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The Setup Menus
7.11
Set Auto Survey
The Model 1094B GPS receiver uses an Auto Survey Mode that determines its position relative to
the available Global Positioning Satellites. It has two operating modes that are selectable from the
front panel or through either of the serial ports. These modes are (1) Power On Survey, (2) Turn
Off Survey. See Figure 7.21.
Figure 7.21: Auto Survey Configurations
Once the survey has been started, the Model 1094B will indicate that it is locked to the GPS,
and continue to refine the surveyed position. The survey may also be turned off at any time by
selecting Turn Off Survey from the front panel.
The Auto Survey averages a total of 10,000 (slightly over 2 1/2 hours) valid 2D and 3D position
fixes. If the averaging process is interrupted, the averaging resumes where it left off when tracking
resumes. Once the position is surveyed, the M12M timing receiver automatically enters the Position-
Hold Mode. Once the antenna site has been surveyed in this manner, the user can expect a 2D
position error of less than 10 meters with 95% confidence, and a 3D error of less than 20 meters
with 95% confidence.