PROJECT TITLE :
Inclined Geosynchronous Spaceborne–Airborne Bistatic SAR: Performance Analysis and Mission Design
Geosynchronous synthetic aperture radar (GEO-SAR) offers new opportunities for continuous Earth observation missions with massive coverage and short revisit cycle. The unique features of GEO-SAR gift huge potentials for bistatic observation applications. In this paper, the concept and blessings of GEO bistatic SAR (GEO-BiSAR) are initial investigated. The system consists of a GEO illuminator and an airborne receiver, such as an airplane or a near-area vehicle. Compared with a monostatic GEO-SAR system, the bistatic configuration will give finer spatial resolution and higher signal-to-noise ration (SNR) with less system complexity. The spatial resolution characteristics are then analyzed based on generalized ambiguity operate, where the time-varying GEO velocity, Earth rotation, and ellipsoid Earth surface are taken into consideration. Meanwhile, the bistatic SNR is analyzed using the mixing equation model. During this paper, the mission design for GEO-BiSAR aims at identifying a collection of receiver flight parameters and bistatic configurations to get the specified spatial resolution and SNR. Based mostly on the specified imaging performance of a specific application background, the mission style method is modeled as a nonlinear equation system (NES). Finally, a mission design methodology based mostly on quick nondominated sorting genetic algorithm is proposed to unravel the NES and acquire multiple optimal solutions to guide the receiver flight missions. Examples of the mission design process are given to validate the effectiveness of the proposed method. The results of the mission design can be conveniently used to guide the receiver flight mission for the desired imaging performance, that is very fascinating in sensible applications.
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