A Method On Calibrating Array Gain And Phase Error Based On Channel Switching

As an important research content of array signal processing,direction of arrival(DOA)is widely applied in radar,sonar,communication system,intelligent home appliances and intelligent conference system.It's necessary for most of the DOA estimation algorithms that the array manifold is known exactly,but the array manifold is often changed by the surrounding environment or the device itself in practical engineering application.The performance of these algorithms tend to deteriorate severely and even fail.Thus,with the important theoretical significance and practical value,the DOA estimation algorithm based on array error is an important direction in the field of array signal processing in recent years.In this paper,we mainly study the correction of channel amplitude and phase error,and present a correction method of the amplitude and phase error of array based on channel switching,and the main work can be summarized as follow:Firstly,we introduce the theory of two DOA estimation algorithms,namely Interferometer direction finding method and multiple signal classification(MUSIC)spectral estimation direction finding method,then the effects of amplitude and phase errors on the two direction finding algorithms are introduced,and the correctness of the analysis is proved by simulation experiments.Next,we propose the Interferometer direction finding method based on channel switching and MUSIC Spectral estimation direction finding method based on channel switching,then deduce the details of the two methods and prove their availability through the simulation under the different SNRs and the different snapshots conditions.Then,we analyse the optimization methods of the two methods.Before that,we introduce the Interferometer direction finding method with the multichannel enhancement,and utilize the theory of this algorithm to optimize the Interferometer direction finding method based on channel switching.Analogously,we study the signal subspace direction finding method based on the partly calibration,and then utilize the theory of this algorithm to optimize the MUSIC Spectral estimation direction finding method based on channel switching.After introducing the theory of the optimization methods,we prove the validity of the two methods through the simulation experiments.Finally,we summarize the work of the whole paper,and prospects the future development,and consider the next work in the future.