Propagation Through a Random Medium and Its Effects on Antennas that Maximize Information Transfer
Propagation Through a Random Medium and Its Effects on Antennas that Maximize Information Transfer

Author: Charles J. Drane (Jr.)

Publisher:

Published: 1969

Total Pages: 66

ISBN-13:

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Statistical communication theory has been applied to the problem of the analysis and optimization of controlled systems that process electromagnetic fields of an information-carrying nature. Maximum information transfer is the objective, which is achieved by a maximization of the transcorrelation function (a space-time average of the correlation between input and output signals of the communications system) relative to various parameters of the system. These techniques have been used in the optimization of the amplitude and phase taper of a receiving array that is part of a communications link in which a fluctuating medium intervenes between transmitter and receiver. The relationship between the transcorrelation function and these antenna parameters has been established. It is the specific purpose of this paper to establish in turn the relationship between the transcorrelation function and the statistical properties of the constitutive parameters of the medium that generally lead to a decorrelation of the transmitted signal. (Author).

HRIS Abstracts
HRIS Abstracts

Author: National Research Council (U.S.). Highway Research Board

Publisher:

Published: 1968

Total Pages: 1028

ISBN-13:

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Study of Application of Antenna Optimization Techniques
Study of Application of Antenna Optimization Techniques

Author: G. O. Young

Publisher:

Published: 1967

Total Pages: 22

ISBN-13:

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The research dealt with decision theoretic antenna processing systems and the development and application of a new coherence theory to optimum antenna system design. The objective was the development of techniques that would result in improved target parameter estimates and better detection and resolution capability than those achieved by conventional systems. A new theory was developed, called transcoherence theory. It can be used to determine the optimum amplitude and/or phase shading for an antenna that is intended as an information-gathering device. It is particularly useful when employed for the purpose of compensating for deleterious medium effects. The theory can also be used to find the coherence properties of sources, where these properties are essential to the specification of the a priori statistics of target signals and clutter. A relatively simple decision theoretic processor was built and found to improve angular resolution by at least a factor of four over that of conventional systems. The research studies and their results are documented in seven scientific reports and several papers. (Author).

Angular Resolution Beyond the Rayleigh Limit
Angular Resolution Beyond the Rayleigh Limit

Author: Aharon A. Ksienski

Publisher:

Published: 1966

Total Pages: 54

ISBN-13:

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The problem of angular resolution is formulated in a statistical decision theoretic context. A tutorial discussion of decision theory and its application to resolution is presented, and an explicit signal processing radar system is derived whose resolving properties approach an optimum. Computer simulation tests show that the system is capable of reliably resolving targets as close as a quarter of a 3-db beamwidth in the presence of noise and system errors. (Author).