Date post: | 22-Dec-2015 |
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Finding a suitable location to set up the GPS base station
Fixed Height Tripod Setup(Mobile )
T – Bar Setup (Permanent)
The Do’s
• Location that is preferably central to the project
• Base Station as high as possible• Base Station receiver does not lose
power• Location that can easily be reproduced• Protected and Secure location
The Don’ts
• Radio transmission equipment• Trees• Tall Buildings• Ponds• Overhead power lines• Electrical generation facilities
Operation Modes
• Basic Features– designed to meet the needs of those site
users who require minimal functionality
• Basic+ Features– enables the site supervisor to establish the
base station, enter control point coordinates and then carry out a site calibration in addition to using all the features in the Basic Features operation mode
• Full Features– all the features available
Main Menu Structure
• SCS900 software Is– menu-driven system– ease of use and learning– access to six submenus
• Two main functions– Measurements– Stakeout
Work Orders menu
• Work Orders menu– New– Open– Change Design– Complete Work Order– Export/Import Data
Measurement menu
• Measurement menu– Check Surface Grade– Check Grade of Roadway– Check Material Thickness– Measure Surface– Measure Site Features– Display Real-Time Cut/Fill– Advanced Measurements
Stakeout menu
• Stakeout menu– Point– Line– Side Slope & Catch Point– Plane– Surface / Road– Enter/Edit Stakeout Points
Settings menu
• Settings menu– Units & Formats– GPS Settings– Internet & VRS Settings– Instrument Setup & Adjustment– Stakeout Settings– Data Output Options– COM Port Data Output Option– Radio Baud Rate
Volume & COGO menu
• Volume & COGO menu– Review & Edit Surface– Review Design Features– Compute Distance & Area– Create Stakeout Points– Create/Edit Road Data
System Setup menu
• System Setup menu (GPS)– Set up Base– Set up Rover– Calibrate Site– Recheck System Setup– Enter/Measure Control Points– Switch to Total Station Setup
System Setup menu
• System Setup menu (TS)– Connect Instrument– Set up Total Station– Instrument Functions Menu– Recheck System Setup– Enter/Measure Control Points– Switch to GPS System Setup
Positioning the GPS base station
• Located at a known or unknown point– Pick a point from the control point list– Set up on an unknown position– Enter its local coordinate– Enter its lat/long/height– Set up radio only
Starting the GPS base station
• AutoBase®– remembers how the previous setup was
made– reconnects the components– selects the appropriate radio channel– network number– starts to transmit GPS positions
Starting the GPS base station
• Before you start the base station, ensure that you do the following:– Connect the controller to the receiver, if
using a cable. Alternatively, you can make the connection using Bluetooth wireless technology from within the SCS900 software.
– Turn on the controller.– Start the SCS900 software.– Create a new work order on a new site if
not previously created.– Enter the control point coordinates for the
project .
Setup Base
• To set up the base station– System Setup– Setup Base– Select Connection
• Wireless• Cable
Connection Method
• Wireless– connect through Bluetooth wireless
technology
• Cable– connect through a cable
Wireless Connection
• Scan for available Bluetooth devices
The SCS900 software connects to that receiver and enables you to proceed with the base station setup:
Correction Method
• Transmitting RTK Corrections– Via radio in the receiver– Via Trimble/PacCrest radio using cable– Via Trimble Bluetooth radio– Via a third-party radio– Via a cell phone
Setup on unknown location
• Option only if site has not yet been calibrated
• Once a site has been calibrated:– Located at a known point– Control point in the calibration process– Established using the measure control point
function
Pick a point from the control point list
• Method is most likely to be used– moving the base station from one location
on site to a new location– site has been calibrated by a surveyor– known location is available only after you
enter control point coordinates
Enter its latitude, longitude, and height
• Another known point– point is a known point– local site coordinate is not known– has been lost
Base Antenna Height
• Antenna Height– computed elevation for the base station
position– where the antenna height is measured
Checking Channel/ Network
• Skip– no-one else is working within radio range– make sure that no interference– save time
Set Up Base Complete
• Base Station information– logged to the work order report file– hard copy record– re-established
Base Station Warnings
• GPS receiver is not receiving any satellite signals– Loose cable between the receiver and the
antenna– cable between the receiver and the
antenna is damaged– switched on after a long period of no use– GPS antenna is obstructed
Types of site calibrations
• Three types of calibration– A single-point calibration– A two-point calibration– A multi-point calibration
• If points are suspect– continues to warn you– surveyor for the project to check and
validate the control– check your equipment
• level bubble on your GPS rod• the rod• tip of the rod
Site Calibrations
• Includes datum transformation, map projection, horizontal & vertical adjustment
• Can select from library or DC file
This is the GPS calibration!
WGS84
Lat, Long,Height
Local
North, East,Elevation