Ashtech Z-FX Wartungshandbuch PDF herunterladen (Seite 85)

Operations 73

Operations

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.

f. Press

↑

↓

<2 seconds to accept the parameter setting (pressing

↑

↓

seconds cancels the parameter setting).

g. Within the

SURVCONF submenu, press

↑

< 2 seconds repeatedly until

EPOCH COUNTER is selected.

h. Press

↓

<2 seconds to place the receiver in edit mode.

i. Enter the correct value in the

EPOCH COUNTER submenu one digit at a

time and press

↑

↓

<2 seconds to accept the parameter setting.

RTK Surveying

Real-time differential positioning involves a reference (base) station receiver

computing the satellite range corrections and transmitting them to the remote stations.

The reference station transmits the corrections in real time to the remote receivers via

a telemetry link. Remote receivers apply the corrections to their measured ranges,

using the corrected ranges to compute their position.

RTK (Real-time kinematic) positioning can be used in lieu of real-time differential

positioning. RTK uses the carrier signal in addition to the code signal and is much

more accurate. Although messages transmitted and calculations performed vary, RTK

is essentially a special form of differential positioning. A base station receiver is

required to transmit RTK data to remote receivers. The remote receivers use the RTK

data to compute a corrected position.

As stand-alone, the Z-Surveyor and Z-FX can compute a position to around 15 meters

(100 m with Selective Availability - SA - Set in the satellite). Differential GPS

achieves sub-meter precision at a remote receiver, and RTK positioning achieves

centimeter accuracy at a remote receiver.

A communication link must exist between the base and remote receivers. The

communication link can be a radio link, telephone line, cellular phone,

communications satellite link, or any other medium that can transfer digital data.

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