Session I: Status Reports on Ongoing and Future Missions Chairs: M.Shimada (JAXA) and P. Snoeij (ESA)
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1 Session I: Status Reports on Ongoing and Future Missions Chairs: M.Shimada (JAXA) and P. Snoeij (ESA) Canadian Radarsat Mission status-s. Cote Operating far beyond design lifetime (RSAT-1: 16 years, ASAR: almost 10 years) Mission lives have been extended with measures not planned in original design Radarsat-1 performance within 1dB over 80% of the swath Maneuvers due to space debris collision avoidance increasing ARC is used for the geometric calibration TSX and TDMX mission status M. Zink TsX 4.5 year in orbit, TdX well within requirements Flexible systems allow implementing new modes 250m tube maintenance, and 10cm accuracy of geolocation PPP satellite Two products on DEM are on the shop, 12x12m<10m and level4 < 5m 1 Thursday SAR Cal-Val 04-Jun-2009 Workshop
2 Session I: Status Reports on Ongoing and Future Missions ALOS-2/PALSAR-2 mission status M. Shimada PALSAR follow-on satellite carrying L-band SAR and to be Launched in August 2013 Orbit cycle 14 days and 500m orbit tube to increase the interferometric coherence RA will be issued July 2012 Calibration sites will selected globally Sentinel-1 constellation P. Snoeij Commissioning Phase outline presented TOPS mode new element 3 months commissioning challenges 7 years mission life in dawn-dusk orbits using the same frequency with Radarsat. 2 Thursday SAR Cal-Val 04-Jun-2009 Workshop
3 Session I: Status Reports on Ongoing and Future Missions SAOCOM constellation M. Thibeault Soil moisture mapping for the Panpa is one of the main system drivers, Polarimetry data will be used. Uses TOPSAR mode Validation plan in progress Joint project with Cosmo-skymed: SIASIGE Tandem-L mission proposal M. Zink 15 meter reflector with digital beam steering and analogue beam forming, scan on receive Helix orbit and 2 global coverage a week. Soil moisture at 50 m product size 5-10 vol% 3 Thursday SAR Cal-Val 04-Jun-2009 Workshop
4 Session II: SAR Sensor Calibration and Validation Activities Chairs : S.Côté (CSA) and M.Thibeault (CONAE) TanDEM-X SAR System Verification (Mathias Weigt, DLR) The performance of the TDX satellite is outstanding, with aspects unique to close formation flying validated through separate monostatic and bistatic commissioning, including inter-satellite interference, mutual illumination avoidance, synchronization. In-Orbit Calibration of Both TDX Satellites (Dirk Shrank, DLR) A calibration strategy based on antenna model & on-board calibration allowed to efficiently calibrate and validate the very accurate radiometric and geometric performance of TDX, matching TSX on all aspects. TDX DEM Performance and Calibration (Manfred Zink, DLR) For certain areas, relative height requirement (<2m) is achieved with a single acquisition; coherence is improved for forest areas through formation adaptation. Interferometric and baseline calibration is accurate to 1 mm, with absolute height errors <10m before DEM calibration; DEMs show remarkable quality. 4 Thursday SAR Cal-Val 04-Jun-2009 Workshop
5 Session II: SAR Sensor Calibration and Validation Activities Interferometric TanDEM-X Data Processing First Operational Experiences (Birgit Schättler, DLR) Operational processing of global DEM data started end of Aug. 2011, and processing is reliable and accurate: excellent performance of bistatic synchronisation, and radargrammetry is used to derive absolute height information in addition to interferometric phase information, without the need of external reference data. SAOCOM Calibration Strategy (Marc Thibault & Julian Giardini, CONAE) On-board and external calibration concepts are integrated with an antenna model for the calibration strategy. Internal calibration performance, with a focus on drifts estimation accuracy, was presented. Corner reflectors (X & L bands) are being deployed in Argentina, and areas of Amazon and possibly Congo will be exploited as distributed targets. 5 Thursday SAR Cal-Val 04-Jun-2009 Workshop
