Decorrelation in GEO SARs due to radio frequency interferences

Abstract

Geosynchronous synthetic aperture radar (GEO SAR) is a very remarkable tool for monitoring rapid geologic disasters due to its short revisit time and long coverage time for targets. However, its large swath makes the system easily impacted by radio frequency interferences (RFIs), which can cause the decorrelations in images and interferograms. In this study, the authors establish the RFI decorrelation model in GEO SARs based on the signal-to-interference-plus-noise ratio analysis. Moreover, the mitigation method for RFI decorrelation based on proper system parameters design is proposed. Finally, simulations are conducted to evaluate the RFI decorrelations under different target types and orbits, and the corresponding required system parameters for mitigation are analysed as well.

Keywords

• radar imaging
• synthetic aperture radar
• decorrelation
• radar interference
• interference suppression
• geosynchronous synthetic aperture radar
• rfi decorrelation model
• signal-to-interference-plus-noise ratio analysis
• radiofrequency interferences
• geologic disaster monitoring
• geo sar image decorrelation
• interferograms
• interference mitigation