数字式主动声呐研制的初步探索

首先介绍数字式主动声呐的优点及实现上的特殊困难．采用时间相关积累信号处理方法，可以克服海洋背景噪声和船只自噪声的干扰，并具有强烈的抗起伏性能．在垂直向下探测或短距离、高频探测等特殊条件下，依混响的衰减规律，由微机组成精确的灵敏度时间控制网络，可以抑制混响的影响，并大大地简化了目标识别的难题．回声测深仪、垂直探鱼仪及本文介绍的浅海航行暗礁障碍探测仪的研制和海上实验，说明了这个结论．

Preliminary studies on digital active sonar

The digital active sonar has many advantages, but we have many problems to realize them. The use of temporal correlation can eliminate the interference caused by both the oceanic background noise and the ship's self-noise, and has perfect capability of anti-fluctuation. Under the special condition of vertical down detection or in short distance by high working frequency detection we can use high sensitive temporal control network formed by micro computer to suppress the influences caused by reverberation according to the attenuation rules of reverberation. The temporal control network is also useful to simplify the target-identification. The sonic depth detector, vertical fish detector, hidden-rock detector for shallow water sailing are discussed in this paper. The field experiments will prove the above argument.