[[alternative]]The Analysis of Capture Area of Nonlinear Three-Dimensional Guidance Laws Using Phase Plane Method in Modified Polar Coordinate

[[abstract]]本文提出三維空間導引律通式，並利用相位法在修正的極座標下成功的分析其相關之目標物捕捉條件。一般在導引律方面之論文皆需假設小量瞄準誤差，或其結果僅能適用於二維空間之情況，然本文所提方法則無此限制。本方法可直接推展至目標物逃逸，但無法得知其加速度時，其捕捉條件之分析。另外對系統可觀性亦做了所需充分條件之探討。[[abstract]]In this paper, we presents the general three-dimensional guidance law. With the aid of the modified polar coordinate, the expression of relative dynamics between target and missile becomes simple, and the constructed guidance law is intuitive and naive. Furthermore, a phase plane method is used to analyze the capture condition of the corresponding guidance law. The result is not restricted to time -invariant navigation constant. For a nonmaneuvering target or a maneuvering target but with known acceleration, it can be seen that only two of the state vectors are related to the intercept condition. The corresponding observability is also examined.[[conferencetype]]國內[[conferencedate]]19991204~19991204[[iscallforpapers]]Y[[conferencelocation]]桃園, 臺