Radio Direction Finding on High Frequency Short Duration Signals PDF Download
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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: 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
Author: United States. Department of the Army
Publisher:
ISBN:
Category : Navigation (Aeronautics)
Languages : en
Pages : 224
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Book Description
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: 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: 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:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 316
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Book Description
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1766
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Book Description
Author: Jack Milton Shulman
Publisher:
ISBN:
Category : Radio direction finders
Languages : en
Pages : 106
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Book Description
Author: Magnus Finne
Publisher: DIANE Publishing
ISBN: 0788135538
Category : Direction finding
Languages : en
Pages : 64
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Book Description
The use of spread-spectrum signals has increased dramatically in military radio communications. This report locates methods for direction-finding direct-sequence spread-spectrum (DS/SS) signals; digital methods are of special interest. A literature survey was conducted to see if there are any known methods. Investigated if a DS/SS detection method using a square-law detector can be extended to direction-finding. By use of computer simulations, show the performance of the methods found. Benefits and problems are also discussed.
