基于加权高阶累积量切片的非线性调频信号增强算法

An Algorithm for Nonlinear Frequency-Modulated Signal Enhancement Based on Weighted Higher-Order Cumulant Slice

为了综合考虑高阶累积量各种切片抑制高斯噪声的性能,定义了加权高阶累积量切片,并给出了加权高阶累积量切片符号联合迭代公式,得到了基于加权高阶累积量切片的自适应谱线增强新算法。对该算法增强水下目标辐射的非线性调频信号的效果进行了仿真研究。仿真结果表明:该算法能抑制大约18dB～28dB的高斯色噪声;调整高阶累积量切片的加权系数,可获得抑制高斯色噪声的最佳效果。在工程实践中,具有重要的指导意义和实用价值。

For effectively suppressing colored Gaussian noise and enhancing nonlinear frequency-modulated signal, a new adaptive algorithm has been successfully developed. In this method, firstly, weighted higher-order cumulant slice is defined and the leakage iterative algorithm and the signed iterative algorithm as well as input signal are employed to update it. Secondly, an adaptive line enhancement algorithm based on the weighted higher-order cumulant slice is proposed. Finally, simulation with the underwater target-radiated nonlinear frequency-modulated signal is included. The simulation results show that the proposed algorithm can suppress colored Gaussian noise by about 18dB ~ 28dB and the performance of the proposed algorithm may be improved by adjusting the weighted coefficients of the higher-order cumulant slice.