科技文献选读_The performance of RTK-GPS for surveying under challenging environmental conditions

1、The performance of RTK-GPS f o r s u r v e y i n g u n d e r challenging environmental conditionsName： FID：Major：GeomaticsEngineeringDecumentsSCI：GPS WorldCartography and geographic information scienceInternational Journal of Remote SensingJournal of Geodesy Earth Planets & SpaceSurvey ReviewEI：

2、测绘学报武汉大学学报中国矿业大学学报全球定位系统世界制图学和地理信息科学国际遥感杂志 大地测量学杂志地球行星空间测绘评论3Lee I S, Ge L. The performance of RTK-GPS for surveying under challenging environmental conditionsJ. Earth Planets & Space, 2006, 58(5):515-522.The performance of RTK-GPS for surveying under challenging environmental conditionsContents

3、AbstractIntroductionBodyConclusionAbstractThe aim of this paper was to assess the availability of RTK GPS (Real-Time Kinematic Global Positioning Systems) under some challenging environmental conditions. Testing was performed under two of these conditions, i.e. a small tree-covered garden and a pylo

4、n for high-voltage electricity supply. The increase in the number of satellites had many benefits for the integer ambiguity resolution, but no significant contribution to the accuracy of RTK positions and PDOP (Precision Dilution of Position). The results of RTK testing were compared against results

5、 from Total Station surveying as a further quality check. The results indicate that integrating RTK GPS system with Total Station is favoured for surveying in urban environments.Precision Dilution of Position 位置精度因子1. IntroductionGlobal Positioning Systems (GPS) have become more and more important f

6、or Earth science (e.g. disaster monitoring), geodesy, land surveying, cadastral surveying and maritime surveying, etc. But unfortunately, on their own, they do not guarantee the centimeter level of accuracy (Martin et al., 2000).This paper focuses on assessing the availability of RTK GPS for Earth s

7、cience under some challenging environmental conditions.Body2. Earth Surveying MethodsRTK-GPSBody2. Earth Surveying MethodsTotal Station surveying (TS)Case Study 1At a GardenIn order to assess RTK GPS under various environmental conditions, a test site was surveyed twice, once in the winter and once

8、in the spring. In the winter, trees were naked of their leaves and in the spring, full of green foliage.10the rate of fixed solution and float solution of (carrier phase) integer ambiguity was investigated to check the quality of RTK measurements. The flags in Fig. 4(b) show that positions have fixe

9、d solutions of integer ambiguity. But in Fig. 4(a), it is hard to find a flag. AnalysisRTK1 in winterRTK2 in spring At this stage, garden maps of a test site made by TS and RTK system were shown in Fig. 8 and 9. The garden map obtained from TS was used as ground truth to assess the accuracy of RTK p

10、ositions in environmental conditions.Case Study 2At an Electric Power PylonIn order to assess RTK GPS under various environmental conditions, a test site was surveyed twice, once in the winter and once in the spring. 13Table 4 contains the local Cartesian coordinates obtained from RTK, a static GPS,

11、 and TS surveying.AnalysisTable 5 shows the coordinate differences in horizontal components between RTK, a static GPS, and TS surveying.5. ConclusionsThis paper dealt with the performance assessment of RTK GPS at small garden under the urban environments, in two different seasons, and underneath the

12、 electric power pylon surrounded by tree canopy. In addition, Total Station surveying as ground truth was conducted at the same time.In Case study 1, the analysis of result showed thatIn Case study 2, The two case studies highlighted the weakness of RTKGPS due to e.g. the blockage of satellite signals near