摘要
针对复杂电磁环境下LFM脉压雷达移频干扰辨识的问题,提出了一种新的基于分数阶Fou-rier变换的干扰识别方法。该方法通过将分数阶Fourier变换与雷达接收机中的匹配滤波结果相结合,不仅可实现对接收信号的分数阶滤波,去除复杂电磁环境中的杂波噪声,进而提高脉冲压缩测距系统的准确度;并且将利用分数阶Fourier变换估计得到的目标速度信息与脉冲压缩所得距离信息相结合,可有效识别敌方干扰机发射的假目标欺骗干扰。仿真实验验证了方法的有效性。
To resolve the problem of detecting frequency-shifting jamming to LFM radar, a new method is put forward based on the fractional Fourier transform. By combining fractional Fourier transform with the result of matched filter which is a part of the radar receiver, the new detecting method can excise the clutter and noise in the complex electromagnetic environment and then improve the precision of the distance measur- ing system. What＇s more, the deceptive jamming can be detected effectively through joint usage of the speed information from fractional Fourier transform and distance information from pulse-compression. Simulation results verify that the new approach is valid.
出处
《雷达科学与技术》
2013年第2期192-196,共5页
Radar Science and Technology
基金
国防科技重点实验室基金(No.9140C1301031001)
高等学校博士学科点专项科研基金(No.20093201110005)
关键词
分数阶FOURIER变换
线性调频
脉冲压缩
移频干扰
fractional Fourier transform
linear frequency modulation
pulse-compression
frequency-shifting jamming
