Thales Navigation gps receiver CGRS Manual

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Thales Navigation gps receiver CGRS
Surveying with ProMark2 37
Surveying with ProMark2
The observation plan shows that it will take 10 separate observation sessions to complete the
survey based on the network design in Figure 3.7. Notice that all observation sessions, except
for session 6, produce 2 vectors required from the network design. Observation 6 produces
only one since there were an odd number of required vectors (19).
This completes the discussion on how to execute the observation plan. The next question to
answer is when do we perform the observations. The best time to perform GPS surveys is
determined by an examination of the GPS satellite constellation at your location for a given
time of day. The number of visible GPS satellites and the distribution of the satellites in the
sky are important factors impacting the observation time required to produce quality GPS
vectors. Times when the number of visible GPS satellites is low or the satellite distribution is
poor will require extended data collection periods to ensure quality results. In rare instances,
availability and distribution may be so poor that you are better off not performing your survey
during these periods.
Included in the Ashtech Solutions processing software package is a module called Mission
Planning. The Mission Planning software provides you with the tools to examine the GPS
satellite constellation. Using satellite almanac information, which predicts the location of the
GPS satellites into the future, you can examine satellite availability and distribution for the
day(s) when you wish to perform your survey to isolate any time periods were observation
times may need to be extended or periods where it is best not to collect data. You provide the
software with your current location and the date when you wish to perform your survey. The
software then provides you with multiple ways of examining the satellite constellation at your
Figure 3.8 Receiver Observation Plan for 15-Point Control Survey
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