The equivalent ratio model of carrier power to noise density is optimized based on the principle of signal acquisition, carrieT tracking and data demodulation of global navigation satellite systems. The acquisition-spectrum separation coefficient of C/A code interference is raised for circumstances with Doppler frequency. The results show that the spectrum separation coefficient changes clearly with changes in the Doppler frequency spectrum. Analysis of simulation results verifies the validity of the model. This provides support for subsequent optimal design of a new generation of navigation signals.%根据全球卫星导航系统信号捕获、载波跟踪和数据解调的原理,优化了等效载波功率与噪声密度比模型.针对有多普勒频率时的情况,提出了C/A码自干扰时的捕获-频谱隔离系数.结果显示,随着多普勒频率的变化,频谱隔离系数有着明显的变化.通过对仿真结果的分析,验证了模型的有效性,也为后续卫星导航信号的优化设计提供了支持.
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