A study on the GPS data quality and inspective indexes of GPS receivers

• Main Authors: Fu-Li Tsai, 蔡福利
• Other Authors: Chun-Sung Chen
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/4229sk

碩士 === 國立交通大學 === 土木工程系所 === 92 === For discussing the relation between the data quality and the precision of the baseline. In this project , five indexes are chosen for discussing GPS data quality. They are clock offset, clock stability, multipath on L1, multipath on L2 and observations by cycle slips (o/slips). For reducing common errors, six types of GPS receivers are chosen and set up at Ultra-Short Distance Network of NML (National Measurement Laboratory, Taiwan) during three days. The first three indicators are calculated by Teqc software and the last two indicators are solved by Bernese software. Moreover, the observations of three GPS tracking stations are obtained through internet, short baseline (about 25 km), middle baseline (about 150 km) and long baseline (around 2000 km) are processed by Bernese software. We found that clock stability and o/slips were very important factors for the positioning. Clock offset and multipath effects would not be the critical factors to influence the GPS results. We hope the information is helpful for GPS users when they decide to purchase any GPS receiver and to process GPS data.