Based on instances, the paper analyses the time conflict of PLC system caused by exterior timer, and provides the solution to the problem.
以工程实例为基础，对使用外部定时器时给P LC系统带来的时间竞争问题进行分析，并提出解决措施。
The robust precise formation keeping of the DSS was realized based on the control law, and the conflict between control time and control precision was conquered using the control law.
提出了基于切换增益衰减因子的变切换增益变结构控制律，实现了高精度的分布式卫星构型保持鲁棒控制，较好地克服了误差收敛时间和控制精度的矛盾；
The robust precise formation keeping of the DSS was realized based on the control law, and the conflict between control time and control precision was conquered using the control law.
提出了基于切换增益衰减因子的变切换增益变结构控制律，实现了高精度的分布式卫星构型保持鲁棒控制，较好地克服了误差收敛时间和控制精度的矛盾；
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