| 摘要: |
| 为提高卫星通信信号的射频隐身能力，提出了一种基于三层加权分数阶傅里叶变换(Weighted Fractional Fourier Transform,WFRFT)的安全通信系统。该系统将传统WFRFT扩展到三层，非合作方在未知调制层数的情况下无法正确分层解调，调制参数由9个增加到27个，增加了非合作方参数扫描的难度，提高了系统的保密性能。三层WFRFT调制系统选定目标信号作为优化目标，将星座图的裂变构型、裂变样式、模糊程度及旋转角度作为信号模拟的关键参数，建立优化模型并引入遗传算法进行迭代计算，得到最优控制参数，从而达到目标调制特征模拟的效果。星座图仿真和通信性能仿真结果验证了系统的有效性和可靠性。 |
| 关键词: 卫星通信 射频隐身 变换域通信 三层加权分数傅里叶变换 遗传算法 |
| DOI： |
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| 基金项目: |
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| A safe communication system based on three-layer weighted fractional Fourier transform |
| GAO Ping,YANG Yuxiao |
| (College of Astronautics,Nanjing University of Aeronautics and Astronautics) |
| Abstract: |
| To improve the radio frequency(RF) stealth capability of satellite communication signal,a secure communication system based on three layer weighted fractional Fourier transform(WFRFT) is proposed.The system extends the conventional WFRFT to three layers,the non partners cannot correctly perform layer demodulation without the number of modulated layers,and the number of modulation parameters is increased from 9 to 27,so the difficulty of non cooperative parameter scanning is enhanced,thus improving the confidentiality performance of the system.The three layer WFRFT modulation system selects the target signal as the optimization target,takes the fission configuration,fission style,blur degree and rotation angle of the constellation diagram as the key parameters of the signal simulation,establishes the optimization model and introduces the genetic algorithm for iterative calculation to obtain the optimal control parameters,so as to achieve the effect of the target modulation feature simulation.The simulation results of both the constellation diagram and communication performance prove the effectiveness and the reliability of three layer WFRFT system. |
| Key words: satellite communication RF stealth transform domain communication three layer weighted fractional Fourier transform genetic algorithm |
《电讯技术》编辑部 