A variational method for the retrieval of 3D wind field by bistatic Doppler radar network is developed,and its performance is evaluated.This bistatic Doppler weather radar network consists of one X-band Doppler radar and one passive low-gain bistatic receiver.To allow for measurement error,this method uses the two radial velocities as weak constraints and uses the continuity equation as a strong constraint in a cost function.Improvements are brought to the classical upward integration of the continuity equation,using a weighted combination of upward and downward integrations and its adjoint.The wind field retrieval experiments are carried out by the actual observation data,and compared with the wind filed retrieved by the two Doppler radars.The results show that the wind field is very close,and the synchronous observation technology of the bistatic Doppler radar network is reasonable,which has the potential application in real-time detection of 3D wind field,especially for detecting near surface wind field.
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