Chapter 1 Overview of the TimeSource 3100
Roof Antenna
20 TimeSource 3100 User’s Guide 097-72020-01 Revision K – December 2005
Roof Antenna
The antenna (Figure 1-2) is encased in weather-resistant plastic housing for outdoor
installation, usually on a roof. A single coaxial cable carries signals and power
between the antenna and the shelf.
Figure 1-2. The GPS Antenna
Functional Description
Overview
Figure 1-3 shows the main functions of the TimeSource 3100. The center of the
TimeSource 3100 is the Ensemble Timing Generator, which uses the BesTime
algorithm to analyze the phase and frequency relationships, individually and
collectively, of the timing sources. Each type of timing source has a particular
characteristic that gives it an advantage over other sources, as listed in Table 1-1.
The BesTime algorithm uses the best characteristic of each source to produce an
output signal with greater overall accuracy and stability than any single source. The
contribution of a source is based on its deviation from the weighted average of all
the sources. The more accurate a source, the more weight it has in the final output.
Every source is under constant evaluation and its contribution subject to periodic
adjustment. The output is essentially the best performance of the best source.
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