CAJ | 학술논문

对于单频G PS用户而言，电离层延迟是最重要的误差来源之一。G PS系统使用Klobuchar模型对电离层延迟进行改正，其改正数从根据经验模型和历史数据得到的370组常数选取。在缺少全球观测数据的情况下，仅利用中国区域观测数据拟合电离层模型参数，存在区域外精度下降，参数超限等问题。针对这些问题，提出了利用经验模型外推进行参数拟合的方法。相比广播Klobuchar参数，在太阳活动高峰年RMS误差减小接近7 TECU ，正常年减小1.5 T EC U ，平静年精度也略有提升。2001年至2012年的拟合参数不存在参数超限现象，且量化后或者使用预报的电离层数据进行拟合，精度下降很小，可以用于预报全球电离层模型参数。
대우단빈G PS용호이언，전리층연지시최중요적오차래원지일。G PS계통사용Klobuchar모형대전리층연지진행개정，기개정수종근거경험모형화역사수거득도적370조상수선취。재결소전구관측수거적정황하，부이용중국구역관측수거의합전리층모형삼수，존재구역외정도하강，삼수초한등문제。침대저사문제，제출료이용경험모형외추진행삼수의합적방법。상비엄파Klobuchar삼수，재태양활동고봉년RMS오차감소접근7 TECU ，정상년감소1.5 T EC U ，평정년정도야략유제승。2001년지2012년적의합삼수불존재삼수초한현상，차양화후혹자사용예보적전리층수거진행의합，정도하강흔소，가이용우예보전구전리층모형삼수。
To GPS single-frequency user ,the ionosphere delay is one of the most impor-tant sources of errors .GPS uses Klobuchar model to correct the ionosphere delay w hose cor-rections come from 370 groups of constants derived from empirical models and historical da-ta .Under the circumstance of lacking of global measurement of ionosphere data ,we may use observational data in only Chinese area to fit the Klobuchar model parameters .But we will face with problems of precision depression out of Chinese area and ultralimit of parameters . This article focuses on these questions and comes up with methods of fitting parameters u-sing empirical model to extrapolate the data of Chinese area to the world .Compared with broadcasting parameters ,during Solar Max condition fitting parameters can reduce RMS er-ror about 7 TECU ,in general years this number is 1.5 TECU and during Solar Min condi-tion fitting parameters perform slightly better than broadcasting ones .From 2001 to 2012 , the phenomenon of ultra-limit didn’t occur and parameters after quantifying or fitted with forecasting data didn’t show obvious precision reduction ,showing the possibility of forecas-ting Klobuchar model parameters .