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A Generic Archive Protocol and an Implementation
Abstract
Archiving vast amounts of data has become a major part of every
scientific space mission today. GRASP, the Generic Retrieval/Ar\-chive
Services Protocol, addresses the question of how to archive the data
collected in an environment where the underlying hardware archives and
computer hosts may be rapidly changing.
The Compton Observatory Science Support Center (COSSC) is developing a
coherent analysis environment for the analysis of Compton and other
gamma-ray astronomy data. This environment, GammaCore, allows the
astronomer to access the data analysis systems developed at the
instrument team sites for the four Compton Observatory instruments. In
addition users have access to standard astronomical tools, an archive
system and other software developed at the COSSC. This paper describes
the development of the GammaCore, particularly its user interface which
is based on the AGCL, an early version of the AXAF Science Center's
ASSIST system. The discussion focuses on the problems that were
encountered in integrating extremely diverse software packages, and how
these problems were overcome. Information on how to get access to the
GammaCore is also given.
An efficient method for the reconstruction of bandlimited images
and the approximation of arbitrary images from nonuniform sampling
values is developed. The novel method is based on the observation that
the reconstruction problem can be formulated as linear system of
equations using two-dimensional (2-D) trigonometric polynomials, where
the matrix is of block-Toeplitz type with Toeplitz blocks. This system
is solved iteratively by the conjugate gradient (CG) method. We show
that the use of so-called adaptive weights in the establishment of the
block Toeplitz matrix can be seen as efficient preconditioning. The
superiority of the new method over conventional approaches is
demonstrated by numerical experiments
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