REAL-TIME FREQUENCY AND 2D ANGLE ESTIMATION OF WIDE FREQUENCY BAND SIGNALS WITH UNIFORM CIRCULAR ARRAYS
用均匀圆阵实现宽频段来波信号频率和二维角估计

A method is presented for real-time estimation of the frequency, azimuth and elevation angles of the signal incident on uniform circular arrays(UCA) over a very wide frequency band(1~18GHz) in DFT beamspace. The method provides unambiguous frequency estimation under temporal undersampling and unambiguous azimuth and elevation estimation using integer search algorithm under spatial undersampling. The estimations of azimuth and elevation angles are automatically paired with corresponding frequency estimates. The variance of the frequency estimates of indirect method is 2~3 magnitudes less than that of the direct method. Simulations are presented demonstrating the capabilities of the method.