卫星导航系统功率增强对接收信号质量的影响分析  

Effects of Enhancing Power on Received Signal Quality in Satellite Navigation System

作　　者：吕志成[1] 聂俊伟[1] 刘增军[1] 王飞雪[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《空间科学学报》2013年第1期101-107,共7页Chinese Journal of Space Science

摘　　要：GPS现代化计划在L1和L2两个频点上增加具有点波束增强功能的M码导航信号.以GPS L1 M码信号为例,从频谱重叠、接收信号等效载噪比两方面分析GPS L1 M码信号功率增强对其他导航信号质量的影响.分析结果表明,GPS L1 M码信号增强幅度在20 dB以内时,可以明显提升增强信号的抗干扰性能,引起其他信号等效载噪比恶化量小于2 dB;信号增强幅度超过20 dB后,将导致其他信号质量迅速下降,功率增强信号等效载噪比达到某一极值后将不再增加.The GPS modernization program plans to add M-code navigation signals which have the feature of beam power enhancement in the frequencies of L1 and L2. Taking GPS L1 M- code signal as example, the received signal quality, affected by power-enhanced signal from the aspects of spectral overlap as well as equivalent carrier-to-noise ratio of the received signals, is analyzed. Simulation results show that when GPS L1 M-code signal enhancement is within the range of 20 dB, the anti-jamming performance of power-enhanced signal will be improved significantly and the equivalent carrier-to-noise ratio of non-power-enhanced signal drops less than 2 dB. When the signal enhancement range surpasses 20dB, the quality of non-power-enhanced signal will drop rapidly attributing to the interference from power-enhanced signal. While, when keep on increasing the signal power, the value of equivalent carrier-to-noise ratio of power-enhanced signal will no longer increase after having reached certain extreme value.

关 键 词：GPS 导航 功率增强 抗干扰 

分 类 号：TN967.1[电子电信—信号与信息处理] TN911.7[电子电信—信息与通信工程]