System Setup - ashtech Z-Surveyor Operation And Reference Manual

One of the primary error sources encountered when performing any type of GPS
survey is incorrectly measured or recorded antenna heights. Do not assume that an
incorrectly measured HI will affect only the vertical accuracy of the survey. This is
absolutely not true with GPS. To help minimize the effect of this error source, the
following procedure for measuring and recording the antenna height is recommended.
1.
2.
3.
If using a fixed length pole versus a tripod for set up of the GPS antenna, the antenna height needs
only to be determined once, utilizing the same value each time a survey is performed.

System Setup

Perform the following steps to set up a receiver in the field. At least two receivers are
required to do a static survey.
1.
2.
3.
60
Using the precision HI rod, place the pointed tip of the rod at the center of
the survey mark.
Lean the rod up against the GPS antenna. If the antenna you are using has
grooves to accept the HI rod, place the rod into the groove and read the
height on the side of the rod closest to the center of the antenna. If the
antenna does not have grooves to accept the HI rod, read the HI at the seam
between the top and bottom halves of the antenna housing. This is the slant
height of the antenna. The HI rod is graduated in two systems, feet and
meters. Read and record the height in both systems. This can be used as a
check to determine if the height was read correctly in case of a problem.
Repeat step 2 on the opposite side of the antenna. The two measurements
should compare to 1 mm. If they do not compare, either the antenna is not
level or one of the measurements is in error.
Record all antenna height measurements for each point observed in a field
log. Present this information to the person processing the data.
Set up and level an antenna over a survey mark using either a tripod and
tribrach combination, a bipod and pole system, or a fixed length GPS tripod.
The survey point must provide line-of-sight reception of the GPS signals.
Connect the antenna to the receiver with an antenna cable.
Enter SITE Identification.
Enter SITE into receiver via
From the main menu, press ↑ <2 seconds until
a.
selected.
b. With
SURVEY:STATIC
submenu.
c. Within the
SURVEY:STATIC
is selected.
SITE:****
submenu (refer to Figure 4.1).
SURVEY:STATIC
selected, press ↓ >2 seconds. to enter the
submenu, press ↑<2 seconds repeatedly until
Z-Surveyor & Z-FX Operation Manual
is
SURVEY:STATIC