This paper derives the polarization scattering matrix of both the warship target and the interferential chaff conditioned on the exit of rain and snow cluster,and furthermore,proposes a method to recognize the chaff a...This paper derives the polarization scattering matrix of both the warship target and the interferential chaff conditioned on the exit of rain and snow cluster,and furthermore,proposes a method to recognize the chaff and warship by analyzing their corresponding polarization information.This method mainly aims to the radar,which can receive both the left and right circularly polarized wave to catch the full polarization information of echoes,and then acquires more accurate polarization characteristics of the target and chaff after getting rid of the impacts of rain and snow cluster from the polarization scattering power matrix of echoes.In order to further improve the recognition probability,the non-linear polarization transformation is introduced to make the separation of target and chaff more realizable.It indicates that the resulting performance is incredible for the traditional recognition in time and frequency domain.展开更多
The characteristics of local thundersnow at ne spatiotemporal scale on 9 and 10 November 2009 in Beijing were analyzed,using wind pro ler,microwave radiometer,automatic weather station,Doppler weather radar,and satell...The characteristics of local thundersnow at ne spatiotemporal scale on 9 and 10 November 2009 in Beijing were analyzed,using wind pro ler,microwave radiometer,automatic weather station,Doppler weather radar,and satellite data.Furthermore,the causes of winter convection are discussed.The results showed that it was reflux weather.The cause of the thunder and lightning was the elevated convection above the lower cold and dry air,and the trigger for convection was the short wave trough and convergencein the middle level.This thundersnow event developed from monsoon-like long-lasting water vapor transport at 850 hPa from the South China Sea along with strong instability of,and convergence in,the conveyor layer.展开更多
文摘This paper derives the polarization scattering matrix of both the warship target and the interferential chaff conditioned on the exit of rain and snow cluster,and furthermore,proposes a method to recognize the chaff and warship by analyzing their corresponding polarization information.This method mainly aims to the radar,which can receive both the left and right circularly polarized wave to catch the full polarization information of echoes,and then acquires more accurate polarization characteristics of the target and chaff after getting rid of the impacts of rain and snow cluster from the polarization scattering power matrix of echoes.In order to further improve the recognition probability,the non-linear polarization transformation is introduced to make the separation of target and chaff more realizable.It indicates that the resulting performance is incredible for the traditional recognition in time and frequency domain.
基金supported by the International Partnership Program of the Chinese Academy of Sciences [grant number134111KYSB20180021]the National Natural Science Foundation of China [grant numbers 41590871 and 41475136]the International Science&Technology Cooperation Program of China [grant number 2013DFG22820]
文摘The characteristics of local thundersnow at ne spatiotemporal scale on 9 and 10 November 2009 in Beijing were analyzed,using wind pro ler,microwave radiometer,automatic weather station,Doppler weather radar,and satellite data.Furthermore,the causes of winter convection are discussed.The results showed that it was reflux weather.The cause of the thunder and lightning was the elevated convection above the lower cold and dry air,and the trigger for convection was the short wave trough and convergencein the middle level.This thundersnow event developed from monsoon-like long-lasting water vapor transport at 850 hPa from the South China Sea along with strong instability of,and convergence in,the conveyor layer.
