Long towed line array is one of the most important modes of towed line array; the problem of port/starboard illegibility is one of the main disadvantages. Based on the near-field zone characters of long towed line array, the target function whose parameters are target' bearing and range was established according to the theory of time delay beam-forming. When the shape of long towed line array was linear, target function' grey-scale picture can be acquired through two dimensions search focusing on the parameters of bearing and range based on the frequency of target acquired through spectrum analysis. When the towed body turnes, the shape of long towed line array can be predicted based on the data of two course sensors which were installed at the bow and at the stern of the array. Then changing the target function, doing the two dimensions search and drawing the target function' grey-scale picture again, the target' bearing and illusive target' bearing can be discriminated according to the change of target function' grey -scale picture. Thus, a new method which can solve the problem of port/starboard discrimination of long towed line array was acquired. The simulation result shows that the changes of target function' grey-scale picture are obvious, and this method can solve the problem of port/starboard discrimination effectively.%长线阵声纳是拖曳线列阵声纳的一种重要形式,左右舷模糊问题是其主要缺点之一.针对长线阵声纳满足近场条件的特点,当长线阵声纳呈直线状态时,根据时域波束形成原理建立以目标方位和距离为自变量的目标函数.根据频谱分析后所得的目标频率,对方位和距离两个参量进行二维搜索,得到目标函数灰度图.当长线阵声纳所在拖体转向机动时,利用长线阵声纳首尾两航向传感器的数据对长线阵声纳的阵形进行预报,在此基础上改写目标函数,再次通过二维搜索得到目标函数灰度图,根据阵形弯曲前后目标函数灰度图的变化,可辨别出目标方位和虚源方位,从而得到一种新的左右舷分辨方法.仿真结果表明目标函数灰度图变化直观明了,所提方法可有效解决长线阵声纳左右舷分辨问题.
展开▼
