Propagation Effects Handbook for Satellite Systems - DESCANSO ...

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Step 4 The specific attenuation coefficients are determined by interpolation from Table 6.3-3, with a polarizaiton tilt angle of 45° (circular polarization); Step 5 The Eq. (6.3-15 K= o.o163, a = 1.2175 attenuation exceeded for 0.01% of an average year, from ~ is; Ao.ol = (0.0163) (42)1.217S(7.53) (0.771 ) = 8.96 dB Step 6 The attenuation exceeded for other percentages is then determined from Eq. (3.6-16); % Attenuation (dB) 1.0 1.08 0.5 1.56 0.3 2.02 001 3(42 0.05 4.67 0.03 5.80 0.01 8.96 0.005 11.48 0.003 13.65 0.001 19.16 Figure 6.3-8 shows a plot of the resulting attenuation prediction distribution, compared with three years of measured distributions obtained with the CTS satellite (Ippolito 1979). The CCIR prediction is seen to over-predict slightly for higher percentage values, and to vastly under-predict for percentages below about 0.01%0 6-36
m I : STEP 1 SELECT CLIMATE ZONE FROM FIGURE 6.3-7 AND RAIN RATE ROW FROM TABLE 6.3-2 I STEP 2 + DETERMINE THE EFFECTIVE RAIN HEIGHT IN KM FROM THE LATITUDE O IN DEGREES ~ = 4.0 FOR050 ~ K = [~ + K v + (~ - KvkM? 0 cos 211/2 K#?H + K V U V + (~a” - KvUvlcas28 COS 2T T = POLARIZATION TILT ANGLE RELATIVE TO HORIZONTAL (t = 46° FOR CIRCULAR POLARIZATIONI STEP 5 CALCULATE ATfENUATION EXCEEDED FOR 0.01 % OF TIME AWN = L, rp KRa t I . STEP 6 + CALCULATE AITENUATION EXCEEDED FOR P% OF TIME Ap =0.12A ‘(0.546+ 0.043 log P) 0.01 p FOR O.W1 % for Cumulative Rain Rate and . Atte~uation Statistics Using the CCIR Model
Page 1 and 2: 1 6.1 INTRODUCTION 6.1.1 purpose CH
Page 3 and 4: ,s Table 6.1-1. Guide to Sample Cal
Page 5 and 6: I . . 6.1.4 Other Propagation Effec
Page 7 and 8: . . collisions at normal atmospheri
Page 9 and 10: D 1000 100 10 1 U.S. Standard Atmos
Page 11 and 12: Frequency (GHz) 10 15 20 30 40 80 1
Page 13 and 14: If PW is not available from local w
Page 15 and 16: . . The equivalent heights for oxyg
Page 17 and 18: m t TEMPERATURE rC) o 5 10 15 20 25
Page 19 and 20: 6.3 PREDICTION OF CUMULATIVE STATIS
Page 21 and 22: LSTATION LOCATION AND ELEVATION STE
Page 23 and 24: The models require the following in
Page 25 and 26: I z za E 100 g w ~ z z K 50 a) ALL
Page 27 and 28: B . . . t- I I I I I 1 11/1 - . . .
Page 29 and 30: .- . 9 s@EQ - If Z S D, compute the
Page 31 and 32: 1 0.02 0.05 0.2 0.5 4. Compute D: U
Page 33 and 34: I . ,. . ~ q 8 H v ~ 1.0 0.8 0.6 0.
