ST2276
Scientech Technologies Pvt. Ltd.
15
Experiment 3
Objective :
1.
Understanding the shape of Earth.
2.
Measurement of latitude, longitude.
Theory :
Earth Shape :
A significant problem when using the GPS system is that there are very many co-
ordinate systems worldwide. As a result, the position measured an calculated by the
GPS system does not always coincide with one's supposed position.
In order to understand how the GPS system functions, it is necessary to take a look at
the basics of the science that deals with the surveying and mapping of the Earth
surface, geodesy. Without this basic knowledge, it is difficult to understand why with
a good portable GPS receiver the right combination has to be selected from more than
100 different map reference systems. If an incorrect choice is made, a position can be
out by several hundred meters.
Different Earth Shapes like :
1.
Geoids
2.
Spheroid
3.
Worldwide reference ellipsoid WGS-84
Format of latitudes and longitudes :
Where a numeric latitude or longitude is given, the two digits immediately to the left
of the decimal point are whole minutes, to the right are decimals of minutes, and the
remaining digits to the left of the whole minutes are whole degrees.
Eg. 4533.35 is 45 degrees and 33.35 minutes. ".35" of a minute is exactly 21 seconds.
Eg. 16708.033 is 167 degrees and 8.033 minutes. “.033” of a minute is about 2
seconds.
Procedure :
Following steps has to be perform while doing the experiments.
Step 1 :
Please go through the manual before performing any practical.
Step 2 :
Install the software from the CD ie. Open WinZip from the CD and run the
setup file. If you don't have WinZip then please install WinZip from the CD itself.
Step 3 :
Connect mains cord to the trainer
ST2276
. Don't switch on the system now.
Step 4 :
Connect serial cable to the port which is available on the trainer. Connect
another end of the cable to PC serial port (COM1, COM2, COM3 etc.).
Step 5 :
Connect the patch antenna to SMA (subminiature) connector of the
ST2276
trainer.
Step 6 :
Place the antenna in the open space ie. Place the antenna outside the window.
HiK-Consulting