A Downhole Closed Traverse Coordinate Measurement Method

Abstract

The invention discloses an underground closed traverse coordinate measuring method. The method comprises the following steps: S1, a horizontal angle at a traverse point and a side length of the traverse are acquired; S2, an angle closing error is calculated, the closing error is reversely and equally distributed to each horizontal angle, and an angle adjusted value after correction is obtained; S3, according to the angle adjusted value after correction, a side azimuth angle of each traverse is calculated as an azimuth angle adjusted value; S4, a vertical and horizontal coordinate closing erroris calculated; S5, a coordinate condition equation and a normal equation are built through error theory analysis and a least square method principle; S6, according to the condition equation and the normal equation in the fifth step, correction for a side length observation value and the side length adjusted value are solved; and S7, a coordinate increment is calculated according to the azimuth angle after angle adjustment and the side length adjusted value, and adjustment coordinates of each transverse point are thus calculated. The adjustment calculation method in the invention can be applied to closed traverses in different shapes, an adjustment model has nothing to do with measurement error parameters, and the purpose of improving coordinate solution result reliability is achieved.

Description

technical field [0001] The invention relates to downhole closed wire measurement technology, in particular to an downhole closed wire coordinate measurement method. Background technique [0002] The solution of downhole closed traverse coordinates usually adopts strict adjustment method or simple adjustment method, because the error parameter (or the weight of side length) of downhole traverse measurement is generally difficult to determine accurately, and the redundant observation number (or condition number) of closed traverse ) is less, which leads to a large deviation in the coordinate results of the strict adjustment method. However, the simple adjustment method artificially regards the coordinate increment as the observation value, so that the adjustment model has nothing to do with the shape of the traverse (that is, the azimuth angle of the traverse side), that is, regardless of the shape of the closed traverse, the coordinate closure error of the closed traverse is ...

AI Technical Summary

Problems solved by technology

But the existing closed traverse adjustment model cannot meet this requirement

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