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Saturday, November 28, 2020 | History

2 edition of Earth-space attenuation prediction procedures at 4 to 16 GHz found in the catalog.

Earth-space attenuation prediction procedures at 4 to 16 GHz

E. J Dutton

Earth-space attenuation prediction procedures at 4 to 16 GHz

  • 338 Want to read
  • 23 Currently reading

Published by Dept. of Commerce, Office of Telecommunications in Washington .
Written in English

    Subjects:
  • Artificial satellites in telecommunication,
  • Rain and rainfall,
  • Precipitation (Meteorology) -- Measurement,
  • Probability forecasts (Meteorology)

  • Edition Notes

    StatementE. J. Dutton ; Institute for Telecommunication Sciences
    SeriesOT report ; 77-123
    ContributionsInstitute for Telecommunication Sciences, United States Postal Service
    The Physical Object
    Paginationviii, 81, [1] p. :
    Number of Pages81
    ID Numbers
    Open LibraryOL17954999M

    CCIR needs in earth‐space radio propagation CCIR needs in earth‐space radio propagation Dougherty, H. T. CCIR Study Group 5, Westminster,Colorado (Received ; revisedJ ; accepted J ) The contextand role of the CCIR is briefly summarized. Attenuation due to rain is an important limitation in the designing of the microwave communication links operating at frequencies above 10 GHz. Video conferencing performs over high-speed link via high-speed satellite (WINDS satellite) transmission in the Ka-band which is vulnerable to attenuation due to rain. Using the ITU-R proposed models for the prediction of rain attenuation Author: Charles Duhujamahoro, Celestin Twizere, Patrick Mazimpaka, Thierry Ony Shema, Nkurunziza Pascal. Earth space communication link, especially for frequency above 10 GHz. However, to establish an Earth to space communication link for propagation studies is very costly. Radar reflectivity data therefore becomes an attractive alternative for rain attenuation estimation and prediction. The Radar reflectivity data is commonly used for rain. Rain fade refers primarily to the absorption of a microwave radio frequency (RF) signal by atmospheric rain, snow, or ice, and losses which are especially prevalent at frequencies above 11 also refers to the degradation of a signal caused by the electromagnetic interference of the leading edge of a storm front. Rain fade can be caused by precipitation at the uplink or .

    converted into attenuation by means of the relation 10−5Z ; which was obtained through a best fit procedure. The above relation was converted into the corresponding ones for the other satellite frequencies; 10−4Z at 40 GHz and 10−4Z at 50 GHz following the analytical procedure outlined in the previous.


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Earth-space attenuation prediction procedures at 4 to 16 GHz by E. J Dutton Download PDF EPUB FB2

Get this from a library. Earth-space attenuation prediction procedures at 4 to 16 GHz. [E J Dutton; Institute for Telecommunication Sciences.; United States Postal Service.; United States.

Department of Commerce. Office of Telecommunications.]. Dutton, E. J., “Earth Space Attenuation Prediction Procedure at 4 to 16 GHz,” OT ReportOffice of Telecommunications, Boulder, CO, May “Nationwide Long-Term Rain Rate Statistics and Empirical Calculation of 11 GHz Microwave Rain Attenuation,” The Bell System Technical Journal, Vol.

56 Buy this book on publisher's Cited by: 5. The prediction method described in § is the most accurate and is preferred. The simplified prediction method described in § may be used for separation distances less than 20 km; however, it is less Size: 1MB.

Absl_ This report provides the path loss and noise estimation procedures as the basic input to systems design for earth-to-space microwave links operating at frequencies from I to GHz.

Topics covered include gaseous absorption, attenuation by rain, scintillation. ‘Propagation data required for earth-space t el co mu ni asy ’. D b r, G v 5 Ong.J.T. and Zhu,C.N. Slant path attenuation at 11 GHz in Singapore’. Electronic Letters, 33, (13), pp 6 CCIR Report Attenuation by hydrometeors, in particular precipitation, an other atmospheric particles’ Dusseldorf.

Step 4: For path elevation angles in the range 20    7, the fade distribution is assumed to have the same value as at   20. Figure 1 shows fades exceeded at GHz versus elevation angles between 10 and 60 for a family of equal percentages between 1% and 50%.

Rain attenuation of Ku-band beacon signal over an earth-space link has been measured by a receiving signal at frequency GHz transmitted with circular polarization from satellite Koreasat 6, situated at °E at an elevation angle of 45° since The sampling interval of the data acquisition used in the present study is 10 second which is averaged over 1-minute Cited by: 1.

Prediction of attenuation statistics for an average year The general method to predict attenuation due to precipitation and clouds along a slant propagation path is presented in § On the Prediction of Joint Rain Attenuation Statistics in Earth-Space Diversity Systems Using Copulas Article (PDF Available) in IEEE Transactions on Antennas and Propagation in press(4).

