Download or read book A Two step Procedure for Radar Target Identification Using Correlated Sequential Detection written by Jon A. Zachman and published by . This book was released on 1969 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radar Parametric Analysis Part II A Two Step Procedure for Radar Target Identification Using Correlated Sequential Detection written by R. J. Polge and published by . This book was released on 1969 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the study is to determine those characteristics of a radar target which are most useful for identification purposes and combine them into a single comprehensive target model. A two-step identification procedure is developed. First, the cross section scattering matrix model is used to determine the orientation angle, and to eliminate the target-aspect angle combinations which are most unlikely. Then, the information contained in the short pulse response and dynamic response is used to arrive at a final decision based on maximum probability. A flow chart shows how the identification technique can be programmed on a digital computer. (Author).

Download or read book Radar Target Detection written by Daniel Meyers and published by Elsevier. This book was released on 2012-12-02 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radar Target Detection: Handbook of Theory and Practice covers a set of graphical solutions to the detection problem, designated as Meyer Plots, for radar systems design. A radar system's major purpose is the detection and location of an object by means of a return signal, which could be either a reflection or a beacon. This book is composed of four chapters. Chapter 1 presents the basic radar range equation, which is the basic relationship which permits the calculation of echo signal strength from measurable or known parameters of the radar transmitter, antenna, propagation path, and target. Chapter 2 provides examples for determining statistical signal detection using Meyer Plots, particularly for determining detection probability and integration loss and efficiency. Chapter 3 describes the application of target models to determination of detection probability. Chapter 4 examines how Meyer Plots can be used to solve problems involving most any target model.

Download or read book A Two step Sequential Procedure for Improving the Cumulative Probability of Detection in Radars written by L. E. Brennan and published by . This book was released on 1964 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Memorandum discusses a simple two-step search procedure for phased-array radars. The two-step procedure consists of illuminating each beam position in turn with a single transmitted pulse, and testing for the presence of a return signal from a target in each of m range positions. If the preset threshold is crossed in any range cell, a second higher-energy pulse (or train of pulses) is transmitted, a test is again performed on the return waveform, and a second threshold is used for comparison. If the second threshold crossing is observed in the same range cell, the decision is made that a target is present at that range. If the first threshold is not crossed, or if the first is crossed but the second is not, the decision is made that no target is present, and the next beam position is examined. Such a method is easily implemented in a phased-array radar, where the transmitting beam may be made to stop instantaneously (or return) when necessary to transmit the confirmation pulse. (Author).

Download or read book Radar Target Identification by Cross correlation of the Envelope Detected Impulse Response written by John William Willcox and published by . This book was released on 1968 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Nonparametric Sequential Pattern Classification Method for Radar Target Recognition written by Young Sun Lim and published by . This book was released on 1993 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radar Sequential Detection Techniques Study written by Julian Bussgang and published by . This book was released on 1965 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of a study of sequential detection techniques suitable for an electronic scan radar. The search sector of the radar is considered subdivided into many beam pointing positions and the range along any beam direction into several range bins. The number of pulses allotted in each beam pointing position is varied according to the energy received in the position being examined and is also limited by the time spent in previous positions. The purpose of the time constraint is to assure that the antenna beam returns to each position within a specified frame time. The adopted rule for allotting the quota of pulses in each beam position is called the Cyclic Queue Allotment Rule (CQAR). If the frame contains sufficient beam positions the analysis shows appreciable energy savings over both a uniform scan and a sequential scan truncated after a fixed number of pulses. The effect of multiple range bins is also analyzed using an 'absorbing barrier' model; it is established that sequential procedures can be profitably used even when a large number of parallel range and velocity bins is tested. The increase in energy savings (relative to a fixed test) over the estimates made in previous studies is caused by introducing in the analysis the range dependence of the signal-to-noise ratio. The procedure for detecting a fluctuating target is formulated and two methods are outlined for scan-to-scan and pulseto-pulse fluctuations. The results of this study will be encouraging to those who previously found the savings of a sequential procedure insufficient to justify a change from the conventional uniform scan. (Author).

Download or read book Radar Target Detection Employing On Line Estimation of the Video Correlation written by Lakshman P. Sinha and published by . This book was released on 1974 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Report presents a new target detection scheme for sliding window detectors. The scheme calls for adaptively adjusting leading and trailing edge target detection threshold based upon the existing coefficient of correlation between the consecutive radar returns. The coefficient of a correlation is estimated on-line by examining the ZERO-ONE pattern over a window of fixed size every scan, and updating the estimate for a specified number of scans using a least square error estimation technique. The number of scans is selected as a parameter. The recursive estimation technique facilitates the estimation of the coefficient of correlation with minimal storage requirements. A constant check on the coefficient of correlation between consecutive radar returns is made by repeating the process of on-line estimation and selection of a new set of leading and trailing edge thresholds after every preset time interval. This preset time interval reflects the time span during which the weather may be considered constant over a certain area. (Modified author abstract).

Download or read book Polarimetric Processing and Sequential Detection for Automatic Target Recognition Systems written by Emre Ertin and published by . This book was released on 1999 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation consists of studies on polarimetric processing and sequential detec-tion for automatic target recognition (ATR) systems.

