| Title: |
Taking Saratoga from space-based ground sensors to ground-based space sensors |
| Venue: |
EN413, Level 4, EN Building |
| Abstract: |
The Saratoga transfer protocol was developed by Surrey Satellite Technology Ltd (SSTL) for its Disaster Monitoring Constellation (DMC) satellites. In more than seven years of operation, Saratoga has provided efficient delivery of remote-sensing Earth observation imagery, over private wireless links using the Internet Protocol (IP), from these seven low-orbit satellites to ground stations. Saratoga has also delivered data for the first in-space tests of the 'Interplanetary Internet' from the UK-DMC satellite [1]. The Saratoga protocol design has been specified and further enhanced in the Internet Engineering Task Force [2]. Saratoga is designed to cope with high bandwidth-delay products, constrained returned channels, and high loss while streaming or delivering extremely large files. An implementation of this protocol has been developed at the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) for wider public use and testing. This implementation is intended to prototype delivery of data across dedicated astronomy radio telescope networks on the ground, where networked sensors in Very Long Baseline Interferometer (VLBI) instruments generate large amounts of data for processing and can send that data across private IP- and Ethernet-based links at very high rates [3]. We describe this new Saratoga implementation, its features and focus on high throughput and link utilization, and lessons learned in developing and testing this protocol for sensor-network applications.
[1] Will Ivancic, Wesley M. Eddy, Dave Stewart, Lloyd Wood, James Northam and Chris Jackson, Experience with delay-tolerant networking from orbit, accepted by and to appear in the International Journal of Satellite Communications and Networking, special issue for best papers of ASMS 2008, in press.
[2] Lloyd Wood, Jim McKim, Wesley M. Eddy, Will Ivancic and Chris Jackson, Saratoga: A Scalable File Transfer Protocol, work in progress as an internet-draft, draft-wood-tsvwg-saratoga-05, May 2010.
[3] Charles Smith, SKA Monitor and Control: A discussion paper on possible approaches for Monitor and Control of the Square Kilometer Array building on lessons learned from ASTRON & NRAO in the implementation & operations of LOFAR, eVLA & ALMA, v1.2, March 2010. |
| Biography: |
Charles Smith is a networking consulting engineer currently attached to the CSIRO Astronomy and Space Science Division. He is advising the Australian Telescope National Facility and the Square Kilometer Array Project Development Offices on networking technologies and researching architectures for the data and control planes for the ASKAP and SKA radio telescopes.
Previously Charles spent 8 years at Cisco Systems, where he was a principal architect and engineered research and education networks including the National Lambda Rail in the United States and TWAREN backbones in Taiwan.
On leaving CISCO Charles spent a year with Alcatel-Lucent where he authored am encryption methodology for securing MPLS transmissions, which is currently proceeding through patent evaluation.
He is co-author of the Saratoga protocol which is in draft status with the IETF and author of the reference 'C' implementation Code. |
