Research On Spatial Spectrum Direction Finding Method Based On MUSIC Algorithm

In recent years,the development of array signal processing technology in the signal processing field is relatively rapid,and the direction of arrival(DOA)estimation is a basic direction for array signal processing technology research.It has extremely wide applications in seismology,sonar,radar,and satellite fields.and development.The high-resolution direction-of-arrival(DOA)estimation algorithm in the direction of DOA estimation is most concerned by researchers.The classical MUSIC(multiple signal classification)algorithm is the focus of this study.During the research process,the status quo and development history of the spatial spectrum estimation technology were comprehensively reviewed,and the basis of the DOA estimation model and spatial spectrum estimation was comprehensively expounded.The overall analysis of multiple signal classification algorithms was premised on the classification of multiple signals.The algorithm program and the basic principle are proposed.Based on computer simulation experiments,the performance of multiple signal classification algorithms is analyzed.The MATLAB software was used to simulate the MUSIC algorithm.Through the simulation,it can be seen that the MUSIC algorithm has better performance and higher efficiency,and can provide high resolution and asymptotic unbiased arrival angle estimation.Research shows that with the MUSIC algorithm,the number of bursts,the number of snapshots,the higher the signal-to-noise ratio,the greater the signal input angle difference,the higher the resolution of the algorithm,when the array element spacing is not greater than the carrier half wavelength,The resolution of the MUSIC algorithm increases greatly with increasing spacing between array elements.However,when the array element spacing is greater than 1/2,the spatial spectrum appears false peaks in other directions except the signal source direction,and the signal-to-noise ratio is small.At small angular intervals,the estimated performance of the MUSIC algorithm is severely degraded.When the signals are coherent,the simulation finds that the classical MUSIC algorithm has lost its effectiveness,and the improved MUSIC algorithm can distinguish the coherent signals and effectively determine the direction of the wave.And the improved algorithm also improves the signal DOA estimation performance.Therefore,the research on DOA estimation proposed by the improved algorithm is very important both theoretically and practically.