Fast and accurate calculation of multipath spread from VOACAP predictions

Stocker, A. J.

doi:10.1029/2011rs004965

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…VOACAP generally provides accurate estimates of the ionospheric channel [11]. VOACAP simulation results are depicted in figure 7(a), 8(a) and 9(a), respectively.…”

Section: Prediction and Measurement Results Comparationmentioning

confidence: 99%

“…However, they have an inherent limitation because of the nature of underlying databases are average monthly based. Therefore, the estimation could not work in a period of daily bases [11]. However, real-time channel evaluation (RTCE) able to select maximum observed frequency (MOF) estimate, and consequently, its be able to select the best available frequency for short term and real time operation [7].…”

Section: Hf Ionospheric Performance Predictionmentioning

confidence: 99%

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A Simplified Sounding System for Finding NVIS Channel Availability to Support Government Radio Networks in Indonesia

Dutono

Zakariyah

Santoso

et al. 2019

emitter

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MostlyÂ natural disasters in Java Island such as landslides are within the vicinity of not more than 200 Km from the district capital. Cellular communications require complex systems and rather vulnerable Â to cope with disasters. NVIS mode is considered as a simple radio link during disaster mitigation initiation process. It needs a valid estimation to figure out the condition of the ionosphere. There are two purposes of this study, the first of which is an attempt to find out a fact the existences of authorized HF users who still work in the band of 3 MHz â€“ 10 MHz.Â The second is to integrate low cost HF radio communication, commonly available small single board computer hardware, and opensource software, to build a sounding system to evaluate the quality of NVIS channels. Prediction system such VOACAP give hourly prediction data, however it has an inherent limitation because ofÂ Â nature the underlying databases is monthly average based, therefore, the estimation could not be made in a daily bases. However, a real-time channel evaluation (RTCE)Â able to purify maximum observed frequency (MOF) estimation, and consequently, its able to select the best available frequency for short termÂ and real time operation. In this study, we used WSPR to perform a simple RTCE technique. Furthermore, we also reviewed the current regulatory status regardingÂ the availability of sub-10 MHz band for NVIS radio operation. The results show that discrepancies between simulation and measurement are occurred mainly because of sporadic data in the band of 60m and 80m. However, all of the measurement results and simulations almost have the same agreement regarding the quiet period between local midnight and local sunrise. The results of measurements show that 60m band is the most reliable NVIS channel between local sunrise and local midnight. Furthermore, 100 watts is a proper transmitter power to reach the required SNR for reliable voice communication.Â

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“…VOACAP generally provides accurate estimates of the ionospheric channel [11]. VOACAP simulation results are depicted in figure 7(a), 8(a) and 9(a), respectively.…”

Section: Prediction and Measurement Results Comparationmentioning

confidence: 99%

Section: Hf Ionospheric Performance Predictionmentioning

confidence: 99%

A Simplified Sounding System for Finding NVIS Channel Availability to Support Government Radio Networks in Indonesia

Dutono

Zakariyah

Santoso

et al. 2019

emitter

View full text Add to dashboard Cite

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“…However, the LQA table can be initialized according to environmental conditions and geographical location between different nodes, using tools such as AREPS or VOACAP, and its details are discussed in [15], [16], [17], [18].…”

Section: System Model Of Proposed Fh-ale Protocolmentioning

confidence: 99%

Improving the Performance of HF Radio Networks in Presence of Interference: Frequency Hopping Automatic Link Establishment

Haghbin

Khodaverdizadeh

Razzazi

2022

Preprint

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Automatic Link Establishment (ALE) is crucial in channel assignment and data exchange in HF radio networks. The time of link establishment and its quality are two main concerns in this criterion establishment. In jamming environments, the quality of the channels is seriously influenced by the jammer signals. Frequency Hopping (FH) approaches supports communication links to overcome the jamming impairments, and the traditional ALE algorithm can be made more stable by using this approach. This paper has developed ALE algorithms to automatically establish links to handle different jamming scenarios and establish robust links to exchange data with the proposed FH-ALE system. Besides, in the proposed algorithm, we have considered the time of link establishment to be almost identical to the current ALE scenario. Hence, in the normal channel condition, the throughput value is approximately identical in proposed and traditional cases. The simulation results represent the superiority of the proposed FH-ALE approach in jamming environments.

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“…The A parameter is a linear variable that represents the magnetic field of the earth. The previous papers [1][2][3][4][5][6][7][8][9][10] focused on the comparison of prediction programs at different geomagnetic circuits and different solar activity without mention to the Iraqi HF circuit link, while [11,12] studied the ionospheric parameters for Iraq's zone only when solar winds were at their maximum. The novelty of this work is studying and comparing the propagation prediction for the HF circuit link from Iraq to the world at the solar wind's minimum using the Voice of America Coverage Analysis Program (VOACAP), ITU Recommendation RS 533 (REC533), and real radio contact during August 2018; and also to find which modulation is preferred digital mode like FT8 [13] or analogue.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Prediction Programs for Short Wave Circuit Link from Iraq to Test points on Both Earth Hemispheres during Solar Minimum

Hasan

2021

alkej

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This paper compare the accurecy of HF propagation prediction programs for HF circuits links between Iraq and different points world wide during August 2018 when solar cycle 24 (start 2009 end 2020) is at minimun activity and also find out the best communication mode used. The prediction programs like Voice of America Coverage Analysis Program (VOACAP) and ITU Recommendation RS 533 (REC533 ) had been used to generat HF circuit link parameters like Maximum Usable Frequency ( MUF) and Frequency of Transsmision (FOT) .Depending on the predicted parameters (data) , real radio contacts had been done using a radio transceiver from Icom model IC 7100 with 100W RF power, tuner box and homemade dipole antenna of 10 m length and 8m height above ground. From correlation between the predicted data and observed data the result was not accurate .

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Fast and accurate calculation of multipath spread from VOACAP predictions

Cited by 7 publications

References 15 publications

A Simplified Sounding System for Finding NVIS Channel Availability to Support Government Radio Networks in Indonesia

A Simplified Sounding System for Finding NVIS Channel Availability to Support Government Radio Networks in Indonesia

Improving the Performance of HF Radio Networks in Presence of Interference: Frequency Hopping Automatic Link Establishment

Comparison of Prediction Programs for Short Wave Circuit Link from Iraq to Test points on Both Earth Hemispheres during Solar Minimum

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