Impact of the elevation angle in the coherence time as a function of the sea wave height

For a given geometry, the coherence time of a GNSS-R waveform can be initially related to the significant wave height. However, when the coherence time is analyzed, several issues shall be considered, such as the geometry (i.e altitude, elevation angle). This work presents a review of the coherence time and its dependence on the geometry. In addition, the impact that the SWH has on both the coherence time and elevation angles is analyzed. Real data from different scenarios (spaceborne, airborne, and ground based) are used in this study.

[1]  Manuel Martín-Neira,et al.  Cross-Correlation Waveform Analysis for Conventional and Interferometric GNSS-R Approaches , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[2]  Manuel Martín-Neira,et al.  The PARIS Ocean Altimeter In-Orbit Demonstrator , 2011, IEEE Transactions on Geoscience and Remote Sensing.

[3]  E. Wolf,et al.  Principles of Optics (7th Ed) , 1999 .

[4]  Manuel Martín-Neira,et al.  PARIS Interferometric Technique proof of concept: Sea surface altimetry measurements , 2012, 2012 IEEE International Geoscience and Remote Sensing Symposium.

[5]  Manuel Martín-Neira,et al.  Mitigation of Direct Signal Cross-Talk and Study of the Coherent Component in GNSS-R , 2015, IEEE Geoscience and Remote Sensing Letters.

[6]  James L. Garrison,et al.  The autocorrelation of waveforms generated from ocean-scattered GPS signals , 2006, IEEE Geoscience and Remote Sensing Letters.

[7]  Martin Unwin,et al.  The Space GPS Reflectometry Experiment on the UK Disaster Monitoring Constellation Satellite , 2003 .

[8]  Manuel Martín-Neira,et al.  Optimization and Performance Analysis of Interferometric GNSS-R Altimeters: Application to the PARIS IoD Mission , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

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

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

[11]  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.

[12]  C. Zuffada,et al.  Sensitivity analysis of wind vector measurements from ocean reflected GPS signals , 2003 .