Trimble Outdoors 5700 - Manual (Page 97)

5700 GPS Receiver User Guide 8 1
Static and FastStatic Surveying 7
Appl
icatio
ns
7.2
Static Surveying
Static surveying is the most precise GPS surveying technique, but it
requires long occupation times at each station. Like all GPS surveys,
the Static survey requires the use of at least two receivers (one
receiver at each point defining the baseline), and each receiver must be
logging observations simultaneously from at least four common
satellites. Observations must be logged for an extended period of time
(usually about 45 to 60 minutes).
Although a large amount of data is collected during this period, this
allows the processing software to resolve more problems in the data
set than might otherwise be resolved in shorter observation periods.
The additional data typically leads to greater precision in the baseline
solution.
The information associated with a Static occupation is stored in a
separate, unique data file. There is only one occupation per file. If the
receiver is turned off in the middle of an occupation, a second file can
be opened and the survey can continue. In this case, there is more than
one file per occupation, but still only one occupation per file.
Static surveys can be performed with either single- or dual-frequency
receivers. The 5700 receiver is a dual-frequency receiver.
The occupation time required for a Static survey depends on many
factors. Trimble recommends an occupation time of at least 45
minutes when five or more satellites are available, or 60 minutes
during times when only four satellites are available. The Trimble
Geomatics Office software includes the QuickPlan™ utility, which
you can use to determine satellite availability at a specified site and
time.
Static surveying techniques are generally used for projects where the
highest precision is required. At least two receivers are required, but
multiple receivers can increase productivity. The sequence of
observations should be dictated by the network design.