基于拉东变换的对空无线电引信目标检测

摘要

Aiming at the problem of poor performance when the short time Fourier transform ridge is used to detect the target at low SNR,a small target detection method for air radio fuze based on Radon transform was proposed.In this method,the two dimensional time-frequency distribution matrix of the target signal was trans-formed by short time Fourier transform,and the energy of the continuous target signal was accumulated to im-prove the discrimination between the target signal and the noise.The simulation results showed that the per-formance of the target signal based on Radon transform was better than that based on the short time Fourier transform for the low SNR.%针对对空无线电引信在低信噪比情况下采用短时傅里叶变换脊线进行目标检测时性能较差的问题,提出了基于拉东(Radon)变换的对空无线电引信小目标检测方法.该方法通过拉东变换处理目标信号经短时傅里叶变换得到的二维时频分布矩阵,将连续的目标信号轨迹能量进行累积,提高目标信号与噪声的区分度.仿真表明,低信噪比情形下,基于拉东变换检测目标信号的性能优于基于短时傅里叶变换的性能.