摘要
针对复杂环境下,载波观测数据易频繁发生周跳的问题,分析周跳对定位影响的机理和程度:在全球卫星导航系统(GNSS)精密定位模型的基础上,分别推导周跳对定位实数解及定位整数解影响的计算公式;并从方差的角度,分析相应的精度损失;然后对人为加入不同类型周跳的观测数据进行定位解算,分析这些周跳对模糊度、定位结果的影响规律。实验结果表明:周跳的发生会导致模糊度不能被固定,且发生的周跳越大,模糊度被重新固定所需的时间越长;连续周跳对定位的影响程度将会叠加,模糊度被重新固定所需的历元个数将会增多;由于模糊度不能固定以及周跳的直接影响,定位误差会大幅度增加。
Aiming at the problem that it is liable to frequent cycle slips for carrier observation under complex environments,the paper analyzed the impact mechanism and degree of cycle slips on positioning:based on the precision positioning model of Global Navigation Satellite System(GNSS),the calculation formulas of the cycle slip effect on the positioning real solution and positioning integer solution were derived respectively;and the corresponding accuracy loss was analyzed from the perspective of variance;then the observation artificially adding different types of cycle slips was located and calculated;finally the impact rules of these cycle slips on ambiguity and positioning were analyzed.Experimental result showed that:the occurrence of cycle slips would cause the ambiguity not to be fixed,and the greater the cycle slip is,the longer it takes for the ambiguity to be re-fixed;the effect of continuous cycle slips on positioning would be superimposed,and the number of epochs required for re-fixing the ambiguity would increase;moreover,due to the ambiguity not to be fixed and the direct effect of cycle slips,the positioning error could increase significantly.
作者
夏思琦
于先文
XIA Siqi;YU Xianwen(School of Transportation,Southeast University,Nanjing 211189,China)
出处
《导航定位学报》
CSCD
2020年第6期82-87,共6页
Journal of Navigation and Positioning
基金
国家自然科学基金项目(41974030,41674035)。
关键词
全球卫星导航系统
周跳
精密定位
精度损失
影响规律
global navigation satellite system
cycle slip
precise positioning
loss of accuracy
rule of influence
