| Inclined
Orbit Satellites:
The
idea behind the project was to combine terminals and monitors
of various sizes in order to provide dynamic content update via
satellite. Applications such as bus-shelters, commercial billboards
and similar public information boards will be the main beneficiaries.
These types of services can be easily serviced by cheaper transponders
on Ku-band end-of-life satellites and make this approach to broadcast
technology more competitive.
The
small size of the antenna limits the signal power received from
the desired satellite but also increases the relative amount of
interference received from undesired satellites. To overcome the
interference, the STELIOS team applied the technique of signal
spreading. The resulting signal to noise level handles a received
data rate of about 150kbps for one satellite transponder.
The
team has also developed a software suite to organise content,
generate a carousel, support file transfers and display the material.
Additionally, a control and monitor program to set-up the receiver
at installation and to monitor its performance has been included.
In
developing the ESA Telecom funded project, the team focused on
the Micro-terminals, and in particular the demodulator and modulators
which together with existing hardware provides the uplink station.
The receiver antenna and LNB is obtained by integrating off the
shelf equipment. In total eight demodulators and six modulators
were developed to use in demonstrations. |
