ashtech Z-FX, Operation And Reference Manual

Page: 77 / 94

Operations 65
O
p
erat
ion
s
At this stage, a known baseline exists, from which the kinematic survey can be
initialized. This section will step you through the process of initialization and
execution of the kinematic survey.
1. Set up the base unit on the base point. This GPS system will not move
throughout the survey. The operator of the base system will follow the same
procedures for a static survey with one exceptions. The description of this
exception follows:
a. It is recommended for a kinematic survey to log data at a 5-second
recording interval. The factory default recording interval is 20 seconds.
Refer to “PERFORMING A STATIC SURVEY” on page 59 for
details on system setup, measuring antenna height, entering site-specific
information, changing receiver parameters, and monitoring the survey.
The remaining steps below refer only to the rover system. No further action is
required at the base system.
2. Set up a rover on the initialization point. The initialization point is always
the first point observed in a kinematic survey. This could be a known point
in relation to the base, an arbitrary point name near the base, or the first new
point to be established. Follow the setup procedures outlined in
“PERFORMING A STATIC SURVEY” on page 59.
3. It is critical throughout a kinematic survey to maintain lock on at least four
satellites at all times. If loss of lock occurs, the kinematic survey must be
reinitialized on a known point, otherwise all the data collected after the loss
of lock will be useless. Therefore, it is imperative that the user be warned if
loss of lock occurs.
The MIN SVs parameter allows you to define the threshold of the minimum
number of satellites locked. If fewer satellites are locked, the alarm will
sound. The factory default for this parameter is zero. You may wish to
increase this to five and perform mission planning as precautionary
measures.
Enter minimum SV into receiver via
SURVCONF
submenu (refer to Figure
4.1).
a. From the main menu press
↑
< 2 seconds until
SURVCONF
is selected.
b. With
SURVCONF
selected, press
↓
>2 seconds to enter the submenu.
c. Within the
SURVCONF
submenu, press
↑
< 2 seconds repeatedly until
MODE
is selected.
d. If
KINEMATIC
is not displayed, press
↓
<2 seconds to place the receiver
in edit mode.
e. Press
↑
< 2 seconds repeatedly until
KINEMATIC
is selected.