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7 Carrier Phase Data Collection
C
Feature B was unwisely recorded during a period when no useful data
was recorded. You probably need to record this feature again.
Feature C was started when the counter started for Block 2. Logging to
this feature continued after the success beep. Then there was a loss of
lock and a new block of carrier phase data started. The feature was
ended before the success beep sounded for this block of data, and the
file was closed. In this case, the portion of the feature collected up
until the loss of lock, indicated by the end of Block 2 in Figure 7.3,
should achieve the desired precision. However, the second portion of
the data, associated with Block 3, may not achieve the desired
precision.
Warning – Only move to the next feature before the minimum time is up if
loss of lock is unlikely.
As you record features, be aware of the following:
the number of satellites available
the position of these satellites—if they are to stay visible, they
should be high rather than low on the horizon
any obstruction likely to cut off your view of the satellites as
you move
Read any messages that appear on the screen. They indicate how
useful the current data is.
The review screen also shows if loss of lock has occurred so you can
measure that feature again if necessary. If it is clear that a block
contains insufficient data, you can collect any features that are affected
before leaving the site.
You may sometimes decide that enough time has elapsed to provide a
useful measurement, even though the specified time has not been met.
This depends on the precision required.
170 TSC1 Asset Surveyor Operation Manual