导航信号副载波调制频谱仿真平台设计

摘要

在导航信号中，副载波调制用于实现谱分离和更优的导航性能。目前的副载波调制形式主要有二进制偏移载波BOC、混合二进制偏移载波MBOC、交替二进制偏移载波AhBOC和二进制编码序列BCS等。在导航信号设计中，需要针对不同的副载波调制参数下的频谱特性进行仿真和对比，设计了一种基于GUI的副载波调制信号的频谱仿真平台，能够方便进行功率波形、自相关和谱分离系数（SSC）的参数仿真和对比。%Spectrum split can be realized by using sub-carrier modulation which offers improved performance for navigation sig- nals. Some modulation methods are discussed, including binary offset carrier （BOC）, multiplexed binary offset carrier （ MBOC ）, alter- native binary offset carrier （ALTBOC） and binary coded symbol （BCS）, etc. In the design of navigation signal, simulation and compari- son of spectrum characteristics under different modulation parameters are necessary. A software platform is realized for sub carrier modu- lation signal spectrum simulation based on graphic user interface （ GUI）. The platform simplifies the simulation and comparison of spec- trum curve,autocorrelation properties and spectrum split coefficient （SSC）.