6 Session II: SAR Sensor Calibration and Validation Activities Canadian Governement Calibration Activities: Assessment of Distributed Target Sites Within the RADARSAT Program (Stephane Cote, CSA) Radiometric cal-val of current and future space-based SARs would benefit from further characterization of natural sites. R2 data show that areas of Cameroon share many Amazon properties while the Dome-C region in Antarctica displays very good stability and smoothness in co-pol. Assessment and Calibration of Polarimetric RADARSAT-2 Using Transponder Measurements (Ridha Touzi, CCRS) Based on a new approach making use of a polarimetric transponder, R2 antenna cross-talk is low (-32 db) even before pol. calibration, and product-supplied pol. calibration is good for general applications. The transponder technique could be a calibration option where very low cross pol. returns are needed. 6 Thursday SAR Cal-Val 04-Jun-2009 Workshop
7 Session II: SAR Sensor Calibration and Validation Activities AirMOSS P-Band SAR Calibration (Alexandra Chau, JPL) For this radar, the calibration is based on temperature sensing, internal calibration paths, and corner reflectors for radiometric and geometric validation. In addition to the Rosamond CR array, a series of larger, 4.8m CRs were designed with a modular approach using triangular panels as building elements. 7 Thursday SAR Cal-Val 04-Jun-2009 Workshop
8 Session II: SAR Sensor Calibration and Validation Activities Statements / Recommendations TerraSAR-X and TanDEM-X demonstrate outstanding performance levels. It would be very interesting to have samples available for scientific use. With the increasing number of SAR beams available per mission, the use of an antenna model answers to the need for efficient cal-val (together with internal calibration, natural and artificial targets). To increase robustness & flexibility of space-based SAR cal-val, characterization of natural targets other than the Amazon should be pursued with current missions, in multiple bands (L, C, X). R2 has very good antenna isolation. When polarimetrically configurable, transponders could prove to be useful tools in estimating low cross-talks. P-Band airborne SAR calibration for soil-moisture applications represents distinctive challenges: need of large artificial targets, and high accuracy due to saturation of backscatter levels with soil moisture. 8 Thursday SAR Cal-Val 04-Jun-2009 Workshop
9 Distributed Target Sites (RADARSAT Program) Distributed Target Sites Satellite Modes (tested by CSA) Lat-Lon Polygon Used by Comments Amazon Prime area RADARSAT-1 RADARSAT-2 9 Thursday SAR Cal-Val 04-Jun-2009 Workshop All Greater Amazon 1-E RADARSAT-2 All Greater Amazon 1-W RADARSAT-2 All Greater Amazon 2-E RADARSAT-2 All Greater Amazon 2-W RADARSAT-2 All Canadian Boreal Forest RADARSAT-1 Wide Standard Extended High Cameroon RADARSAT-2 All (under validation) Dome-C RADARSAT-2 All (under investigation) Co-pol S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W N W N W N W N W N W N E N E N E N E N E S E S E S E S E S E S E S E S E S E S E S E S E S E S E S E S E S E S E MDA MDA CSA MDA CSA MDA CSA MDA CSA CSA CSA CSA Area was used by CSA as the prime area for RADARSAT-1 for about 10 years. Well-characterized and accepted as an international area in 2004 by the Committee on Earth Observation Satellites, SAR Cal/Val Working Group. Is also the prime area for RADARSAT-2 for absolute radiometric calibration (MDA). JAXA (Japan), ESA and DLR have areas that contains this area, or that have been contained by this area. Area validated by CSA with RADARSAT-1 in 2006 in support of MDA, to enlarge the valid Amazonian calibration sites in anticipation of the large number of RADARSAT-2 modes to be monitored. Validated since 2003, used as the prime RADARSAT-1 site since 2008 after the termination of the RADARSAT-1 On-Board Recorder, use which allowed cost-efficient data acquisition over the Amazon. Amazon is out of reach of any active and certified receiving facility. This Boreal Forest site near Hearst, Ontario, is within reach of both Prince Albert and Gatineau facilities. Area under validation Area under investigation
