Formation Considerations for Distributed Satellite SAR Systems

Inhalt:
Distributed multichannel synthetic aperture radar (SAR) imaging is a promising concept for future Earth observation missions. The multichannel concept can mitigate the pulse repetition frequency (PRF) or minimum SAR antenna area constraints inherent to single-channel SAR systems. Thus high azimuth resolution can be maintained, while acquiring wide swathes. This significantly increases the imaging capabilities compared to current missions in terms of high spatial and temporal resolution. An important step in the design of a multi-satellite mission is the selection of an appropriate formation. Besides the driving impact on the mission objectives also safety aspects and operational requirements have tobe considered. In this paper an exemplary Helix formation is analyzed and the impact of different options on the azimuth ambiguity performance is discussed.