摘要
在分析常用的四参数曲面模型等区域对流层延迟模型的基础上,提出了一种新的基于多面函数的对流层拟合模型,并利用自编软件分析了各模型的拟合效果。将对流层拟合模型应用于改进的PPP定位算法,结果表明,所提方法能有效地提高初始历元的解算精度,收敛后定位结果与采用随机游走估计对流层湿延迟方法的结果精度相当。该方法可在一两个历元中使PPP收敛至dm级,但是对PPP收敛至cm级的效率提高并不明显。
Based on the analysis of common regional troposphere surface models such as four-parameter surface model and a curve model,we propose a new kind of regional troposphere delay model based on multi-faceted functions.We use our zero-difference troposphere estimate software to process the CORS data of one province to analyze results of various types of model.The experimental results show that multi-faceted function model fitting residual RMS of the troposphere is about ±6 mm,and the convergence in the initial stage is much smaller than four-parameter surface model,greater stability between the epoch,there is no significant ups and downs,to better describe the regional troposphere.At the same time,we use different troposphere solutions to get PPP results,the two ways are random walk and model fitting.The experimental results indicate that model fit method can reduce the number of unknown parameters,and enhance strength and stability,which will improve the accuracy of the initial epochs.The accuracies of positioning after the convergence are with considerable accuracy.This new method can help to get dm-level PPP results quickly,but it doesn′t have obvious effect for improving the speed of convergence to cm-level.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2012年第9期1024-1027,共4页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(41174012
41021061
40904007)
国家863计划资助项目(2012AA12A202)
中央高校基本科研业务费专项资金资助项目
