Research On Angle Measurement Uncertainty And Compensation Method Of Indoor Measurement Positioning System

Large-scale engineering metrology is one of the basic supporting technique in large-scale manufacture and precision engineering installation,which is also a hot and difficult problem in precision measurement technology.With the rapid development of current foundational equipment manufacturing,large-scale engineering metrology become more important. So indoor workspace measurement positioning system(wMPS) is developed with distributed network architecture which is made up of transmitters and independent receivers. It's designed for measuring the large scale products of industries with high real-time and better concurrency. Moreover, accuracy and large measuring space can be balanced by increasing transmitters. The calibration and traceability of measurement system are required. However, researches on angular error and its synthesis and transfer are lacked. In addition, researches on verification and compensation of wMPS are lacked. All of those restrict software design and application of the system.This paper is focus on angle measurement uncertainty and compensation method of the indoor measurement positioning system. The main work is as follow:1. Theoretical definition of metrology process models of wMPS was described and uncertainties were propagated from internal parameters using Monte Carlo simulation. Furthermore, error propagation model from angular error to coordinate error was proposed and muti-transimitter coordinate error was discussed based on angular error of single transmitter.2. The horizontal angle calibration platform was designed on the basis of verification system for theodolite. And then, coaxial adjustment mechanism was designed to adjust the two rotation axes of transmitter head of wMPS and dividing table. Meanwhile, data analysis method and process of horizontal angle calibration were proposed. Finally, horizontal angle uncertainty was measured in the working space based on designed platform.3. Based on mathematical model analysis and error analysis of calibration, global control network was constructed in the workbench and error compensation method was proposed for calibration error in order to improve measurement accuracy. Meanwhile, real-time compensation method for measurement points was discussed based on the control network. And then, the princeple of compensation method based on least-squares fitting was outlined to compensate the error caused by calibration platform.4. wMPS is a multi-station system with transmitters, receivers and control network distributed in the measuring space. The architecture, sub-modules, measurement principle and calibration method were studied. Meanwhile, the data management and software design under distributed architecture were discussed.