Thales Z-Max Operation And Application Manual page 152

application software. The recording interval for static surveys commonly
range from 5 to 30 seconds. Normally, it is not necessary to change the
elevation mask.
NOTE: If you want to change the recording interval, it is important to set the same recording interval
for all receivers used in the survey. GPS surveying depends on simultaneous data being collected
by all GPS receivers used. If one receiver is set to a recording interval of 20 seconds and the other
is set to 15 seconds, there will only be common data once every 60 seconds.
9. Enter the Site ID and HI
The Site ID and the antenna HI are important attributes of the point being
surveyed. Each point in the survey requires a unique point identifier so that /i1
processed vectors and least-squares adjustments can clearly be associated
with a specific point. This point identifier is the 4-character Site ID. If a specific
point is observed more than once during the project, the same Site ID must
be assigned to this point each time. And as previously discussed, the
accurate HI is critical for reducing the computed vector to the survey mark.
Both the Site ID and HI are required for each observation during data
processing. These parameters can be entered either in the SURVEY:Static
menu of the Z-Max front panel user interface or by using the handheld
computer running field application software. The Site ID and the antenna HI
should also be written down on the observation log. It is recommended to
have the manually written information as a cross-check.
10. Fill out the observation log (optional).
For each observation, an observation log sheet should be filled out,
containing the attribute information of the point being observed along with
additional information about the observation. The log sheet accompanies the
raw data for use during data post-processing. Critical information includes the
full point name and location, the Site ID, antenna HI, and any important
additional information about the point.
11.Verify operation
Perform the following visual checks to determine if the GPS system is
functioning properly:
a. Determine if the GPS receiver is tracking satellites by observing the SV/
Power LED on the Front Panel User Interface of the GPS Receiver
Module. It should blink green 5 or more times between each red power
blink.
b. Verify that data is being recorded by observing the Data Log LED on the
front panel of the receiver GPS Receiver Module. It should blink green
once at the frequency of the data recording interval (default is 20
seconds).
Survey Preparation and Execution 129