Research On Network Deployment Optimization Of Workspace Measurement And Positioning System

Compared with single-station coordinate measuring system, distributedlarge-scale coordinate measuring system has unparalleled advantages in flexibility,reliability, parallelism and range scalability, which makes it to be a strong technicalsupport to realize efficient and precision measurement in large-scale workspace.Distributed coordinate measuring system is a network measurement system. Thenetwork deployment of the stations has a significant impact on system positioningerrors and the number of stations will restrict the use of cost. In order to enhance themeasurement performance, reduce costs and provide guidance for station layoutdesign, optimization of the network structure is an important issue in the course of use.wMPS(workspace Measuring and Positioning System) is a new type of distributedcoordinate measurement system, the optimization of system network deployment isstudied in this paper, the main contents are as follows:1. The influence of station network deployment on system positioning error isanalysed and positioning error model is established of which the impact of angularrandom error is mainly analysed. Then a calibration method of validating themeasurement uncertainty of horizontal rotation angle is put forward based onwhich angle measuring performance of single-station is estimated. Throughcomparing the statistics result of repeatability errors of the measured points withthe analysis result of positioning error model, the reasonableness of positioningerror model is verified;2. Geometric model of wMPS one-way communication is established and the effectof station number on accuracy improvement is analysed. Aiming at the planefeature, typical layouts and error distribution of small network composed of two tofour stations are researched. In consideration of the receiver effective workingdistance limitations and the scanning dead zone of station laser planes, anoptimization method of typical layout spacing based on multi-objective constraintis presented in order to weigh the positioning accuracy and the effectivemeasurement area. Experimental results show that the typical layouts of fourstations have the highest whole measurement accuracy, but the typical layouts ofthree stations have more obvious effect to improve the accuracy of two-stationsystem; 3. Based on the analysis of wMPS characteristics and typical layouts, a globalnetwork optimization method is proposed. For the two key aspects of the globaloptimization process: region separation and choosing of the typical layout, thecoverage area estimation methods of typical layout is studied and typical layoutpositioning error model is set up through two-step polynomial least squares fitting.Then the global network optimization process is designed and a basic softwareplatform is built. Finally, the feasibility of global network optimization is verifiedthrough two field application examples.