低轨导航功率增强信号兼容性分析

Compatibility analysis on low-orbit navigation power enhancement signals

为了弥补有关低轨导航功率增强信号的兼容性分析相关研究的不足,提出一种基于等效载噪比和谱分离系数的兼容性评估方法:该分析方法类比干扰信号评估方法,计算原信号的等效载噪比损耗和谱分离系数,信号等效载噪比损耗绝对值越大,谱分离系数越大,增强信号兼容性越差;并对不同调制方式的信号分别作兼容性评估,筛选适合低轨导航功率增强信号调制方式。实验结果表明,二相移相键控体制(BPSK)功率增强信号兼容性较差,可以采用二进制偏置载波(BOC)(6,4)信号作为低轨导航功率增强信号;等效载噪比损耗低,谱分离系数小。

In order to make up for the insufficiency of related study on the compatibility analysis of low-orbit navigation power enhancement signals,the papaer proposed a compatibility evaluation method based on equivalent carrier-to-noise ratio and spectral separation coefficient:analogous to the interference signal evaluation method,the equivalent carrier-to-noise ratio loss and spectral separation coefficient of the original signals were calculated by the analysis method,getting that the larger the absolute value of the signal equivalent carrier-to-noise ratio loss was,the greater the spectral separation coefficient was,and the worse the enhanced signal compatibility was;and compatibility evaluations were made for the signals of different modulation modes;then the modulation modes suitable for low Earth orbiting(LEO)navigation power enhancement signals were screened.Experimental result showed that the binary phase shift keying system(BPSK)power enhancement signals would have poor compatibility,and the binary offset carrier(BOC)(6,4)signals could be used as the low orbit navigation power enhancement signals;meanwhile,the equivalent carrier-to-noise ratio loss would be low,and the spectral separation factor would be small.