MAP-WFRFT卫星信号星座隐蔽特性研究  

A study of the covered characteristics of MAP-WFRFT satellite signals

作　　者：张喆[1] 达新宇[1] 刘慧军[1] 

机构地区：[1]空军工程大学,西安710077

出　　处：《重庆邮电大学学报（自然科学版）》2017年第4期460-467,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61571460)~~

摘　　要：针对卫星通信信号隐蔽性不足的问题,提出了一种基于多可变参数加权类分数阶傅立叶变换(muti-alterable parameter weighted fractional Fourier transform,MAP-WFRFT)的卫星隐蔽通信系统。新系统在传统调制方式基础上,利用MAP-WFRFT对卫星信号进行处理,使信号星座图分布发生旋转与发散,伪装成噪声或其他调制方式,从而实现信号的隐蔽。仿真结果表明,经过MAP-WFRFT处理后的卫星信号,通过改变加权项数M、变换阶数α、尺度向量V可以使信号星座图发生明显不同的旋转与发散。当3个参数满足文中推导的关系时,可以将QPSK信号伪装成16QAM信号。仿真分析误码率(bit error rate,BER)随M的变化规律,得到M值的增大会导致系统误码性能的下降。; In order to solve the problem of insufficient concealment of satellite communication signals, a satellite covert communication system based on multi-alterable parameters weighted fractional Fourier transform （ MAP-WFRFT） is pro-posed. The new system uses MAP-WFRFT to process satellite signals based on the traditional modulation method, rotates and diverges the distribution of the signal constellation, and simulates noises or other modulated ones. So the signals have been covered. The results of simulation show that satellite signal processed by MAP-WFRFT makes the signal constellation change and diverge obviously by changing the number of weighted terms M, the order of WFRFT a, and the scale vector V. When such parameters meet the relationship in this paper, the QPSK signal can be disguised as 16QAM signal. Simulation and analysis of bit error rate（BER） regularly changing with variational M show that the increase of the M will lead to the decrease of the BER performance.

关 键 词：卫星隐蔽通信 加权类分数阶傅立叶变换(WFRFT) 星座图 隐蔽特性 

分 类 号：TN914.42[电子电信—通信与信息系统]