Download or read book Radar Target Detection Employing On line Estimation of Video Correlation Final Report written by and published by . This book was released on 1974 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Target Identification and Detection Using Impulse Radars Or Ultra Wideband Radars written by and published by . This book was released on 1996 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this research program are to study the feasibility and to develop schemes for using an ultra-wideband or short-pulse (UWB/SP) radar to (1) detect a target in a sea clutter environment and (2) identify airborne targets. For the first topic, we have conducted a theoretical and experimental study of the transient scattering of a short pulse from sea surfaces of various models and the application of the E-pulse technique to detect a target flying above a disturbed sea surface. For the second topic, we have developed the schemes of target identification using the E-pulse technique, the neural network method, the time-domain imaging and some other related methods. This report summarizes many significant results which may be useful in the design of future UWB/SP radars.

Download or read book Radar Target Recognition Using Bispectrum Correlation written by and published by . This book was released on 2007 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ship commanders and pilots make life or death decisions based on the information they have at their disposal at the instant a decision is made. One component of that information is whether a radar contact is an enemy or a friend. Various systems exist which try to answer that question based on the characteristics of signals emitted or scattered from the contact. The goal is to maximize the accuracy of identification in order to build trust that when the system tells the operator the contact is an incoming friendly, he knows that it is. This thesis examines the technique of using the bispectrum of backscattered radar energy to identify a contact. Bispectra allow the examination of multiple scattering contributions to the return. This technique is compared to one using radar range profiles. A library of sample radar signatures is built using computational radar cross section estimation tools and 3-D model aircraft. This library is the basis of a series of simulations with aircraft at multiple aspects and configurations to determine whether using the bispectrum enhances the performance of identification systems using range profiles. It is determined that a bispectrum method meets or exceeds the identification accuracy of a range profile method especially with high-bandwidth systems.

Download or read book The Application of Correlation Techniques to Weak Radar Target Detection written by Norman R. Gillespie and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of a correlation sensitive radar detection technique written by Robert E. Lefferts and published by . This book was released on 1976 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radar Target Detection in Non Gaussian Correlated Clutter written by Ben Cantrell and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new processor for detecting a radar target in correlated, non-Gaussian clutter is obtained. When this processor and a matched filter are excited with this type of data, performance is improved over that of the matched filter alone. The processor is obtained by developing an approximate, multivariate, probability density for the clutter and constructing a Neyman-Pearson test. The processor is then obtained by using an approximation to the likelihood ratio obtained from the Neyman-Pearson test. Keywords include: Detection; radar signal processing; Radar.

Download or read book High Range Resolution Radar Target Identification Using the Prony Model and Hidden Markov Models written by and published by . This book was released on 1992 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully polarized Xpatch signatures are transformed to two left circularly polarized signals. These two signals are then filtered by a linear FM pulse compression ('chirp') transfer function, corrupted by AWGN, and filtered by a filter matched to the 'chirp' transfer function. The bandwidth of the 'chirp' radar is about 750 MHz. Range profile feature extraction is performed using the TLS Prony Model parameter estimation technique developed at Ohio State University. Using the Prony Model, each scattering center is described by a polarization ellipse, relative energy, frequency response, and range. This representation of the target is vector quantized using a K-means clustering algorithm. Sequences of vector quantized scattering centers as well as sequences of vector quantized range profiles are used to synthesize target specific Hidden Markov Models (HMM's). The identification decision is made by determining which HMM has the highest probability of generating the unknown sequence. The data consist of synthesized Xpatch signatures of two targets which have been difficult to separate with other RTI algorithms. The RTI algorithm developed for this thesis is clearly able to separate these two targets over a 10 by 10 degree (1 degree granularity) aspect angle window off the nose for SNRs as low as 0 dB. The classification rate is 100 % for SNRs of 5 - 20 dB, 95 % for a SNR of 0 dB and it drops rapidly for SNRs lower than 0 dB.

Download or read book Test Target Correlation Radar Characteristics written by Active Safety Systems Standards Committee and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document will provide methodologies and procedures to validate active safety test targets and correlate them to the objects they are intended to represent. This process will be separated into three procedures. The correlation procedure will document a means of measuring representative object characteristics and how to calculate a correlation score for a test target using that objective characteristic measurement. The validation procedure will be utilized to determine the correlation score for the test target. A confirmation procedure will identify unacceptable characteristic deviations of the targets during use in the field. Test targets may include cars, pedestrians, motorcycles, bicycles, or any other object that may be encountered by a vehicle. This document relates only to the radar characteristics of these test targets. Surrogate targets are used throughout the automotive industry to safely and repeatably test active safety systems as well as other vehicle systems. For the test results to be representative of real-world scenarios, the surrogate targets must be representative of the real-world objects that they represent. Existing methods for comparing radar characteristics of objects typically require substantial equipment, time, and facilities. At this point, there is no widely accepted method to verify that a surrogate target has the same characteristics as a real-world object that allows for the use of automotive-grade equipment. Additionally, there is no widely accepted method to verify that the characteristics of a target, which has been in use, are unchanged. This document will provide these procedures.