In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise d...In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise density increase.A criterion of track extrapolation is used to construct state transition set,root label is marked by state transition set to obtain the distribution information of multiple targets in measurement space,then measurement plots of multi-frame are divided into several clusters,and finally multi-frame track-before-detect algorithm is implemented in each cluster.The computational complexity can be reduced by employing the proposed algorithm.Simulation results show that the proposed algorithm can accurately detect multiple targets in close proximity and reduce the number of false tracks.展开更多
An approach is proposed for predicting turning and acceleration motion trend of the tropical cyclones over the South China Sea for 72 h in the extrapolated track coordinates.Cross-track (CT)and along-track(AT)componen...An approach is proposed for predicting turning and acceleration motion trend of the tropical cyclones over the South China Sea for 72 h in the extrapolated track coordinates.Cross-track (CT)and along-track(AT)components are defined according to the persistently extrapolated track coodinates based on observed positions at the initial and past 24 h times.A kind of straight- forward measure may be provided with CT and AT components for typhoon turning motion and ac- celeration motion.Canonical correlation analysis(CCA)is performed to reveal the correlaotions be- tween tropical cyclone tracks and environmental 500 hPa geopotential height fields.A stepwise dis- criminate analysis technique is adopted to derive the classification functions of the respective three categories for AT and CT components.Especially,categorical combinations of CT and AT compo- nents are divided into possible 9 regions corresponding with tropical cyclone behaviors.Not only can 9 motion trends of a tropical cyclone be predicted,but also the location and its maximum error at least in certain direction are available.The perfect prediction(PP)verifications indicate that the percent corrects for the CT and AT categories are 67% and 69% in the independent samples,73% and 53% in the dependent samples,respectively,higher than that of 33.3% for random chance; moreover,the rate for successfully forecasting that in which one of the nine regions the tropical cy- clones will fall at 72 h is about 40%,also higher than the stochastic probability of 11%.The method has been proved to be skillful and promising.展开更多
基金supported by the Innovation Project of Science and Technology Commission of the Central Military Commission,China(No.19-HXXX-01-ZD-006-XXX-XX)。
文摘In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise density increase.A criterion of track extrapolation is used to construct state transition set,root label is marked by state transition set to obtain the distribution information of multiple targets in measurement space,then measurement plots of multi-frame are divided into several clusters,and finally multi-frame track-before-detect algorithm is implemented in each cluster.The computational complexity can be reduced by employing the proposed algorithm.Simulation results show that the proposed algorithm can accurately detect multiple targets in close proximity and reduce the number of false tracks.
文摘An approach is proposed for predicting turning and acceleration motion trend of the tropical cyclones over the South China Sea for 72 h in the extrapolated track coordinates.Cross-track (CT)and along-track(AT)components are defined according to the persistently extrapolated track coodinates based on observed positions at the initial and past 24 h times.A kind of straight- forward measure may be provided with CT and AT components for typhoon turning motion and ac- celeration motion.Canonical correlation analysis(CCA)is performed to reveal the correlaotions be- tween tropical cyclone tracks and environmental 500 hPa geopotential height fields.A stepwise dis- criminate analysis technique is adopted to derive the classification functions of the respective three categories for AT and CT components.Especially,categorical combinations of CT and AT compo- nents are divided into possible 9 regions corresponding with tropical cyclone behaviors.Not only can 9 motion trends of a tropical cyclone be predicted,but also the location and its maximum error at least in certain direction are available.The perfect prediction(PP)verifications indicate that the percent corrects for the CT and AT categories are 67% and 69% in the independent samples,73% and 53% in the dependent samples,respectively,higher than that of 33.3% for random chance; moreover,the rate for successfully forecasting that in which one of the nine regions the tropical cy- clones will fall at 72 h is about 40%,also higher than the stochastic probability of 11%.The method has been proved to be skillful and promising.
