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The BISSAT mission: a bistatic SAR operating in formation with COSMO/SkyMed X-band radar
No full textMission analysis of a bistatic SAR operating in formation with a main monostatic missio
The BISSAT mission: a bistatic SAR operating in formation with COSMO/SkyMed X-band radar
No full textMission analysis of a bistatic SAR operating in formation with a main monostatic missio
Bistatic SAR for Earth Observation
No full textThis chapter presents a case study of a spaceborne BSAR based on a small satellite equipped with a receiving only antenna flying in formation along parallel orbits with a main monostatic mission. First of all, payload aspects are dealt with, focusing in particular on overall BSAR architecture and performance, and presenting solutions for key technical issues of the bistatic mission. The models presented in chapter 2 are then applied to perform bistatic mission analysis, and the results and performance are reported in detail. After a definition of the orbital configuration of the formation, time histories of essential parameters for swath overlap during bistatic observation are derived, showing the possibility of carrying out a bistatic mission with a low cost satellite, exploiting expected attitude and pointing capabilities of the main mission, but without posing any constraint on its design. Finally, Doppler and resolution characteristics of bistatic and monostatic SAR data are compared
Spaceborne Bistatic Synthetic Aperture Radar
No full textIn order to maintain adequate swath overlap along the orbit, BSAR missions require careful selection of orbits and pointing which must also take into account system-level issues, for instance: impacts on transmitting/receiving radar mission, requirements on bistatic payload/bus, lifetime. This chapter presents an overview of candidate orbits for BSAR mission and highlights orbit design in the case of parallel orbits. In addition, a comprehensive analysis of attitude and pointing geometry is presented. A model is developed, which is applicable independently from the orbital configuration selected for the bistatic formation. The procedure is based on spherical trigonometry and allows effects of large, time-variant baselines to be accounted for, when different strategies are selected to share tasks and complexities between main mission and parasitic spacecraft. Basically, the model has been realized for mission analysis and simulation, as will be shown in the next chapter. However, it can also be applied to develop on-board software for real-time modifying pointing angles, using satellites positions as input, in order to attain swath overlap with predefined bistatic baselines
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