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V-6
GPS Marine An
tenna
SCOUT Telecomunicazioni
| Via Toscanini 148, 41019 Soliera, Italy
tel. +39 059 566650 | fax +39 059 565949 | e-mail: [email protected]
Technical specifications here included may change without prior notice.
SCOUT
is a registered trademark.
Reg. n. 009799602
www.scoutantenne.com
4
Professional Marine Antennas Made In Italy
Basic concept of GPS
A GPS receiver calculates its position by precisely timing the signals sent by GPS satellites high above the Earth. Each
satellite continually transmits messages that include
•
the time the message was transmitted.
•
satellite position at time of message transmission.
The receiver uses the messages it receives to determine the transit time of each message and computes the distance
to each satellite using the speed of light. Each of these distances and satellites’ locations define a sphere. The
receiver is on the surface of each of these spheres when the distances and the satellites’ locations are correct. These
distances and satellites’ locations are used to compute the location of the receiver using the navigation equations.
This location is then displayed, perhaps with a moving map display or latitude and longitude; elevation or altitude
information may be included. Many GPS units show derived information such as direction and speed, calculated
from position changes.
A good external GPS Antenna is the foundation of a good GPS Navigation system
. The reasons to need an external
GPS antenna:
•
For use in a vehicle where the GPS receiver cannot or will not be placed near a window.
•
For use in any place that the receiver doesn’t have a good view of the sky.
•
To minimize temporary loss of signal when in a vehicle in motion.
•
To maintain the best possible accuracy by having a lock on the greatest number of satellites.
A GPS antenna is a device that helps boost the reception signal to a GPS unit, whether it is a standalone unit or an
embedded unit. Often a GPS antenna is used in a situation where the GPS unit itself is somehow removed from a line
of sight to the sky, as in a car or a yacht, to help the GPS “see” the sky without having to be moved.
Most GPS Devices will came with an internal Antenna with limited sensitivity. Also some the internal Antenna & the
GPS Receiver Module will interfere each other and lower the Position Accuracy.
