Handbook of Propagation Effects for Vehicular and ... - Courses

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8-26 Correlation Coefficient 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Propagation Effects for Vehicular and Personal Mobile Satellite Systems 0.0 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 Frequency (MHz) Figure 8-16: Spatial autocorrelation versus frequency at a lag of 50 cm for EERL. Correlation Coefficient 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance Lag (5 cm Increments) COMMONS EERL FARMHOUSE Figure 8-17: The spatial autocorrelation at 1625 MHz versus distance lag in Commons, EERL, and Farmhouse. The abscissa distance is the indicated number times 0.05 m.
Earth-Satellite Propagation Effects Inside Buildings 8-27 Table 8-15: Median decorrelation distances at each building location. Building Median Decorrelation Distance (m) Commons 1.1 EERL 0.5 Farmhouse 0.85 House 0.55 MER 0.7 Motel 0.55 Overall Average 0.71 8.4.5 Relative Signal Loss Versus Frequency An example of the trend of the relative signal loss versus frequency over the interval 500 MHz to 3000 MHz at a fixed location in the Farmhouse is given in Figure 8-18. The trend slope of -0.006 dB/MHz is shown to exist over the frequency interval between 500 MHz and 3000 MHz. The trend slope should not be confused with the smaller scale frequency slope FS given by (8-6) which characterizes the change of signal level per MHz of bandwidth. The indicated trend slope in Figure 8-18 implies that over the frequency interval of 2500 MHz (500 MHz to 3000 MHz) the attenuation trend is such that the signal level is diminished by approximately 15 dB. An overall summary of the trend slope statistics is given in Figure 8-19 where all positions within each building are considered. We note that the Farmhouse represents an extreme case for the trend loss as all the other sites have significantly smaller values. Signal Level (dB) -5 -10 -15 -20 -25 -30 -35 -40 y = -11.51 - 0.006*x -45 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 Frequency (MHz) Figure 8-18: Dependence of relative signal level with frequency in the Farmhouse. The trend slope is shown to be -0.006 dB per MHz.
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A2A-98-U-0-021 (APL) EERL-98-12A (E
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Table of Contents 1 Introduction __
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10 Optical Methods for Assessing Fa
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Table of Contents 1 Introduction __
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1-2 Propagation Effects for Vehicul
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Table of Contents 2 Attenuation Due
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Chapter 2 Attenuation Due to Trees:
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Attenuation Due to Trees: Static Ca
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Table of Contents 3 Attenuation Due
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Figure 3-23: Fade distributions at
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3-4 Relative Signal Level (dB) 5 0
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3-10 Percent of Distance the Fade >
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3-12 Propagation Effects for Vehicu
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3-14 3.4.3 Austin, Texas at K-Band
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3-20 Relative Signal Level (dB) 5 0
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3-24 Percentage of Distance Fade >
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3-26 and where 1 2 Propagation Effe
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3-28 Percentage of the Time Fade >
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3-32 3.7.5 Comparative Summary of M
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Chapter 4 Signal Degradation for Li
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Table of Tables Table 4-1: Summary
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4-4 Percentage of Distance Fade > A
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4-14 Percentage of Distance or Time
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Table of Contents 5 Fade and Non-Fa
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Chapter 5 Fade and Non-Fade Duratio
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Fade and Non-Fade Durations and Pha
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Table of Contents 6 Polarization, A
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Chapter 6 Polarization, Antenna Gai
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Polarization, Antenna Gain and Dive
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Table of Contents 7 Investigations
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was derived from measurements over
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7-6 7.3 Belgium (PROSAT Experiment)
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7-10 Probability Fade > Abscissa (%
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Optical Methods for Assessing Fade
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Table of Contents 11 Theoretical Mo
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Chapter 11 Theoretical Modeling Con
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Theoretical Modeling Considerations
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Table of Contents 12 Summary of Rec
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Table 12-7: Tabulation of azimuth a
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12-10 12.6.5 Satellite Diversity Pr
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12-14 Standard Deviation (dB) 4 3 2
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12-18 Fade Depth (dB) 7.0 6.5 6.0 5
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Index 13-1 Index 2 2-state Markov m
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Index 13-3 Jongejans, A. et al., 3-
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