论文部分内容阅读
传统声呐与现代声呐信号处理的主要差别在于对声道所做的假设不同。前者假设声道 的声速剖面是均匀的，后者假设声速剖面在水平面内是均匀的而在垂直面内是非均匀的。正是由 于对产速剖面所做的假设不同，使得我们可从六场中提取的信息也不同。传统的被动定位方法一 般可分为两类，一类是三角定位法，它利用波前弯曲来定位，使得其受基阵孔径的约束较大，因 此作用距离不可能太远；另一类是ＴＭＡ定位方法，这类方法均需较长时间的积累，甚至是本艇 机动，这些都是难以接受的。现代定位方法一般也可分为两类，一类是基于简正波的方法，另一 类是基于射线传播的方法．前者适用于低频，但为了获得足够的精度也需要大孔径：后者适用于 高频，因而无须大孔径，工程实现也较易。结合工程化的需求，我们选择了射线模型下的多路径 定位方法，利用相关课题研究的成果ＳＡＤＧ（合成基阵数据产生器）和ＧＨＳＰ（通用硬软件平台） 构成了一个实时多路径定位系统，并在莫干湖进行了湖试。湖试结果表明，声场的多路径信息应 予重视和利用，在声场比较稳定的情况下，利用直径为１ｍ的球壳阵可对远处目标进行较为准确 的定位。
The main difference between traditional sonar and modern sonar signal processing lies in the different assumptions made on the soundtrack. The former assumes that the sound velocity profile of the channel is uniform, while the latter assumes that the sound velocity profile is uniform in the horizontal plane and non-uniform in the vertical plane. It is because of the different assumptions made about the velocity profile that the information we can extract from the six fields is different. The traditional passive positioning methods can be generally divided into two categories, one is the triangular positioning method, which uses wavefront bending to locate, making its larger bound by the aperture of the array, so the role of the distance can not be too far; the other is TMA positioning methods, such methods require a longer period of accumulation, or even the motor boat, which are unacceptable. There are two types of modern localization methods: one is based on normalized wave and the other is based on ray propagation. The former is suitable for low frequencies, but a large aperture is required for sufficient accuracy: the latter for high frequencies, eliminating the need for large apertures and making engineering easier. Combined with the engineering requirements, we selected the multi-path location method under the ray model. Based on the results SADG (Synthetic Array Data Generator) and GHSP (General Hardware and Software Platform), we constructed a real-time multi-path location system, And Lake Mogan conducted a pilot. The results of the lake test show that multi-path information of the sound field should be valued and utilized. When the sound field is relatively stable, a spherical shell with a diameter of 1 m can be used to locate the distant target more accurately.