Short-haul communications using NVIS HF radio

Burgess, Samuel J.; Evans, N.E.

doi:10.1049/ecej:19990205

Cited by 11 publications

(13 citation statements)

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“…As explained in [Burgess and Evans, 1999], the ionosphere supports NVIS radio wave propagation when the frequency of the electromagnetic wave does not exceed the critical frequency of the highest ionospheric layer. During daytime this is the F2-layer.…”

Section: Experiments Designmentioning

confidence: 93%

“…Several tests have been conducted in the United Kingdom by Burgess [1999] and Tooby [1999 to characterize the NVIS channel. Their results can be used to simulate the influence of the channel, enabling performance testing of modulation and coding systems without on-air measurements [ITU-R Rec.…”

Section: Nvis Channel Characteristicsmentioning

confidence: 99%

“…The antenna height is optimized for NVIS propagation [Burgess, 1999]. A frequency is selected on which a sufficiently long period of F-layer NVIS propagation is expected.…”

Section: Near Vertical Incidence Skywave B a Witvliet Interaction Omentioning

confidence: 99%

“…Consequently, the skywave component of the radio noise is underestimated in most radio noise measurements. For research into Near Vertical Incidence Skywave (NVIS) propagation [Burgess, 1999] and communication over the NVIS channel [Hervás, 2013], radio noise arriving at steep elevation angles (see Chapter 4) must be taken into account. Therefore a different measurement antenna is desired.…”

Section: Introductionmentioning

confidence: 99%

“…In NVIS, electromagnetic waves are launched at steep elevation angles, typically between 70° and 90°, after which the waves are refracted in the ionosphere waves and land like droplets from a fountain in the area around the transmitter, as is depicted in Figure 6.1. A concise description of the NVIS propagation mechanism can be found in [Burgess, 1999].…”

Section: Introductionmentioning

confidence: 99%

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Near vertical incidence skywave

Witvliet

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Section: Experiments Designmentioning

confidence: 93%

Section: Nvis Channel Characteristicsmentioning

confidence: 99%

“…The antenna height is optimized for NVIS propagation [Burgess, 1999]. A frequency is selected on which a sufficiently long period of F-layer NVIS propagation is expected.…”

Section: Near Vertical Incidence Skywave B a Witvliet Interaction Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near vertical incidence skywave

Witvliet

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Radio communication via Near Vertical Incidence Skywave propagation: an overview

Witvliet

Alsina-Pagès

2017

Telecommun Syst

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Comparison of propagation predictions and measurements for midlatitude HF near‐vertical incidence sky wave links at 5 MHz

Walden

2012

Radio Science

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[1] Signal power measurements for a UK-based network of three beacon transmitters and five receiving stations operating on 5.290 MHz were taken over a 23 month period between May 2009 and March 2011, when solar flux levels were low. The median signal levels have been compared with monthly median signal level predictions generated using VOACAP (Voice of America Coverage Analysis Program) and ASAPS (Advanced Stand Alone Prediction System) HF prediction software with the emphasis on the near-vertical incidence sky wave (NVIS) links. Low RMS differences between measurements and predictions for September, October, November, and also March were observed. However, during the spring and summer months ($April to August), greater RMS differences were observed that were not well predicted by VOACAP and ASAPS and are attributed to sporadic E and, possibly, deviative absorption influences. Similarly, the measurements showed greater attenuation than was predicted for December, January, and February, consistent with the anomalously high absorption associated with the "winter anomaly." The summer RMS differences were generally lower for VOACAP than for ASAPS. Conversely, those for ASAPS were lower during the winter for the NVIS links considered in this analysis at the recent low point of the solar cycle. It remains to be seen whether or not these trends in predicted and measured signal levels on 5.290 MHz continue to be observed through the complete solar cycle.

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Short-haul communications using NVIS HF radio

Cited by 11 publications

References 0 publications

Near vertical incidence skywave

Near vertical incidence skywave

Radio communication via Near Vertical Incidence Skywave propagation: an overview

Comparison of propagation predictions and measurements for midlatitude HF near‐vertical incidence sky wave links at 5 MHz

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