PREDICTION OF GASEOUS ATTENUATION ON EARTH-SPACE PATHS The mean attenuation of gases on earth-space paths in the10 to GHz frequency range has been theoretically modeled and experi-mentally measured.

Above 20 GHz gaseous absorption can have a sign-ificant effect on a communication system design depending on the specific File Size: 2MB. At GHz Ku-band frequency, the rain attenuation at % of time (A ) is approximately dB and reached approximately dB at % of the time, whereas A reached approximately 83 dB if the signal was transmitted at 22 GHz Ka-band carrier frequency.

The elevation angle is a highly effective parameter for the signal quality Cited by: 4. attenuation for Earth-space applications ( GHz range) is maximizes the prediction accuracy in the whole GHz A Simplified Model to Predict Oxygen 9 Wien OS 10 Milan IT 11 Brindisi IT 7 12 Trapani IT 5.

model. In the final stage the regional and global attenuation maps are prepared by a contouring procedure, depending on exceedance probabilities, frequency, polarization and satellite position.

Rainfall intensity and attenuation maps for all possible Earth -space links at frequencies between 10 30 GHzAuthor: R. Bahri, S.H. Maddah Hosseini, L. Mohammadi, H. Yarmohammadi. The rain attenuation of Ku-band signal over an earth-space path has been measured by receiving a signal at frequency GHz transmitted with horizontal polarization from satellite NSS-6 (geostationary at E) at an elevation of at Kolkata, India (22°34’ N, 88°29’ E), a tropical location, since June [4].

The sampling. IEEE TRANSACTIONS ON COMMUNICATIONS,NO. 10, OCTOBER -*-I Rain Rate (rnrn/hr) Fig. Comparison of five years of. However, rain-induced attenuation is the major issue at frequencies above 10 GHz, more especially in tropical regions which experience heavier rainfall intensities [1].

Rain attenuation plays significant role in the design of terrestrial and Earth-satellite radio links especially at frequencies above 10 GHz [2].Cited by: Fig.

1 shows the schematic presentation of an Earth Space path giving the parameters to be input into the attenuation prediction process where A denotes frozen precipitation, B denotes rain height, C denotes liquid precipitation and D denotes Earth–Space path.

The specific attenuation is (dB/km) for % of time is given by, Ô Û 4 ä 4 5. The following procedure gives estimation of the long–term statistics of the slant–path rain attenuation at a given location for frequencies up to 55 GHz.

4, Aug [2] F. Moupfouma, “Improvement of a Rain Attenuation Prediction for Terrestrial Microwave Links,†IEEE Transaction On Antenna s and Propagation, vol Cited by: 3.

The method for the prediction of rain attenuation on microwave paths has been grouped into two categories (Kestwal et al., establishes the procedure of specific attenuation from the rain intensity.

For instance, the calculated rain attenuation values at 75 GHz link are, dB at %, % and % of the time and the Cited by: [16] Figure 3 shows the attenuation plots for Durban which lies in the Coastal Savannah region of South Africa with an average R of mm/h. At both frequencies (10 GHz and 40 GHz), the ITU‐R model gives the lowest attenuation values, while the Moupfouma model gives the highest attenuation prediction along the propagation by: 0 1 5GHz I I I I I I I I I I I 0 4 8 12 16 20 24 Surface Water-Vapor Density, gm/m**3 Figure 3: The Resch atmospheric-attenuation program agrees fairly well with Waters’s formulas.

expert on the behavior of the earth’s atmosphere at centimeter and millime-ter wavelengths, and he has a series of carefully done atmospheric models. The L eff values are 20, and 40 GHz. The attenuation values for other percentages of time were computed using statistical methods.

The proposed model is a modification of ITU () rain attenuation prediction by: 3. Abstract: Hydrometeors are one of the most dominant factors for terrestrial and satellite communication systems link performance at frequencies above 10 GHz, increasing rapidly at higher frequencies.

The prediction of time dynamics of the rain attenuation may be required to improve the efficiency of various techniques to reduce attenuation such as. Attenuation on a Terrestrial Path. 31 Attenuation on an Earth-Space Path 33 3. COMPARISON BETWEEN PREDICTED AND MEASURED ATTENUATION VALUES 40 Terrestrial Path Observations 42 Earth-Satellite Path Observations 50 Summary 56 4.

PREDICTION OF JOINT ATTENUATION STATISTICS 58 Joint Statistics Model 58 Cited by: 1. The simple attenuation model (SAM) [Stutzman and Dishman, ] is applicable for prediction at frequency range from 10 to 35 GHz, with antenna elevation angle from 10° to 65°.

The model uses attenuation versus rainfall rate calculation procedure together with rainfall rate statistics to produce attenuation by: The most classical approach of determining rain attenuation for radio-wave frequency has been to theoretically determine the specific attenuation.

