摘要
电离层延迟多频修正算法在修正电离层延迟的同时会放大观测噪声等伪距误差的影响。分析了电离层延迟双频修正、三频一阶修正和三频二阶修正三种修正算法及观测噪声的影响。以Galileo系统的四个载波频率为例,对不同频率组合下三种修正算法进行了比较。结果表明电离层延迟多频修正中,并不是观测量的频点数越多或修正掉的高阶项越多修正精度越高,还与观测伪距噪声的大小以及采用的修正方法有关。为多频测距系统的电离层延迟修正算法和最佳频率组合设计提供了一种可行的分析方法。
Pseudorange en＇ors such as observe-noise etc are magnified when the ionospheric en＇or in ionospheric delay＇s correction is weakened. Three muhi-frequency correction algorithms such as dual-frequency, triple-frequency of one onler and triple-frequency of two orders are discussed. Taking the four carrier frequencies of Galileo as an example, three algorithms＇ with different frequencies＇ combinations are eompared. The result indicates that precision of multi-frequency correction not only depends on frequency numbers observed or high orders items corrected, but also hase relation to noise magnitude and correcting method selected. The study offers a feasible analytical method for muhi-frequency ranging systems in ionospheric delay＇s correction and optimal frequency combinations＇ design.
出处
《测绘科学》
CSCD
北大核心
2008年第4期58-60,共3页
Science of Surveying and Mapping
基金
新世纪优秀人才支持计划(NCET-04-0995)
