Spatial decorrelation in GNSS-based SAR coherent change detection

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Colleges, School and Institutes


This paper analyzes the spatial decorrelation between repeat-pass bistatic synthetic aperture radar (BSAR) images with Global Navigation Satellite Systems as transmitters and a fixed receiver. This study is needed in the development of such a system to monitor temporal changes in a scene. The main challenge is that, in this bistatic configuration, spatial coherence heavily depends on the data acquisition geometry. The appropriate theoretical framework to describe spatial coherence for this case is developed by extending well-established monostatic models and, in principle, can be applied to any fixed-receiver BSAR with a spaceborne transmitter. Theoretical results are initially supported by Monte Carlo simulations. Finally, the validity of the model is confirmed by comparing real images.


Original languageEnglish
Article number2321145
Pages (from-to)219-228
Number of pages10
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number1
Early online date22 May 2014
Publication statusPublished - 1 Jan 2015


  • Bistatic synthetic aperture radar (BSAR), Coherent change detection (CCD), GNSS-based SAR, Spatial decorrelation