ashtech Z-FX, Руководство по эксплуатации и справочник

Страница: 83 / 94

Operations 71
O
p
erat
ion
s
system, often referred to as the base, remains centered over a known point while the
other system(s), often referred to as rovers, rove to unknown stations collecting short
5-10 minute data sets. In order to compute accurate baselines and establish accurate
positions on the unknown points, the data collected in the field is post-processed.
The disadvantage of this method is all points will have only one baseline establishing
them, like the kinematic method, since simultaneous data is being collected between
the base and one rover only. The use of two base stations would result in two baseline
measurements to each rover point, improving the reliability of this method.
System Setup
Perform the following steps to set up a receiver in the field. At least two receivers are
required to do a rapid static survey.
1. Set up Base over known point. Refer to “SYSTEM SETUP” on page 60.
2. For the Rover, 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.
3. Connect the antenna to the receiver with an antenna cable.
4. Measure the antenna height.
Enter antenna height into receiver via
SURVEY:STATIC
submenu (refer to
Figure 4.1).
This antenna height should be determined using the method described in “
MEASURING
ANTENNA HEIGHT”
on page 59.
a. From the main menu, press
↑
<2 seconds until
SURVEY:STATIC
is
selected.
b. With
SURVEY:STATIC
selected, press
↓
>2 seconds to enter the submenu.
c. Within the
SURVEY:STATIC
submenu, press
↑
< 2 seconds repeatedly
until
ANT HT
is selected.
d. Press
↓
<2 seconds to place receiver in edit mode.
e. Press
↑
or
↓
<2 seconds to scroll through possible numbers for antenna
height 1st digit.
f. Press
↑
+
↓
<2 seconds to accept the selected antenna height digit
(pressing
↑
+
↓
>2 seconds cancels the parameter setting).
g. Repeat steps e and f until all digits have been selected. The entered
antenna height will scroll by for visual confirmation.