10 Session III: Advanced Calibration Methods Chairs : M. Zink (DLR) and F.Meyer (UAF) Frequency/bandwidth allocations for remote sensing have to be defended and possibly enlarged (L-Band to 120MHz, X-Band to 1200MHz) interference from ground radars expected to increase New statistical approach for correcting ionospheric distortions is under investigation more reliable phase estimation from interferometric stacks expected Super sites for which remote sensing data as well as ground truth can be shared shall be supported - the Laurentides Reserve in Quebec is a good example for such a site Free access to software packages like GMTSAR INSAR software is highly recommended. These packages shall be validated e.g. via comparison with similar tools. 10 Thursday SAR Cal-Val 04-Jun-2009 Workshop
11 Session IV: Emerging SAR Techniques Chairs : D.Atwood (UAF) and B.Schättler (DLR) Shimada: Model-based Polarimetric Calibration Alternative method to SAR calibration using quad-pol (without assumption of reciprocity). Results comparable, but different from alternative means. Validity demonstrated by resultant polarimetric signature. Schattler: Advances in Pixel Location Accuracy Outline efforts to achieve (upgraded) 1m pixel location specs. Effects of ionosphere, troposphere, solid earth tides, and continental drift must be modeled and removed. Result is geolocation accuracy that permits glacier velocity studies, co-seismic motion measurements, and reference for optical imagery. Meyer: Modeling Atmospheric Signals Turbulent atmosphere poses challenges for interferometry. Can it be 1)accurately modeled with WRF or 2) just stochastically characterized? WRF yields poor phase screen, but offers excellent linearity in variance. Variance magnitudes are underestimated by 3x. 11 Thursday SAR Cal-Val 04-Jun-2009 Workshop
12 Session IV: Emerging SAR Techniques Hawkins: Residual Motion Compensation for Repeat Pass Despite 5m flight tubes for UAVSAR, residual motion poses problems for repeat track interferometry. Use image correlation to determine baseline slopes. Use correlation to remove bad data Pi: Sounding from Low Earth Orbit Proposed OASIS will use 45MHz signal to sound subsurface beneath sand and glacial ice. Problem is impact of atmosphere on VHF signal. Rigorous modeling points to data collection during 4AM passes. 12 Thursday SAR Cal-Val 04-Jun-2009 Workshop
13 Session V: Emerging SAR Applications Chairs : W.Boerner (UIC) and M.Thankappan (GA) Making UAVSAR More Accessible from PolSAR Classification D. Atwood Polarimetric L band SAR developed by JPL flown on Gulfstream III aircraft but built for UAV; 20 km swath width Good data holdings from the collections ASF is the distribution centre Value-added products Need for radiometric normalisations for accurate classification Results of UAVSAR Airborne SAR Repeat-Pass Interferometry R.Muellerschoen Demonstrated multi-aperture interferometry can produce azimuth displacements comparable to amplitude correlation displacements Potential advantages of MAI range displacements uncorrelated from azimuth estimates 13 Thursday SAR Cal-Val 04-Jun-2009 Workshop
14 Session V: Emerging SAR Applications The Alaska Satellite Facility s InSAR Initiative G.Bryson User interface that has provision of InSAR compatible settings for data discovery 2 million granules in the archive 4 InSAR product packages Ground Based Radars Applied to Glacier Observation M.Fahnestock Demonstration of glacier applications Importance of satellite based long-term observation of glaciers UAV Based Remote Sensing Efforts at UAF G.Walker UAV based applications for hazardous, inaccessible environments using lightweight payloads (still / video cameras and X-band SAR) 14 Thursday SAR Cal-Val 04-Jun-2009 Workshop
15 Session V: Emerging SAR Applications Sub-Mesoscale Imaging of the Ionosphere with SMAP X.Pi How to turn SMAP into a Faraday Polarimeter Ionospheric precursor of earthquakes? Heike Thursday SAR Cal-Val 04-Jun-2009 Workshop
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