摘要
针对浮点与普通定点环路控制在运算量和资源占用方面的问题,基于对卫星导航接收机传统信号跟踪方法及精度的研究,提出了一种改进的定点环路控制方法,并分别从鉴相器量化误差、滤波器系数近似以及滤波器运算误差3方面,对其相对于浮点环路控制的跟踪精度损失进行了理论分析和实测验证.实测结果验证了误差分析的正确性.
Based on the investigation of traditional signal tracking method and accuracy,an improved fixed-point loop control method is proposed to optimize the computation load and resource usage. The theoretical analysis and actual test of the tracking accuracy loss in comparison to ideal loop control is presented from three aspects：quantization error of discriminator,approximation of filter coefficient and computing error of filter. Addition and shift are two main operations of the method. It is obvious that the proposed method can operate easily in real-time with low resources usage and small accuracy loss. The results have verified the correctness of error analyses.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第6期707-712,共6页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金重大资助项目(60890073)
关键词
环路控制
定点
锁相环
码环
loop control
fixed-point
phase locked loop（PLL）
delay locked loop （DLL）
