1. No category

INCREASE IN THE EFFICIENCY OF THE CHANNEL IN
THE
COMMUNICATION
SYSTEM
OF
A
EARTH
OBSERVATION SATELLITE BY MEANS OF
THE
IMPLEMENTATION
OF
VARIABLE
CODING
AND
MODULATION – IAA-LA-17-P09
Marcos F. Pérez(1), Pablo D. Pareja Obregón(2), Maximiliano Erazú(3)
(1) Maestría en Tecnología Satelital MTS- UFS-CONAE, C entro Espacial
Teófilo Tabanera, Ruta C45 Km 8, Falda del Carmen (5187) Córdoba, Argentin
a, [email protected]
(2) Universidad Nacional del Sur, Alem 1253 (8000), Bahía Blanca,
Argentina, [email protected]
(3) Grupo de Comunicaciones Espaciales, Comision Nacion al de Actividades
Espaciales,Paseo Colón 751,Ciudad Autónoma de Buenos Aires, Argentin a,
[email protected]
Key words: Communications, Coding, Modulation, Satellites.
Abstract: The scientific instruments on board a Earth observation satellite
have been increasing their capacity in order to examine the planet in more
detail. The generated data are transferred to the ground stations by radio
frequency links, but the available bandwidth is limited. The low orbit
satellites must operate in a wide variation of the channel conditions. Often,
these conditions are significantly better than the worst case scenarios,
which are used to the choice of the transmission diagram.
The aim of this project is to demonstrate that the communication system of
the national developed spacecraft are available to be significantly improved
whether variable modulation and codification techniques are employed in
accordance with the lineaments created by the Consultative Committee for
Space Data Systems (CCSDS).
The employed methodology is firstly the identification of the transmission
diagram; needed units are identified and characterized in order to
implement the VCM; a structure to implement is established based on the
existing hardware; it is implemented; it is tasted based upon the “Test as
you Fly, Fly as you Test” thought.
This project presents the preliminary results obtained in a laboratory in
which the increase in the efficiency of the channel in the communication
system of an Earth observation satellite is clear.