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SA1: Production e-VLBI service Period 2 Overview Arpad Szomoru JIVE EXPReS is made possible through the support of the European Commission (DG-INFSO),

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Presentation on theme: "SA1: Production e-VLBI service Period 2 Overview Arpad Szomoru JIVE EXPReS is made possible through the support of the European Commission (DG-INFSO),"— Presentation transcript:

1 SA1: Production e-VLBI service Period 2 Overview Arpad Szomoru JIVE EXPReS is made possible through the support of the European Commission (DG-INFSO), Sixth Framework Programme, Contract #026642

2 2007 April 17EXPReS Annual Review: SA1Slide #2 SA1: the next 18 months All personnel in place, at JIVE and JBO Main focus: Adaptive scheduling Increasing the operational data rate Improving flexibility and robustness of correlation New telescopes Inclusion of eMERLIN telescopes Re-assessment/refinement of deliverables

3 2007 April 17EXPReS Annual Review: SA1Slide #3 Specific tasks Crucial: fast/adaptive (re-)scheduling Transform EVN into a truly flexible instrument Reaction time of hours Remote control of widely different telescope control systems Safeguard local operational constraints hard/software upgrade Phase out aging Station Units, main cause of operational instability Involves large software effort VSI compliance

4 2007 April 17EXPReS Annual Review: SA1Slide #4 Fine-tuning of deliverables Use of WSRT synthesis data for e-VLBI calibration (absolute flux calibration, polarization calibration, source selection) Space craft tracking correlator mode On-the-fly fringe fitting Real-time download and extraction of station information Automated correlator diagnostics Removing/adding stations from the correlation process on the fly Investigating a 1024M sub-array

5 2007 April 17EXPReS Annual Review: SA1Slide #5 Connectivity improvements: Use of new/modified transport protocols, lightpaths across Europe Increase granularity of data streams to optimize utilization of available bandwidth Increase of sensitivity and resolution through addition of telescopes: Effelsberg, Yebes, Shanghai Improving global connectivity: South-America, Puerto Rico, China, Australia

6 2007 April 17EXPReS Annual Review: SA1Slide #6 Global connectivity: Arecibo: 64 Mbps real-time operations in the past, currently < 32 Mbps. New submarine cable facilities in near future… Australia: 4 LBA telescopes connected at 1 Gbps. AARNET currently investigating transport to Europe. Issues with format conversion, command interfaces. First test planned before summer 2007

7 2007 April 17EXPReS Annual Review: SA1Slide #7 e-VLBI to South America: SMART-1 SMART-1 factsheet Testing solar-electric propulsion and other deep-space technologies Name SMART stands for Small Missions for Advanced Research in Technology. Description SMART-1 is the first of ESA’s Small Missions for Advanced Research in Technology. It travelled to the Moon using solar-electric propulsion and carrying a battery of miniaturised instruments. As well as testing new technology, SMART-1 is making the first comprehensive inventory of key chemical elements in the lunar surface. It is also investigating the theory that the Moon was formed following the violent collision of a smaller planet with Earth, four and a half thousand million years ago. Launched 27 September 2003 Status Arrived in lunar orbit, 15 November 2004. Conducting lunar orbit science operations. Notes SMART-1 is the first European spacecraft to travel to and orbit around the Moon. This is only the second time that ion propulsion has been used as a mission's primary propulsion system (the first was NASA's Deep Space 1 probe launched in October 1998). SMART-1 is looking for water (in the form of ice) on the Moon. To save precious xenon fuel, SMART-1 uses 'celestial mechanics', that is, techniques such as making use of 'lunar resonances' and fly- bys.

8 2007 April 17EXPReS Annual Review: SA1Slide #8 e-VLBI to South America (2)

9 2007 April 17EXPReS Annual Review: SA1Slide #9 e-VLBI to China 1 G1 G 2.5 G 155 M 100 M 1 G1 G 50 M 1 G1 G 34 M HKOEP 2.5 G ORIENT: 2.5 G TEIN2: 622 M 2.5 G SURFnet

10 2007 April 17EXPReS Annual Review: SA1Slide #10 e-VLBI to China (2) Lightpath Sheshan (near Shanghai) – JIVE in place (via HongKong, Chicago). RTT 360 ms. First tests (iperf with UDP, to rule out tuning issues): HongKong – JIVE: 577 Mbps Sheshan – Beijing: 560 Mbps (822 Mbps with TCP!) Beijing – HongKong: 1.85 Mbps Clearly some investigation needed

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