基于希尔伯特变换的数字波束合成算法

Abstract

为了降低多普勒计程仪波束合成器的复杂度，本文根据相移束控基本原理和希尔伯特变换性质，提出一种基于希尔伯特变换的基带数字波束合成算法。首先，利用希尔伯特变换实现正交解调和相移束控技术中的π/2相移；然后，利用希尔伯特变换性质，由解调得到的基带复信号的实部和虚部的线性组合实现在所需方向的波束合成。计算机仿真验证了本文算法的有效性，波束合成器的复杂度被大大降低。 In order to reduce the complexity of Doppler Velocity Log’s beamformer, according to the basic principle of the phase shift beamforming and the Hilbert transform properties, a digital beamforming method based on Hilbert transform is proposed. Firstly, the quadrature demodulating and the π/2 phase shift of the beamforming technology are implemented by using Hilbert transform. Then, using the Hilbert transform properties, the real and imaginary parts of the demodulated complex signal are combined linearly to form a beam with a particular direction. Computer simulation results show the effectiveness of the proposed method, and the complexity of the beamformer is greatly reduced.