Download or read book Improvement in Target Detection with a Frequency Agile Pulsed Non coherent Radar written by Kenneth Lee Horn and published by . This book was released on 1969 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Frequency agile tracking radars have received considerable attention in the literature. Frequency agility is useful in reducing target scintillations, thereby reducing tracking errors under certain conditions. However, little attention has been devoted to the improvement that can be expected in target detection with a frequency agile radar. In the past, complete pulse-to-pulse decorrelation of the target returns has been assumed for all of the analyses concerning target detection with frequency agile radars. This assumption always implies a transmitter with a large bandwidth. This dissertation analyses a pulsed non-coherent frequency agile radar applied to Swerling's Case I target. The target model is modified by assuming time decorrelation of the returns in the latter portion of the dissertation. Partial correlation of the returns is also allowed. It is shown that random selection of the transmitted frequency from a continuous probability density function yields a significant reduction in the transmitter bandwidth requirement, when compared to previous analyses, with a negligible decrease in detection range. Two practical density functions for the transmitted frequency are studied in detail, the uniform and anti-sine distribution. However, the results are general in that the curves for detection probabilities may be applied directly to any pulsed non-coherent frequency agile radar whose transmitted frequency is obtained from a probability density function. The analysis yields a closed form solution, previously unknown, for detection probabilities in the case of Swerling's Case I target. A computer program is included which calculates detection probabilities for Swerling's Case I target modified by a time decorrelation function"--Abstract, leaves ii-iii.

Download or read book Improvement in Target Detection with a Frequency Aggile Pulsed Non coherent Radar written by Kennth Lee Horn and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frequency agile radar signal processing written by W. M. Waters and published by . This book was released on 1977 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern radars may incorporate pulse-to-pulse carrier frequency modulation to increase probability of detection, to reduce vulnerability to jamming, and to reduce probability of interception. However, if coherent processing is used for clutter rejection, the frequency of N consecutive pulses must be held constant for N-pulse clutter cancellation or doppler filtering. If M pulses are transmitted during the time the antenna illuminates a target, there are M/N coherently integrated echoes available for noncoherent integration in the computer or the operator's display to further improve the signal-to-noise ratio (SNR). In this report, analytical and simulation methods are employed to determine the balance between coherent and noncoherent integration that yields the greatest SNR improvement. Attention is focused upon three models which include FFT doppler filtering and different systems of combining and noncoherently integrating doppler filtered signals. Curves of detectable SNR as a function of M and N are presented for all three models. (Author).

Download or read book The Use of Frequency Agility to Achieve High Probability of Target Detection on a Single Radar Scan written by Wayne Rivers and published by . This book was released on 1975 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: To achieve high probability of detection on a single scan, noncoherent integration of video signals can be more efficient than coherent integration if frequency agility is used to decorrelate the radar return pulse-to-pulse from a slowly fluctuating target. For a required detection probability of 0.9, the potential advantage from noncoherent integration of frequency-agile returns, as compared to coherent integration of the same total pulse energy on a single frequency, is about 5 dB for Swerling Case I-II targets and 2 dB for Case III-IV targets. The potential advantage is greater when higher detection probabilities are required. A strategy usable for both Swerling Case I-II and III-IV targets and P sub D values of 0.9 to 0.99 is indicated in which the burden of coherent and noncoherent integration is partitioned during the available dwell so that the number of statistically independent samples integrated after envelope detection is between 9 and 14.

Download or read book Frequency Agility and Diversity written by David Knox Barton and published by Artech House Publishers. This book was released on 1977 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Techniques and System Design of Radar Active Jamming written by Guangfu Tang and published by Springer Nature. This book was released on 2023-02-20 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book serves as a handbook for radar active jamming system designers, in which design principles and methods are introduced in detail. The book starts from the basic concept and then discusses requirements analysis, type selection, key indicators description, and design methods of radar active jamming system and each subsystem step by step. The content is expressed in an intelligible way, and hence, it is easy to follow even for beginners in this area. Since the authors of this book are all experts and have designed plenty of real systems, their book certainly helps new engineers deal with different kinds of problems encountered while designing a radar active jamming system.

Download or read book Proceedings of the International Radar Symposium India 83 9 12 October 1983 written by and published by . This book was released on 1983 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radar Signal to Noise Ratio Improvement for Target Detection Using Adaptive Antenna Array Processing written by David H. Pham and published by . This book was released on 2017 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of the test case performance results reflects the selection of correct RF waveform parameters such as pulse repletion frequency, carrier frequency and receiver bandwidth for specific scenarios will result in significant improvement in SNR. Furthermore, by applying adaptive antenna signal processing techniques to null out interference sources that cancel out the noise, results show that the sidelobes noise level is lower and the mainlobe target signal is significantly higher which achieves the objective of higher SNR. The objective of higher SNR is achieved.

Download or read book Report of NRL Progress written by Naval Research Laboratory (U.S.) and published by . This book was released on 1977 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marcum s and Swerling s Data on Target Detection by a Pulsed Radar written by L. F. Fehlmer and published by . This book was released on 1962 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marcum has produced a definitive treatment of the statistical problem of target detection by a pulse radar. The text and graphs of Marcum's papers are presented in terms so highly mathematical that his results may not appear as useful as they really are. The purpose of this memo is to describe the problem that Marcum solved and to present graphs of more extensive and more accurate computed data in a form which may prove more useful for most applications. Nothing new is added from the statistical viewpoint. Those interested in the mathematical development are referred to Studies of Target Detection by Pulsed Radar, IRE Transactions Volume IT-6, No. 2, April 1960.

Download or read book Modern Radar Systems written by Hamish Meikle and published by Artech House. This book was released on 2008 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised and updated edition to the popular Artech House book, Modern Radar Systems, offers complete and current coverage of the subject, including new material on accuracy, resolution, and convolution and correlation. The book features more than 540 illustrations (drawn in Maple V) that offer a greater understanding of various waveforms, and other two- and three-dimensional functions, to help you more accurately analyze radar system performance. The effects of pulse shaping on transmitter stability and spectra are discussed? a topic which is becoming more and more important in the age of electromagnetic compatibility. The book addresses the importance of low attenuation and reflection between the main radio frequency blocks, including the use of oversized waveguides for long runs.

Download or read book The Record of the IEEE International Radar Conference written by and published by . This book was released on 1995 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Technology Related to Radar Signal Imaging and Radar Cross Section Measurement written by Hirokazu Kobayashi and published by MDPI. This book was released on 2020-06-16 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radar-related technology is mainly processed within the time and frequency domains but, at the same time, is a multi-dimensional integrated system including a spatial domain for transmitting and receiving electromagnetic waves. As a result of the enormous technological advancements of the pioneers actively discussed in this book, research and development in multi-dimensional undeveloped areas is expected to continue. This book contains state-of-the-art work that should guide your research.

Download or read book High Resolution Radar written by Donald R. Wehner and published by . This book was released on 1987 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Jane s Weapon Systems written by and published by . This book was released on 1988 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt: