摘要:
传统的三元组拖线阵在分辨目标左右舷时利用左、右两侧的宽带能量之比,该技术在通常情况下能够较好地完成使命,但在实际应用中可能会遇到一些困难。本文针对两种影响其左右舷分辨结果的情况做了分析:一种是弱信噪比情况,另一种是另一舷侧存在强干扰目标的情况。针对这两种情况,通过对左、右舷频谱特征的分析,提出了利用线谱特征提取结果分辨目标左、右舷的新技术,显著降低了左右舷分辨功能对输入信噪比的要求。仿真和对海上实验数据的处理结果验证了该方法的稳健性和有效性,可望应用于工程实践中。为了使该技术能够适用于更低的信噪比条件,本文还提出了一种简单实用的线谱增强技术。
Abstract:
The energy's ratio of broadband is utilized for port/starboard discrimination in towed line array with hydrophone triplets in tradition.It can satisfy the need in most conditions except for two cases:One is low signal to noise ratio(SNR),and the other is that there is a stronger interfering target lied on the other side of the line array with approximate bearing.A new method called line-spectrum character extracting is proposed to discriminate port/starboard for these two cases in this paper,and the SNR needed for port/starboard discrimination is reduced sharply.Simulation and the sea-trial data are analyzed to show that the method is stable and valid,and it's expected to have application in practical towed line array sonar.A line-spectrum enhancing technology with lower calculation complexity and stable validity is proposed to ensure its application in lower SNR.
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