Abstract：The method of zenith path delay (ZPD) estimation based on precise point positioning (PPP) is introduced. Besides,the effect of various factors on ZPD estimation’s accuracy is analyzed from the view of mapping function selection, satellite cutoff elevation angle setting, the use of precise ephemeris and clock errors. Accordingly, relatively better mode and data processing strategy are determined. Large amount of experiments and analysis show that ZPD with relatively high accuracy can be obtained by use of both NMF and GMF, and the difference between them is little. Moreover, 5° -10° in the cutoff elevation angle is more favorable to ZPD estimation. In addition, the ZPD calculated with rapid precise ephemeris and clock errors or with predicted precise ephemeris and rapid precise clock errors are of the similar accuracy as that derived from post precise ephemeris and clock errors. However, accuracy of ZPD obtained by adopting extrapolated ultrarapid precise ephemeris and rapid clock errors slightly decreases but is still relatively high.
Yan Ziping,Lü Cuixian,He Xiyang et al. ESTIMATION OF ZENITH PATH DELAY BASED ON PPP AND ANALYSIS OF ITS INFLUENCE FACTOR[J]. jgg, 2011, 31(2): 107-110.
