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卫星通信抗截获信号波形设计
谢岸宏,朱立东,翟继强,李雄飞
0
(电子科技大学 通信抗干扰技术国家级重点实验室,成都 611731;中国空间技术研究院西安分院,西安 710100)
摘要:
针对卫星通信信号传输隐蔽性不高的问题,提出了一种抗截获的信号波形设计方法。采用具有循环平稳特性的大信号掩盖不具有循环平稳特性的弱信号,含有重要信息的弱信号成为大信号的背景信号,实现卫星信号的隐蔽传输。弱信号包含正常业务数据和重要数据,利用随机跳码扩频和随机跳时将两者合并的同时,可将重要数据隐藏于弱信号中,并破坏弱信号的循环平稳特性,提高重要数据传输的安全性。对信号波形仿真分析,在大信号和弱信号的功率比高于7 dB时,盲检测不到弱信号的存在,表明设计波形具有抗截获性。最后对弱信号解调性能仿真分析,表明抗截获能力提高的同时,其传输性能仍在可接受范围内。
关键词:  卫星通信  抗截获  波形设计  大信号掩盖
DOI:
基金项目:通信网信息传输与分发技术重点实验室开放课题(KX172600032); 中国航天科技五院CAST创新基金重点项目;装备预研领域基金(61405180503)
Waveform design for satellite communication signals with anti-interception capability
XIE Anhong,ZHU Lidong,ZHAI Jiqiang,LI Xiongfei
()
Abstract:
Aiming at the problem of low concealment of satellite communication signal,this paper proposes an anti-interception signal waveform design method.Strong signal with cyclostationarity is used to mask weak signal without cyclostationary characteristic.The weak signal with important information becomes the background signal of the strong signal.In this way,anti-interception satellite communication comes true.Weak signal contains normal service data and important data.The two signals are merged by using random jump code and random jump at the same time,important data can be hidden in the weak signal,and the weak signal cyclical characteristics is destroyed to improve the security of important data transmission.Signal waveform is simulated.When power ratio of strong signal to weak signal is higher than 7 dB,weak signal can not be detected.Simulation shows that the design waveform has anti-interception capability.Finally,the simulation analysis of the weak signal demodulation performance illustrates that the anti-interception ability is improved while the transmission performance is still within the acceptable range.
Key words:  satellites communication  anti-interception  waveform design  strong signal masking
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