Presto-HF is a matlab based toolbox dedicated to the identification problem
of low pass coupling parameters for band pass microwave filters. In this
problem one wants to recover the coupling parameters of the low pass
electrical equivalent circuit of a filter using squattering
measurements performed of the latter. This information is then typically
used for tuning purposes.
The techniques used in Presto-HF are 
based on analytical completion methods, matrix-valued
meromorphic and rational approximation as well as local optimization
over the lie group of orthogonal matrices (see  ). In particular
Presto-HF handles squattering data containing some delay components induced for example by the access devices. 
For the matrix-valued rational approximation stage Presto-HF relies
either on hyperion or RARL2, both develloped in our team.
As a toolbox, Presto-HF has a modular structure, which allows for
example to include some of its building bricks in an already existing
software.
The research effort that underlies this toolbox was partly (but constantly) 
supported by the french spatial agency (for short CNES). We want here to
thank the microwave team of the university of Limoges (IRCOM) as well as 
the filter department of Alcatel Space for their feedbacks as "real world"
users of our software that allowed us to improve the latter in a significant way.
For more information about Presto-HF please contact,
	Fabien Seyfert: fseyfert@sophia.inria.fr


In what follows we present some screen shots of a typical identification 
session performed on some squattering data provided by the french space agency
(CNES).