Page 210 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes transmission and should provide a base of technical knowledge that will stimulate use for
a variety of transportation-related data transmission throughout remote areas of the world.
Questions:
1. Critically analyse the above case.
2. Discuss the major drawback in Nevada which arise from the lack of a communication
System.
Source: http://onlinepubs.trb.org/onlinepubs/trnews/rpo/rpo.trn171.pdf

12.3 Summary

Satellite communications play a vital role in the global telecommunications system.
A satellite is basically a self-contained communications system with the ability to receive
signals from Earth and to retransmit those signals back with the use of a transponder—an
integrated receiver and transmitter ofradio signals.
The first major geosynchronous satellite project was the Defense Department’s ADVENT
communications satellite.
Advances in satellite technology have given rise to a healthy satellite services sector that provides
various services to broadcasters, Internet service providers(ISPs), governments, the military, and
other sectors.
Telecommunications systems developed to use meteor trails transmit data in bursts as intermittent
meteor trails arrive for use; however, not all meteors create trails usable for communications.
A meteor burst communications system (MBCS) uses ionized meteor trails as a means of radio
signal propagation.

The network supports a variety of data communication services for road transport and telemetry
applications.
Meteors enter the earth’s atmosphere at speeds between 10 and 80 Kilometres per second and
burn up due to friction at altitudes between 80 and 120km, dependent on their size, speed and
angle of entry.

Meteor scatter activity can use either annual meteor showers or random meteors.
12.4 Keywords

Broadcasting: Broadcasting, electronic transmission of radio and television signals that are
intended for general public reception, as distinguished from private signals that are directed to
specific receivers.
Satellite: An artificial body placed in orbit around the earth or another planet in order to collect
information or for communication.

Meteor Scatter: Meteor scatter communications, is a radio propagation mode that exploits
the ionizedtrails of meteors during atmospheric entry to establish brief communications paths
between radio stations up to 2,250 kilometres (1,400 mi) apart.
Meteor Burst Communication: Meteor burst communication is a way of communicating using
the ionized trails made by meteors as they enter the earth’s atmosphere. It is also called Meteor
scatter communication.
Geostationary Orbit: GEO satellites are synchronous with respect to earth and are placed in the
space in such a way that only three satellites are sufficient to provide connection throughout the
surface of the Earth (that is; their footprint is covering almost 1/3rd of the Earth).

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