应用改进的线性预测算法构建虚拟阵的精确定向方法

Precise bearing method of building virtual array with the improved linear prediction algorithm

为了克服传统线性预测(Linear Prediction,LP)算法在构建虚拟阵过程中存在预测误差容易累积的弊端,提出了一种能够更充分利用实阵信息量的改进LP算法来构建虚拟阵。采用实际基阵方法、传统LP虚拟阵方法和改进LP虚拟阵方法分别对假定基阵的波束性能进行计算机仿真及对湖试数据进行处理成像,研究结果表明,与传统LP方法相比,改进的LP方法能够有效地抑制波束旁瓣,进一步提高了基阵的角度分辨力和阵增益,将其运用于特定试验背景下的实际湖底目标声探测,方向分辨精度可提高75%。

In order to overcome the disadvantages of the traditional LP（ Linear Prediction） algorithm that brought the cumulation of prediction errors in the process of building a virtual array,a kind of improved LP algorithm was proposed,with which we could make full use of the information of the real array in the virtual array building. Respectively through the actual array method,the traditional LP virtual array method and the improved LP virtual array method,the beam performance of assumed array was simulated and the data from lake trial was dealt with to form the imaging of echo highlights. Result shows that the improved LP method is more effective than the traditional LP method in suppressing the side- lobe of wave beams,and further improves the angle resolution and array gain. And when the improved LP method is applied to practical engineering for bottom target detection under specific experimental background,the directional resolution accuracy can be increased by 75%.