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TimeSource 3500
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Description
097-72050-01 Issue 7: August 2003
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ground. Wall/window installations also require the manual input
of location data, creating the potential for errors and the need to
detect these errors.
The TimeSource has unique algorithms to account for, and defeat,
the added multipath complications and location data entry error
possibilities of wall/window antenna installations. Large amounts
of multipath or major errors in location data entry are easier to
identify and are detected over a relatively short period of time.
These short-term errors are normally reported via the TimeSource
tracking success rate parameter.
Small amounts of multipath or minor errors in location data entry
are difficult to identify because they mimic a true signal or an
expected satellite behavior pattern. Single satellite reception over
limited periods of time complicates the ability for the internal
TimeSource algorithms to filter out these ghost signals and longer
periods of time are needed to sort them out. TFOM tracks and
reports these long-term errors.
At time of installation, marginal or unacceptable TFOM readings
can indicate the need to adjust the antenna placement, the mask
angle, and/or the location data. Relatively small changes in the
antenna placement can improve the ability of the system to see
satellites and therefore improve performance. The mask angle can
be adjusted to block out lower elevation portions of the sky if there
is good visibility at higher elevations, thereby reducing multipath.
Correct location data is very helpful in identifying and tracking
satellites.
In addition, a clock may be stable for many weeks, months, or
years but could degrade because of changes in its environment.
TFOM is useful in detecting these infrequent subtle changes
including:
• Maturing foliage or seasonal foliage changes
• Installation of new transmitters nearby (i.e. wireless base sta-
tion)
Содержание TimeSource 500
Страница 1: ...TimeSource 3500 GPS Primary Reference Source 097 72050 01 Issue 7 August 2003 ...
Страница 6: ...6 TimeSource 3500 Contents 097 72050 01 Issue 7 August 2003 ...
Страница 85: ...3 Chapter Installation This chapter is the sequential order of procedures for installation and power up ...
Страница 161: ...4 Chapter TL1 Reference This chapter provides information for using the TL1 language ...
Страница 271: ...6 Chapter Specifications This chapter provides equipment specifications ...
Страница 297: ...Index ...