国防科技大学学报2012，Vol.34Issue(1)：127-131,5.
振荡器相位噪声对GNSS接收机载波跟踪数字锁相环性能的影响
Impact of oscillator phase noise on carrier DPLL tracking performance in GNSS receiver
摘要
Abstract
Present analytical conclusion of GNSS carrier tracking digital phase-locked loop (DPLL) phase jitter due to oscillator phase noise is derived based on the linear model of analog PLL. It is, however, not able to reveal the relationship between phase jitter and the coherent integration time (CIT) , and it cannot guide the high sensitivity and high precision carrier tracking DPLL parameter design effectively. Firstly, this research derived the power spectral density of white frequency and random walk frequency phase noise sequences output from the phase detector. Secondly, the formulae of phase jitter were obtained based on the DPLL linear model and verified by simulation. Finally, analytical and numerical analysis on the obtained phase jitter formulae was carried out. The analysis results show that, both of DPLL phase jitter due to white and random walk frequency noise increase as the CIT grows, and decrease firstly and then increase as the loop bandwidth grows. The phase jitter formulae and the conclusions, which describe the relationship between DPLL phase jitter and the loop bandwidth and the CIT, can be used as guideline for GNSS carrier tracking DPLL parameter design.关键词
数字锁相环/相位噪声/相位抖动/相干积累时间/GNSS接收机Key words
digital phase-locked loop/ phase noise/ phase jitter/ coherent integration time/ GNSS receiver分类
信息技术与安全科学引用本文复制引用
吴向宇,龚航,朱祥维,欧钢..振荡器相位噪声对GNSS接收机载波跟踪数字锁相环性能的影响[J].国防科技大学学报,2012,34(1):127-131,5.基金项目
教育部新世纪人才支持计划资助项目(NCET-08-0144) （NCET-08-0144）
