【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(ZCDPLL)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.更多还原

【Abstract】 A novel digital phase tracking and measuring loop(DPTML) appropriate for distan ce measurement are proposed and analyzed using the theory of finite Markov chain s.The performa nc e of steady state phase tracking error and phase acquisition time in the prese nce 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 stat e results to ulteriorly reduce the tracking error is also presented.Both the cal culated and simulated results indicate that the DPTML has much less steady sta te error than traditional zero crossing digital phase locking loop(ZC DPLL).Add itionally,because the “hangup” effect leading to prolonged phase transients owing to the presence of the dead zone around π rad is thoroughly eliminated,the phase acquisition time of the DPTML is much shorter than the latter,especially i n high SNR.更多还原