Multipath Doa Estimation Of Cyclostationary Signals In Impule-noised Environments

Direction-of-arrival(DOA)estimate is important means of wireless passive position technology.It has been widely used in radar,wireless communication position system,sonar,military and so on.DOA estimate of cyclostationary signal algorithm is able to filter out the interference signal and the signal which is not specified in the cycle frequency.However,the kinds of algorithms will be invalid when the received signal is multipath signal,which means that it is not suitable for multipath DOA estimation.So,this paper first studiesh the multipath DOA estimation of cyclostationary signals.In practical applications,when the signal is mixed with impulse noise,the algorithm based on Gauss model is invalid,so this paper mainly focuses on the DOA estimation under impulsive noise environment.The main researches are listed as follows:(1)Since multipath DOA estimation of cyclostationary signals is a difficult work,by combining the spatial smoothing algorithm and the modify theory of modify MUSIC algorithm with Cyclic MUSIC algorithm,Cyclic root-MUSIC algorithm and Cyclic ESPRIT algorithm,five new algorithms-Spatial Smoothing Cyclic root-MUSIC algorithm,Spatial Smoothing Cyclic ESPRIT Calgorithm,Modify Cyclic MUSIC algorithm,Modify Cyclic root-MUSIC algorithm,Modify Cyclic ESPRIT algorithm are proposed.Then the multipath DOA estimation of cyclostationary signals is realized.(2)Since multipath DOA estimation of cyclostationary signals in impulsive noise is a difficult work,by combining the five new algorithms(Spatial Smoothing Cyclic root-MUSIC algorithm,Spatial Smoothing Cyclic ESPRIT Calgorithm,Modify Cyclic MUSIC algorithm,Modify Cyclic root-MUSIC algorithm,Modify Cyclic ESPRIT algorithm)with the fractional lower order cyclic statistics,five new algorithms-Spatial Smoothing FLOM Cyclic root-MUSIC algorithm,Spatial Smoothing FLOM Cyclic ESPRIT Calgorithm,Modify FLOM Cyclic MUSIC algorithm,Modify FLOM Cyclic root-MUSIC algorithm,Modify FLOM Cyclic ESPRIT algorithm-are proposed.Then the multipath DOA estimation of cyclostationary signals in impulse noise is realized.