自然坐标 meaning in English

natural coordinates

Hence , the problems concerning the expression of position vector in the global coordinate system and the local coordinate system , and the numerical area integration by the natural coordinates were solved thoroughly
这样，完善地解决了单元中任意点在整体坐标与局部坐标的表示问题和基于局部自然坐标的面积分和体积分的数值积分的依据问题。
Fourth , a new driver preview trajectory strategy assumption based on nature coordinate system is suggested . the concept of lateral preview yaw is presented . a new handling control model of the driver ? steering command decision based on the lateral preview yaw is also put forward
第四，提出了在自然坐标下的驾驶员前视预瞄轨迹的预瞄策略，给出了横向预瞄偏差的概念，建立了基于横向预瞄偏差的驾驶员前视轨迹控制模型。