Precision analysis of iGPS measurement field and its application

To support the layout optimazation and system selection of an iGPS measurement system in the assembly of large complex products in aviation, aerospace, shipbuilding and other industries, and improve the measuement efficiency and precision, the characteristics of its measurement precision is studied. This paper presents a method for the precision analysis and the transmitter layout optimization of an iGPS measurement system. First, the working principle of the iGPS measurement system is investigated, and a simulation system model is constructed. The concepts of the iGPS measurement unit and measurement network are discussed, and a precision analysis method of the iGPS measurement field is studied. A case study is carried out for analyzing the quantitative relationship between the measurement precision of an iGPS measurement field and its transmitter layout. The results indicate that, when the distance between the transmitters is 20 m, the vertical fluctuations of measurement precision is less than 0.01 mm, and the horizontal measurement precision is linear, the maximum value of measurement precision is 0.12 mm, which appears in the center of the measurement field, while the minimum value of measurement precision is 0.25 mm, which occurs in the boundary of the measurement field. Finally, a precision constraint based measuring schema evaluation method and its implementation is developed to support the selection and industrial application of the iGPS measurement system.