摘要
噪声调频信号(NFM)有利于抗干扰和距离-速度联合分辨,在雷达领域已经得到广泛的应用,但是在主动声纳领域的应用相关研究较少。为此,将NFM引入到声纳应用中,通过仿真实验分析了其带宽特性和模糊函数。蒙特卡洛实验表明:有效调频指数m≥1时,NFM的带宽与调制噪声带宽无关,且功率谱呈高斯形状。宽带模糊函数(WAF)的仿真对比表明:NFM的模糊度图呈图钉型,克服了传统线性调频(LFM)信号所固有的距离-速度耦合模糊缺陷。
Noise frequency modulation signal （NFM） which is suitable for anti-interference and com- bined distance-velocity resolution has been widely applied in radar, but has seldom been investigated in the field of active sonar. Thus, NFM is introduced to sonar application. Its bandwidth and ambiguity function are analyzed through simulation experiments. Monte Carlo experiments show that if efficient- frequency-modulation-index m≥1, NFM＇s bandwidth is independent of the bandwidth of modulating noise with its power spectrum in the Gaussian shape. The results of simulating and comparing wide- band ambiguity function （WAF） show that NFM＇s ambiguity map is of thumbtack style, overcoming the coupling distance-velocity ambiguity inherent in LFM signal.
出处
《海军工程大学学报》
CAS
北大核心
2012年第5期18-20,47,共4页
Journal of Naval University of Engineering
基金
国家自然科学基金资助项目(50909096)
水下测控技术重点实验室资助项目
关键词
主动声纳
噪声调频信号
宽带模糊函数
active sonar
noise frequency modulation signal
wide-band ambiguity function
