雷达辐射源信号的多重分形特性研究

Multifractal Feature of Radar Emitter Signal

分形维数可以描述信号的复杂程度,但是单个分形维数描述信号是不够的,故对不同调制雷达辐射源信号的多重分形特性进行研究。通过仿真六种常见脉内调制雷达辐射源信号,并计算它们在不同情况下的多重分形广义维数,结果发现多重分形广义维数对噪声不敏感,同时,同一种调制方式下调制参数对广义维数的影响也不大。因此,多重分形广义维数可以作为雷达辐射源信号脉内调制方式识别的分类特征。

Fractal dimension can describe the complexity of radar emitter signal, but single fractal dimension isn＇t enough to describe signal, so the multifractal feature of radar emitter signal with different modulation is studied. Through simulating six ordinary intrapulse modulations radar emitter signal and computing their multifractal generalized dimension under different condition, the results indicate that muhifractal generalized dimension is insensitive to noise, and for same modulation mode modulation parameter has little influence on generalized dimension. Therefore, multifractal generalized dimension can be as the classification feature for the intrapulse modulation recognition of radar emitter signal.