computer program resulted in a compression filter matched to an excitation which changed frequency linearly with time over an octave bandwidth and which had a time-bandwidth product of 50. The response of this filter was a compressed pulse with a peak-to-sidelobe ratio of over 100. In addition, the filter proved to be less sensitive to scan-rate errors than a continuously dispersive filter with the same compression characteristics. Experimental results were obtained on a 76-tap compression filter designed to operate in the 1- to 2-Gc frequency range. The performance of this filter tends to confirm the validity of the technique and provides an encouraging basis for future work. (Author).
Download or read book Conference on Delay Devices for Pulse Compression Radar written by and published by . This book was released on 1966 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Design and Operation of a Pulse Compression System written by Ted Rzeszewski and published by . This book was released on 1965 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and operation of a pulse compression system is discussed. The experiment illustrates the dispersion of a short pulse on a given frequency into a longer pulse in which the frequency varies monotonically throughout the pulse duration. The dispersed pulse is compressed by the same filter which dispersed the short input pulse. The dispersive filter consists of two teramic transducers and an ultrasonic dispersive delay line.
Download or read book Pulse Compression written by David Knox Barton and published by Artech House Publishers. This book was released on 1975 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Pulse Compression Using Multirate Filter Banks written by Andreas Steffen and published by . This book was released on 1991 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radar Signals written by Charles Cook and published by Elsevier. This book was released on 2012-12-02 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radar Signals: An Introduction to Theory and Application introduces the reader to the basic theory and application of radar signals that are designated as large time-bandwidth or pulse-compression waveforms. Topics covered include matched filtering and pulse compression; optimum predetection processing; the radar ambiguity function; and the linear frequency modulation waveform and matched filter. Parameter estimation and discrete coded waveforms are also discussed, along with the effects of distortion on matched-filter signals. This book is comprised of 14 chapters and begins with an overview of the concepts and techniques of pulse compression matched filtering, with emphasis on coding source and decoding device. The discussion then turns to the derivation of the matched-filter properties in order to maximize the signal-to-noise ratio; analysis of radar ambiguity function using the principle of stationary phase; parameter estimation and the method of maximum likelihood; and measurement accuracies of matched-filter radar signals. Waveform design criteria for multiple and dense target environments are also considered. The final chapter describes a number of techniques for designing microwave dispersive delays. This monograph will be a useful resource for graduate students and practicing engineers in the field of radar system engineering.
Download or read book Handbook of Applied Superconductivity Volume 2 written by B Seeber and published by CRC Press. This book was released on 1998-01-01 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Applied Superconductivity, Two-Volume Set covers all important aspects of applied superconductivity and the supporting low-temperature technologies. The handbook clearly demonstrates the capabilities of superconducting technologies and illustrates how to implement these technologies in new areas of academic and industrial research and development. Volume One provides an introduction to the theoretical background of both low and high Tc superconductivity, followed by details of the basic hardware such as wires, tapes, and cables used in applications of superconductivity and the necessary supporting science and technology. Theoretical discussions are in most cases followed by examples of real designs, fabrication techniques, and practical instrumentation guidance. A final chapter examines materials properties at low temperatures. Volume Two provides examples of current and future applications of superconductivity. It covers medical systems for magnetic resonance imaging (MRI), high field magnets for research, superconducting magnets for accelerators, industrial systems for magnetic separation, and transportation systems. The final chapters look to future applications in power and superconducting electronics. With fully referenced, peer-refereed contributions from experts in various fields, this two-volume work is an essential reference for a wide range of scientists and engineers in academic and industrial research and development environments.
Download or read book Acoustic Pulse Compression Filters written by G. Judd and published by . This book was released on 1974 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the development of a set of surface acoustic wave dispersive filters having an expanded pulse length of 80 microsec. and a recompressed pulse width of less than 100 nsec. After investigating the performance characteristics of devices made with conventional dispersive transducers on bismuth germainium oxide and lithium niobate substrates it was concluded that the low distortion levels desired for these devices could best be realized using reflective array compressor(RAC) delay lines. The subsequent design and development of the RAC devices are described together with a detail account of their performance in an experimental pulse compression test loop. (Author).
Download or read book Rare Earth Materials written by A.R. Jha and published by CRC Press. This book was released on 2014-06-17 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies indicate that China accounts for about 96 percent of the world's supply of rare earth materials (REMs). With REMs becoming increasingly important for a growing number of high-tech applications, appropriate action must be taken to mitigate the effects of a shortage of critical REMs in defense systems and components.Bringing together i
Download or read book A Linear Fm 1000 1 Pulse Compression System written by R. W. Jacobus and published by . This book was released on 1963 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A linear-FM pulse compression system, synthesized as a linear time-invariant filter, is described. The transmitted waveform is roughly rectangular in shape, has a bandwidth of 1 mc, and has a duration of one millisecond; the output of the matched-filter receiver is consequently (sin x)/x in shape (before side-lobe reduction) and has a duration of about two microseconds from null to null. The parameters are thus directly compat ible with long-pulse space surveillance radars. The system contains both allpass networks and quartz delay lines. Ten channels, each control ling one-tenth of the output waveform are arranged in the form of a tapped delay line with one dispersive network connected to each tap. A brief discussion of the theory of the system, the preliminary experimental bench-test results, and a section on the practical problems encountered in the construction of the filter and its asso ciated equipment are presented. (Author).
Download or read book Linear frequency modulation derived polyphase pulse compression codes and an efficient digital implementation written by and published by . This book was released on 1981 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
