Pictured above is a series of images digitally stacked so that all of the stars images coincide. Here, Mars appears to trace out a loop in the sky.
上面图是一系列数码照片叠加而成的，让恒星重合，而火星貌似在天空中画了一个环。
The design of code loop is the key point in the ranging system. And the choice of its parameter greatly affect the trace curve.
码跟踪环的设计是伪码测距系统的一个关键环节，其参数的选择对环路跟踪曲线影响很大。
The phase- locked loop is one kind of control system which is able to achieve phase automatic lock, to compose frequency and to trace demodulation system.
锁相环路是一种能实现相位自动锁定的控制系统，主要用于频率合成及跟踪解调系统。
There are lots of pole configuration algorithms which can guarantee the stability of closed loop system, but the algorithm have not optimal trace for lack of optimal strategy.
已有的极点配置算法对离散时间系统在保证闭环系统的稳定性方面是有效的，但由于算法采用的不是优化策略，因而对任意的有界参考输出不具有最优跟踪性能。
Basing on the grinding force trace control, this system realizes twin close-loop controls of grinding force and machine tool.
系统以磨削力跟踪控制为基础，实现磨削力和机床双闭环控制。
The research of a practical DDC system is presented. It's achieved to trace the target curve by feedback loop system with fixed feedback value.
介绍了某辗环机数字控制系统的研制，提出了采用定值反馈闭环控制方法跟踪目标值曲线。
The research of a practical DDC system is presented. It's achieved to trace the target curve by feedback loop system with fixed feedback value.
介绍了某辗环机数字控制系统的研制，提出了采用定值反馈闭环控制方法跟踪目标值曲线。
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