Study on the Adjustment of GPS Receiver Clock Biases for Height Accuracy

• Main Authors: Yu-Jen Tu, 凃佑任
• Other Authors: Joz Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/34805126673483023693

碩士 === 國立中央大學 === 土木工程研究所 === 92 === At present, the GPS static positioning accuracy of horizontal is better then vertical. Average, vertical standard bias is 3 times for horizontal standard bias. GPS survey can’t application in vertical positioning occasions of height accuracy cause of theory error of vertical general have several centimeters upward. Height correlation between vertical parameter and time bias parameter in single difference. The behaviors of the relative positioning caused by the receiver clock bias as well as the effect from receiver clock bias in single difference model are described. For absolute correlation between ambiguity parameter and time bias parameter of carrier phase in single difference. Therefore to use several method to deal this problem like application of double difference ambiguity and use pseudorange to calculate time bias initial value. After ambiguity fixed, to use least square method calculate time bias in single difference. And through already calculate time bias of several epochs to estimate next epoch time bias. To goto a step further to analysis time bias for effect of positioning bias. In study, estimate mode performs by quadratic function.