Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/institute/itsd/information/streaming/archive/IWPSS2006/MarceloOglietti102406Hi_supporting/MarceloOglietti102406.pdf Дата изменения: Tue Sep 25 16:26:37 2012 Дата индексирования: Wed Feb 6 05:04:47 2013 Кодировка: Поисковые слова: обвмадеойс нефептощи рпфплпч

Commentary on

Automated Allocation of ESA Ground Station Network Services
Damiani, Dreihahn, Noll, NiХzette and Calzolari

By E. Romero and H. E. Carranza
Presented by: Marcelo Oglietti


Planning Ground Stations Services
The ESA Ground Stations supports different types of missions.
Missions requiring frequent brief services (several per day). Missions requiring long infrequent services.

Different types of missions require services with different degrees of priority (and redundancy).
IWPSS 06 Oct 22-25 2006


Approach of the Paper
Ground stations services are thought as a whole unique service. The plan is iteratively refined. Interaction with the users in each step of the refinement process. Simplified view of the ground services: attending or not attending a mission. Emphasis is made in consistency check of plans (but little is said about plan generation). Modern techniques are used to check consistency of plans (especially for the checking of disjunctions of binary temporal constraint).
IWPSS 06 Oct 22-25 2006


Advantages
The unification of the planning process of the ground stations allows optimization. The planner does not have to provide a complete plan (this facilitates the planning process). Plans are enriched by user's expertise and knowledge.

IWPSS 06

Oct 22-25 2006


Possible Enhancements
Comparing different plans.
Preferences and priorities guide conflict resolution locally but, how is the quality of a whole plan measured? We need this to compare two possible plans.

Modeling more complex configurations.
Various configurations of ground equipment for every mission; The simultaneously sharing of ground stations resources by different missions; Different levels of redundancy in the provided services; A quantitative measure of "redundancy level" as reliability (MTBF).

Fixed tables of priorities and preferences.
The priorities and preferences are fixed. They should change dynamically according to mission operation importance (e.g. a S/C emergency).
IWPSS 06 Oct 22-25 2006