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DORIS role in the next years

This theoretical exercise explores the anticipated evolution of DORIS in terms of user needs, technical aspects, and the external environment. It considers the current situation, extrapolates trends from the past years, and anticipates breakthroughs. The exercise focuses on the applications, programmatics, and technical aspects of DORIS, discussing the anticipated evolutions in precise orbit determination and precise positioning.

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DORIS role in the next years

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  1. DORIS role in the next years P. Escudier CNES

  2. Next years evolution • Prediction : • theoretical exercise • limited to tendencies • main parameters : • today situation • extrapolation of tendencies observed over the last years • anticipation of breakthrough • exercise to be conducted on : • user needs • DORIS technical aspects • external environment

  3. DORIS present situation : Applications • Unique Precise Orbit Determination technique • More than 10 years of operations • operationality, robustness • accuracy • only technique able to provide real time on board decimetric accuracy orbit • Important station positioning technique • first technique having provided Antarctica and Africa tectonic plate precise motion measurements • accurate vertical motion measurement • complementary from other techniques : cross calibration • uplink system : system provides transmission of measurements to distant users

  4. DORIS present situation : programmatics • DORIS on board SPOT 2, SPOT 4 and TOPEX/POSEIDON to be operated till end of each satellite lifetime • Jason 1, ENVISAT and SPOT 5 will be launched within the next 18 months Significant increase of the number of in flight receivers • DORIS Pilot Experiment to begin Frame for efficient interactions between the various DORIS partners : • data users • host agencies (stations) • project team

  5. DORIS present situation : technical aspects • On board equipment new generation • dual channel : ability to track simultaneously 2 beacons • phase measurement : • precise synchronization of dual channel measurements : relative positioning improvement • precise synchronization of 2GHZ & 400 MHz channels : ionospheric correction improvement • error budget improvement • Station network will be renewed with 3rd generation beacons : • shifted frequencies : • denser network • ability to have a more open management of the network : IDS group • new applications : precise time tagging

  6. Anticipated evolutions : POD applications • Precise Orbit Determination for altimetry missions : • long term commitment, decisions to be takenJason 2, post ENVISAT, ALTIKA, … • need for continuous performance improvements • accuracy, quasi real time products • new mission for ice altimetry : CRYOSAT (ESA) • Precise on board orbit determination : • exact need to be further analyzed considering DORIS performances : • radar interferometry, high resolution imagery • navigation system (GALILEO) • ... • Gravity missions : • DORIS will benefit from these missions but not presently included in there definition

  7. Anticipated evolutions : Precise Positionning applications • Terrestrial reference system definition will continue to require multiple technique for cross calibration • need for continuous performances improvement considering • other techniques evolution • accuracy demand • vertical motion measurement is a developing need : • in situ sea level monitoring complementary to satellite altimetry, • needs for measurements using the same reference • denser network will open new application

  8. Evolution : programmatics • Future decisions anticipated within the next years : • DORIS/CRYOSAT • Jason 2 • PLEIADES (SPOT follow on) • other programs still at very preliminary stage : • cooperation with NASDA • NPOESS • … to be discussedIDS may be a frame for new proposals to be submitted to the different Space Agencies

  9. Evolution : technical aspects1 instrumentation • Beyond already decided evolutions, R & T actions are going on : • mass, power reduction to make accommodation easier and increase the number of in flight receivers • on board processor change • performances improvements : ie USOs • instruments adapted to high altitude orbits (MEO) Considering the time to develop a new spacecraft, those changes will affect the users in the mid term and not in the short term • Important activity to be conducted in the next years • network survey for stations monument stability improvement

  10. Evolution : technical aspects2 Processing • Analysis of past years situation shows that the basis for system performances evolution is data processing improvement • T/P Orbit precision accuracy as improved from 10 to 2 cm within 8 years using the same instrument system • Further improvements still possible • modeling algorithms and estimation strategy tuning • taking advantages of technical evolution • measurement accuracy improvement • phase measurement • dual channel measurements • taking advantage of simultaneous multiple receivers • this is probably the major breakthrough • taking advantage of multiple technique combination • taking advantage of external improvements • gravity missions for more accurate and time varying earth gravity field

  11. DORIS EVOLUTIONMain tendancies (to be discussed) • DORIS role in POD and precise positioning should continue and develop in the next years • Strong need for continuous performance improvements • elements in place to support this effort : • increase of the number of in-flight receivers • new generation of stations and on board receivers • will basically rely on efforts made by data users • to benefit from the system evolution • number of receivers, instrumentations changes • to benefit from external improvements (ie gravity field missions) • to develop new strategies for improving POD or positioning accuracy IDS will play a key role to facilitate this process

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