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6. Effect of faults
Unlike a mechanical antenna, which is internally inert, an active antenna contains a large number of active circuits that are liable to fail.
A binary-controlled phase shift, delay or amplitude control cell is statistically, during antenna operation, 50% in each of the 0 or 1 states. A failure on such a cell leading to the permanence of a state 0 or 1 whatever the command can therefore be described as a zero error for 50% of the values to be obtained and an error equal to the p e value of the step in failure for the other 50% of the values.
A complete failure on an amplification chain can be described as an a n error equal to – a n .
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Effect of faults
Bibliography
Articles on antennas and active modules
Organizations
European Space Agency (ESA) http://www.esa.int
Centre National d'Études Spatiales (CNES) http://www.cnes.fr
ONERA http://www.onera.fr
TNO-FEL (Pays-Bas) (Physics...
Suppliers
(non-exhaustive list)
Companies developing technical solutions for active antennas for radar and space communications:
GTDAR (GIEE tri-national GB/F/All)
Thales http://www.thalesgroup.com
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