水下无载波窄脉冲相关特征检测

Correlation Characteristic Detection of Underwater Carrier-free Pulse

广泛应用于超宽带雷达的无载波窄脉冲信号具有较高的距离和角度分辨率、超近程探测能力、便于目标识别、抑制混响起伏等独特优势。现将其应用于水下声纳系统,水下窄脉冲信号具有宽低频特性,从相关方法出发,讨论无载频窄脉冲对体目标信号的检测。根据窄脉冲信号脉宽内相关特征不变特性,体目标信号经过相关器和特征判决器,可明显减小虚峰出现的概率。数值模拟和实验均验证并证明单次检测即可检测到目标信号,精确检测峰值出现时间。

Short pulse widely used for UWB radar has capability of high range and angle resolution,short-range detection,target recognition,depression of reverberation.For the matter,it is brought into sonar system.With the characteristic of widely low frequency component,carrier-free pulse is employed for detecting body target.Based on invariance characteristic of correlation peak width,zero-crossings and peaks distribution,body target echo goes through correlation cell and judge cell,Through them,fake peaks apparently decrease and echo peak time is obvious and precious for single detection.