强背景噪声环境下的线性调频信号检测

LFM Signal Detection in High Noise Circumstance

基于线性调频 (LFM )信号Wigner Ville变换的零频处仍保存原信号所有信息的结论 ,提出了改进的基于互Wigner Ville分布线性调频信号的检测方法。该方法具有较好的抗噪声能力 ,在更低的信噪比下 ,可以实现单个或多个强度相差较大的线性调频信号的检测。

An improved algorithm based on cross Wigner-Ville distribution,which is derived for the special case where the frequency is zero in Wigner-Ville distribution (WVD) of time-frequency analysis is used to detect LFM signal, in this case the WVD includes all the information of original signals, such as frequency and phase. This method is efficient for reducing noise, for single LFM signal or small target embedded in some large targets they can be detected in low SNR by the algorithm. The simulation results prove its effectivity.