Page 35: Step 6 Calculate the attenuation ex
Page 39 and 40: 9 10.OOOO 1.0000 0,1ooo 0.0100 0.00
Page 41 and 42: 1 6.3.3 Estimates of Attenuation Gi
Page 43 and 44: ● We now proceed exactly as in th
Page 45 and 46: STEP 1 GIVEN: STATION PARAMETERS SA
Page 47 and 48: . B . . . 4. Repeat the process for
Page 49 and 50: . . ● 100 10 1.0 .1 .01 . . RAIN
Page 51 and 52: not normally available~ but empiric
Page 53 and 54: ● The intensity-duration-frequenc
Page 55 and 56: - GIVEN: STATION PARAMETERS OPERATI
Page 57 and 58: m I s 70 2(J I 10 0 a) BY SEASONS
Page 59 and 60: .“ ● change in rain rater the r
Page 61 and 62: m To x o 6 x(n wux!- (5 zawwvxw x 1
Page 63 and 64: ● ✎ ✎ ✎ 10 1 0.1 0.01 0 . -
Page 65 and 66: ● ✎ ✎ ✎ appears to be gener
Page 67 and 68: 6.4.2.3 Statistics of Microwave Eff
Page 69 and 70: ● For each hour’s observations,
Page 71 and 72: Plots of noise temperature and atte
Page 73 and 74: .- I where Lf is the fog extent~ in
Page 75 and 76: than a minute and on spatial scales
Page 77 and 78: . . . 022 = angle-of-arrival varian
Page 79 and 80: B . . Figure 6.5-2 represents the a
Page 81 and 82: - . . , 1 I t , 3 , I 1 # 1 1 aJ 0a
Page 83 and 84: I . . -. % i ! ~ * 76.00 I h 60.00
Page 85 and 86: I where the constants are the same
Page 87 and 88:
.U . . \ Table 6.5-1. Fading Data P
Page 89 and 90:
o -5C \ A — . \ \ \ \ N- ● ●
Page 91 and 92:
I 1 \ 0,, FADE DEPTHS I 1 l.d 0.1 1
Page 93 and 94:
9 m ELEVATION ANGLE [DEGREESI ELEVA
Page 95 and 96:
Figure 6.5-12 is an example for thi
Page 97 and 98:
equal. The fade distributions resul
Page 99 and 100:
m . ANTENNA BEAMVVID~ (DEG) d o 0 w
Page 101 and 102:
. . 6.5.5.2.2 Spatial Diversity. Pa
Page 103 and 104:
fluctuation power at 1 Hz is on the
Page 105 and 106:
develops (Pruppacher and Pitter-197
Page 107 and 108:
.8 where: f = frequency, in GHz r =
Page 109 and 110:
B . k 11.7 26 \ QHz DATA, CTS A VPl
Page 111 and 112:
\ for the 11.7 GHz CTS beacon at 50
Page 113 and 114:
● these do not correlate well wit
Page 115 and 116:
. However the XPD dependence on ele
Page 117 and 118:
-. 50 40 30 20 10 0 . T(XPD < ABCIS
Page 119 and 120:
9 electrostatic fields discharge ra
Page 121 and 122:
, f w m I
Page 123 and 124:
. XPD 2 = XPD1 - 20 lo91~ f ~ 1 0.4
Page 125 and 126:
● 3.0 14 0.6 0.3 0,1 0.0s 0.03 0.
Page 127 and 128:
where, for example, for the frequen
Page 129 and 130:
L .- . ., not appear to be sufficie
Page 131 and 132:
D ‘1 may be considered to be rece
Page 133 and 134:
D - 0 m a 80 60 40 20 0 -20 \ — i
Page 135 and 136:
m I s 1 \\ I , t Frequency (GHz) Fi
Page 137 and 138:
-. Table 6.8-1. Cumulative Statisti
Page 139 and 140:
D - The propagation margin is then
Page 141 and 142:
1- * w -180 -190 -m -21 / ---+---4~
Page 143 and 144:
- . . 6.9 UPLINK NOISE IN SATELLITE
Page 145 and 146:
280 260 240 220 200 180 160 140 120
Page 147 and 148:
6.10 REFERENCES Ahmed, I.Y. and L.J
Page 149 and 150:
● International Telecommunication
Page 151 and 152:
Atmospheric Emission observations,
Page 153 and 154:
8.6 and 3.2 mm Radio Waves by Cloud
Page 155 and 156:
I Strickland, J.I. (1974), “Radar
Page 157:
D Wulfsberg, K.N. (1964), “Appare
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