Number Of Signal Estimation And Beamforming Technology Research

DETECTION OF THE SIGNAL NUMBER AND BEAMFORMING ARE THE IMPORTANT ISSUE OF ARRAY SIGNAL PROCESSING.IT HAS WIDELY APPLICATIONS IN RADAR,SONAR, OSCILLATION MEASUREMENT,BIOMEDICINE,SEISMIC SIGNAL PROCESING AND ETC.THIS THESIS THOROUGHLY STUDIES THESE TWO ASPECTS BASED ON UNIFORM CIRCULAR ARRAY,IN ORDER TO SEPARATE THE SIGNAL.MAIN WORKS ARE AS FOLLOWS:1.Based on uniform circular array mode,the performance of three estimation of the signal number algorithms is analyzed by computer simulations.But in practice,coherent interference can arise when multipath propagation or"smart"jammers is present, a new method is proposed in order to estimate the number of coherent signals.2.Performance of Capon beamforming based on uniform circular array is studied.Several important evaluating indexes of beamforming are introduced,and the effectiveness of spectrum overlaping signal is studied. based on directional antenna and omnidirectional antenna.Finally a new method is presented in order to solve coherent beamforming, the real array can be virtual shifted utilizing the interpolate method,and the decorrelation signal will be abtained.3.Based on L array,cross array and uniform circular array mode,the performance of this three arrays is compared.4. The principle of CSM and ISM method is introduced,and based on ISM method and wideband focusing matrix,methods of beamforming and detection of the number of wideband signal are studied.Finally,an overview of author's work and the prospect of this article's research are presented.