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The error ellipse of joints in circular tunnel is deeply discussed.
对圆曲线贯通误差进行了深入的探讨。
To solve problems with error quadrilateral method is more objective and reasonable than with error ellipse method under same conditions.
分析了在同等条件下，用误差四边形解决问题比用误差椭圆等方法更客观，合理。
Moreover, there is still a large error area of probability ellipse, which makes the precise location cannot available.
而是存在一个不小的概率椭圆误差区域，因而无法精确确定被测目标的真实位置。
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