中文摘要：

随着降噪消声技术的发展，如何有效被动检测低噪声目标，成为声纳研发者面临的主要问题之一。本文基于频谱感知、多频带联合检测及信息融合技术，提出了具有环境噪声利用和背景噪声抑制功能的多频带联合包络调制谱检测技术。此技术侧重基频调制谱检测，将可用带宽分为多个子频带，动态感知子频带内强频谱区域，将其峰值频率作为解调载波频率。并通过降采样和时间积累，提高调制谱频率分辨率和信噪比，通过联合检测和信息融合，提高调制谱检测率。仿真和海试数据分析验证了方法的有效性。此方法具有一定的应用价值和实际意义，将来还需要对方法理论和机理进行深入研究。

英文摘要：

With the progress of noise reduction and insulation technology, it is difficult to efficiently detect the underwater target that radiates low noise passively. And this is one of the vital questions for the sonar researchers. A technique of muhiband joint detection of envelope modulation spectrum based on spectrum sensing, mutiband joint detection and information fusion was presented in this paper. It has the capabilities of environment noise utilization and background noise suppression. This algorithm emphasizes the detection of the base frequency spectrum and divides the available bandwidth into multiple frequency segments. It senses the spectrum to get the frequency of peak value and uses the frequency as the carrier frequency of demodulation. With the techniques of down sampling, time accumulation, multiband joint detection and information fusion, it not only improves the frequency resolution of the spectrum, but also increases the probability of detection of envelope modulation spectrum. The simulated results with real sonar data validate the superiority of the proposed method. Future research will focus on the theory and mechanism of the technology for the important value of practical application.