Optimal configuration of spaceborne bistatic SAR with GEO transmitter and LEO receiver

Optimal configuration of spaceborne bistatic SAR with GEO transmitter and LEO receiver

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Spaceborne bistatic synthetic aperture radar (BiSAR) with a geosynchronous (GEO) transmitter and a low-earth-orbit (LEO) receiver can offer high signal-to-noise ratio, fine resolution and large surveillance area, which provides great potential for future Earth observation technology. Nevertheless, due to complex bistatic geometry and big differences of orbital characteristics, the configuration design of GEO-LEO BiSAR remains a challenge. To address the issue, mathematic models between the indicators related to the imaging performance and the configuration parameters are firstly derived based on the geometry analysis. Then, a general nonlinear multivariate objective function is presented for the desired imaging performance. Accordingly, the configuration design problem can be transformed to solve nonlinear multivariate optimisation equation. A novel optimal configuration design method based on the simulated annealing algorithm is presented. Finally, simulation results are provided for two typical observational missions to verify the effectiveness of the proposed method.

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