GALA - Galileo overall Architecture Definition
Overview
Background & policy context:
The Galileo system is the European-led global navigation satellite system. The system will provide position determination, navigation, timing, and communication services world-wide, to global user communities.
The Galileo system will provide different levels of services for professional users, mass market, and safety of life applications. The set of services, clearly defined by their performance and availability will be provided on a global, regional, or local level.
Objectives:
- To provide the mission and system requirements, taking inputs from the application task (task1), GEMINUS study and from past studies (ESA Comparative System Study), and including a focus on navigation, communication and Search And Rescue (derived from SARGAL study outputs) requirements as well as revenue generation, international, legal and standardisation issues. It must be noted that additional requirements are derived from tasks 6 and 13 for safety and security respectively. To perform technical trade-offs related to GALILEO navigation function and the potential communication function, as key inputs for architecture tasks.
- The navigation signals are considered in a specific trade-off analysis, including the signal structure and the cryptology associated with access control.
- The deployment strategy, the support to operations and the Integrated Logistic Support (ILS) concepts are analysed and requirements are derived.
- A technical baseline document is produced in order to provide an updated issue of open trade-off and scenarios to be analysed by architecture and component design activities.
Methodology:
Due consideration shall be granted to Assembly, Integration and Validation (AIV) aspects, Qualification needs, Deployment and operations of the system, certification plan and Integrated Logistic Support (ILS). These aspects have very significant impacts on systém development plan and cost assessment. In that sense, the separation of the global component into a “classical” space segment and an “advanced” mission segment is very important.
Indeed, the space segment will allow to provide “core services” (navigation functions without integrity and without encryption features, for example) with a limitation of risks, and will be qualified first. The mission segment will allow to provide the “full services” and will be qualified later, making use of the space segment.
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