Research On Transmitting Base Station Technology Of R-LATs Spatial Positioning System

With the rapid development of modern manufacturing equipment industry,there are higher and higher standards for large-scale measurement technology in the manufacture and assembly of large-scale equipment such as aircraft and ships.The measuring range of large-scale equipment reaches tens of meters or even hundreds of meters,so the traditional large-scale measuring equipment can not meet the requirements of the development of modern large-scale measurement technology because of its low measuring efficiency,small measuring range,single-point measurement and the need for manual aiming.At present,laser tracker and iGPS system are usually used to measure the space position of large-scale equipment such as aircraft and rocket in the process of assembling,but the technology of large-scale space positioning is basically monopolized by foreign countries.China has not yet developed large-scale space precision measurement equipment with independent intellectual property rights.Therefore,the large-scale space precision measurement system has become an important research content in the field of large-scale measurement in China.The R-LATs system proposed in this dissertation is a new large-scale space precision measurement system based on forward rendezvous principle.It has high measurement efficiency,high accuracy,wide measurement coverage,good scalability and parallel measurement ability,and provides a good basis for the development of large-scale space measurement equipment.In this dissertation,the key technologies of R-LATs system,such as its composition,measurement principle,measurement model,calibration technology of system parameters and accuracy analysis of characteristic angle,are studied.The main work of this dissertation is as follows:1)The measurement method of R-LATs spatial positioning system was studied.According to the measurement principle and composition of R-LATs system,single R-LAT measurement model and multiple R-LAT measurement model were established respectively.And the extraction process of feature time,the recognition of feature angle,the calculation method and the factors affecting the accuracy of the system were studied.2)The hardware system of the transmitter was designed.The radio power transmission system based on electromagnetic induction principle ensured the stability of power supply and transmission efficiency of sector laser,reduced physical friction,and improved the stability of transmitter rotation.The triggering accuracy of the reference signal is improved by designing the driving circuit of the ns-level reference light source.3)The calibration technology and error analysis technology of system parameters under a single measurement unit are studied.In view of the characteristics of the laser plane linewidth from width to narrowness and from narrowness to width,this dissertation proposed a unit calibration method and a multi-position calibration method.The experimental results showed that the length measurement error of the unit calibration method was less than 0.15 mm,and the result was better than that of the multi-position calibration method.Aiming at the influence of spindle rotation error on characteristic angle error,this dissertation established an error analysis model for the influence of spindle axial migration,radial runout and spindle swing on characteristic angle.The relationship between the characteristic angle error and the coordinates of the measured target points were simulated by using Matlab.The experimental verification of the influence of spindle swing on the characteristic angle was completed by the selection method.The experiment showed that the precision of the characteristic angle is higher when the assembly gap between the transmitter and the motor spindle is less than 0.015 mm.4)A prototype system of R-LATs was constructed.In terms of accuracy and repeatability,the measurement accuracy evaluation experiment of R-LATs system was carried out.The experimental results showed that the measurement error was better than 0.2 mm and the repetitive measurement accuracy was less than 0.05 mm in the measurement range of 15 m,which indicates that the R-LATs system studied in this dissertation has a high spatial measurement and positioning accuracy.