(H-SAF) PROJECT PLAN - Version 2

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H-SAF Project Plan 2.0, October 2007 - Update PP-2.2, 10 April 2008 - Chapter 3 (The coordination task) Page 42 WP-1220: Dissemination links The purpose of WP-1220 is to ensure that the communication links between H-SAF product sources and EUMETSAT Members and cooperating States can support timely and reliable dissemination. Whereas WP-1210 addresses scientific users to collect H-SAF products off-line, that implies developing a new facility (the H-SAF archive), WP-1220 addresses end-users that need H-SAF products for operational use, within the required time limits, ranging from 10 to 20 min and 2 h, depending on the product (see Table 2). These figures, valid for the Operational Phase, assume 5 min delay introduced by the EUMETCast system (probably more during the Development Phase). Shorter delays require the use of dedicated lines. The work implies: • estimates of date volumes, data rates and time distribution profiles associated to the various H-SAF products; • review of the existing connections between the H-SAF production centres and the NMC’s of EUMETSAT member and cooperating States, and assessment of their suitability; • definition and implementation of possible actions needed for problems solving. For prototype products distribution use will be made of the ftp servers of the production centres. WP-1230: Reports collection and analysis The purpose of WP-1230 is to support the H-SAF performance monitoring function by collecting and analysing performance reports from the addressed users, on-line and off-line. Two types of utilisations are foreseen: on-line system monitoring and support to products cal/val. On-line monitoring has the objective to assess whether what was output from H-SAF has actually been received, at which time, and whether the content was sound, so as to check that the system is working properly. The work implies: • to establish the mechanisms for automatic reporting and the content of the report (time of reception, format check, some quick test on message soundness, …); • building the database of reports in a specific area of the central archive (see WP-1210). • compilation of statistics of delivery times, reception times, dissemination success rates for the various production centres, reception success rates for the various addressed users, compliance with format and message content specifications, etc.; • critical analysis of failures and classification into occasional and structural; • study, definition and implementation of problem solutions. Specific reports regard the results of validation campaigns. These will be analysed for: • supporting on-line quality control before product distribution (for the next deliveries); • retrofitting validation results into algorithm and software for improved calibration; • characterisation of the error structure of the products. The reports collection and analysis function will supported by the central archiving facility (see WP- 1210). For the initial activities (system build-up and preliminary validation campaigns) use will be made of the ftp servers of the participating Institutes. WP-1240: Web site and Help desk A project Web site will be implemented at the server of CNMCA. It will contain: • general public information on H-SAF • H-SAF products description • rolling information on the H-SAF implementation status • an area for collecting/updating information on the status of satellites and instruments used in H-SAF • an area to collect E&T material
H-SAF Project Plan 2.0, October 2007 - Update PP-2.2, 10 April 2008 - Chapter 3 (The coordination task) Page 43 • areas for “forums” (on algorithms, on validation campaigns, etc.) • indication of useful links (specifically with other SAF’s) • an area for “Frequently Asked Questions” (FAQ) to alleviate the load on the Help desk. The Help desk will complement the web site. First attempt will be to help by e-mail. If not sufficient, telephone contacts will be used. The Help desk will be managed by the Satellite Section of CNMCA, that could appeal to other Units of H-SAF if necessary. 3.4 The engineering task (WP-1300) The purpose of WP-1300 is to introduce and maintain industrial standard across the whole H-SAF architecture. It applies to the whole chain for products generation and dissemination. Although the nature of H-SAF is based on providing a service rather than a transportable SW/HW system (thus the essential requirements refers to product quality standards), compliance with a number of basic standard requirements is necessary for providing EUMETSAT with evidence of system reliability and stability. In fact, to demonstrate the feasibility, the quality and the usefulness of the products is only the first (indispensable) step for proposing an Operational Phase. The next requirement is that the system can become operational without having to re-design it to comply with operational standards. It also should be considered that, in the course of the possible Operational Phase, H-SAF will have to periodically be updated, for instance when NPOESS and the Global Precipitation Measurement mission (GPM) starts operations. If design standards are not established and observed, any update could imply requalification of some sub-system WP-1310: Detailed system architecture The purpose of WP-1310 is to add details to the conceptual H-SAF architecture outlined in the Development Proposal to the extent of identifying interfaces, defining system and sub-system requirements and ensure smooth flow of all operations. WP-1310 will start from the point where the Development Proposal arrived on the issue of architectural design and will develop the details until final consolidation of the system concept. The work will imply: • critical analysis of the preliminary concept outlined in the Development Proposal; • definition of system requirements, deployment of the details, identification of criticalities, definition of solutions, risk analysis; • definition of a baseline system architecture; • iterations on specific problems on the base of actual experience; • consolidation of system design. WP-1310 will be carried out in close cooperation with the Project Team. WP-1320: Engineering standards The purpose of WP-1320 is to establish engineering standards to be complied-with across the whole H- SAF system so that system credibility can be assessed and risks from changes are minimised. Since H-SAF delivers services (products), not SW/HW systems, the centres responsible of products generation are not bound to stringent requirements as regards standards and codes, except that the output products must comply with agreed coding, formats and protocols. Nonetheless, a minimum of standardisation is required to ensure that: • programming languages and software environments are used, that: - enable EUMETSAT to assess the credibility of the system to perform correctly and to comply with stability and reliability requirements; - enable smooth replacement of modules without need for re-qualifying system/subsystems; - enable smooth transition to a possible Operational Phase without need for substantial redevelopment, except possible addition of redundancies to strengthen reliability.
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