摘要
对流层折射误差是影响雷达测量定位系统精度的主要因素之一。针对VMF1(Vienna Mapping Function 1)用于对流层折射误差修正时存在的实时性差、分辨率低的问题,引入GPT2w模型并提供分辨率为1°×1°的相关参数,结合Saastamoinen模型构建形成SG-VMF1模型。基于新模型和映射函数法的计算原理,对4个IGS(International GNSS Service)测站在不同高度角时的对流层折射误差进行估算,并与射线描迹法的计算结果进行对比分析。结果显示:以结合IGS实测气象数据的射线描迹法的计算结果为基准时,利用SG-VMF1模型及相关理论计算的结果在高度角大于6°时RMS值可达到0. 4 m,在高度角大于30°时RMS值可达到0. 1m,计算方法可行有效,且具有实时性和较高的分辨率。
Tropospheric refraction error is one of the main factors that affect the accuracy of radar measurement and positioning system.In view of the poor real-time and low resolution of the Vienna Mapping Function 1(VMF1)in refraction error correction,this paper introduces the GPT2w model that can provide some relevant parameters with a resolution of 1°×1°,and build a new model that named as SG-VMF1 by combining with the Saastamoinen model.Based on the new model and the calculation principle of the mapping function method,the tropospheric refraction error values of 4 International GNSS Service(IGS)stations at different elevation angles are estimated.The results demonstrate that when taking the results calculated by ray-tracing method based on IGS meteorological data as a reference,the RMS with the result of SG-VMF1 model and relevant calculation theory can reach 0.4 m when the elevation angle is 6°,and the RMS can reach 0.1 m when the elevation angle is greater than 30°.The new calculation method is feasible and effective,and with real-time and higher resolution.
作者
乔江
杜晓燕
卫佩佩
Qiao Jiang;Du Xiaoyan;Wei Peipei(Institute of Information Systems Engineering,Information Engineering University,Zhengzhou 450001,China;School of Information Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2018年第10期58-63,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(61271104)
