【作者】 王赟； 袁嗣杰； 杨君；

【Author】 Wang Yun~1,Yuan Sijie~2,Yang Jun~1 (1.Department of Postgraduate,the Academy of Equipment Command & Technology,Beijing 101416,China; 2.Department of Optical and Electronic Equipment,the Academy of Equipment Command & Technology,Beijing 101416, China)

【机构】 装备指挥技术学院研究生院； 装备指挥技术学院光电装备系；

【摘要】 为了解决当前数字综合基带设备在高动态多普勒条件下载波捕获跟踪误差较大的问题,需要认真分析数字锁相环在非线性状态时的捕获性能。本文通过导数逼近法将模拟域相图法转换到数字域,得到了数字锁相环的快捕带理论公式以及采样率、自然谐振频率、快捕时间、稳态相差之间的关系,可以用于指导数字锁相环及软件锁相环的设计与仿真。更多还原

【Abstract】 In order to solve the problem that digital synthetical baseband devices has a relatively great error when operating carrier capturing and tracking in high dynamic doppler situation,it’s necessary to analyze the capture performance seriously as the digital Phase-locked Loop(PLL) is in the state of non-linear.This paper transformed the phase plain approach in analog domain to numeric domain,gives out the results about the theoretic expression of digital PLL’s fast capture frequency range as well as the relations between the sampling rate、natural frequency、fast capture duration and steady-state phase error,which can be used to direct the design and simulation of digital PLL or software PLL.更多还原