中文摘要：

线性调频信号（LMFs）是雷达回波信号的一种常见形式，Wigner—Hough变换（wHT）常用于LMFS的检测。复杂环境下雷达回波中的尖峰脉冲噪声服从α稳定分布，在这种噪声环境下WHT性能退化。基于此提出了能工作在稳定分布噪声环境下的分数低阶伪Wigner—Ville时频分布方法（FLO—PWVD），结合已有的Hough变换，提出了分数低阶伪Wigner-Hough变换（FLO—PWHT）新方法。在脉冲噪声环境下，应用FLO—PWHT对多个LMFS信号进行检测，计算机仿真结果表明，提出的FLO-PWHT算法性能明显优于已有的PWHT方法，能较好地在脉冲噪声环境下工作，且具有一定的韧性。

英文摘要：

The linear frequency-modulation signal （LMFS） is a common form of radar echo signal, and the Wigner-Hough transform （WHT） is commonly used to detect the LMFS. The spike impulse noise in radar echo follows α stable distribution in complex environment, but the performance of the WHT will degenerate in this noise environment. The fractional lower-order pseudo Wigner-Ville time-frequency distribution （FLO-PWVD） method is proposed in this paper, which can work in stable dis- tribution noise environment. The new method of fractional lower-order pseudo Wigner-Hough transform （FLO-PWHT） is pro- posed based on Hough transform. The FLO-PWHT method was adopted to detect the multiple LMFSs in impulse noise environ- ment. The computer simulation results show that the proposed FLO-PWHT method has better performance than the existing PWHT method, it can work better in the impulse noise environment, and has a certain tenacity.