Rapid hydrometeor bistatic scatter calculations using non-orthogonal function expansion of reflectivity profiles

Sitorus, S. P.; Glover, Ian

doi:10.1002/1099-1247(200005/06)18:3<207::aid-sat683>3.0.co;2-i

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…The study on the impact of interference based on the evaluation of bistatic interference on communication paths 2 International Journal of Antennas and Propagation has drawn much attention at the temperate and the tropical region. The report of some researchers at the temperate region includes the works of Crane [4], Awaka [5], Capsoni et al, [2], Olsen et al, [6], Holt et al, [7], Capsoni and D' Amico [8], and Sitorus and Glover [9] to mention but few, while at the tropical region and mostly in Nigeria are the works of Ajewole et al, [10,11], Ajewole and Ojo [3], Ojo et al, [12], and Ojo and Joseph-Ojo [13] among others. In the previous works, the subtropical climate has always been categorized under the tropical region.…”

Section: Introductionmentioning

confidence: 99%

Bistatic Scattering due to Hydrometeors on Cochannel Intersystem Communication Links over a Subtropical Path

Owolawi

Wallingo

2014

International Journal of Antennas and Propagation

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The performance of fixed satellite systems in the shared frequency band depends on the tolerance level of interference between them. Interference disturbs the functionality of the ground station and causes signal degradation. The knowledge of interference level must therefore be known for an optimal satellite design. In this work, we evaluate interference due to hydrometeors for a situation in which a satellite downlink signal is affected by the signal from a terrestrial microwave network operating at the same frequency as the satellite system in a subtropical station: Durban, South Africa. The evaluation of the transmission loss is based on the modified 3D bistatic radar equation and the exponential rain cell model for the scattering. The results of intersystem interference for different station separation over frequencies variation, terrestrial antenna gains, and exceedance probabilities are presented. The effect of the additional rain attenuation(Aw)on the satellite signals is also examined. The results point out to some remarkable attenuation differences between the effective transmission loss and the transmission loss statistics for small time unavailability at the frequencies considered in this work. This could be detrimental in link budget design if overlooked.

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Section: Introductionmentioning

confidence: 99%

Bistatic Scattering due to Hydrometeors on Cochannel Intersystem Communication Links over a Subtropical Path

Owolawi

Wallingo

2014

International Journal of Antennas and Propagation

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“…Considering the tremendous work carried on by some notable researchers [4][5][6][7][8][9][10][11][12] to mention but a few, there is no doubt that the subject of interference studies has received much attention, mostly in the temperate region. In the tropical region, the subject also received some attention mostly in Nigeria [2,3,[13][14][15][16][17].…”

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confidence: 99%

Estimation of Effective Transmission Loss Due to Subtropical Hydrometeor Scatters using a 3D Rain Cell Model for Centimeter and Millimeter Wave Applications

Ojo

Owolawi

2014

J Infrared Milli Terahz Waves

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The problem of hydrometeor scattering on microwave radio communication down links continues to be of interest as the number of the ground and earth space terminals continually grows The interference resulting from the hydrometeor scattering usually leads to the reduction in the signal-to-noise ratio (SNR) at the affected terminal and at worst can even end up in total link outage. In this paper, an attempt has been made to compute the effective transmission loss due to subtropical hydrometeors on vertically polarized signals in Earthsatellite propagation paths in the Ku, Ka and V band frequencies based on the modified Capsoni 3D rain cell model. The 3D rain cell model has been adopted and modified using the subtropical log-normal distributions of raindrop sizes and introducing the equivalent path length through rain in the estimation of the attenuation instead of the usual specific attenuation in order to account for the attenuation of both wanted and unwanted paths to the receiver. The co-channels, interference at the same frequency is very prone to the higher amount of unwanted signal at the elevation considered. The importance of joint transmission is also considered.

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An Estimate of Interference Effect on Horizontally Polarized Signal Transmission in the Tropical Locations: A Comparison of Rain-Cell Models

Ojo¹,

Joseph-Ojo²

2008

PIER C

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With the recent growth in the use of satellites for an increasing range of devices, services, applications and users, there is a need to optimize the signal received for availability, reliability and tolerance to interference. A lot of prediction models have been used in recent times to estimate intersystem interference due to hydrometeor scattering on vertically polarized microwave signals into the receiver of earth-space communications systems operating at the same frequency. The horizontal polarization is usually not investigated because coupling between the transmitting and receiving systems is much less than in vertical polarization. Much as this is true in the temperate regions, the nature and characteristics of tropical rainfall which are quite distinct from the temperate rainfall, means that the horizontal polarization when transmitted should be investigated for hydrometeor induced interference in tropical regions. This present work computes transmission loss on horizontally polarized signals based on two models (Awaka and Capsoni). The results obtained are compared and it is observed that there is only a difference of 1 dB in the transmission loss between the models. However, at higher frequency (> 20 GHz), the Capsoni model does not produce values for the transmission loss L, while Awaka model predict a low interference at various antenna gain for percentages of time > 0.1%.

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Rapid hydrometeor bistatic scatter calculations using non-orthogonal function expansion of reflectivity profiles

Cited by 3 publications

References 7 publications

Bistatic Scattering due to Hydrometeors on Cochannel Intersystem Communication Links over a Subtropical Path

Bistatic Scattering due to Hydrometeors on Cochannel Intersystem Communication Links over a Subtropical Path

Estimation of Effective Transmission Loss Due to Subtropical Hydrometeor Scatters using a 3D Rain Cell Model for Centimeter and Millimeter Wave Applications

An Estimate of Interference Effect on Horizontally Polarized Signal Transmission in the Tropical Locations: A Comparison of Rain-Cell Models

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