Positioning Accuracy Analysis of GPS Network RTK in Southern Taiwan

• Main Authors: Ching-Jung Wu, 吳清瀜
• Other Authors: Ruey-Juin Rau
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/11580331994482210469

碩士 === 國立成功大學 === 地球科學系專班 === 95 === The advantage of GPS RTK positioning technique is the high-accuracy in positioning and fast surveying without post-processing. But it has disadvantage that when the distance between the reference station and the rover station increases, the systematic errors of ionosphere, troposphere, and orbit may affect the accuracy of positioning. The rover is usually required to locate within about 10 kilometers of the reference station, in order to acquire the centimeter-level accuracy. The study used southern Taiwan as the test area for VRS-RTK analysis. There are total ten continuous GPS stations for the analysis; three are part of the Land Survey Bureau eGPS network and eight (GS28-GS35) are from the Central Geological Survey. The observation data (one data per 30sec) on the 276th day in the Year 2006 is used. Comparing VRS-RTK with traditional single station RTK; VRS-RTK results are less affected by the atmosphere factor, however the test results show that a maximum station interval of 34 kilometers revealing the horizontal positioning accuracy within 3 cm, and within 4.5 cm for the height component and the success rate reaches 99％,the area of the covered field can reach to 550 kilometer square. Besides the size of the network, the range for successful VRS-RTK positioning outside the network is about 6 ~ 7 kilometer. Comparing the positioning accuracy, success rate and PDOP numbers of all networks show that the PDOP numbers do not seem to affect the positioning accuracy.