Coherent Source DOA Estimation Based on a Single Snapshot of the Uniform Circular Array
|School||Nanjing University of Posts and Telecommunications|
|Course||Electromagnetic Field and Microwave Technology|
|Keywords||Uniform circular array Uniform circular array rotation invariant subspace algorithms Uniform circular array to finding roots Multiple signal classification algorithm Coherent Source Single Snapshot|
Spatial spectrum estimation algorithm is a method used to estimate the spatial signal reaches the receiver array to wave direction (DOA) DOA estimation of the array signal processing field an extremely important application . Need to estimate the direction of arrival of the signal are in the process of radar , sonar , wireless communications and signal processing . On the basis of the model of uniform circular array (UCA) signal reception , combined with uniform circular array rotation invariant subspace (UCA-ESPRIT) algorithm and uniform circular array root finding multiple signal classification (UCA-ROOT-MUSIC) algorithm , on the single uniform circular array snapshots coherent source DOA estimation algorithm exploratory research . First , the use of phase mode excitation array element space uniform circular array (UCA) conversion the pattern space uniform linear array , that is a virtual uniform linear array ( VULA ) . Next, the data vector obtained by the virtual linear array (VULA) Hermitian Toeplitz matrix reconstruction , after reconstitution of the matrix is used to restore the dimension of the signal space and noise space addition to the source correlation . Finally, the use of TLS-ESPRIT algorithm or ROOT-MUSIC algorithm to separate the signal space and noise space , thus correctly estimate the direction of arrival of the signal . The the article proposed algorithm does not require against $ subarray division does not need subarray covariance matrix before / after to smooth space , thus reducing the computational complexity . Simulation results prove that the article mentioned algorithms and use the 100 snapshots traditional spatial smoothing class algorithm similar performance , but the article mentioned algorithm uses only a snapshot algorithm to calculate the amount is very small .