Improved theoretical formula for the relationship between rain attenuation and depolarisation

Fukuchi, Hajime; Awaka, Jun; Oguchi, T.

doi:10.1049/el:19840583

Cited by 17 publications

(12 citation statements)

References 4 publications

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“…The U and V coefficients for a particular situation where experimental data are available can be found by (XPD, A) data pairs with a least-square error regression analysis on (1), where A is the rain attenuation. The ITU-R P.618-8 model [15], CHU model [16], Dissanyake et al model [17], Fukuchi et al model [18] and simple isolation model (SIM) [10] are used to predict the measured XPD. All models are of the form in (1), differing only in the functions used to represent U and V in terms of site and system parameters.…”

Section: Experimental Configurationmentioning

confidence: 99%

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Microwave depolarization versus rain attenuation on earth space in Malaysia

Mandeep

2008

Satell Commun Network

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SUMMARYThe wave propagation experiments using Japanese geostationary satellite Superbird-C have been performed at the Universiti Sains Malaysia earth station. A relationship between rain depolarization and attenuation, valid for earth-space path at microwave wavelengths, is presented. Cumulative rain attenuation and cross-polarization discrimination (XPD) statistics are given for the period of 4 years (2002)(2003)(2004)(2005) at 12.255 GHz. XPD varied from 44 dB at 1% to 16 dB at 0.001% of time the abscissa is exceeded. Comparisons were made with available data sets and with five simple XPD models and the results indicate a good performance by the simple isolation model and the CHU model compared with the others. These results serve as checks on the theoretical models needed for predicting communication system performance in geographical regions especially for equatorial climate where measurements are not available.

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Section: Experimental Configurationmentioning

confidence: 99%

“…The XPD of linear polarization can be related to that of circular polarization via a two-tier Gaussian model for rain. The expression of the linear polarization is given as The values for V can be obtained from Equation (8), l is the path length and the values for p and q are given in Table 2 of Fukuchi et al [18].…”

Section: Experimental Configurationmentioning

confidence: 99%

Microwave depolarization versus rain attenuation on earth space in Malaysia

Mandeep

2008

Satell Commun Network

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“…F is the fraction of non-spherical raindrops, with a recommended value of 0.65.¸is the path length through rain in km. The values of the parameters S, C, D and < are shown in Table I for the models presented by E ITU-R [3]; E Dissanayake, Haworth, and Watson [4] (&DHW'); E Chu [5]; E Stutzman and Runyon [6] (&SR'); E Nowland, Olsen and Shkarofsky [7,8] (&NOS').…”

Section: Existing Models Of the Xpd}cpa Relationmentioning

confidence: 99%

“…Stutzman and Runyon themselves used a Marshall}Palmer DSD and scattering coe$cients based on those from Uzunoglu, Evans and Holt, and came to a C of 17.3 for 10(f(30 GHz. Fukuchi et al [8] found from their calculations of scattering coe$cients of Pruppacher}Pitter-shaped raindrops a value for C of 26 for a Marshall}Palmer DSD (10(f(40 GHz), 20.5 for a Joss-thunderstorm DSD (10(f(30 GHz), and 30 for a Joss-drizzle DSD (13(f(40 GHz). Thus, it is found that, depending on the assumed drop size distribution, C can vary between about 17 and 30 for f between 10 and 30 GHz.…”

Section: Dependence On Frequencymentioning

confidence: 99%

Depolarization due to rain: the XPD–CPA relation

Kamp

2001

Int. J. Satell. Commun.

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SUMMARYIt is already well known that there is a correlation between XPD and CPA due to rain. The average relation between them can be used to derive depolarization statistics from attenuation statistics. The relation depends on frequency, elevation angle, polarization, and the temporal and spatial spread of the canting angles of the raindrops. Several di!erent measurement results and models for the relation have been published since 1980. In this paper, a large group of published measurement results from di!erent sites is used to assess the di!erent dependencies of the model. The frequencies of the measurements range from 11 to 50 GHz, and the elevation angles from 3 to 503. The polarization angles vary from 0 to 1803, also including measurements at circular polarization, which is e!ectively equal to linear polarization at an angle of 453. Because of this large group of measurement results, it is possible to select each time, a group of measurements which are equal in all but one parameter, to study each dependency of the model separately. The di!erent dependencies are optimized, leading to the formulation of a new general model for the relation between XPD and CPA.

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“…The cross-polarization can be calculated theoretically, using the rainfall rate, the attenuation due to rain, the DSD, the forward scattering amplitude of the raindrops [13,14], the velocity of the rainfall [15], and the raindrop diameters [16]. Then, Fukuchi [17,18] improved Nowland's equation by using many DSDs, such as the MP DSD, the Joss thunderstorm DSD, and the Joss drizzle DSD, which they calculated up to 40 GHz. In this paper, in order to support the future use of a higher frequency band, we use a new DSD model to calculate the cross-polarization approximation up to 100 GHz.…”

Section: Introductionmentioning

confidence: 99%

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

Chodkaveekityada

Fukuchi

2017

Satell Commun Network

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SUMMARYIn addition to attenuation, depolarization due to rain is another factor that degrades satellite propagation signals, especially in the higher frequency bands and in places that have high rates of rainfall. A formula to predict cross-polarization as a function of attenuation has been proposed, and it is derived by a theoretical calculation using frequency, the forward scattering amplitude of raindrops, rainfall rates, the raindrop size distribution (DSD), and various other propagation parameters. In this paper, a formula for predicting cross-polarization is derived on the basis of the assumption of a gamma-type DSD up to 100 GHz. These results are compared with conventional exponential-type DSDs, such as the Marshall-and-Palmer DSD. Moreover, for a more realistic propagation situation, we consider the effect on the aforementioned relationship of rainfall rate inhomogeneity along the propagation path. It is shown that, for practical purposes, this inhomogeneity does not have a significant effect on satellite propagation.

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Improved theoretical formula for the relationship between rain attenuation and depolarisation

Cited by 17 publications

References 4 publications

Microwave depolarization versus rain attenuation on earth space in Malaysia

Microwave depolarization versus rain attenuation on earth space in Malaysia

Depolarization due to rain: the XPD–CPA relation

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

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