A system of coordinates in which a point is located by its distance and direction (Angle) from a fixed point on a reference line (called the polar axis).
一种用点离基准线上(称极轴)固定点的距离和方向(角度)来表示点位置的坐标系统。
There were two main part of error source, the local reference system which was about 0.15as and the measurement coordinates of objects which were about 0.45as.
详细分析了主要的误差来源，分别是由参考星决定的局部参考架的误差约0.15角秒，目标量度坐标误差约为0.45角秒。
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