消去GPS相位模稜OTF相對定位之研究

• Main Author: 黃昭銘
• Other Authors: 吳究
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/30199996459258644206

碩士 === 國立中央大學 === 土木工程研究所 === 89 === Integer ambiguity parameters are very important, yet unknown variables when using GPS carrier phases for ranging and positioning. Theoretically, it is equivalent to either eliminate the integer ambiguities or to estimate them. The use of cosine functions to eliminate any integer ambiguities in relative positioning applications causes spatial ambiguity problems to arise, but both reasonably approximated positions and wavelength-dependent convergence ranges are of the utmost importance. Differential GPS-based position solutions are smoothed to create an initial time-varying trend trajectory. Long-wavelength wide-lane phase combinations are utilized to facilitate positional convergence, on a stage-by-stage basis. Although as by-products, all the double-difference ionospheric path delays will be obtained, when, finally, the respective cosines of the L1 and L2 carrier phases undergo a simultaneous least-squares estimation. In particular, the quadratic forms of the estimated phase residuals are linked with statistical testing to allow for a meaningful inference. Some low-dynamics experiments prove the feasibility of the hierarchical positioning concept.