The conditions for the existence of periodical solutions, and the estimation of the perimeter and relative position of the limit cycles are obtained.
证明了周期解的存在条件，并估计了有关极限环的周长和相对位置。
A filter design for rendezvous and docking with non-cooperative target was also given which can provide estimation information of relative position, velocity, attitude Angle and angular rate.
设计了针对空间非合作目标对接段的滤波器，能够提供对接段相对位置、速度、姿态角及角速率估计信息。
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