A Wide-Aperture HF Direction-Finder with Sleeve Antennas PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
Author: Raymond F. Gleason
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
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Book Description
The requirement has arisen for the development of facilities in the high-frequency region which will permit simultaneous message interception and instantaneous direction finding with a common antenna array. Preliminary study indicates that the most promising technique to meet these requirements would be a circularly disposed antenna array such as a Wullenweber system having a wide aperture, provided such a system could be designed and constructed with reasonable economy. The use of a wide aperture system should considerably reduce electrical interference and both site and wave interference errors. Preliminary studies of the system have been made using a circular array of vertical half-rhombic antennas. The resulting beam of the phased array exhibited variations in indicated bearings attributed to polarization changes and reduced its effectiveness in direction finding. Future studies and plans are outlined for an array using sleeve monopoles. (Author).
Author: Louis A. Gebhard
Publisher:
ISBN:
Category : Electronics in military engineering
Languages : en
Pages : 472
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Author:
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 474
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Book Description
Author: Herndon H. Jenkins
Publisher: Artech House Radar Library (Ha
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
Operating principles - Performance difinition - Direction-finding error sources - System level descriptions - Representative operational small-aperture - Passive geolocation - Subsystem considerations - Calibration and test of direction-finding systems.
Author: P. J. D. Gething
Publisher: IET
ISBN: 9780863412387
Category : Science
Languages : en
Pages : 392
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Book Description
Enlarged and revised second edition. Modern direction finders, capable of measuring elevation angles as well as azimuth angles on the components of multi-ray wavefields, have become powerful tools for research in ionospheric physics and HF radio propagation. The complexity of the problem of resolving closely-spaced rays requires the combined use of wide aperture antenna arrays, multichannel receiving systems and sophisticated digital processing techniques.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 146
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Book Description
Author: Joseph D. Moell
Publisher: McGraw Hill Professional
ISBN: 9780830627011
Category : Sports & Recreation
Languages : en
Pages : 342
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Book Description
This book contains all the information needed to set up and perform radio direction finding on HF and VHF bands.
Author: Dennis Dean Sheppard
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The feasibility of accomplishing high frequency direction finding against short duration (100-1000 ms) HF skywave signals using narrow aperture antennas is investigated. Two statistical procedures for estimating the signal bearing are proposed and compared. These procedures employ time averaging to reduce the large instantaneous bearing error caused by the phase and amplitude distortion of the wavefront due to scattering and multipath interference. Results are presented using data collected with the Southwest Research Institute Coaxial Spaced Loop HFDF system. It is shown that for a limited sample of data from this system the standard deviation of the bearing estimate for a 200 ms signal varied from 15 to 59 degrees. (Author).
Author: David William Watson
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
