Accuracy estimation and its accuracy optimized research on two linear intersection points

This article analyses the calculation problems concerning mean square error of side length, mean square error of starting point and triangle figure condition which will affect comprehensively error of intersection point, especially linear intersection minor angle triangle´s intersection angle between 150° ~ 180° intersection point´s error optimization and the optimum solution of point transfer coordinate. According to the conclusion that intersection angle´s error is smallest at 90° intersection point, the author puts forward a method, namely, increase point transfer, and study point transfer and the first optimization of the known linear two points as well as point transfer and the second optimization of the known point with intersection point, and reaches the highest intersection point. In this way, the author infers the calculation mathematical model of optimum solution of intersection point coordinate and its position error. By analogue, it indicates that the accuracy improves remarkable if intersection angle is bigger than 150° intersection point´s accuracy, the error decreases from 26.422 mm to 1.778 mm,and the accuracy is very steady and seldom changes. We can even come to the conclusion that the closer intersection angle approaches 180°, the higher the accuracy of intersection point is.