摘要
本文介绍了一种新型数字相位跟踪测量环(DPTML)结构，并应用有限状态Markov链理论求解 其稳态 误差和响应时间.通过分析关键部件的抗噪声性能给出了参数选择依据，提出了应用稳态结 果进一步降低输出误差的“稳态平均法”.计算和仿真结果均表明，该DPTML比传统的过零采 样数字锁相环(ZCDPLL)具有更强的抗噪声性能，并有效消除了高信噪比下的“hangup”效 应，缩短了响应时间，更适于测距应用.
A novel digital phase-tracking and measuring loop (DPTML) appropriate for distance measurement are proposed and analyzed using the theory of finite Markov chains. The performance of steady-state phase-tracking error and phase acquisition time in the presence of additive band-limited white Gaussian noise are evaluated. By analysis of the noise-resistant characteristic of the key module, guidelines on selection of its pivotal parameter are given. A new method utilizing the acquired steady-state results to ulteriorly reduce the tracking error is also presented. Both the calculated and simulated results indicate that the DPTML has much less steady-state error than traditional zero-crossing digital phase-locking loop (ZC-DPLL). Additionally, because the hangup effect π is thoroughly eliminated, the phase acquisition time of the DPTML is much shorter than the latter, especially in high SNR.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2001年第9期1168-1172,共5页
Acta Electronica Sinica
基金
国家"八六三"基金(No.863-317-03-01-15-99)
关键词
测距
相位测量
数字相位跟踪测量环
信噪比
Calculations
Computer simulation
Distance measurement
Error analysis
Gaussian noise (electronic)
Phase locked loops
Phase measurement
Signal to noise ratio
Tracking (position)
White noise