At frequency over 10 GHz, rain and precipitation can influence the attenuation a lot; the effect of atmospheric attenuation between the source and destination over wireless communication is of major concern and a proper site Cited by: Figure 6 shows the geometry of the Earth-space radio-link adopted during the NEFOCAST project, where γ is the elevation angle (about 40° in this case).

The smart-LNB provides the total attenuation (in dB) along the radio path between satellite and the by: 4. and Prediction Procedures CIRain Attenuation Modeling Procedure [P] - Precipitation Distributions and Global Maps [] - Specific Attenuation Coefficients[P - Rain [P] OAtmospheric Gaseous Attenuation Model [P] / - Reference Standard Atmosphere [P’ - Surface Water Vapor Density [P].

The increase of data traffic, a demand for high-speed reliable mobile networks and congested frequency bands raised both technological and regulatory challenges. Therefore, the fifth-generation mobile network (5G) is being developed. Recently, researchers have focused on a very promising terahertz (THz) band (frequencies from GHz to 30 THz), which will allow Author: Milda Tamosiunaite, Stasys Tamosiunas, Mindaugas Zilinskas, Gintaras Valusis.

attenuation formula [], channel rain attenuation is computed with the input of the rain rate then system parameter such as transmission power and so on are obtained. According to figure 3, the rain rate of mm/hour is obtained for the % disconnection time of the year.

Using the value of mm/hour, channel rain. Interference effects are of utmost importance to the reliable design of modern satellite communication systems operating at Ku and Ka bands. In these frequencies rain attenuation is the dominant fading mechanism particularly for Earth-space systems located in subtropical and tropical regions.

On the other hand, the main propagation effect on Cited by: Rain attenuation model for South East Asia countries The specific attenuation, g, is a function of the rainfall rate, R, exceeded at % of time is given by: A model for predicting rain attenuation on Earth-to-space is developed by using the measured data obtained from tropical and equatorial regions that was revised from the ITU model.

loss exponent of the predictions made by the COST Hata model. To evaluate the applicability of the model for the COST GHz band, the model predictions are based on the measurements from three different environments namely urban,sub urban and the ,as per our paper we considered only the urban environment Size: KB.

Coaxial Transmission Lines e r In (D c /d c) D i + d d i - d The depth of penetration illustrates the skin effect.

It is defined as the thickness of a thin surface layer (assumed to have an even distribution of current flow), having the same resistance as an actual conductor, which is undergoing to the skin Size: KB.

frequency bands [23]. For the GHz frequency, the attenuation over distance has been calculated from an extensive experimental set of data in [24], on the grounds of Eq.2 (40 dB stands for reference path loss at GHz): 10 EIRP dBm P dBm n d dB() ()10log 40r a d −− − = (2) For the calculations in [24], three different methods have.

bands namely, ({)MHz, ({)GHz and ({)GHz have been used in the measurement campaign. It has been noticed that the door attenuation is higher than 40dB at the GHz band.

In [10], the outdoor-to-indoor propagation loss measurements for broadband wireless access in rural areas are given. In [11], a combination of the.

References.- 4 Hydrometeor Attenuation on Satellite Paths.- Classical Development for Rain Attenuation.- Attenuation and Rain Rate.- Slant Path and Elevation Angle Dependence.- Rain Attenuation Measurements.- Cloud and Fog Attenuation.- Cloud Attenuation Prediction Model.- Fog Attenuation on Earth-Space Paths The method for the prediction of rain attenuation in terrestrial links, given in Recommendation ITU-R P [1], was originally developed based on a simplified model for the temporal and spatial random variations of rain field causes the attenuation.

predictionmethod[16]. The climatic mapping of rain-rate and rain-attenuation has (GHz)andeffectiveradiusoftheEarth(km). The step by step procedure for calculating the attenuation distributionisgivenbelow: Step1: FreezingheightduringrainH r (km)iscalculatedfromthe. 1) At 10 to 45 GHz, there is sufficient relevant data to permit some extrapolation of theory and to determine esti­ mates of total attenuation and phase delay for earth/space systems.

2) At 45 to GHz,the situation is mixed. For clear-sky conditions the prediction procedures from 45 to GHz are so. 4) `ITU-R Recommendation: Propagation data and prediction methods required for the design of Earth–space telecommunication systems',p. 5) E. Matricciani. Prediction of site diversity performance in satellite communications systems affected by rain attenuation: extension of the two layer rain model.

Eur. by: Propagation Losses: GHz vs. 5 GHz 2 E Ó Magis Networks, Inc. perf Abstract The second type of tests are those performed Many recently published accounts that compare wireless local area network (WLAN) performance between GHz and 5 GHz systems make many claims regarding higher propagation losses at 5 GHz as compared to Size: 2MB.Abstract: Extremely low frequencies (ELFs) are employed to transmit data from underground to the ground surface in the measurement-while-drilling electromagnetic (MWD-EM) telemetry system.

Based on electromagnetic field theory, the present work is aimed at predicting the receivability of the signals at the surface. A unified analytic method that is suitable for vertical.