摘要
载噪比是GPS接收机中的一个重要测量值和控制参数。针对高灵敏度GPS接收机中的载噪比测量,提出了一种自适应载噪比估计算法。该算法根据信号功率的大小自适应调整载噪比估计时间来获得准确且稳定的载噪比估计值。该算法已经在GPS接收机中实用,测试结果表明,载噪比大于40dB-Hz时,估计时间小于1s,估计值的标准差小于0.2dB,随着载噪比的降低,估计时间呈指数关系增加,载噪比为14dB-Hz时,更新时间为12.48s,估计值的标准差小于0.8dB。
The carrier-to-noise density ratio is an important measurement and control parameter in GPS receivers. This paper proposes an adaptive C/N estimation method intended for high sensitivity GPS receivers. This method can stably and accurately estimate the C/N of the signal by adaptively adjusting the estimation time according to the signal strength. It has been used in GPS receivers. Testing results show that the estimation time is less than 1 s when C/N is above 40 dB-Hz. As the decreasing of the C/N, the estimation time increases exponentially. When C/N is 14 dB-Hz, the estimation time is 12.48 s and the standard deviation of C/N estimation is less than 0.SdB.
出处
《电子技术应用》
北大核心
2010年第6期111-114,共4页
Application of Electronic Technique
基金
国家高技术研究发展(863)计划基金资助项目(2007AA12Z344)
关键词
GPS接收机
弱信号
载噪比
自适应载噪比估计算法
GPS receiver
weak signal
carrier-to-noise density ratio
adaptive C/N estimation method
