Double-mode Integrated System for Observing Sea-surface Wind Field

Spaceborne SAR and scatterometer have their own advantages and weaknesses for measuring sea-surface wind field. The former can measure wind speed with high spatial resolution, but the accuracy is depended on the accuracy of external wind direction. The latter can obtain high-accuracy wind direction and speed simultaneously, but the spatial resolution is relatively low. This paper proposes a new system adopting a single digital antenna to integrate SAR and scatterometer to observe sea-surface wind field simultaneously based on multiple beamforming, and designs the joint time sequence of the transceiver. The proposed double-mode integrated system can not only improve observation accuracy of sea-surface wind field, but also expand observable areas.