一种基于分数阶傅里叶变换的LPI雷达检测方法

Method for LPI Radar Signal Detection Based on Factional Fourier Transform

为实现检测和精确提取LPI(Low probability of intercepting)雷达中脉冲压缩(PC)雷达信号的参数,文章提出基于数字信道化的接收机,采用频域子带分数阶傅里叶变换聚焦、滤波处理方法,以增强雷达信号检测与去噪能力,实现对雷达弱信号的检测和参数提取。文中给出了数字信道化接收机结构和分数阶傅里叶滤波步骤,仿真及性能分析。

In the phased-array radar of new system, the technologies such as ultra-low assistant lobe, low peakvalue power, complex wave designs are used to achieve low probability of intercepting. In order to detect and get the parameters of PC radar signals in LPI radar accurately, focusing and filtering methods with frequency-domain child-band factional Fourier transform are used based on digital channeled receivers, that can enhance the detecting and removing noise abilities of radar signals, achieve detecting radar weak signal and obtaining the parameters. The configuration of digital channeled receivers, the steps of factional Fourier filtering, emulation and performance analyzing are introduced in this paper.