
20
Promark2 User’s Guide
Time in the Field
Stop-and-go
Since the stop-and-go method requires an initialization, the occupation times are much shorter
than the static method. Initialization on a known point can be accomplished in as little as 15
seconds with a 1 second recording interval. Initialization with the initializer bar is typically 5
minutes. Stop-and-go point occupations can be accomplished in as little as 15 seconds with a 1
second recording interval. These occupation times may vary depending upon factors 1, 2, and
3 above.
Kinematic
The kinematic method also requires an initialization as detailed in the stop-and-go method.
Kinematic data collection does not use an occupation timer since kinematic data is collected
while moving. The recording interval must be set to a value that properly matches the speed
you are moving. A recording interval set too slow may result in data that does not represent
the feature being surveyed. A recording interval set too fast may result in data too dense for a
particular application. The base and kinematic units must be set to the same recording interval
for successful kinematic survey.
In general, the amount of time required to occupy a point depends on several factors:
1.
Distance between survey points
. In general, the greater this distance, the longer the
observation time.
2.
Environmental conditions
, or the amount of obstruction or canopy preventing a
completely open sky view. Some obstructions may block the reception of the satellite
signal, requiring longer observation times to collect additional data for accurate
processing. Too much obstruction prevents ProMark2 (or any GPS receiver) from
receiving enough data to establish quality survey positions.
3.
Satellite Geometry
: This refers to the position of the satellites that are orbiting the
earth. If the satellites are positioned poorly (i.e. all on one side of the sky), it is more
difficult to get an accurate position. The Mission Planning Tool in Ashtech Solutions
assists in planning survey times with optimal geometry.
You will find that static observation times will vary between 20 and 60 minutes depending
upon factors 1, 2, and 3 above. The Observation Timer feature of ProMark2 is designed to
assist in determining observation times. The Observation Timer takes into consideration the
number of satellites and satellite geometry, and determines when enough data has been
collected for a given distance between points. For more information on the observation timer,
please refer to page 55.
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