Sea surface effects on phase coherence in emulated bistatic radar systems

2005 ◽  
Author(s):  
J. Palmer ◽  
M. Martorella ◽  
A. Capria ◽  
B. Littleton ◽  
J. Homer ◽  
...  
Keyword(s):  
Surface Effects ◽  
Phase Coherence ◽  
Sea Surface ◽  
Bistatic Radar ◽  
Radar Systems ◽  
Sea Surface Effects

Realistic weather conditions and removal of time-varying sea-surface effects: Application on ocean-bottom-cable data

Geophysics ◽  
2020 ◽  
Vol 85 (3) ◽  
pp. V297-V315
Author(s):  
Elsa Cecconello ◽  
Walter Söllner
Keyword(s):  
Weather Conditions ◽  
Surface Effects ◽  
Sea Surface ◽  
Ocean Bottom ◽  
Time Varying ◽  
Theoretical Derivation ◽  
Data Set ◽  
Wave Heights ◽  
Sea Surface Effects ◽  
The Impact

In marine seismic acquisition, seismic reflections at the sea surface, such as sea-surface ghosts and multiples, affect the accuracy of the retrieved subsurface reflections and reduce the usable frequency bandwidth. These sea-surface effects tend to increase with the increasing roughness of the weather conditions. Consequently, processing techniques that neglect the roughness and time variation of the sea surface induce errors in the data that could compromise the validity of the final images and interpretations. We study the impact of time-varying rough sea surfaces using a modeling method derived from the Rayleigh reciprocity theorem for time-varying surfaces, and we analyze errors in the source-deghosting operation. We show that the source-deghosting limitations are weather dependent for data including sea-surface multiples: For calm sea states (wave heights below 1.25 m), the error made by the source-deghosting process is negligible; however, for rough seas (wave heights above 1.5 m), it becomes significant and blurs the deghosted image at the sea-surface multiple signals. To accurately remove all sea-surface effects from the seismic data, we simultaneously apply source-deghosting and multiple-removal operations to the same up-going wavefield. This procedure is shown to be weather independent based on our theoretical derivation and the synthetic results. Finally, this is tested on a 2D OBC data set. Comparing the proposed inversion to up-down deconvolution, we observe similar features in both wavefields: Source ghosts and sea-surface multiples seem to have been correctly removed from the data, and the inverted result indicates a slightly better resolution for deeper reflections.

Sea surface effects on the radar return from a periscope

1990 ◽  
Vol 137 (2) ◽  
pp. 149 ◽  
Author(s):  
S.P. Tonkin ◽  
D.L. Dolman
Keyword(s):  
Surface Effects ◽  
Sea Surface ◽  
Sea Surface Effects

Sea surface effects on reverberation vertical coherence and inverted bottom acoustic parameters in the East China Sea

2004 ◽  
Vol 115 (5) ◽  
pp. 2550-2550 ◽  
Author(s):  
Ji‐Xun Zhou ◽  
Xue‐Zhen Zhang ◽  
Peter H. Dahl ◽  
Jeffrey A. Simmen
Keyword(s):  
East China Sea ◽  
Surface Effects ◽  
Sea Surface ◽  
East China ◽  
The East China Sea ◽  
Acoustic Parameters ◽  
China Sea ◽  
Sea Surface Effects
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