Dynamic management of HF communication and broadcasting systems

Goodman, Jim; Ballard, J. William O.

doi:10.1049/ic:19990085

Cited by 6 publications

(4 citation statements)

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“…to fully utilise the enhanced E-layer. From an operational point of view a technique is needed to address the uncertainties generated by ionospheric disturbances on key ionospheric parameters and a number of authors have proposed, for example, the use of oblique and vertical sounding data to provide near real-time ionospheric maps and communication performance parameters (e.g., Zolesi et al, 2004;Goodman and Ballard, 1999). Certainly while each of these approaches has different applications and merits, the authors have chosen another approach.…”

Section: Discussionmentioning

confidence: 99%

Observations on the variability and screening effect of Sporadic-E

Ritchie

Honary

2009

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tSporadic-E is a problem in high latitude HF communications because of its irregular and as yet unpredictable behaviour. This paper characterises the change in E-layer critical frequency (f o E) that occurs in the four hours following a storm sudden commencement (SSC) event which is a precursor to magnetospheric storms which adversely affect ionospheric communications.Following checks for any seasonal or solar activity dependency in the data, further analysis determines the occurrence of full blanketing (screening) Sporadic-E layer formation at high latitudes as seen on vertical ionosondes in Northern Finland (671 Latitude). An appropriate threshold value of f o E is proposed that could be used following the commencement of ionospheric storms, indicating that there is a high probability that F-layer screening will occur. As far as the authors are aware this is the first statistical analysis of the onset of Sporadic-E following SSC.

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Section: Discussionmentioning

confidence: 99%

Observations on the variability and screening effect of Sporadic-E

Ritchie

Honary

2009

Journal of Atmospheric and Solar-Terrestrial Physics

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“…The use of modern techniques for monitoring of the ionospheric channel permits one to increase the reliability of SW communication systems up to 97−99%, i.e., to the level of reliability of satellite communication [1,2]. One of the effective methods of the ionosphericchannel diagnostics is chirp sounding.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal correlation of the maximum observable frequency on midlatitude radio lines

Бархатова

Uryadov

Vertogradov

et al. 2009

Radiophys Quantum El

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We present the results of studying the spatial and temporal correlation of the maximum observable frequency on two midlatitude paths, Inskip (England)-Rostov-on-Don and Cyprus-Rostov-onDon. Dynamics of variation in the maximum observable frequency on these paths as a function of the time of the day and geophysical conditions is explored. The presence of a high spatial correlation (up to 93.5%) between the studied maximum observable frequencies allowed the values of the maximum observable frequency on the Cyprus-Rostov-on-Don path to be retrieved from the data on the Inskip-Rostov-on-Don path by the method of artificial neural networks with a training efficiency of up to 97%.

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“…The tests of HF radio-communication systems, both in Russia [1] and abroad [2], with the operating communication frequencies assigned in accordance with oblique chirp sounding in real time show the possibility of increasing the reliability of HF communication up to the level of the satellite communication systems.…”

Section: Introductionmentioning

confidence: 99%

Calculation of optimal operating frequencies of a communication radio line according to oblique ionosphere sounding

Vertogradov¹,

Uryadov

Vertogradova³

2008

Radiophys Quantum El

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A hardware-software complex for real-time automatic determination of the optimal operating frequencies of a communication radio line according to oblique chirp ionosphere sounding is created. Path tests of the chirp complex on midlatitude radio lines are performed. Bit error probability and the reliability of HF communication for narrow-band and broadband communication systems are estimated from the results of oblique chirp sounding. It is shown that the quality of a communication channel greatly depends on the ratio of the regular and fluctuation components of a signal, as well as on the magnetic activity level. The created chirp complex can be used as a part of the ionospheric-wave and frequency-control service for dynamic management of the radioline frequency resource in the interests of efficient operation of different-purpose radioelectronic systems.

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Dynamic management of HF communication and broadcasting systems

Cited by 6 publications

References 0 publications

Observations on the variability and screening effect of Sporadic-E

Observations on the variability and screening effect of Sporadic-E

Spatio-temporal correlation of the maximum observable frequency on midlatitude radio lines

Calculation of optimal operating frequencies of a communication radio line according to oblique ionosphere sounding

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