| 摘要: |
| 针对传统的雷达脉内信号调制类型识别方法存在的抗噪性能差和识别率低等问题，
提出了一种基于分数阶傅里叶变换（FRFT）的脉内信号调制方式识别算法。该算法分为两步
：首先根据不同调制方式在调频斜率上的区别，通过FRFT模值随阶数变化的特点，识别出线
性调频信号；然后，再根据阶数为1时FRFT的波形特点，识别出频率编码信号和相位编码信
号。仿真实验表明，该算法在信噪比优于-2 dB的情况下可以完成脉内信号的调制特征
识别，其抗噪性能和识别率均明显优于传统识别方法。 |
| 关键词: 雷达信号 脉内特征识别 调制方式 分数阶傅里叶变换 |
| DOI： |
|
| 基金项目: |
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| Recognition of Intra-pulse Signals Modulation Based on Fractional Fourier Transform |
| NING Hui,CHEN Chao |
| (Research Office of Special Equipment,Beijing Aeronautical Technology Research Center,Beijing 100076,China;Department of Aviation Electronic Engineering,Aviation University of Air Force,Changchun 130022,China) |
| Abstract: |
| A recognition algorithm for radar intra-pulse modulation is proposed based on
Fractional Fourier Transform(FRFT) to solve the problems of
poor anti-noise performance and low identify probability of the traditional reco
gnition method. The algorithm is divided into two steps: firstly, according to t
he difference on the modulations slope, linear frequency modulation signals(LFM
) can be recognized by the features of FRFT′s modular maximum which changes with
mutative step; and then, the others modulation, frequency code signals and phas
e code signals(PSK), can be recognized by the curve of FRFT, when the step is
1. Finally, the simulation result proves that the FRFT can realize the recogniti
on of intra-pulse modulation with the SNR exceeds -2 dB, and the anti-no
ise performance and identify probability of this algorithm are better than that of tradi
tional recognition method. |
| Key words: radar signal recognition of intra-pulse feature modulation mode fractional Fourier transform |
《电讯技术》编辑部 