给出了一种基于优化循环码移键控(cyclic code shift keying,CCSK)方式的通信导航一体化信号设计方法,使通信信号的互相关函数的正值与导航信号自相关函数的峰值一致,从而克服互相关干扰,提高通信速率.通过频分复用的方式划分通信信号和导航信号的频带,基于正交频分复用(orthogonal frequency di-vision multiplexing,OFDM)技术提出连续分配、交替分配和随机分配3种子载波分配方案.对优化CCSK调制和CCSK调制的一体化信号的自相关峰值性能进行仿真和分析,结果表明,在3种子载波分配方案下,采用优化CCSK调制的一体化信号的自相关峰值性能均优于CCSK调制的一体化信号,且采用优化CCSK调制的通信信号的互相关特性对相应的导航信号的自相关峰值有增强作用,可提升通信导航一体化信号体制下导航信号的码相位同步性能.
A signal design method for LEO satellite communication and navigation integration based on optimized CCSK modulation
A signal design method was proposed for communication and navigation integration,utilizing optimized cy-clic code shift keying(CCSK)as communication spread spectrum modulation.The positive value of the cross-correlation function of the communication signal aligns with the peak value of the autocorrelation function of the navi-gation signal to overcome the cross-correlation interference and enhence the communication rate.The frequency bands of communication signal and navigation signal were divided by frequency division multiplexing.Based on or-thogonal frequency division multiplexing(OFDM),three sub-carrier distribution schemes of continuous allocation,al-ternating allocation and random allocation were proposed.Simulation and analysis of the autocorrelation peak perfor-mance of integrated signal with optimized CCSK and CCSK modulation were conducted.The results demonstrate that under three subcarrier allocation schemes,the autocorrelation peak performance of the integrated signal employing optimized CCSK modulation surpasses that using only CCSK modulation.And the cross-correlation characteristic of communication signal modulated by optimized CCSK will enhance the autocorrelation peak value of the correspond-ing navigation signal,and improve the code phase synchronization performance of navigation signal under the inte-grated signal system.
communication and navigation integrationorthogonal frequency division multiplexingcyclic code shift keyingsignal design
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