基于混沌调制技术的卫星隐蔽通信性能分析

Performance Analysis of Satellite Covert Communication Based on Chaotic Modulation

针对利用传统DS扩频技术实现的卫星隐蔽通信易被截获的情况,利用混沌信号的特性,提出了一种基于相干混沌移位键控信号的卫星隐蔽通信方案。采用离散基带模型阐述了系统原理并分析了其隐蔽性能、抗干扰性能,然后通过建立基于混沌调制技术的卫星隐蔽通信仿真模型进行性能仿真。仿真结果表明,使用相干混沌移位键控信号完成卫星隐蔽通信同样可以具有较好的隐蔽性和抗干扰性,方案的提出对基于混沌调制技术的卫星隐蔽通信提供了理论支持。

In view of the fact that the satellite covert communication with direct sequence spectrum spreading （DSSS） is easy to be intercepted, a scheme of satellite covert communication with the coherent chaos shift keying signal is proposed based on the characteristic of chaotic signal. The principle of this system is formulated and the performance of invisibility and jam resistance are analyzed through discrete baseband model. Then the simulation models of satellite covert communication system based on chaotic modulation are installed. The results of simulation show that the system with coherent CSK signal has good performance of invisibility and jam resistance and provides a theoretical support for satellite covert communication based on chaotic modulation.