基于WFRFT的卫星信号掩盖方法研究  

Research on Satellite Concealment Communication Method Based on WFRFT

作　　者：桑之昂 刘亚南 刘子威[1] 胡义鑫 张更新 SANG Zhiang;LIU Ya’nan;LIU Ziwei;HU Yixin;ZHANG Gengxin(College of Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China;China Research Institute of Radio Wave Propagation,Qingdao 266107,China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]哈尔滨工程大学信息与通信工程学院,哈尔滨150001 [3]中国电波传播研究所,青岛266107

出　　处：《电子与信息学报》2022年第1期339-345,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61801445)。

摘　　要：卫星信号掩盖技术利用具有强功率、特定参数特征的信号来掩盖信道中的通信信号,以达到保护信号波形安全的目的。但随着调制识别和串行干扰消除(SIC)技术的发展,采用常规调制方式的掩盖信号能够被非合作接收方破解。针对便携式卫星通信终端的安全通信需求,该文借鉴卫星成对载波多址(PCMA)中利用本地信号副本进行自干扰抵消的思想,分析了一种适用于便携式终端的卫星安全通信方法。同时引入加权类分数傅里叶变换(WFRFT)作为掩盖信号的调制方式,以增加非合作方识别与解调掩盖信号的难度。仿真表明该文所提方法提高了信号传输的安全性,且经过信号分离后系统的误码率损失在可接受范围内,适合实际使用。Satellite signal concealment technology protects the safety of signal waveform by using signals with high power and specific parameter characteristics.However,with the development of modulation recognition and Successive Interference Cancellation(SIC)technology,the cover signal using conventional modulation methods can be cracked by non-cooperative receivers.In order to meet the safety communication requirements of portable satellite communication terminals,the idea of using local signal copies for self-interference cancellation in Paired Carrier Multiple Access(PCMA)is used for reference.This paper proposes a satellite secure communication method suitable for portable terminals,and introduces Weighted-type FRactional Fourier Transform(WFRFT)as a modulation method to mask the signal,thereby increase the difficulty of non-cooperative parties in identifying and demodulating the cover signal.Simulation shows that the method proposed in this paper improves the security of signal transmission,and the loss of the system's bit error rate is within an acceptable range after signal separation,which is suitable for practical use.

关 键 词：加权类分数傅里叶变换 参数估计 信号分离 卫星重叠通信 

分 类 号：TN927.2[电子电信—通信与信息系统]