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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 FM signal (NFM) is good for anti-interference and distance-velocity joint resolution, and has been widely used in radar field. However, there are few researches on its application in active sonar field. To this end, the NFM is introduced into the sonar application, and its bandwidth characteristics and ambiguity functions are analyzed through simulation experiments. Monte Carlo experiments show that when the effective frequency modulation index m≥1, the bandwidth of NFM has nothing to do with the modulation noise bandwidth, and the power spectrum has a Gaussian shape. Simulation results of WAF show that the NFM ambiguity graph is pin-type, which overcomes the inherent distance-velocity coupling fuzzy defect of traditional linear frequency modulation (LFM) signals.