参数化时频分析在连续波有源探测中的应用

Parameterized Time-frequency Analysis in Continuous-wave Active Detection

针对双曲调频信号在连续波有源探测中的目标回波检测和直达波干扰抑制问题,提出了基于参数化时频分析的连续波信号处理算法。首先,通过分析双曲调频连续波的信号时频特性,结合参数化时频分析思想,提出了适于有源探测的频域参数化时频变换和针对双曲调频信号的核函数设计。然后,为抑制接收信号中的直达波干扰,采用参数化旋转时频变换处理接收信号,并进行时频域滤波以分离信号分量,再利用反变换重构回波信号。数值仿真和海上实验结果表明,所提算法不仅能准确估计信号时频特征、有效获取双曲调频连续波信号的时频增益、提升检测性能,还可以有效抑制直达波干扰。

Acontinuous wave signal processing algorithm is proposed based on parameterized time-frequency analysis to address the problems of target echo detection and direct wave interference suppression of hyperbolic frequency modulation signal in continuous-wave active detection.First,based on the analysis of the time-frequency characteristics of the hyperbolic frequency modulated continuous wave signal andthe idea of parameterized time-frequency analysis,we propose afrequency-domain parameterized time-frequency transform suitable for active detection and the kernel function design for hyperbolic frequency modulated signal.Then,to suppress the direct wave interference in the received signal,the parameterized rotating time-frequency transform is used,along with the time-frequency domain filtering in order to separate the signal components,and then the echo signal is reconstructed via the inverse transform.Numerical simulation and marine experimental results show that the proposed algorithm not only can accurately estimate the time-frequency characteristics of the signal,effectively obtain the time-frequency gain of the hyperbolic frequency modulated continuous wave signal,and improve the detection performance,but also can effectively suppress direct wave interference.