逆波束形成的旁瓣抑制

为了降低普通逆波束形成旁瓣,提出了一种新的旁瓣抵消技术。该技术利用指向性函数中的旁瓣部分去估计声场的响应,然后从基阵估计的声场减去这部分指向性函数旁瓣估计的声场,从而得到最终的声场估计。由于较多的旁瓣响应被估计的声场扣除,最终估计的声场中的旁瓣大大降低。利用该技术可有效地抑制干扰,同时又可保持普通逆波束形成的方位高分辨力。湖试结果显示了该技术的有效性和可行性。

Sidelobe controling of the inverse beamforming

In order to reduce the sidelobe level of the conventional beamforming,a new sidelobe controling technology is presented.It uses the sidelobes of the direction function to estimate the respond of the acoustic intensity,which is then subtracted from the acoustic intensity estimated by array,to get the finial acoustic intensity.The sidelobes so estimated are reduced greatly because more sidelobes are subtracted.The technology can restrain effectively the interference,while retain the high-resolution of the conventional inverse beamforming.The results of a lake trial show the effectiveness and feasibility of the technology.