high-level ska signal processing description - The Square Kilometre ...

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WP2‐040.030.010‐TD‐001 Revision : 1 The interface to the Time Reference is applicable at both phase 1 and phase2 of the project 4.9 Science Computing The Science Computing provides data and meta‐data reduction to a format desired by the end user scientist from raw u‐v plane or non imaging data. The interface to the Science Computing is applicable at both phase 1 and phase2 of the project 4.10 Monitoring and Control Monitoring includes output from the telescope to the operator. This will provide information on the health status and the configuration of the telescope and is detailed in the Monitoring and Control Strategies and Philosophies document [20]. External operator control of the telescope is detailed in the Science Operations Plan [3] and the Monitoring and Control Strategies and Philosophies document [20] . The interface to the Science Computing is applicable at both phase 1 and phase2 of the project 4.11 Stakeholders Within the context of Signal Processing the Stakeholders are the external systems or humans that interact with Signal Processing equipment. The term ‘interact’ is used to indicate an associated change of state or the behavioural aspects of the system. The interactions of the Stakeholders are to be captured using Use Cases which are to be captured as part of the Requirements set. The Signal Processing Stakeholders include (but may not be limited to): • Scientists The Scientist defines and then submits a plan that details the high level usage of the telescope required for performing observations that support science experiments. • Operators The Operator is normally a Staff Astronomer or an Engineer that controls the SKA Telescope during science experiments or engineering experiments. • Maintainers The Maintainer is a technical person that is skilled and qualified prior to receiving SKA Telescope Technical Training and is responsible for Corrective and Preventive Maintenance and for the telescope. The Maintainer is also involved during telescope task execution. The maintainer monitors the system health displays regularly during task execution and could, when required, takes manual control of resources for the purposes of testing and diagnosis. (This authorisation needs to be delegated by the operator). 2011‐03‐29 Page 16 of 59
WP2‐040.030.010‐TD‐001 Revision : 1 • Engineer The Engineer is part of the multi‐disciplined SKA design team and is responsible for design commissioning, verification and incremental upgrade of the telescope. The interface to the Signal Processing stakeholders is applicable at both phase 1 and phase2 of the project. 5 Subsystem Having presented the Signal processing as a black box with a definition of its external interfaces in section 4, a definition of the Signal Processing internal functionality is now presented. bdd [block] system [Signal processing definitions] «block» Signal Processing 1..* 1..* 1..* 1..* «block» Correlator «block» Non-Imaging Computing «block» Beamforming «block» RFI Excision Figure 3 Signal Processing Definition Figure 3 provides a SysML graphical representation of the logical subsystem types that make up the Signal Processing element RFI Mitigation Correlator Beamforming Non‐Imaging Computing RFI Mitigation functionality is cross cutting across the whole of the SKA telescope with different strategies applied at different points in the system for different observation modes. It’s functionality within the Signal Processing cross‐cuts that of Correlation, Non‐Imaging and Beamforming. Section 6 provides an overview of the RFI Mitigation strategies applicable to the Signal Processing. 2011‐03‐29 Page 17 of 59
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