随着安全通信要求的提高，卫星通信信号的隐蔽性备受关注。提出了一种基于Arnold变换的抗截获波形设计方法，采用图像领域中的Arnold变换，将扩频信号在频域进行置乱后发送，使得置乱后的信号在时域上不具备扩频信号的周期特性，在频域上更具有随机特性，提高信号传输的安全性。经Arnold变换后的信号采用时延相关法进行检测，不能检测出明显的相关峰。根据时延相关的结果，采用峰均比(Peak-to-Average Power Ratio，PAPR)检测，分析置乱信号的检测概率。与传统扩频信号相比，设计的信号波形在相同信噪比和检测门限条件下，具有更低的检测概率，抗截获性能更好。经过仿真验证可知，接收端根据Arnold反变换，恢复出包含有重要信息的原始信号，并且经过Arnold变化后的信号几乎不会造成误码率的波动和提升。
Design Method of Anti-interception Waveform Based on Arnold Transform
With increasing demand of security communication,study on the concealment of satellite communication signals has attracted much attention.In this paper,an anti-interception waveform design method based on Arnold transform is proposed.Different from traditional spread spectrum signal,this method uses Arnold transform to send spread spectrum signal after scrambling in frequency domain,so that the scrambled signal does not have periodic characteristics of the spread spectrum signal in time domain,but has more random characteristics in frequency domain,so as to improve the security of signal transmission.The signal transformed by Arnold is detected by time-delay correlation method,but no obvious correlation peak can be detected.According to delay correlation results,the detection probability of scrambled signal is analyzed using Peak-to-A verage Power Ratio(PARR)detection.Compared with traditional spread spectrum signal,the signal waveform designed in this paper has lower detection probability and better anti-interception perform-ance under the same SNR and detection threshold conditions.Through simulation verification,it can be seen that the receiver recovers the original signal containing important information according to Arnold inverse transformation,and the signal after Arnold change will hardly cause fluctuation and degradation of bit error rate.
万方数据
维普
