Global Positioning System Reference
In-Depth Information
Fade CDF
100.0
10.0
1.0
0.1
5
0
5
10
15
20
25
30
35
40
Fade (dB)
Figure 9.38
Fade CDFs for mobile (left line) and in-vehicle (right line).
Satellite signal strength CDFs
site A
1
I
II
III
IV
V
VI
VII
VIII
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
155
150
145
140
135
130
125
SV signal power (dBm)
Figure 9.39
Open-sky CDFs for the strongest eight satellites over 12 hours.
probability for the fourth satellite is stronger than about -132 dBm in this open-sky
condition. As expected, the signal power spread from the strongest to weakest is
only a few decibels.
By contrast, Figure 9.40 shows the same corresponding CDF curves for the
strongest eight satellites observed in-building. The environment is the second floor
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