【摘要】 映射函数是对流层延迟改正中的重要组成部分,是将天顶方向延迟量准确转化为信号传播路径方向的关键。选择一个合适的映射函数对于提高数据处理的精度具有十分重要的意义。分别选取了山东地区的90个左右CORS站点及周边的6个IGS站(BJFS、 CHAN、 CHAO、 WUHN、 SUWN、 DAEJ)的2012年1、 4、 7和10月份的各7天的数据,通过对比在不同高度角下3种映射函数的解算精度,分析了GMF、 NMF、 VMF1三种映射函数在山东地区对GPS定位精度及可降水量解算精度的影响。结果表明,在处理山东地区的GPS数据时,当卫星高度角小于15°时,GMF的解算精度略优于其他两者,但3种映射函数的解算精度差别不大;当高度角大于15°时,使用NMF得到的结果的精度略优于其他两者;同时还发现高度角为10°时解算精度最好并且随着高度角的增加,3种映射函数的解算精度也随之变差;因此,在高精度数据处理时,建议将卫星高度角设置为10°,并使用GMF映射函数。更多还原

【Abstract】 The mapping function as an important part of tropospheric delay correction is one of the keys to map the zenith delay into the signal propagation path accurately. Selecting a suitable mapping function has great significance for data processing. Some CORS data and some surrounding IGS data were used to analyze the influence of the tropospheric mapping function on GPS data processing and estimating PWV(precipitable water vapor)over Shandong. When the cut-off satellite elevation angle is set to be less than 15 degrees, the solution accuracy of GMF is slightly better than that of the other two. When the elevation angle is greater than 15 degrees, the solution for using NMF is better than those using GMF and VMF1. It is also found that the solutions of three mapping functions become worse along with increasing elevation angle. In the high precision data processing, it is recommended that the cut-off elevation angle set to 10 degrees with the use of GMF.更多还原