A method for improving the performance of centering rod surveying based on two-position correction

Abstract

Aiming at the problem that accelerometer’s bias and scale factor error decrease the measurement accuracy of centering rod surveying, a performance improving method for pitch measurement is proposed. The error model of centering rod surveying is built so that the relationship between pitch measurement error and accelerometer’s bias and scale factor error are clear. Numerical simulations are conduced out and the error variation is revealed. A two-position correction method is come up and twelve verification experiments are carried out. After correction, the measurement error is reduced from a few centimeters to submillimeter scale. Experimental results illustrate that the accuracy of pitch measurement is improved effectively, which meets the requirements for use. Three repeated experiments are carried out, the calculated uncertainties are 0.053 %, 0.035 % and 0.027 % separately, which indicates the feasibility and effectiveness of the proposed method in practical applications. It can provide some guidance for improving the performance of centering rod surveying.

Modeling and Compensation of Inertial Sensor Errors in Measurement Systems

“…In addition, the IMU can assist RTK measurements by increasing the speed of aligning the bubble to the level of the centering pod in traditional measurement [17]. In [18], a method was proposed to rectify the reduction in the measurement accuracy of the tilt of the centering rod caused by the bias and scale factor error of the accelerometer. A model for the measurement error of the centering rod was established that related the pitch measurement error and the two aforementioned fixed errors of the accelerometer.…”