Thales Z-Max Operation And Application Manual page 164

You successfully continue to collect topo points for approximately 30 minutes
without loss-of-lock. You now are in the perimeter areas were there are trees
close to the edge of the landfill. While attempting to locate topo points right on
the edge of the trees, the kinematic alarm in the receiver sounds indicating
that you have lost your initialization. You must now re-initialize. It is good
practice to establish a re-initialization point near an area where you think you
may lose lock. This is done by simply driving a PK into the ground and
observing this point prior to entering into the obstructed area. If loss-of-lock
occurs, you can simply observe the re-initialization point for 10 seconds to
regain initialization. As an alternative, once you lose lock, you can move out
of the obstructed area and collect data on other points where there are no
obstructions for approximately 5 minutes, giving the system enough clean
data to re-initialize. Then move back into the obstructed area to collect more
points.
On-the-fly initialization is an effective method for initializing your kinematic survey
since there is no time wasted waiting for the system to initialize. But, you must be
careful that you collect clean data during the initialization period or you run the
risk of getting poor positions on some of your points.
2. Initialize by performing a static survey
Initialization of your kinematic survey can be accomplished by performing a static
survey. Refer to the static survey section (Step 11 on page 129) for guidelines on
static occupation times.
The following scenario is an example of where this type of initialization would
be used: You arrive on a new project site where you need to perform a
kinematic survey. There are no known points in the vicinity so you must
perform a static survey in order to initialize your kinematic survey. You set up
the base station on an existing point with known coordinates or an arbitrary
point where approximate coordinates will be assigned. You assign a point ID
of 0001 to your base point. You drive a PK nail into the ground, approximately
10 feet from the base point, to mark your initialization point. You assign a
point ID of 0100 to your initialization point. You set your rover system up over
this PK nail, enter the point ID, and observe this point for 5-10 minutes. This is
sufficient data to statically position this location. You are now initialized. You
can pick up your rover system and begin positioning other points.
Survey Preparation and Execution 141