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We used this observation ratio to determine whether the ratio has a seasonal variation.
If the signals are blocked by thick foliage, the observation ratio should be lower in the summer months than in the winter.
The observation ratio was computed for possible measurements above an elevation angle of 10°. Figure 7 depicts the ratio variations for about 2.5 years.
The observation ratio was found to have a clear seasonal variation, with a value of approximately 90% in the winter season, becoming smaller during the summer.
As expected, the observation ratio was higher in the winter season, when all of the leaves of deciduous trees have fallen.
In addition to the seasonal fluctuations, the observation ratio during the summer season continuously decreases over time, from approximately 86% in 2006 to approximately 84% in 2007, suggesting a relationship between decreases in the observation ratio and annual tree growth and the corresponding increase in signal blockage.
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To confirm that the thick foliage growing above the GPS antenna can actually block the GPS signals, we used observation ratios computed by TEQC.
We ran TEQC on RINEX files for the same data span as in Fig. 1 and computed the daily observation ratios.
Signal availability, computed as the ratio of the complete to possible set of observations, decreased with increasing tree growth and showed seasonal variation, with the observation ratios being higher during the winter months when the leaves had fallen.
Figure 7 Time series of satellite to ground-based observation ratios showing the long-term stability of total ozone for every single satellite datasets and the SNN merged data record.
Normalized peptide/protein observation ratios were calculated by dividing the number of peptides/proteins identified (not observation count) for a particular organism when using the neighbor genome sequence into the number of peptides/proteins identified when using its own genome sequence.
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