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ESA And NASA Extend Ties With Major New Cross-Support Agreement

ESA and NASA managers sign expanded cooperation agreement in Washington, DC, 21 March 2007. L: Gaele Winters, head of ESA's Operations and Infrastructure Directorate. R: William H. Gerstenmaier, NASA Associate Administrator for Space Operations. Credits: ESA
by Staff Writers
Washington DC (SPX) Apr 05, 2007
On 21 March ESA and NASA signed an agreement in Washington, DC, extending the two agencies' long-standing cooperation in the areas of satellite tracking, spacecraft navigation and mission operations.

The agencies' new "Network and Operations Cross-support" agreement covers the ongoing provision to each other of services for missions where no specific Memorandum of Understanding (MOU) is in place, typically due to the short-term nature or limited scope of the support.

This type of support has been provided in the past, but was limited only to the sharing of ground tracking stations and had to be arranged for each mission separately through a Letter of Agreement (LoA), which was a long process.

Agreement covers tracking, navigation and systems sharing

The new agreement was signed in Washington, DC, by William H. Gerstenmaier, NASA Associate Administrator for Space Operations, and Gaele Winters, ESA Director for Operations and Infrastructure.

The agreement constitutes a major milestone in the long-standing cooperative relations between ESA and NASA, and covers cross-support in the following areas:

- Bi-directional Telemetry, Tracking and Command (TT and C) services

- Space Navigation, including services such as determining spacecraft trajectories and Very Long Baseline Interferometer (VLBI) services

- Mission Operations and Ground Data Systems services

"The agreement means ESA and NASA can provide each other network support and space operations services more quickly, and this is becoming very significant. The sharing of resources is a sensible and efficient way to achieve enhanced space science value in an era of tight budgets," said Dr Manfred Warhaut, Head of ESA's Mission Operations Department.

Enhanced effectiveness, reduced risk for both agencies

In particular, the bi-directional sharing of TT and C services will enhance effectiveness and reduce risk for both agencies.

This interoperability will benefit both by providing immediate back-up in case a mission's prime ground station is not available due, for example, to local weather interference or earthquakes, by ensuring additional station support during critical mission phases such as launch, orbit entry or manoeuvres, and by expanding station resources when ground tracking coverage might otherwise be missed.

Very Long Baseline Interferometry refers to accurately locating spacecraft using highly sophisticated signal processing techniques and is achieved using Delta DOR (Delta Differential One-Way Ranging) technology, used by both NASA and ESA. Since 2005, ESA has installed Delta DOR receivers at both of the Agency's 35-metre antenna deep-space stations, DS1 in New Norcia, Australia, and DS2 in Cebreros, Spain.

The first application of the new agreement is foreseen during the critical Launch and Early Orbit Phase (LEOP) for NASA's upcoming Dawn and Phoenix missions. ESA will furnish support via the Agency's Perth and Kourou 15-metre antenna stations.

ESA's tracking stations network - ESTRACK - is a worldwide system of ground stations providing links between satellites in orbit and the Agency's Space Operations Centre (ESOC), in Darmstadt, Germany. The core ESTRACK network comprises 11 terminals sited at eight stations in five countries.

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