一种改进的功率比值法载噪比估算算法  

Improved power ratio method of carrier-to-noise ratio estimation algorithm

作　　者：傅金琳[1,2] 赵子阳[2] 李醒飞[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]天津航海仪器研究所,天津300131

出　　处：《中国惯性技术学报》2015年第5期642-647,共6页Journal of Chinese Inertial Technology

基　　金：船舶预研支撑技术基金项目(14JZ3.9.2)

摘　　要：针对GPS载噪比估算方法功率比值法中出现的导航电文翻转敏感问题,提出改进算法。改进算法根据对I路符号判决结果对导航数据位进行预测,基于预测结果消除载噪比估算中导航电文的影响,达到消除导航电文翻转影响的效果。理论计算分析证明该算法能够提高载噪比的估算精度,提升载噪比的更新率,从而提升系统的灵敏度与稳定性。分别对改进算法载噪比估算精度、抵抗导航电文翻转能力、M取值、载噪比更新率等几个方面进行了仿真验证,证明理论分析的正确性。In view that the power ratio method in carrier-to-noise ratio（CNR） estimation is sensitive to navigation data transition,an improved algorithm is proposed to solve this problem. In this improved algorithm,the navigation data are predicted according to the judgement of the path I＇s sign,then the effects of navigation on CNR estimation are eliminated based on these predicted results,which makes it immune from the effects of the navigation data transition. Theoretical analysis is made on the proposed algorithm,which demonstrates that it can improve the CNR estimation accuracy and increase the update rate,therefore improving the system sensitivity and stabilization. Simulations are made on the estimation accuracy of the improved algorithm,the ability to resist the navigation data transition,the value of M,and the update rate of CNR,and the results verify the conclusions of the theoretical analysis.

关 键 词：功率比值法 导航电文翻转 载噪比 更新率 

分 类 号：U666.1[交通运输工程—船舶及航道工程]