基于Radon变换的速变谱提取算法

多普勒频移随时间快速变化这一信息在水听器探测空中高速目标时具有重要意义,提出了速变谱的概念,并提出应用Radon变换在信号的LOFAR图中捕捉速变谱信息;针对速变谱曲线可能是任意曲线而Radon变换只能对直线等已知参数方程的曲线进行提取的问题,提出分块Radon变换的方法。仿真与海试数据分析均表明,该方法可以在较低信噪比情况下检测到速变谱信息。

Research on radon transform-based algorithm for extraction of fast changing spectrum

For the great importance of the information of Doppler frequency shift quickly changing with time in ex- ploring high speed aerial targets, the concept of fast changing spectrum is put forward, and the Radon transform is used to catch the information of the fast changing spectrum in the lofargram. Owning to the fact that the special fast changing line may be an arbitrary curve and the Radon transform can only pick out the parameters of the curve with a known equation like a straight line, the method of divisional Radon transform is presented. Experimental results show that this method can explore the existence of the special fast changing lines under low signal to noise ratio.