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Author: G. O. Young
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 130
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Book Description
The problem of antenna processing for surface target detection in clutter is considered in this report. The general problem of the hypothesis testing and estimating of N targets in clutter and noise is formulated by means of decision theory. The theory is applied to the case of a single, nonscintillating target with unknown a priori amplitude, phase, and location. The a priori statistics of these parameters are assumed, and target detection is accomplished by means of a generalized likelihood ratio test. The hypothesis test is instrumented for clutter as well as receiver noise. Both scintillating and nonscintillating clutter are considered. (Author).
Author: G. O. Young
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 130
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Book Description
The problem of antenna processing for surface target detection in clutter is considered in this report. The general problem of the hypothesis testing and estimating of N targets in clutter and noise is formulated by means of decision theory. The theory is applied to the case of a single, nonscintillating target with unknown a priori amplitude, phase, and location. The a priori statistics of these parameters are assumed, and target detection is accomplished by means of a generalized likelihood ratio test. The hypothesis test is instrumented for clutter as well as receiver noise. Both scintillating and nonscintillating clutter are considered. (Author).
Author: G. O. Young
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 106
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Book Description
Author: J. E. Howard
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 184
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Book Description
The functional design of a decision-theoretic adaptive radar (DTAR) is outlined with a comparison among scanning, multiple-beam, and parallel-antenna-element transmitting and receiving systems. Decision-theoretic antenna processing is operationally contrasted with conventional processing. The performance of DTAR is evaluated for single-target detection and estimation and contrasted with the performance of conventional processors. Average Bayes risk is used as a performance criterion. The multiple-target hypothesis testing and estimation problem is formulated and solved for a uniform clutter environment. A suboptimum estimator is developed to ease computational difficulties. A simplified decision tree is developed and proved optimum. Range and velocity measurements are designed by analogy with antenna array theory. A frequency-sampling coherent radar results. (Author).
Author: G. O. Young
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
The generalized likelihood ratios needed for detection and other types of hypothesis tests are presented for the case of time-invariant input signals, clutter, noise, etc., for N antenna elements, K targets, K' discrete clutter sources, and uniform background clutter and receiver noise. The targets and clutter considered were assumed to be nonscintillating. Specific likelihood ratio tests are also given for the detection of one or more targets versus no targets, and a block diagram of a detector that performs these tests is shown. Time- and space-saving computing techniques are described that reduce the complexity of these very general tests. Probability distributions are also presented that are immediately applicable to estimation as well as to hypothesis testing and that result in a substantial savings of effort in the synthesis of estimators for decision-theoretic antenna systems. (Author).
Author: G. O. Young
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 124
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Book Description
The target-detection capability of a proposed decision-theoretic processing array is compared with that of highly sophisticated conventional arrays. The decision-theoretic system performs a multidimensional hypothesis test on the vector of outputs of the elements of the array, while the conventional radar system performs a similar, but one-dimensional, test on the summed outputs of the elements. The quality criterion used is the average risk, or the average probability of error in decision making. The test is between target present or target absent in a background of heavy ground clutter. Probability-of-error computations show that the decision-theoretic array is always superior to the conventional array. Its performance is essentially independent of the location of the target; it detects targets anywhere within the field of view, requires no scanning, and is fixed relative to the vehicle that carries it. The effect on overall risk of various types of errors made in assuming a priori probability distributions, both uniform and peaked, is also considered for decision theoretic systems. The proposed system is shown to be relatively insensitive to the types of errors considered. The instrumentation of such a system is illustrated by a system block diagram developed for an a priori uniform probability distribution of target position. (Author).
Author: G. O. Young
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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Book Description
The generalized likelihood ratios needed for detection and other types of hypothesis tests in decision-theoretic antenna processing systems are presented for the case of time-varying but statistically stationary returns with N antenna elements, K targets, K discrete clutter sources, and uniform background clutter and receiver noise. Likelihood ratio tests for the detection of one or more targets versus no targets are given for scintillating target signals and scintillating clutter and for nonscintillating target signals and scintillating clutter. A block diagram of a detector for an antenna processor that can perform these tests is presented. The probability distributions that were developed are also given and are immediately applicable to estimation as well as to hypothesis testing. (Author).
Author: Alexander V. Totsky
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110368889
Category : Technology & Engineering
Languages : en
Pages : 210
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Book Description
By studying applications in radar, telecommunications and digital image restoration, this monograph discusses signal processing techniques based on bispectral methods. Improved robustness against different forms of noise as well as preservation of phase information render this method a valuable alternative to common power-spectrum analysis used in radar object recognition, digital wireless communications, and jitter removal in images.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 850
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author: Guan Gui
Publisher: Springer Nature
ISBN: 3030364054
Category : Computers
Languages : en
Pages : 476
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Book Description
This two-volume set LNICST 301 -302 constitutes the post-conference proceedings of the Third EAI International Conference on Advanced Hybrid Information Processing, ADHIP 2019, held in Nanjing, China, in September 2019. The 101 papers presented were selected from 237 submissions and focus on hybrid big data processing. Since information processing has acted as an important research domain in science and technology today, it is now to develop deeper and wider use of hybrid information processing, especially information processing for big data. There are more remaining issues waiting for solving, such as classification and systemization of big data, objective tracking and behavior understanding in big multimedia data, encoding and compression of big data.
