document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T102-41ET Altimetric Measurements of 2D Ocean Surface Currents Understanding of ocean circulation and currents is of special importance to oceanographers and climatologists. Conventional altimeters provide highly accurate measurements at the sub-satellite point, but this coverage is insufficient for faster changing currents, eddies and, in particular, coastal areas, which also suffer from land contamination in the signal. Along track SAR interferometry (ATI) is one way in which surface currents can be derived and dedicated systems to do this have been proposed in the past. ATI though only provides one ocean surface current vector - orthogonal to the direction of flight. This approach is extended in ESA patent 511, which describes a technique for deriving 2D ocean surface currents using two antennas producing four squinted beams each. While the basics for the technique are outlined in the patent, a further system study should be performed in order to optimise all the system parameters, perform modelling and determine performance parameters for frequencies from X- to Ka-band as well as the potential of formation flying two satellites in order to realise the desired along and accross track baselines. Deliverables: Basic system design (or designs) of the instrument for measurement of 2D Ocean Surface Currents. Current TRL: TRL1 Target TRL: TRL3 Application Need/Date: TRL5 by 2015 Application/Mission: Future ocean missions Contract Duration: 12 months SW Clause : - Dossier0 Ref.: T-8153 Consistency with Harmonisation Roadmap and Conclusions: Not directly linked to harmonised technology. TRP Reference: T102-43ET Title: Integrated Receiver and ADC for Active Array SAR Next generation spaceborne SAR will utilise digital beam forming techniques to improve performance and flexibility. For this application early down conversion and medium number of bit digitalisation on subarray level would be needed. Power consumption is crucial while high bandwidth is needed. New semiconductor technologies based on SiGe have the potential to integrate digital and analogue functions on the same chip with low power consumption. Within the activity an integrated receiver and medium number of bits A/D converter shall be designed manufactured and tested in order to prove the concept for next generation of SAR instruments. Deliverables: Technology demonstrator and documentation Current TRL: TRL2 Target TRL: TRL3 Application Need/Date: TRL5 by 2010 Application/Mission: Future SAR missions Contract Duration: 24 months SW Clause : - Dossier0 Ref.: T-7752, T-7602 Consistency with Harmonisation Roadmap and Conclusions: Not directly linked to harmonised technology. Page 11 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T102-44ET Research into GPS Sea-Ice and Dry Snow Reflectometry Sea-Ice applications: Reflected GPS signals obtained over sea-ice during airborne campaigns and via the UK-DMC satellite suggest that phase coherency can be maintained for some time allowing accurate altimetry to be performed. UK-DMC data however, suffers from poor datation and relatively low SNR whereas airborne data is limited, expensive to acquire and provides only a snapshot of ice conditions. In order to investigate fully the potential for GNSS Reflectometry to derive sea-ice parameters including freeboard a longer term alternative needs to be found. This could be in the form of mounting up and down looking GPS antennas at a suitable location overlooking sea-ice e.g. Zeppelin Mountain on Svalbard, and then collecting and analysing data over a protracted period, say 6 months. The resultant dataset would be invaluable in determining the ability of GNSS-R techniques to retrieve sea-ice parameters. Dry-snow applications: Dome Concordia in Antarctica is currently being investigated for its suitability as a calibration site for SMOS. The extremely dry snow with minimal precipitation each year, make it very attractive for this purpose. To test this a radiometer has been mounted on a tower at Dome C. Research into GPS Reflectometry over land has shown that provided the moisture content does not change then the forward scattering of GPS signals correlates extremely well over the same ground-track on different days. Since L-band penetrates many metres into dry snow, by mounting a down-looking GPS on the same tower at Dome C, a dataset could be built up over time showing L-band forward scattering as a function of incidence angle at this location. This would be of great interest to scientists and add insight into the radiometer retrieved signal. In addition, if both L1 and L2 reflections could be captured then high accuracy TEC maps could be generated for the area. Deliverables: Long-term GPS-R dataset collected from a fixed position over sea-ice. Data analysis for altimetric purposes and ice properties. Dataset of L-band forward scattering as a function of incidence angle over the SMOS calibration site Dome C, Antarctica. High resolution TEC maps for the sky above Dome C. Current TRL: TRL2 Target TRL: TRL3 Application Need/Date: TRL5 by 2010 Future altimeter/ice mission, SMOS / Application/Mission: Contract Duration: 18 months SMOS ops SW Clause : - Dossier0 Ref.: Consistency with Harmonisation N/A Roadmap and Conclusions: Page 12 of 227
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