Research on Wideband Adaptive Sum and Difference Beamforming and Angle Measurement Method

In order to solve the problems of high SNR requirement and large amount of computation in wideband adaptive space-frequency processing, this paper proposes an wideband space-time adaptive sum difference beamforming and angle measurement method based on uniform linear array without pre delay processing. Methods that the multi constraint conditions are established by the response of sum beam pointing at multi frequency points, so as to obtain the adaptive and beam weight vectors based on the minimum variance of linear constraint. The space-time two-dimensional vector correction and beam weight vectors of multi frequency points are used to obtain the difference beam weight vectors. Finally, the sum difference beam forming is carried out, and the angle is measured for each sample and the difference amplitude single pulse. Compared with the conventional adaptive monopulse angle measurement method, this method can effectively process the wideband signal without detecting the signal in each frequency band. It has the characteristics of high angle measurement accuracy and angle measurement accuracy under the condition of low signal-to-noise ratio. Moreover, the simulation results show that this method is still effective when there is main lobe interference.