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We present the results of a large scale simulation, reproducing the
behavior of a data center for the build-up and maintenance of a
complete catalog of space debris in the upper part of the low Earth
orbits region (LEO). The purpose is to determine the performances of
a network of advanced optical sensors, through the use of the newest
correlation and orbit determination algorithms. This network is
foreseen for implementation in a Space Situational Awareness system,
such as the future European one. The conclusion is that it is
possible to use a network of optical sensors to build up a catalog
containing more than 98\% of the objects with perigee height between
1100 and 2000 km, which would be observable by a reference radar
system selected as comparison. It is also possible to maintain such
a catalog within the accuracy requirements motivated by collision
avoidance, and to detect catastrophic fragmentation events. The
obtained results depend upon specific assumptions on the sensor and
on the software technologie
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