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Author: A. C. Stewart
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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Book Description
The program included the testing and evaluation of commercial and military field-strength meters. It also included a study of the interpretation of field-strength measurement data taken under multipath conditions. As part of the field-strength meter evaluation, five instruments, the AN/TRM-7, NF-105, NF-112, FIM-B2, and the NM-30A were laboratory tested and the results have been previously reported. One of the difficulties in the interpretation of the measured data is the variability of field-strength values obtained over an area. Such variability is caused by the presence of multipath components. The principle of aperture-synthesis has been applied to this problem by Watterson. Using field-strength values measured over an area, the contributions of the individual components to the field can be identified. A computer program was prepared to make the necessary computations. The principle was verified first by simulated field data and then experimentally. The results of the program verify the usefulness of the asperture-synthesis technique for the measurement of multi-component fields. (Author).
Author: A. C. Stewart
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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Book Description
The program included the testing and evaluation of commercial and military field-strength meters. It also included a study of the interpretation of field-strength measurement data taken under multipath conditions. As part of the field-strength meter evaluation, five instruments, the AN/TRM-7, NF-105, NF-112, FIM-B2, and the NM-30A were laboratory tested and the results have been previously reported. One of the difficulties in the interpretation of the measured data is the variability of field-strength values obtained over an area. Such variability is caused by the presence of multipath components. The principle of aperture-synthesis has been applied to this problem by Watterson. Using field-strength values measured over an area, the contributions of the individual components to the field can be identified. A computer program was prepared to make the necessary computations. The principle was verified first by simulated field data and then experimentally. The results of the program verify the usefulness of the asperture-synthesis technique for the measurement of multi-component fields. (Author).
Author: Arthur C. Stewart
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Book Description
The measurement of the strength of radio frequency fields at high frequency and above has followed practices which are standard for the measurement of field strength at medium and low frequencies. Variability of measurements made in practical situations and a lack of reproducibility of measurements made under apparently identical conditions has prompted an investigation of equipment and methods used in the determinations. The field strength measurement study was undertaken to understand the nature of the problem and to develop techniques for more accurate determinations of field strength and more significant interpretation of measured data. A Stoddart Aircraft Company NM-52A field strength meter which has a frequency range of 375 to 1000 MHz was calibrated and evaluated using conventional methods. Instrumentation to extend the upper frequency limit of the testing procedure from 10 to 20 GHz was procured. Field strength meter antennas in the 2 to 4 GHz frequency range were tested and comparisons made with similar tests conducted by RADC. Methods of simplification of data acquisition and processing for use in aperture synthesis were investigated. (Author).
Author: Arthur C. Stewart
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Author: Central Radio Propagation Laboratory (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Author: A. H. LAGRONE
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Category :
Languages : en
Pages : 1
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Author: Tadao Inami
Publisher:
ISBN:
Category : Radio waves
Languages : en
Pages : 410
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Author: Boulder Laboratories (U.S.)
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ISBN:
Category :
Languages : en
Pages : 13
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Author: J. Miedzinski
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ISBN:
Category :
Languages : en
Pages : 78
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Author: Donald E. Rugg
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 50
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Author: W. G. Baker
Publisher:
ISBN:
Category : Radio measurements
Languages : en
Pages : 32
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