摘要
提出了采用全数字超前-滞后环路实现伪码相位跟踪和全数字叉积自动频率+考斯特斯环路实现载波频率/相位跟踪的技术方案。文中建立了环路的数学模型,分析了多普勒频偏、伪码相位差、信号载噪比和环路带宽对跟踪性能的影响。基于环路噪声和输入信号动态性,文中推导了跟踪环的最佳等效带宽。
A digital early-late tracking loop for PN code synchronization tracking and a AFC＋Costas tracking loop for carrier signal synchronization tracking are presented. The mathematics mode of DLL, FLL and PLL is derived, and the effect of Doppler frequency shift, PN phase error, signal-noise ration and loop equivalent bandwidth on tracking performance is analyzed. With consideration of loop noise and signal inputted dynamics, an expression of optimal loop bandwidth of synchronization tracking system is derived.
出处
《弹箭与制导学报》
CSCD
北大核心
2008年第1期269-272,276,共5页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
扩频接收机
伪码跟踪
载波跟踪
环路滤波器
spread spectrum receiver
PN tracking loop
carrier tracking loop
loop filter
