Reconstruction of the Radar Image From Actual DDMs Collected by TechDemoSat-1 GNSS-R Mission

In this study, a new high-level remote sensing image product is generated by exploiting Global Navigation Satellite System-Reflectometry (GNSS-R) measurements collected by the TechDemoSat-1 (TDS-1) mission. This product consists of normalized radar cross-section (NRCS) measurements arranged in a gridded format. The product is obtained reconstructing NRCSs from actual TDS-1 delay Doppler maps (DDMs) using a deconvolution method based on the two-dimensional (2-D) truncated singular-value decomposition (TSVD). The proposed method is here tested, for the first time, on actual DDMs that include nonhomogeneous areas related to land/sea transition. Experimental results demonstrate that: 1) the gridded product can be successfully reconstructed from actual DDMs; 2) this product is suitable for imaging remote sensing purposes since it exhibits a uniform spatial resolution of 8 × 30 km within an area of around 40 × 40 km; 3) land/sea transitions, which can be hardly recognized in the DDM, can be well located in the gridded product.

[1]  Philip Jales,et al.  Implementing GNSS-Reflectometry in Space on the TechDemoSat-1 Mission , 2014 .

[2]  Eric E. Small,et al.  Normalized Microwave Reflection Index: A Vegetation Measurement Derived From GPS Networks , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[3]  Raul Onrubia Ibáñez,et al.  Soil Moisture mapping using forward scattered GPS L1 signals , 2013, 2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS.

[4]  Oliver Montenbruck,et al.  Innovative Remote Sensing Using the International Space Station: GNSS Reflectometry with GEROS , 2014, IGARSS 2014.

[5]  Adriano Camps,et al.  Tutorial on Remote Sensing Using GNSS Bistatic Radar of Opportunity , 2014, IEEE Geoscience and Remote Sensing Magazine.

[6]  M. Martín-Neira.  A pasive reflectometry and interferometry system (PARIS) application to ocean altimetry , 1993 .

[7]  Valery U. Zavorotny,et al.  Scattering of GPS signals from the ocean with wind remote sensing application , 2000, IEEE Trans. Geosci. Remote. Sens..

[8]  Maurizio Migliaccio,et al.  Two-Dimensional TSVD to Enhance the Spatial Resolution of Radiometer Data , 2014, IEEE Transactions on Geoscience and Remote Sensing.

[9]  C. Zuffada,et al.  5‐cm‐Precision aircraft ocean altimetry using GPS reflections , 2002 .

[10]  Hyuk Park,et al.  GNSS-R Derived Centimetric Sea Topography: An Airborne Experiment Demonstration , 2013, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[11]  Maurizio Migliaccio,et al.  Reconstruction of the Normalized Radar Cross Section Field From GNSS-R Delay-Doppler Map , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[12]  Philip Jales,et al.  Spaceborne GNSS reflectometry for ocean winds: First results from the UK TechDemoSat‐1 mission , 2015 .

[13]  Hyuk Park,et al.  Ocean Surface's Scattering Coefficient Retrieval by Delay–Doppler Map Inversion , 2011, IEEE Geoscience and Remote Sensing Letters.

[14]  Martin Unwin,et al.  Detection and Processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing , 2005, IEEE Transactions on Geoscience and Remote Sensing.

[15]  Adriano Camps,et al.  An Efficient Algorithm to the Simulation of Delay–Doppler Maps of Reflected Global Navigation Satellite System Signals , 2009, IEEE Transactions on Geoscience and Remote Sensing.

[16]  Maurizio di Bisceglie,et al.  Simulation of L-Band Bistatic Returns From the Ocean Surface: A Facet Approach With Application to Ocean GNSS Reflectometry , 2012, IEEE Transactions on Geoscience and Remote Sensing.

[17]  Raul Onrubia Ibáñez,et al.  Precision Bounds in GNSS-R Ocean Altimetry , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[18]  Hyuk Park,et al.  Using GNSS-R Imaging of the Ocean Surface for Oil Slick Detection , 2013, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[19]  Stephen J. Katzberg,et al.  Wind speed measurement using forward scattered GPS signals , 2002, IEEE Trans. Geosci. Remote. Sens..

[20]  Claudio Estatico,et al.  Analysis of Reconstructions Obtained Solving $l^p$-Penalized Minimization Problems , 2015, IEEE Transactions on Geoscience and Remote Sensing.

[21]  Randall Rose,et al.  The CYGNSS nanosatellite constellation hurricane mission , 2012, 2012 IEEE International Geoscience and Remote Sensing Symposium.

[22]  Per Christian Hansen,et al.  Rank-Deficient and Discrete Ill-Posed Problems , 1996 .

[23]  Weimin Huang,et al.  Dual Antenna Space-Based GNSS-R Ocean Surface Mapping: Oil Slick and Tropical Cyclone Sensing , 2015, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[24]  Daniele Borio,et al.  A Galileo IOV assessment: measurement and position domain , 2014, GPS Solutions.